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Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide

OL-5421-03

Chapter 4 Connecting the Cisco uBR7200 Series Router to the Cable Headend

Measuring the Upstream RF Signal

Figure 4-42

Analyzing the Upstream RF Signal—1500 Byte Data Packets

Note

Both of the previous examples feature 16-QAM transmission with a channel width of 3.2 MHz, yielding
a 10-Mbit/sec data rate. In addition, these examples have an optimal upstream carrier-to-noise ratio of
approximately 50 dB.

Now it is time to view your upstream RF signal with multiple remote cable modems.

Figure 4-43

and

Figure 4-44

both display upstream RF signals encompassing more than one remote cable modem. In

each case, there are two bandwidth requests followed by their respective ping packet returns, both at
slightly different amplitudes. This situation is most commonly caused by a difference in the receive
power from the two cable modems in question. In the examples the remote cable modem with the lesser
amplitude is “cable modem A” and the other is “cable modem B.”

In the following example, cable modem A and cable modem B have been artificially configured to yield
a larger than normal difference in amplitude between their respective upstream RF transmissions. Under
normal conditions, the maximum difference in amplitude between any cable modems will be about
1.5 dB. Differences greater than 1.5 dB indicate a possible cable plant or remote cable modem problem.

Note

To further illustrate this point, you can log in to your Cisco uBR7200 series router using a console
terminal and by entering the

show cable modem

command to obtain a report of the receive power ratings

for each modem. In the example, the receive power ratings for remote cable modems A and B are –2
dBmV and 0 dBmV, respectively.

The two bandwidth requests and ping packet returns on the upstream RF signal for cable modems A and
B are slightly different in

Figure 4-43

and

Figure 4-44

. Differences in the distance between bandwidth

requests are primarily caused by the contention-based nature of multiple remote cable modems on the
same line. Differences in the distance between ping packet returns are primarily caused by factors such
as packet size and system loading.

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Содержание 7246 - uBR Router

Страница 1: ...Router Hardware Installation Guide THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE ALL STATEMENTS INFORMATION AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS Text Part Number OL 5421 ...

Страница 2: ... turning it off If the interference stops it was probably caused by the Cisco equipment or one of its peripheral devices If the equipment causes interference to radio or television reception try to correct the interference by using one or more of the following measures Turn the television or radio antenna until the interference stops Move the equipment to one side or the other of the television or...

Страница 3: ...1 3 Cisco uBR7200 Series Network Interface Overview 1 5 Card Slot and Logical Interface Numbering 1 5 Cisco uBR7246 1 6 Cisco uBR7246VXR 1 6 MAC Layer Address 1 7 Supported System Configurations Overview 1 8 Basic Internet Access Services 1 8 VPN Services 1 10 IP Telephony Services 1 11 Telco Return 1 11 Hardware Component Descriptions 1 12 Network Processing Engine 1 13 NPE Comparisons 1 13 Input...

Страница 4: ...al Operation 2 6 General Precautions 2 7 Power Considerations 2 7 Required Network Information 2 7 Before You Begin 2 8 Installation Tools 2 8 Rack Mount and Cable Management Kit 2 9 Equipment Required to Verify Your Plant s RF Setup 2 9 Shipping Container Contents 2 10 Verifying the Shipping Container Contents 2 11 Provisioning the Cable Headend 2 11 Two Way Data and VoIP 2 11 Headend Certificati...

Страница 5: ...11 Installing the Chassis in a Workbench or Tabletop Environment 3 13 Installing the Cable Management Bracket on a Cisco uBR7200 Series Router in a Workbench or Tabletop Environment 3 14 Cabling 3 14 Connecting Port Adapter Cables 3 14 Connecting Cisco Cable Clock Card Cables Cisco uBR7246VXR Only 3 15 Connecting Cable Interface Line Card Cables 3 15 Connecting I O Controller Cables 3 15 Console a...

Страница 6: ...ng the Downstream RF Signal at the Upconverter Output 4 19 Measuring the Downstream RF Signal Using CATV Mode on a Spectrum Analyzer 4 23 Measuring the Downstream IF Signal at the Cisco uBR7200 Series Router Using CATV Mode 4 23 Measuring the Downstream RF Signal at the Upconverter Output Using CATV Mode 4 26 Connecting and Configuring the Upstream 4 30 Connecting the Upstream to the Optical Recei...

Страница 7: ... 6 7 Troubleshooting Port Adapters 6 8 Troubleshooting the Cisco Cable Clock Card Cisco uBR7246VXR Only 6 8 Troubleshooting Cable Interface Line Cards 6 9 Other Troubleshooting Information Websites 6 9 About Verifying the Downstream Signal 6 10 A P P E N D I X A Cisco uBR7200 Series Router Specifications A 1 Cisco uBR7246 Physical and System Specifications A 1 Cisco uBR7246VXR Physical and System ...

Страница 8: ...Through Cable C 5 Fiber Optic Cables and Connectors C 6 A P P E N D I X D Industry Standard Wiring Plans D 1 About Wiring Standards D 1 TIA EIA Standards Information D 2 Optical Fiber Color Codes D 3 Telephone Wire Color Codes D 3 A P P E N D I X E Frequency Allocation Tables E 1 Standards Comparisons E 2 NTSC Cable Television Channels and Relative Frequencies E 3 NTSC M Cable Television Frequenci...

Страница 9: ...est page xvii Document Revision History The Document Revision History table below records technical changes to this document Document Objectives This guide provides hardware installation instructions for the Cisco uBR7200 series universal broadband routers Cisco uBR7246 Cisco uBR7246VXR Revision Date Reason OL 5421 03 December 15 2008 Added NPE G2 information and removed support for Cisco uBR7225V...

Страница 10: ... 1030 Document Organization This hardware installation guide is organized into the following chapters and appendixes Chapter Title Description Chapter 1 Cisco uBR7200 Series Overview About Cisco uBR7200 series chassis and components Chapter 2 Preparing the Cisco uBR7200 Series Router for Installation Safety considerations tools and other equipment required to prepare your site Chapter 3 Installing...

Страница 11: ...nts in square brackets are optional Alternative but required keywords are grouped in braces and separated by vertical bars Examples use these conventions Terminal sessions and sample console screen displays are in screen font Information you enter is in boldface screen font Nonprinting characters such as passwords are in angle brackets Default responses to system prompts are in square brackets Exc...

Страница 12: ...slation in the translated safety warnings that accompanied this device Statement 1071 SAVE THESE INSTRUCTIONS Waarschuwing BELANGRIJKE VEILIGHEIDSINSTRUCTIES Dit waarschuwingssymbool betekent gevaar U verkeert in een situatie die lichamelijk letsel kan veroorzaken Voordat u aan enige apparatuur gaat werken dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico s en dient ...

Страница 13: ...ICUREZZA Questo simbolo di avvertenza indica un pericolo La situazione potrebbe causare infortuni alle persone Prima di intervenire su qualsiasi apparecchiatura occorre essere al corrente dei pericoli relativi ai circuiti elettrici e conoscere le procedure standard per la prevenzione di incidenti Utilizzare il numero di istruzione presente alla fine di ciascuna avvertenza per individuare le traduz...

Страница 14: ... encontrará el número que le ayudará a encontrar el texto traducido en el apartado de traducciones que acompaña a este dispositivo GUARDE ESTAS INSTRUCCIONES Varning VIKTIGA SÄKERHETSANVISNINGAR Denna varningssignal signalerar fara Du befinner dig i en situation som kan leda till personskada Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till va...

Страница 15: ... da declaração fornecido ao final de cada aviso para localizar sua tradução nos avisos de segurança traduzidos que acompanham o dispositivo GUARDE ESTAS INSTRUÇÕES Advarsel VIGTIGE SIKKERHEDSANVISNINGER Dette advarselssymbol betyder fare Du befinder dig i en situation med risiko for legemesbeskadigelse Før du begynder arbejde på udstyr skal du være opmærksom på de involverede risici der er ved ele...

Страница 16: ...xvi Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Preface ...

Страница 17: ...ormation see the monthly What s New in Cisco Product Documentation which also lists all new and revised Cisco technical documentation at http www cisco com en US docs general whatsnew whatsnew html Subscribe to the What s New in Cisco Product Documentation as a Really Simple Syndication RSS feed and set content to be delivered directly to your desktop using a reader application The RSS feeds are a...

Страница 18: ...xviii Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Preface ...

Страница 19: ...d cable modems or set top boxes with integrated DOCSIS or EuroDOCSIS cable modems on the cable television network and present that traffic to local and remote IP hosts For cable plants not fully upgraded to support two way cable transmission the routers work in conjunction with dial up access products to support upstream traffic from DOCSIS based cable interfaces connected to the Public Switched T...

Страница 20: ...ibutes power from the power supplies to the I O controller cable interface cards port adapters cable clock card fan tray and NPE Cisco uBR7200 series universal broadband routers may be installed on a tabletop or rack mounted A rack mount kit ships with each router The rack mount kit includes the hardware needed to mount the router in a standard 19 inch equipment rack or telco type rack The Cisco u...

Страница 21: ...sco uBR7246 router does not support a mix of AC input and DC input power supplies in the same chassis If an AC input power supply is installed and you want to add a second redundant power supply you must add another AC input power supply If you want a redundant DC input power supply configuration you must remove any installed AC input power supplies and replace them with two DC input power supplie...

Страница 22: ...te Figure 1 2 shows the rear of a Cisco uBR7246VXR router configured with two 280W AC input power supplies Caution If you are using two power supplies make sure that each one is plugged into a separate branch circuit A fully loaded router with two installed power supplies and all chassis slots filled weighs approximately 100 pounds 45 4 kg For clearance requirements and rack mount installation con...

Страница 23: ...er or a cable interface card is installed and the logical interface number is the physical location of the interface port on a port adapter Port adapter and cable interface card slots maintain the same slot number regardless of whether other port adapters or cable interface cards are installed or removed However when you move a port adapter or cable interface card to a different slot the logical i...

Страница 24: ...ace cards in the Cisco uBR7246VXR provide the connection between the router s three PCI buses mb0 mb1 and mb2 and external networks Bus mb0 is for the optional Fast Ethernet port on the I O controller bus mb1 is for port adapter slot 1 and cable interface card slot 3 and slot 5 and bus mb2 is for port adapter slot 2 and cable interface card slot 4 and slot 6 The Cisco uBR7246VXR port adapter slots...

Страница 25: ... the port adapter or cable interface card you removed the system immediately brings it online In order to allow OIR an address allocator with a unique MAC address is stored in EPROM on the universal broadband router midplane Each address is reserved for a specific port and slot in the router regardless of whether a port adapter or a cable interface card resides in that slot The MAC addresses are a...

Страница 26: ...ng PAL SECAM channel plans through Cisco MC16E cable interface cards installed in the chassis For bidirectional cable plants a portion of the spectrum in the 5 to 65 MHz range is used for upstream data transmission The following sections illustrate the supported configurations including Basic Internet access services Virtual private network VPN services IP telephony services Telco return Basic Int...

Страница 27: ...sco also provides an integrated suite of configuration tools including CNR for relatively large cable networks called Cisco Subscriber Registration Center CSRC CSRC allows large scale configuration and management of broadband modems Leveraging the extensibility of CNR CSRC enables and administers subscriber self registration The directory enabled architecture of CSRC allows it to integrate with li...

Страница 28: ...tribution hub depending upon your particular Cisco IOS software image Figure 1 6 Two Way VPN Network Example Note Many VPN architectures involve the use of encryption and decryption Encryption and decryption are subject to export licensing controls For more information refer to Regulatory Compliance and Safety Information for the Cisco uBR7200 Series Universal Broadband Routers at the following UR...

Страница 29: ...from cable interface cards connected to the cable system and accepts upstream traffic via a combination of the local PSTN and IP network path that terminates at the Cisco uBR7200 series router Upstream data transmission takes place over a telephone modem external or internal to a cable interface as well as a cable interface card in a PC based on the third party cable interface vendor connected to ...

Страница 30: ...products hw routers ps341 prod_installation_guides_list html The following components are described Network Processing Engine page 1 13 Input Output Controller page 1 15 Cisco Cable Interface Line Cards page 1 17 Cisco Cable Clock Card Cisco uBR7246VXR Only page 1 17 Cisco Port Adapters page 1 18 Power Supplies page 1 21 Cisco uBR7246 and Cisco uBR7246VXR Chassis page 1 25 Subchassis and Midplane ...

Страница 31: ...r these components View the document online at the following URL http www cisco com en US docs routers 7200 install_and_upgrade network_process_engine_install_ config npense html NPE Comparisons The network processing engines used in the routers include the NPE 150 NPE 200 NPE 225 NPE 300 NPE 400 Cisco uBR7200 NPE G1 and Cisco uBR7200 NPE G2 Note The NPE 150 NPE 200 and NPE 300 are end of life pro...

Страница 32: ...cessor Cisco uBR7200 NPE G1 SDRAM 256 MB default 512 MB and 1 GB There are two DRAM memory slots so 256 MB of memory consists of two 128 MB memory SODIMMs 512 MB consists of two 256 MB memory SODIMMs and 1 GB consists of two 512 MB memory SODIMMs It is necessary to have the same size SODIMM in each memory bank on an NPE G1 The type of DRAM memory being used on the NPE G1 is double data rate DDR me...

Страница 33: ... the Cisco uBR7246 router Input Output Controller Note Cisco uBR7200 NPE G1 and Cisco uBR7200 NPE G2 does not require the use of an I O controller The I O controller shares the memory functions and the environmental monitoring functions with the NPE or the network services engine NSE The I O controller contains the following components Dual EIA TIA 232 channels for local and auxiliary console port...

Страница 34: ...l For I O controller replacement instructions refer to Input Output Controller Replacement Instructions To view the document online go to the following URL http www cisco com en US docs routers 7200 install_and_upgrade 7200_i o_controller_install 4447i o html Depending on whether the Fast Ethernet port is present either two or four LEDs on the I O controller faceplate indicate system status two ad...

Страница 35: ... line cards blank port adapters and blank cable clock cards are installed in unoccupied chassis slots Also make sure that power supply filler plates with their attached air dams are installed in unoccupied power supply bays For more information regarding specific cable interface line cards refer to the Cisco uBR7200 Series Cable Interface Line Card Hardware Installation Guide To view the document ...

Страница 36: ...llowing URL http www cisco com en US products hw cable ps2217 prod_release_notes_list html For port adapter and HSSI installation information see the port adapter configuration notes at the following URL http www cisco com en US docs interfaces_modules port_adapters install_upgrade cables_and_atten uator hssi_cable_install HSSIcab html Caution To ensure adequate airflow across the router s port ad...

Страница 37: ...C Not applicable PA 8T X21 8 port X 21 synchronous serial port adapter 12 0 1 T 12 1 1a T1 12 1 EC Not applicable PA 4E1G 75 4 port unbalanced 75 ohm E1 G 703 G 704 synchronous serial port adapter 12 0 1 T 12 1 1a T1 12 1 EC 12 1 3 T 12 1 EC PA 4E1G 120 4 port balanced 120 ohm E1 G 703 G 704 synchronous serial port adapter 12 0 1 T 12 1 1a T1 12 1 EC 12 1 3 T 12 1 EC PA E3 1 port high speed serial...

Страница 38: ... adapter 12 0 1 T 12 1 1a T 12 1 EC Not applicable PA A2 4T1C OC3SM 5 port ATM CES6 4 T1 CBR7 ports and 1 OC 3 ATM single mode port port adapter 12 0 1 T 12 1 1a T1 12 1 EC Not applicable PA A2 4T1C T3ATM 5 port ATM CES6 4 T1 CBR7 ports and 1 T3 ATM port port adapter 12 0 1 T 12 1 1a T1 12 1 EC Not applicable PA A3 E3 1 port E3 ATM PCI based port adapter 12 0 1 T 12 1 1a T1 12 1 EC Not applicable ...

Страница 39: ... Cisco uBR7200 Series Universal Broadband Router 550 Watt DC Input Power Supply Replacement Instructions PA POS OC3SMI 1 port OC3 single mode intermediate reach port adapter 12 0 1 T 12 1 1a T1 12 1 EC 12 0 7 T 12 1 1a T1 12 1 EC PA POS OC3MM 1 port POS OC3 multimode port adapter 12 0 1 T 12 1 1a T1 12 1 EC 12 0 7 T 12 1 1a T1 12 1 EC Dynamic Packet Transport DPT PA SRP OC12SMX 2 port SRP8 OC12 si...

Страница 40: ...o the site AC power source A cable retention clip secures the power cable to the AC input power supply Note The AC input power supply has an electrical current rating of 7A for the Cisco uBR7246 and Cisco uBR7246VXR routers Figure 1 9 Cisco uBR7246 and Cisco uBR7246VXR AC Input Power Supply The DC input power supply has a receptacle for two DC input power leads Three M5 grounding receptacles are l...

Страница 41: ... to the off position or the power cord is disconnected from the back of the power supply or the power source For a description of power supply shutdown conditions and thresholds refer to the Environmental Monitoring and Reporting Functions section on page 5 2 Caution When the input power to Cisco uBR7200 series universal broadband router power supply is disconnected or lost the power supply enters...

Страница 42: ...using the attached handle Detailed instructions for removing and replacing the fan tray are contained in the document Cisco uBR7200 Series Universal Broadband Router Fan Tray Replacement Instructions at the following URL http www cisco com en US docs cable cmts ubr7200 installation 4939sbc html Figure 1 11 Cisco uBR7246VXR and Cisco uBR7246 Fan Tray The fan tray draws cooling air in through the in...

Страница 43: ...w Top View Cisco uBR7246 and Cisco uBR7246VXR Chassis The front of the chassis has one slot for an I O controller two slots for single width port adapters or one dual width port adapter four slots for cable interface cards one slot for a fan tray and one bay for the subchassis and midplane See Figure 1 13 Port adapter and line card end Power supply end Inlet flow Exhaust air fan side H10077 ...

Страница 44: ...mory SDRAM on the NPE 400 Cisco uBR7200 NPE G1 or the Cisco uBR7200 NPE G2 Arbitrates traffic across the PCI buses Generates clock signals for the port adapter on the PCI bus Cisco uBR7246VXR and Cisco uBR7246 Subchassis The Cisco uBR7246VXR and Cisco uBR7246 subchassis the rear of the routers have two bays for power supplies and one slot for a network processing engine See Figure 1 14 The cable i...

Страница 45: ...chassis and Midplane Flash Memory Cards The Cisco uBR7200 series universal broadband router supports up to two installed Type II PCMCIA flash memory cards provided by Cisco Flash memory flash memory cards and the flash SIMM on the I O controller allows you to remotely load and store multiple system and boot helper images You can download a new image over the network and then add the new image to f...

Страница 46: ...B of storage space The CompactFlash Disk has controller circuitry that allows it to emulate a hard disk and automatically maps out bad blocks and performs automatic block erasure The CompactFlash Disk also provides the capability to allocate noncontiguous sectors which eliminates the need for the squeeze command which was required with older style linear flash memory cards to recover the space use...

Страница 47: ... help to ensure your safety and protect the equipment This list does not cover all potentially hazardous situations so be alert Before installing configuring or maintaining the Cisco uBR7246 or Cisco uBR7246VXR routers review the safety warnings listed in the Regulatory Compliance and Safety Information for Cisco uBR7200 Series Universal Broadband Routers at the following URL http www cisco com en...

Страница 48: ... personnel only as defined by AS NZS 3260 Clause 1 2 14 3 Service Personnel Warning Ultimate disposal of this product should be handled according to all national laws and regulations Statement 1040 Warning There is the danger of explosion if the battery is replaced incorrectly Replace the battery only with the same or equivalent type recommended by the manufacturer Dispose of used batteries accord...

Страница 49: ... basic guidelines when working with any electrical equipment Before beginning any procedures requiring access to the chassis interior locate the emergency power off switch for the room in which you are working Carefully examine your work area for possible hazards such as moist floors ungrounded power extension cables and missing safety grounds Disconnect all power and external cables before instal...

Страница 50: ...ch cable interface card each port adapter and the cable clock card consists of a printed circuit board that is fixed in a metal carrier Electromagnetic interference EMI shielding connectors and a handle are integral components of the carrier Although the carrier helps protect the boards use an antistatic strap whenever handling the network processing engine I O controller cable interface cards por...

Страница 51: ...sary maintenance plan your site configuration and prepare your site before installation Take into account the following criteria Verify that your cable network meets system requirements and DOCSIS or EuroDOCSIS downstream and upstream specifications Select forward and reverse channel frequencies from the range specified in your channel plan Make sure that the site maintains an ambient temperature ...

Страница 52: ...rovide airflow through the Cisco uBR7200 series router cooling air is drawn in through the air intake vent on the right side of the chassis when viewing the router from the front and is exhausted through the left side of the chassis Keep the right and left side of the chassis clear of obstructions and away from the exhaust of other equipment Site Configuration Maintaining Normal Operation Planning...

Страница 53: ...er supplies and any power supply filler plates are in place and secure The fans direct cooling air throughout the chassis interior a loose component or empty slot can redirect the airflow away from active components and cause overheating Power Considerations Follow these precautions and recommendations when planning power connections to the Cisco uBR7200 series router Check the power at your site ...

Страница 54: ...VoIP network Gateway and call agent configuration for your SGCP VoIP network Zone names network numbers or node numbers for the new interfaces if required Operating speeds for specific interfaces For example serial interfaces operate at speeds of up to 2 Mbps The speed of an interface often depends on the speed of the remote device to which it is attached Installation Tools Your Cisco uBR7200 seri...

Страница 55: ...racket to the chassis Four 10 32 x 3 8 inch slotted binderhead screws to secure the rack mount brackets to the rack rails Note You must install the cable management bracket on the right side of the Cisco uBR7246 or Cisco uBR7246VXR chassis when viewed from the front If the cable management bracket is installed on the left side of the chassis where the internal fans are located you will not be able...

Страница 56: ...a T1 network you need a T1 CSU DSU that converts the High Level Data Link Control HDLC synchronous serial data stream into a T1 data stream with the correct framing and ones density Some telephone systems require a minimum number of 1 bit per time unit in a data stream called ones density Several T1 CSU DSU devices are available as additional equipment and most provide either a V 35 EIA TIA 449 or...

Страница 57: ...sioning documentation or both Cisco IOS software documentation if ordered Step 3 Verify that the port adapters installed in your Cisco uBR7200 series router match the port adapter types on the packing list Step 4 Verify that the number of cable interface cards installed in your Cisco uBR7200 series router matches the number of cable interface cards that you ordered Step 5 Refer to Appendix G Site ...

Страница 58: ...requency Upconverters are available from many manufacturers and can be found in configurations ranging from a fixed number of ports to flexible multislot multiport models Install and configure enough upconverter ports to support the number of downstream cable interface card ports installed in each Cisco uBR7200 series router you are installing The number of upconverter units needed depends on the ...

Страница 59: ...3 High frequency signals flow in the downstream direction from the Cisco uBR7200 series router to cable interfaces and STBs Low frequency signals flow in the upstream direction from the cable interfaces to the Cisco uBR7200 series router A diplex filter has three ports low high and common The downstream attaches to the high port because it runs at high frequency The upstream attaches to the low po...

Страница 60: ... components include Dial up access server for example the Cisco AS5300 or Cisco AS5800 RADIUS dial security server All third party telco return cable interfaces are DOCSIS compliant Your Cisco IOS software image supports telco return functionality The following sections describe CMTS equipment necessary to support telco return service Dial Up Remote Access Servers Because a telco return cable netw...

Страница 61: ...anage traffic between their local cable system networks as well as the networks of other VoIP gatekeepers VoIP SGCP Pass Through To support digitized voice transmission using Simple Gateway Control Protocol SGCP be sure to include VoIP gateways and external call control elements often referred to as call agents in your configuration Cisco IOS Release 12 0 6 T and later versions of Cisco IOS Releas...

Страница 62: ...ed distances or if wires pass between buildings give special consideration to the effect of a lightning strike in your vicinity The electromagnetic pulse caused by lightning or other high energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices If you have had EMI problems in the past you might want to consult experts in electrical surge suppression...

Страница 63: ...s such as a power strip that could impair rack mount installation If a power strip does impair a rear rack mount installation remove the power strip before installing the Cisco uBR7200 series router in the rack then replace it after the chassis is installed As an alternative you can mount the Cisco uBR7200 series router on an equipment shelf if the rack dimensions allow you to secure the router to...

Страница 64: ...you are designing a customized shelf We recommend that you use the rack mount kit designed for your particular Cisco uBR7200 series router Rack mount kit for the Cisco uBR7246VXR or Cisco uBR7246 product number ACS uBR7200 RMK Allow sufficient clearance around the rack for maintenance If the rack is mobile you can push it back near a wall or cabinet for normal operation and pull it out for mainten...

Страница 65: ...hat is already installed in the rack Ensure that cables from other equipment will not impair access to the port adapters or require you to disconnect cables unnecessarily to perform equipment maintenance or upgrades You cannot install the cable management bracket on a Cisco uBR7200 series router that you have mounted from the front In addition to the preceding guidelines review the precautions for...

Страница 66: ...pleted Site power voltages verified Site environmental specifications verified Downstream and upstream channel plans created Cable plant balanced swept and verified to comply with DOCSIS or EuroDOCSIS recommendations Optical receivers adjusted for proper upstream RF output levels Required passwords IP addresses device names available All additional CMTS equipment to support Internet access service...

Страница 67: ...t adapter slots Up to four cable interface cards blank cable interface cards should be installed in empty cable interface line card slots Up to two flash memory cards Note An optional cable clock card can be installed in a Cisco uBR7246VXR The following accessories might arrive in separate shipping containers Rack mount and cable management kit Two rack mount brackets one cable management bracket ...

Страница 68: ...2 22 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Chapter 2 Preparing the Cisco uBR7200 Series Router for Installation Component Checklists ...

Страница 69: ... or telco type equipment racks The rack mount brackets are not suitable for use with other racks such as 23 inch telco racks The cable management brackets are designed to relieve the strain on port adapter interface cables that are installed on port adapters in a Cisco uBR7200 series If you are installing an equipment shelf or using mounting hardware other than that supplied with the chassis revie...

Страница 70: ...erent methods for rack mounting the Cisco uBR7200 series universal broadband router this section displays figures specific to the Cisco uBR7246 The setup necessary to rack mount the Cisco uBR7246VXR router is the same as for the Cisco uBR7246 router in all cases Table 3 1 Cisco uBR7200 Series Router Installation Checklist Task Verified by Date Router and all accessories unpacked Types and numbers ...

Страница 71: ...e interface card end the front of the chassis recessed in the rack install the rack mount brackets at the rear of the chassis in the orientation shown in Figure 3 2 on page 3 4 If you want the front of the chassis mounted flush with the front posts of the rack install the rack mount brackets at the front of the chassis in the orientation shown in Figure 3 3 on page 3 4 If you want the front of the...

Страница 72: ... 3 2 Installing the Chassis in a 4 Post Rack Rear Installation See the Installing Rack Mount Brackets on the Rear of the Chassis section on page 3 7 Figure 3 3 Installing the Chassis in a 4 Post Rack Flush Mounted Front Installation See the Installing Rack Mount Brackets on the Front of the Chassis section on page 3 8 for bracket mounting information 72798 Rack mount bracket 72799 Rack mount brack...

Страница 73: ...a Telco Type Rack Cable Management Bracket Requirements There are two cable management bracket configurations available for rack mounting the Cisco uBR7200 series router In the first configuration for a 4 post rack the rack mount brackets are installed at the rear of the chassis and the cable management bracket is installed at the right front of the chassis See Figure 3 6 on page 3 6 You must inst...

Страница 74: ...of the chassis See Figure 3 7 on page 3 6 You must install both sets of brackets before you install the chassis in the rack Note The cable management bracket must be installed on the right side of the chassis when viewed from the front for the Cisco uBR7246 and Cisco uBR7246VXR routers Figure 3 6 Installing the Chassis in a 4 Post Rack with an Installed Cable Management Bracket Figure 3 7 Installi...

Страница 75: ...ket separately however both rack mount brackets and the single cable management bracket must be installed on the chassis before the chassis is installed in the rack The parts and tools required for installing the rack mount and cable management brackets are listed in the Installation Tools section on page 2 8 Installing Rack Mount Brackets on the Rear of the Chassis To install the rack mount brack...

Страница 76: ...njury review the safety precautions in Chapter 2 Preparing the Cisco uBR7200 Series Router for Installation before installing the universal broadband router in a rack Installing Rack Mount Brackets on the Front of the Chassis To install the rack mount brackets on the chassis for a front rack mount configuration complete the following steps Note If you plan to use the cable management bracket in yo...

Страница 77: ...ront of the Chassis Is Flush with the Rack Figure 3 10 Installing the Rack Mount Brackets so the Front of the Chassis Protrudes Out of the Rack Step 3 Thread four M4 x 6 mm Phillips flathead screws through the rack mount bracket and into the side of the chassis Use a number 2 Phillips screwdriver to tighten the screws Step 4 Repeat Step 1 through Step 3 for the other rack mount bracket 10034 Rack ...

Страница 78: ...llowing steps Step 1 Locate the threaded holes in the middle sides of the chassis Step 2 Align the first rack mount bracket to the threaded holes in the right side of the chassis See Figure 3 11 Note There are eight holes in each of the rack mount brackets for the Cisco uBR7246 and Cisco uBR7246VXR chassis You may use either set of four holes to align the bracket to the threaded holes in the sides...

Страница 79: ...ve the paint from the rack and apply an anti oxidant at the contact points to ensure reliable metal to metal contact After installing the brackets on the chassis mount the chassis by securing the rack mount brackets to the posts or mounting strips in the rack using the slotted screws provided Caution Because the brackets support the weight of the entire chassis be sure to use all of the required s...

Страница 80: ...st or mounting strip in the rear installation configuration See Figure 3 2 on page 3 4 Step 5 While keeping the brackets flush against the posts or mounting strips position the Cisco uBR7200 series so that the holes in the brackets are aligned with those in the mounting strips Step 6 Insert the 10 32 x 3 8 slotted screws two to a side through the brackets and into the mounting strip use the top an...

Страница 81: ...t is being installed in an enclosed cabinet where ventilation is adequate If you plan to install the cable management brackets on the front of the chassis set aside the cable management brackets and the four M4 x 6 mm Phillips panhead screws Warning Do not stack the chassis on any other equipment If the chassis falls it can cause severe bodily injury and equipment damage Statement 48 Complete the ...

Страница 82: ...e installation Cabling This section provides information on connecting port adapter cable clock card cable interface card and I O controller cables to your Cisco uBR7200 series universal broadband router Warning This product is not intended to be directly connected to the Cable Distribution System Additional regulatory compliance and legal requirements may apply for direct connection to the Cable ...

Страница 83: ... interface card installation document Refer to the Cisco uBR7200 Series Interface Line Card Hardware Installation at the following URL http www cisco com en US docs interfaces_modules cable line_cards installation guide mcxxfru html Connecting I O Controller Cables Warning To avoid electric shock do not connect safety extra low voltage SELV circuits to telephone network voltage TNV circuits LAN po...

Страница 84: ...a data terminal which you use to configure the interfaces and bring up the Cisco uBR7200 series universal broadband router The auxiliary port is a DTE DB 25 plug for connecting a modem or other DCE device such as a channel service unit data service unit CSU DSU or other router to the Cisco uBR7200 series router See Figure 3 13 on page 3 17 Note Both the console and auxiliary ports are asynchronous...

Страница 85: ...erface cable between the auxiliary port and the equipment you are connecting For console and auxiliary port pinouts refer to the Console Port Signals section on page 3 17 and the Auxiliary Port Signals section on page 3 18 Console Port Signals Both Data Set Ready DSR and Data Carrier Detect DCD signals are active when the system is running The Request To Send RTS signal tracks the state of the Cle...

Страница 86: ...dards The single MII connection requires an external transceiver that permits connection to multimode fiber for 100BASE FX or 100BASE T physical media See Figure 3 14 on page 3 19 Note This port does not support 10 Mbps Ethernet connectivity only 100 Mbps Fast Ethernet Table 3 2 Console Port Signal Pin Signal Direction Description 1 GND Ground 2 TxD Transmit Data 3 RxD Receive Data 6 DSR Data Set ...

Страница 87: ...pe connectors for optical fiber BNC connectors and so forth Figure 3 15 shows the pin orientation of the female MII receptacle on the Fast Ethernet port The MII receptacle uses two 56 screw type locks called jackscrews to secure the cable or transceiver to the MII port MII cables and transceivers have knurled thumbscrews that you fasten to the jackscrews on the MII connector and tighten with your ...

Страница 88: ...Clock MDC 4 7 Yes Receive Data RxD 9 Yes Receive Clock Rx_CLK 3 10 Yes Receive Error Rx_ER 8 Yes Receive Data Valid Rx_DV 18 Yes Collision COL 19 Yes Carrier Sense CRS 2 Yes MII Data Input Output MDIO 22 39 Common ground 1 20 21 40 5 0 volts V 1 Any pins not indicated are not used 2 Tx_CLK is provided by the external transceiver 3 Rx_CLK is provided by the external transceiver Table 3 4 MII Connec...

Страница 89: ...o be grounded to comply with emission and immunity requirements Ensure that the switch functional ground lug is connected to earth ground during normal use Statement 1064 Warning This equipment must be grounded Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor Contact the appropriate electrical inspection authority or an electrician ...

Страница 90: ...C receptacle by sliding the cable retention clip to the right until it fits around the connector The cable retention clip provides strain relief for the AC power cable For additional AC power cable strain relief secure the cable to the power supply handle by inserting a nylon cable tie through the hole in the handle and around the cable See Figure 3 16 Figure 3 16 Connecting AC Input Power Step 4 ...

Страница 91: ...n restricted access areas A restricted access area can be accessed only through the use of a special tool lock and key or other means of security Statement 1017 Note The color coding of the DC input power supply leads depends on the color coding of the DC power source at your site Typically green or green yellow is used for ground black is used for 48V return and red or white is used for 48V Make ...

Страница 92: ...or the ground 48V and 48V DC input leads run the 48V and 48V leads between the two strain relief studs on the power supply faceplate See Figure 3 19 on page 3 25 Warning The illustration shows the DC power supply terminal block Wire the DC power supply using the appropriate wire terminations at the wiring end as illustrated The proper wiring sequence is ground to ground positive to positive line t...

Страница 93: ... Cisco uBR7200 Series Router section on page 3 25 to start the universal broadband router Powering On the Cisco uBR7200 Series Router After installing your Cisco uBR7200 series universal broadband router and connecting cables power on the universal broadband router as follows Step 1 Check for the following Each port adapter is inserted in its slot and the port adapter lever or retention clip is in...

Страница 94: ...is installed The green OK LED on the power supply comes on Step 3 Listen for the fans you should immediately hear them operating In a very noisy environment also look for air movement around the chassis to verify that the fans are operating If the Cisco uBR7200 series router was recently switched off it might take up to 90 seconds for the power supply to restart and the fans to start operating Not...

Страница 95: ...sing the command interface to configure global system wide and interface specific parameters Caution The setup facility currently excludes cable specific configuration commands Upstream ports therefore have a default state of shutdown after the setup facility is run You must configure upstream parameters For additional information refer to the Cisco uBR7200 Series Software Configuration Guide at t...

Страница 96: ...3 28 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Chapter 3 Installing the Cisco uBR7200 Series Router Powering On the Cisco uBR7200 Series Router ...

Страница 97: ...view page 4 3 Connecting and Configuring the Downstream page 4 4 Measuring the Downstream RF Signal page 4 16 Connecting and Configuring the Upstream page 4 30 Measuring the Upstream RF Signal page 4 34 Measuring the RF Signal at the Forward Test Point on a Laser Transmitter page 4 49 Configuring the Digital Signal page 4 52 Note Before installing your Cisco uBR7200 series router analyze the radio...

Страница 98: ...r 40 dB attenuator 8 dB attenuator 18 dBmV 42 dBmV 58 dBmV 2 way splitter 10 dBmV 6 dB attenuator 40 dB attenuator 21 dB attenuator 31 dBmV 42 dBmV 49 dBmV 50 dBmV 2 way splitter 10 dBmV Laser transmitter Broadcast Narrowcast 0 to 20 dB attenuator as required 8 way tap 3 way splitter 17 dBmV video carrier typical 7 dBmV data carrier typical Optical splitter Node 1 Node 2 Downstream forward test po...

Страница 99: ... run near CATV cabling in the network Areas of signal ingress may be located and repaired by implementing a comprehensive signal leakage maintenance program Amplifier thermal noise Amplifiers add noise to the HFC network that usually goes unnoticed in video signals assuming a properly designed and operated network Improperly configured amplifiers will degrade digital data signals The larger the ne...

Страница 100: ...onnect the Cisco uBR7200 series to the HFC network and configure the network The following sections describe how to connect to and configure the downstream Installing and Configuring the Upconverter If you have not already done so unpack the IF to RF upconverter at your headend site and install it near your Cisco uBR7200 series universal broadband router Note Refer to the user documentation that a...

Страница 101: ...er For example The recommended IF input to the General Instrument C6U is 23 dBmV this upconverter requires 6 to 9 dB of attenuation on the input cable The IF input to the Vecima MA4040 is 33 dBmV this upconverter requires no attenuation on the input cable See Figure 4 3 To verify the input level connect a spectrum analyzer to the test point on the upconverter input If your upconverter is equipped ...

Страница 102: ...o verify the input level connect a spectrum analyzer to the test point on the upconverter input If your upconverter is equipped with a built in meter you do not need to connect a spectrum analyzer The IF input level at the test point should be 0 dBmV at 36 125 MHz Figure 4 4 Setting the European Upconverter Input Level Setting the Upconverter Output Level You must now set the upconverter output RF...

Страница 103: ...ou must now select an output frequency DOCSIS specifications permit channels from 91 to 857 MHz center frequency of 91 MHz is not required In the example shown in Figure 4 14 a center frequency of 610 MHz is used The following excerpts from the DOCSIS Radio Frequency Interface Specification define downstream digitally modulated carrier frequencies DOCSIS The downstream frequency plan should comply...

Страница 104: ...ng at your cable headend By following the steps in this procedure you can determine whether or not the amount of phase noise in your RF output signal is potentially detrimental to downstream data transmission Perform the following steps to measure the additive phase noise in your RF output signal Note Most spectrum analyzers are not designed to precisely measure phase noise Caution Performing the ...

Страница 105: ... of 44 MHz for a North American headend or 36 125 MHz for a European headend Step 4 Set the resolution bandwidth to 100 kHz the video bandwidth to 1 MHz the span to 12 MHz and the sweep time to 20 msec Your analyzer should display a signal similar to the one shown in Figure 4 7 Figure 4 7 Downstream IF Channel Power Step 5 Stop downstream digital data transmission from the cable interface card by ...

Страница 106: ... signal the center 6 MHz in Figure 4 8 by reducing the span on your spectrum analyzer from 12 MHz to 6 MHz Step 7 Change the resolution bandwidth from 100 kHz to 1 kHz so that the sweep time slows to around 18 seconds Be sure however that you retain the 1 kHz video bandwidth and the same center frequency Your analyzer should display a signal similar to the one shown in Figure 4 9 Figure 4 9 6 MHz ...

Страница 107: ...ream IF signal on your spectrum analyzer you must go through the same sort of procedure for the RF output signal from your upconverter Step 1 Disconnect the spectrum analyzer from the downstream IF interface on the cable interface card and reconnect the downstream IF interface to the IF input on your upconverter Note Be sure that you have added the appropriate attenuation to your downstream path i...

Страница 108: ...f your comparison resembles Figure 4 11 your upconverter is operating properly Note If you suspect that your upconverter is drifting over time place two additional traces on your screen min hold and max hold while comparing your two signals Should either trace change shape your upconverter has failed This method can help you discover mechanical tapping or vibration related problems which can have ...

Страница 109: ...phase noise at and below 10 kHz Step 1 Eliminate the offset between the IF and RF output traces by fine tuning the RF output center frequency on the spectrum analyzer The difference between the center frequencies in these two signals is referred to as the frequency error of the upconverter Note The FCC specifies that the frequency error of an upconverter cannot exceed 5 kHz in the aviation bands S...

Страница 110: ...onverter might not be suitable for digital modulation formats If possible double check your upconverter performance with a specialized analyzer such as a QAM analyzer or other type of dedicated phase noise measurement equipment Note If you are concerned about possible upconverter drift or intermittency try viewing three curves on your spectrum analyzer IF plot or real time RF plot max hold RF plot...

Страница 111: ... will overdrive the input on the transmitter and it will not work properly To compensate for this insertion loss you must add attenuation to the digital carrier laser input The input level for the data carrier is 7 dBmV or 10 dB below the video carriers In this example start with a 20 dB attenuator to adjust for the insertion loss and passive loss in the headend cables See Figure 4 14 Figure 4 14 ...

Страница 112: ...re installed on the HFC network Typically this is the only place to test for downstream interference from the forward path Ensure that your sweep equipment is not programmed to transmit on the digital carrier Otherwise this can cause bit errors and packet loss resulting in unreliable cable modem operation You can verify the C N ratio estimate on a Cisco uBR900 series cable access router by followi...

Страница 113: ...se as a QAM digitally modulated carrier upconverter These units typically do not have the phase noise and linearity performance levels required for 64 and 256 QAM digital signals and they might cause degraded performance and possible system failure Measuring the Downstream RF Signal Using the Channel Power Option on a Spectrum Analyzer The following sections describe how to measure the downstream ...

Страница 114: ...asure the IF signal using the channel power option on your spectrum analyzer Set your channel spacing and your channel bandwidth to 6 MHz Your analyzer should display a signal similar to the one shown in Figure 4 16 Figure 4 16 Measuring the IF Channel Power Note The IF channel power in Figure 4 16 is 34 23 dBmV as displayed on the spectrum analyzer Step 6 Select the video averaging feature Your s...

Страница 115: ...deo averaging mode are typically around 2 5 dB below the actual channel power Measuring the Downstream RF Signal at the Upconverter Output Step 1 Disconnect the spectrum analyzer from the cable interface card downstream connector Step 2 Connect the downstream output of the cable interface card to the upconverter input connector Step 3 Connect the spectrum analyzer to the RF output of the upconvert...

Страница 116: ...trum analyzer to view the RF signal at the center frequency you selected for your headend In this example the RF center frequency is 699 MHz Set your span to 20 MHz Finally set your channel spacing and your channel bandwidth to 6 MHz If the RF signal is causing an overload condition on the spectrum analyzer input your analyzer might display a signal similar to the one shown in Figure 4 19 The slop...

Страница 117: ...to see if there is too much power on the upconverter output In Figure 4 21 the upconverter output is reading 64 31 dBmV which is beyond the DOCSIS specified range of 50 to 61 dBmV Tip A spectrum analyzer might become overloaded and produce false readings such as internally generated spurs when measuring a signal at this amplitude Figure 4 21 Measuring the RF Signal at the Upconverter Output Upconv...

Страница 118: ...ature on the spectrum analyzer The signal becomes smoother and frequency response problems might become visible Your analyzer now displays an RF signal similar to the one shown in Figure 4 23 Figure 4 23 Measuring the RF Signal at the Upconverter Output Using Video Averaging Tip The approximate in channel peak to valley flatness may be verified using the spectrum analyzer s video averaging feature...

Страница 119: ...ss This completes the procedure to measure the downstream RF signal using the channel power option Proceed to the Measuring the RF Signal at the Forward Test Point on a Laser Transmitter section on page 4 49 Measuring the Downstream RF Signal Using CATV Mode on a Spectrum Analyzer The following two sections describe the methods you may use to measure the downstream RF signal using CATV mode digita...

Страница 120: ...splay a signal similar to the one shown in Figure 4 24 Note Figure 4 24 shows the first of three screens that will be displayed by an Agilent 8591C when you use the analyzer in this mode Figure 4 25 is the last of the three screens displayed Figure 4 24 Viewing the Downstream IF Signal on a Spectrum Analyzer in CATV Mode Initial Screen Step 4 Advance to the last of the three screens in this displa...

Страница 121: ...ectrum Analyzer in CATV Mode Digital Channel Power Screen Step 6 Using the spectrum analyzer s reference level control adjust the amplitude of the displayed signal until the shape of the signal is clearly distinguishable as a digitally modulated carrier as shown in Figure 4 27 Figure 4 27 Measuring the IF Signal on a Spectrum Analyzer in CATV Mode Adjusted Digital Channel Power Screen Note The IF ...

Страница 122: ...nalyzer from the cable interface card downstream connector Step 2 Connect the downstream output of the cable interface card to the upconverter input connector Step 3 Connect the spectrum analyzer to the RF output of the upconverter Step 4 Set the upconverter output level to the manufacturer s recommended settings Typical output amplitudes range from 50 to 58 dBmV although DOCSIS specifies levels a...

Страница 123: ...converter Output in CATV Mode Initial Screen Step 7 Advance to the last of the three screens in this display Your analyzer should display a signal similar to the one shown in Figure 4 30 Figure 4 30 Viewing the RF Signal on a Spectrum Analyzer in CATV Mode Preliminary Digital Channel Power Screen Step 8 Enter a digital channel to measure and select digital channel power Your spectrum analyzer will...

Страница 124: ...ital Channel Power Screen Step 9 Using the spectrum analyzer s reference level control adjust the amplitude of the displayed signal until the signal peak is within the top graticule of the analyzer s display grid as shown in Figure 4 32 Figure 4 32 Measuring the RF Signal at the Upconverter Output in CATV Mode Adjusted Digital Channel Power Screen Step 10 Select the video averaging feature Your sp...

Страница 125: ... HFC network from operating The specified maximum peak to valley measurement from a Cisco cable interface card is 1 5 dB across 5 6 MHz At the output of the upconverter the maximum tilt should not exceed 1 5 dB across 5 6 MHz If the tilt is greater than 1 5 dB across 5 6 MHz when measured the upconverter might not be compatible with digital QAM signals or the upconverter might be defective Step 11...

Страница 126: ...itting to remote cable modems Accurately setting the power level helps to ensure reliable cable modem operation Table 4 1 provides upstream input power ranges for the various cable interface cards available for the Cisco uBR7200 series router depending on the channel bandwidth you are using Note If you have a Cisco MC16x cable interface card six upstream ports and one downstream port installed in ...

Страница 127: ...tance This procedure is known as establishing the X level test point See Figure 4 35 Figure 4 35 The X level Test Point Cisco uBR7200 series router 14044 Upstream Optical receiver To downstream forward test point on laser transmitter 40 dB attenuator 2 way splitter combiner 10 dB attenuator Optional attenuator to adjust X level point measurement X level test point signal level must be the same for...

Страница 128: ...Multiple X level Test Points Connected to One Upstream Port Figure 4 37 shows how three distribution network X level test points connected to the three different upstream ports are all calibrated to 10 dBmV using different attenuators Cisco uBR7200 series Downstream Upconverter 14046 Upstream 0 dBmV 3 dB attenuator 3 dB attenuator 3 dB attenuator 40 dB attenuator 3 dB attenuator 8 dB attenuator 21...

Страница 129: ... 2 way splitter 10 dBmV Diplex filter Downstream 0 to 5 dBmV Cable modem L H C 3 dB attenuator Diplex filter Downstream 0 to 5 dBmV Cable modem L H C Diplex filter 6 dB attenuator 40 dB attenuator 18 dBmV 42 dBmV 58 dBmV 2 way splitter 10 dBmV 6 dB attenuator 40 dB attenuator 21 dB attenuator 31 dBmV 42 dBmV 49 dBmV 50 dBmV 2 way splitter 10 dBmV X X X Reverse optical transmitter Optical receiver ...

Страница 130: ...lyzer to perform these measurements Step 1 Connect the spectrum analyzer to the upstream signal from your cable network Step 2 Turn the power switch on the spectrum analyzer to the ON position Step 3 Set the spectrum analyzer to view the upstream RF signal with a center frequency matching the actual upstream center frequency defined in your Cisco uBR7200 series configuration file Step 4 Set the sp...

Страница 131: ...um analyzer display in Figure 4 38 is the trigger line Step 6 Set the sweep value to 80 microseconds Your spectrum analyzer should display a signal similar to the one shown in Figure 4 39 Note Be sure that your particular spectrum analyzer is capable of supporting sweep times as short as 80 microseconds Figure 4 39 Measuring the Upstream RF Signal Setting the Sweep Time Period Step 7 Position the ...

Страница 132: ... frequency domain Max hold readings in the frequency domain can be inaccurate because the analyzer focuses on the peak power of the strongest ranging modem rather than the power levels of cable modems that are operating in a more ideal range Figure 4 40 Measuring the Upstream RF Signal Accurately Measured Amplitude on Spectrum Analyzer Step 9 Position a marker about 7 8 of the way into the preambl...

Страница 133: ...n levels Analyzing the Upstream RF Signal When you have set up your spectrum analyzer to accurately read the upstream RF signal you can verify that a remote cable modem is operating as it should by pinging the modem via a console terminal Step 1 Log in to your Cisco uBR7200 series universal broadband router with a console terminal Step 2 Adjust the sweep time on your spectrum analyzer to 20 msec S...

Страница 134: ...modem A and the other is cable modem B In the following example cable modem A and cable modem B have been artificially configured to yield a larger than normal difference in amplitude between their respective upstream RF transmissions Under normal conditions the maximum difference in amplitude between any cable modems will be about 1 5 dB Differences greater than 1 5 dB indicate a possible cable p...

Страница 135: ...er that they appear to be one rather large packet with a slight jump or decline in amplitude halfway through the measurement This is an indication that the upstream is 100 percent occupied during this time Figure 4 45 shows an upstream RF signal from a remote cable modem in a real life scenario including outside plant noise Notice the relatively tall spike at the very left edge of the ping packet ...

Страница 136: ...When measuring upstream signals using the zero span method a very wide resolution and video bandwidth give very accurate readings but render your readings susceptible to energy in adjacent channels As the number of upstream services increases so does the likelihood of interference from adjacent channels This section describes using the zero span power measurement method with a more narrow resoluti...

Страница 137: ...owing figures Figure 4 47 through Figure 4 50 are taken from a vector signal analyzer If you do not have access to a vector signal analyzer or wish to skip the following section describing its use when viewing your upstream signal proceed to Step 3 Step 2 Optional View your upstream signal using a vector signal analyzer such as the Agilent 89441A The advantage of displaying these signals with the ...

Страница 138: ...der of the digital transmission is spread across the entire channel Even though it may not seem so the total channel power across both the preamble and the subsequent data segment remains constant b Narrow the view on your vector signal analyzer to display only the preamble of the digital data signal in both the frequency domain and time domain The upper display in Figure 4 48 is a plot of only th...

Страница 139: ... this frequency domain phenomenon The spectrum analyzer is unable to capture the data as shown in the vector signal analyzer plots The power level in the upstream channel fluctuates by approximately 1 dB between Figure 4 47 and Figure 4 48 This difference is within both the measurement tolerance of the vector signal analyzer and the accuracy requirement for any DOCSIS based cable modem c Switch yo...

Страница 140: ... display a set of screens similar to those in Figure 4 50 Figure 4 50 displays the QPSK demodulation information for the same upstream signal as in Figure 4 49 However there are some notable differences in the information presented For example notice that the constellation and transition graphs top and bottom left both indicate only two of the four QPSK data points handling any bits Because this g...

Страница 141: ...nal Analyzer Plot of Upstream Data Burst Preamble Only Digital Demodulation Mode Note Before moving on to Step 3 be sure to hook your spectrum analyzer back up to the upstream signal source Step 3 On your spectrum analyzer narrow both the resolution and video bandwidth to 1 MHz You will notice that the preamble of the signal has dropped in amplitude yielding a spectrum analyzer display similar to ...

Страница 142: ... default variation between modems is up to 1 5 dB for most DOCSIS CMTS equipment Step 4 Using the examples in Table 4 2 on page 4 40 as a basis for the formula calculate the correct center frequency offset necessary to measure the preamble peak power when viewed in a narrow bandwidth In the example the channel width is 1 6 MHz which has a symbol rate of 1280 ksym sec therefore the appropriate offs...

Страница 143: ...608 MHz in this example Step 7 Reset both the resolution and video bandwidth of the signal back to 3 MHz but reduce the sweep time from 200 microseconds to 60 microseconds The resulting display similar to Figure 4 53 clearly shows the tight pattern of the preamble stretched across three quarters of the spectrum analyzer display Figure 4 53 Original Preamble Viewed with Accelerated Sweep Time Step ...

Страница 144: ...tal channel filter mask known as the alpha The value of alpha is 25 percent of an upstream DOCSIS channel s width and the peak signal energy spread across the entire upstream channel width Figure 4 54 Preamble with Decreased Amplitude and Condensed Sweep Time Step 9 Narrow the resolution bandwidth from 1 MHz to 100 kHz and increase the video bandwidth to 3 MHz still retaining the 60 microseconds s...

Страница 145: ... the calibration accuracy of spectrum analyzers you can reliably use these procedures in the cable headend environment Measuring the RF Signal at the Forward Test Point on a Laser Transmitter This section describes RF signal measurements that should be taken with a spectrum analyzer at the downstream forward test point on the fiber optic laser transmitter See Figure 4 14 on page 4 15 for the locat...

Страница 146: ...he Laser Transmitter Video Channel Display Step 3 Select the carrier level or amplitude function Figure 4 58 shows the detailed display of the analog carrier level and frequency screen for the channel 48 in this example Figure 4 58 Downstream Forward Test Point on the Laser Transmitter Detailed Video Channel Display Step 4 Return to the main menu on your spectrum analyzer Step 5 Select a digital c...

Страница 147: ...yzer and advance the screen displays next screen until the digital channel power display is shown See Figure 4 60 Figure 4 60 Downstream Forward Test Point on the Laser Transmitter Digital Channel Power Display Note The 3 6 dBmV digital power rating is nearly the same as the previously measured video carrier level 4 3 dBmV This value is too high to provide reliable digital data transmission Step 7...

Страница 148: ...mmend installing a Cisco uBR900 series cable access router at the headend to verify the digital data configuration For instructions on how to install a Cisco uBR900 series access router refer to the installation and configuration guides for the Cisco uBR900 series access router that you are using at the following URL https www cisco com en US products hw cable ps2221 tsd_products_support_install_a...

Страница 149: ...either the upstream or downstream path clipping may occur Laser clipping leads to degraded signal integrity In minor doses this signal damage is not immediately visible on an analog video signal but it can completely disrupt the digital transmission path That is digital signals are more sensitive to clipping than analog signals and will more readily display the negative effects of laser clipping I...

Страница 150: ...4 54 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Chapter 4 Connecting the Cisco uBR7200 Series Router to the Cable Headend Configuring the Digital Signal ...

Страница 151: ... This function allows you to install and replace the same type of port adapters Cisco PA POS OC3 with a Cisco PA POS OC3 or cable interface line cards Cisco uBR MC16C with a Cisco uBR MC16C while the router is operating Note However to replace a port adapter or a cable interface line card with a different type of port adapter or line card for example hot swapping from an Cisco uBR MC16C to a Cisco...

Страница 152: ...ves them When you remove or insert a port adapter or cable interface line card in a Cisco uBR7200 series router the midplane pins send signals to notify the system which then does the following 1 Rapidly scans the midplane for configuration changes 2 Initializes all newly inserted port adapters and cable interface line cards noting any removed interfaces and placing them in the administratively sh...

Страница 153: ...mpts to restart itself within 90 seconds to clear the temperature condition Power supply shutdown The power supply detected an internal out of tolerance overvoltage overcurrent or temperature condition and shut itself down The power supply repeatedly attempts to restart itself within 90 seconds to clear the shutdown condition Table 5 1 lists the temperature thresholds for the processor monitored l...

Страница 154: ... is either within tolerance normal or out of tolerance critical as shown in Table 5 2 If an internal power supply temperature or voltage reaches a critical level the power supply shuts down without any interaction with the system processor Reporting Functions The Cisco uBR7200 series router displays warning messages on the console if chassis interface monitored parameters exceed a desired threshol...

Страница 155: ...rieves and displays the NVRAM log which shows the reason for the last system shutdown if the shutdown was related to voltage or temperature and the environmental status at that time Air temperature is measured and displayed and the DC voltage supplied by the power supply is also displayed Following is sample output of the show environment last command for a Cisco uBR7246 Router show environment la...

Страница 156: ... Note Temperature ranges and values are subject to change Note The example above is specific to the Cisco uBR7246 and you might notice a difference in the output for your Cisco uBR7246VXR The show environment all command displays an extended report that includes temperature readings and voltage readings The show environment all command also displays a report showing which power supply slots are oc...

Страница 157: ...sc cbl_12_2sc_book html Configuration Fundamentals Command Reference at the following URL http www cisco com en US docs ios 12_2 configfun command reference ffun_r html Flash Memory Card This section covers insertion removal and formatting of flash memory cards in the Cisco uBR7200 series universal broadband router The I O controller has two Personal Computer Memory Card International Association ...

Страница 158: ...udes from the I O controller faceplate Do not attempt to force the card past this point Removing a Flash Memory Card To remove a flash memory card from either PCMCIA slot Step 1 Press the ejector button on the slot See c in Figure 5 2 Step 2 Grasp the card and pull it from the slot Step 3 Place the card in an antistatic bag Figure 5 2 Removing a Flash Memory Card EJECT SLOT 1 SLOT 0 ENABLED a b c ...

Страница 159: ...ed carefully If you want to save the data on a flash memory card copy the data to a server before you format the card Note The following procedure assumes you have already booted your Cisco uBR7200 series router To format a new flash memory card Step 1 Using the procedure described in the Installing a Flash Memory Card section on page 5 7 insert the flash memory card into slot 0 If slot 0 is not a...

Страница 160: ...y card Step 1 Boot the router and allow it to initialize Step 2 Insert an unformatted flash memory card and format it using the procedure in the Formatting a New Flash Memory Card section on page 5 9 Then proceed to Step 3 Note If you have already formatted a flash memory card you can use it instead however you cannot boot from a flash memory card that was formatted on another type of system You m...

Страница 161: ...ry card in slot 0 with the old image For this scenario the filenames are as follows The new image on the new flash memory card is new image The old image on the flash memory card in slot 0 is old image The bootable image in onboard flash memory is boot image You will copy the new image from the new flash memory card onto the flash memory card that contains the old image Not Enough Memory on the Fl...

Страница 162: ...oot system flash slot0 new image Router config z Router copy running config startup config Router reload When the system reloads it boots the file new image from the flash memory card in slot 0 Reformatting a Flash Memory Card Depending on the circumstances you might need to use a flash memory card from another system to copy images or back up configuration files however you cannot boot from a fla...

Страница 163: ... all the files on the flash memory card to a TFTP server or a secondary flash memory card The following example is for copying files to a TFTP server Refer to the Copying a Bootable Image onto a Flash Memory Card section on page 5 10 for flash memory card examples Router enable Password password Router copy slot0 image name tftp Enter destination file name image name image name CCCCCCCCCCCCCCCCCCC...

Страница 164: ...5 14 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Chapter 5 Maintaining the Cisco uBR7200 Series Router Flash Memory Card ...

Страница 165: ...this flow chart as necessary and follow the steps to isolate hardware problems to a specific subsystem For cable specific commands for Cisco uBR7200 series universal broadband routers refer to the Cisco IOS CMTS Cable Command Reference Guide at the following URL http www cisco com en US docs ios cable command reference cbl_book html Resolve the problem if possible or contact the Cisco Technical As...

Страница 166: ... Includes the I O controller network processing engine all port adapters the cable clock card and cable interface line cards The system memory and management functions reside on the I O controller and the network processing engine The enabled LED on each port adapter or cable interface line card indicates if the port adapter or cable interface line card is initialized Turn on system power DC OK LE...

Страница 167: ... states in the startup sequence By checking the state of the LEDs you can determine when and where the system failed in the startup sequence Note On rare occasions an LED may be faulty Use the following descriptions to isolate the problem to a subsystem then proceed to the appropriate sections to try to resolve the problem When you start up the system by turning on the power supply switch the foll...

Страница 168: ...A slot is in use During a successful boot these LEDs come on and remain on if a flash memory card is present in the slot These LEDs also blink when either slot is being accessed by the system These LEDs do not indicate startup problems 4 The enabled LED on each port adapter comes on when the network processing engine completes its initialization of the port adapter for operation The enabled LED in...

Страница 169: ...d c Turn the switch back on Step 5 If the power OK LED comes on return the first power cable for replacement Contact a service representative for further instructions Step 6 If the LED still fails to come on when the power supply is connected to a different power source with a new power cable the power supply is probably faulty a If a second power supply is available and your Cisco uBR7200 series ...

Страница 170: ...page 2 6 and the Equipment Racks section on page 2 17 for preventive site configurations Processor Subsystem The processor subsystem is comprised of the I O controller the network processing engine all port adapters the clock card Cisco uBR7246VXR and all cable interface cards The I O controller and network processing engine are required system components The system cannot operate unless the I O c...

Страница 171: ...rmal operation Contact Cisco TAC for instructions Troubleshooting the Network Processing Engine Check the following to help isolate a problem with the network processing engine NPE Step 1 If the I O controller enabled LED does not go on as expected a Turn off the power to the router b Reseat the network processing engine in its slot c Restart the router Step 2 Verify that you are running a version...

Страница 172: ...y your particular Cisco uBR7200 series router chassis a Use the show diag command to determine the type of port adapter that is installed in your router b Consult the port adapter support matrix in the Cisco uBR7200 Series Software Configuration Guide at the following URL http www cisco com en US docs cable cmts ubr7200 configuration guide cr72scg html c If the router does not respond to the conso...

Страница 173: ... card enabled LEDs are off a If the enabled LED on an individual cable interface line card is off check to see if the cable interface line card has pulled away from the midplane b Reseat the cable interface line card in its slot You do not have to turn off the system power when removing or replacing cable interface line cards c After the system reinitializes the interfaces the enabled LED on the c...

Страница 174: ...200 series router to the console See the Console and Auxiliary Port Connection Equipment section on page 3 16 Set up the console See the Cisco uBR7200 Series Software Configuration Guide at the following URL http www cisco com en US docs cable cmts ubr7200 configuration guide cr72scg html To verify the downstream signal originating from the Cisco uBR7200 series router Step 1 When the Cisco uBR900 ...

Страница 175: ...to 10 dB below the level of the analog TV channels f Make sure that the digitally modulated carrier s RF average power level is in the 15 dBmV to 15 dBmV range at the input to the cable router Note The exact value displayed will vary from cable interface to cable interface however the values collected from measurement to measurement on the same router will be consistent Step 3 If the previous step...

Страница 176: ...6 12 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Chapter 6 Troubleshooting About Verifying the Downstream Signal ...

Страница 177: ...twork processing engine I O controller 2 port adapters 4 cable modem cards 2 power supplies and a fan tray 100 lb 45 4 kg Heat dissipation 800W1 2730 Btu2 AC input power 800W maximum with either a single or dual power supply configuration Maximum AC input voltage 100 to 240 VAC3 wide input with power factor correction AC input current rating 7A4 maximum at 110 VAC and 3 5A maximum at 240 VAC with ...

Страница 178: ...rsion of Cisco IOS Release 12 0 SC 12 0 10 SC1 or later version of Cisco IOS Release 12 0 SC1 12 0 9 SC or later version of Cisco IOS Release 12 0 SC 12 0 8 SC1 or later version of Cisco IOS Release 12 0 SC1 12 0 7 SC or later version of Cisco IOS Release 12 0 SC 12 0 7 XR3 or later version of Cisco IOS Release 12 0 XR 12 0 7 XR2 or later version of Cisco IOS Release 12 0 XR 12 0 6 SC or later ver...

Страница 179: ...er 800W maximum with either a single or dual power supply configuration Maximum AC input voltage 100 to 240 VAC3 wide input with power factor correction AC input current rating 7A4 maximum at 110 VAC and 3 5A maximum at 240 VAC with the chassis fully configured AC input cable 18 AWG5 three wire cable with a three lead IEC 320 receptacle on the power supply end and a country dependent plug on the p...

Страница 180: ...o IOS Release 12 0 SC 12 0 10 SC1 or later version of Cisco IOS Release 12 0 SC1 12 0 9 SC or later version of Cisco IOS Release 12 0 SC 12 0 8 SC1 or later version of Cisco IOS Release 12 0 SC1 12 0 7 SC or later version of Cisco IOS Release 12 0 SC 12 0 7 XR3 or later version of Cisco IOS Release 12 0 XR 12 0 7 XR2 or later version of Cisco IOS Release 12 0 XR 12 0 7 T or later version of Cisco ...

Страница 181: ...d October 1993 CableLabs1 Two Way Cable Television System Characterization Cable Television Laboratories Inc April 12 1995 CableLabs2 Digital Transmission Characterization of Cable Television Systems Cable Television Laboratories Inc November 1999 Note Raw data rate in Table B 1 and Table B 2 includes nominal data throughput plus overhead Table B 1 Downstream Channel Data Rates Modulation Format C...

Страница 182: ...normal downstream operating range is from 50 MHz to as high as 860 MHz However the values in this table apply only at frequencies 88 MHz RF channel spacing design bandwidth 6 MHz Transit delay from headend to most distant customer 0 800 msec typically much less Carrier to noise ratio in a 6 MHz band analog video level Not less than 35 dB2 Carrier to interference ratio for total power discrete and ...

Страница 183: ...Table B 3 DOCSIS 1 0 Assumed Downstream RF Channel Transmission Characteristics continued Parameter Value Table B 4 DOCSIS 1 0 Assumed Upstream RF Channel Transmission Characteristics Parameter Value Frequency range 5 to 42 MHz edge to edge Transit delay from the most distant cable modem to the nearest cable modem or CMTS 0 800 msec typically much less Carrier to noise ratio Not less than 25 dB Ca...

Страница 184: ... frequencies 88 MHz RF channel spacing design bandwidth 6 MHz Transit delay from headend to most distant customer 0 800 msec typically much less Carrier to noise ratio in a 6 MHz band Not less than 35 dB1 1 Measured relative to a QAM signal that is equal to the nominal video level in the plant Carrier to composite triple beat distortion ratio Not less than 41 dB1 Carrier to composite second order ...

Страница 185: ...ant cable modem to the nearest cable modem or CMTS 0 800 msec typically much less Carrier to interference plus ingress the sum of noise distortion common path distortion and cross modulation and the sum of discrete and broadband ingress signals impulse noise excluded ratio Not less than 25 dB1 1 Ingress avoidance or tolerance techniques may be used to ensure operation in the presence of time varyi...

Страница 186: ...interference ratio for total power discrete and broadband ingress signals Not less than 52 dB within the design bandwidth Composite triple beat distortion for analog modulated carriers PAL Not greater than 57 dBc within the design bandwidth SECAM Not greater than 52 dBc within the design bandwidth Composite second order distortion for analog modulated carriers PAL Not greater than 57 dBc within th...

Страница 187: ...to ensure operation in the presence of time varying discrete ingress signals that could be as high as 0 dBc Carrier to interference the sum of noise distortion common path distortion and cross modulation ratio in active channel Not less than 22 dB Carrier hum modulation Not greater than 23 dBc 7 Burst noise Not longer than 10 microsecond at a 1 kHz average rate for most cases2 3 2 Amplitude and fr...

Страница 188: ...return loss DOCSIS 6 dB 88 860 MHz EuroDOCSIS 6 dB 85 862 MHz Connector F connector per ISO 169 24 common with the output Table B 10 Upstream Electrical Output from the Cable Modem Parameters Value Frequency DOCSIS 5 to 42 MHz edge to edge EuroDOCSIS 5 to 65 MHz edge to edge Level range one channel QAM 16 8 to 55 dBmV 68 to 115 dBmicroV QPSK 8 to 58 dBmV 68 to 118 dBmicroV Modulation type QPSK and...

Страница 189: ...d the connector should be securely crimped to the cable The following headend cables are recommended 59 series cable preferred 20 AWG 0 032 inch 0 81 mm diameter silver plated copper clad steel center conductor bonded foil inner shield 95 percent braid second shield nonbonded foil third shield 95 percent braid fourth shield 59 series quad shield 20 AWG 0 032 inch 0 81 mm diameter copper clad steel...

Страница 190: ...l proximity Console and Auxiliary Port Cables and Pinouts The router arrives with a console and auxiliary cable kit which contains the cable and adapters you need to connect a console an ASCII terminal or PC running terminal emulation software or modem to the router The console and auxiliary cable kit includes RJ 45 to RJ 45 rollover cable RJ 45 to DB 9 female data terminal equipment DTE adapter l...

Страница 191: ...bles and Pinouts Use the RJ 45 to RJ 45 rollover cable and RJ 45 to DB 9 female DTE adapter labeled TERMINAL to connect the console port to a PC running terminal emulation software Table C 1 lists the signals and pinouts for the asynchronous serial console port the RJ 45 to RJ 45 rollover cable and the RJ 45 to DB 9 female DTE adapter Pin 1 Pin 8 H3824 Pin 1 and pin 8 should be the same color Tabl...

Страница 192: ...ry 3 UTP straight through cable when connecting to a PC or other Ethernet device Use a Category 5 UTP crossover cable when connecting 100Base TX to a hub Use a Category 5 UTP straight through cable when connecting to a PC or other Ethernet device Note Cisco Systems does not supply Category 3 or Category 5 UTP RJ 45 cables these cables are available commercially Identifying an RJ 45 Crossover Cable...

Страница 193: ...the two modular ends of the cable Hold the cables side by side with the tab at the back The straight through cable s wires are in the same sequence at both ends of the cable Figure C 4 RJ 45 Straight Through Cable Identification Note If your cable was purchased from Cisco Systems pin 1 is white Table C 3 lists the pinouts for the two Fast Ethernet ports 62741 Pin 1 Pin 2 Pin 3 Pin 6 62740 Pin 1 Pi...

Страница 194: ...n general multimode cables are gray or orange and single mode cables are yellow For SONET or synchronous digital hierarchy SDH single mode and multimode fiber optic connections use one duplex SC type connector Figure C 5 or two simplex SC type connectors See Figure C 6 Figure C 5 Duplex SC Cable Connector Figure C 6 Simplex SC Cable Connector Attach either one duplex fiber cable or two simplex fib...

Страница 195: ...requency or channel locations not separate channels For proper testing of the network more downstream test points are required In addition upstream test points of calibrated signal amplitude are becoming essential Note Several third party companies have available commercially manufactured equipment that includes fixed or modular splitters combiners and test points for headend RF management Many co...

Страница 196: ...ial Building Telecommunications Cabling Standard TIA EIA 569A Commercial Building Standard for Telecommunications Pathways and Spaces TIA EIA 570A Residential Telecommunications Cabling Standard TIA EIA 598 Optical Fiber Cable Color Coding TIA EIA 606 The Administration Standard for the Telecommunications Infrastructure of Commercial Buildings TIA EIA 607 Commercial Building Grounding and Bonding ...

Страница 197: ...olor Codes To help simplify wire management AT T has devised a uniform scheme for dealing with large numbers of wires for the telephone industry The scheme uses two color codes one for large numbers of wires organized in pairs and the other for smaller numbers of wires that can also be organized in pairs Cisco recommends that you try to implement this wiring scheme whenever possible For large numb...

Страница 198: ... Green White 3 4 1 White Brown 29 4 2 Brown White 4 5 1 White Slate 30 5 2 Slate White 5 6 1 Red Blue 31 6 2 Blue Red 6 7 1 Red Orange 32 7 2 Orange Red 7 8 1 Red Green 33 8 2 Green Red 8 9 1 Red Brown 34 9 2 Brown Red 9 10 1 Red Slate 35 10 2 Slate Red 10 11 1 Black Blue 36 11 2 Blue Black 11 12 1 Black Orange 37 12 2 Orange Black 12 13 1 Black Green 38 13 2 Green Black 13 14 1 Black Brown 39 14 ...

Страница 199: ...hree pairs of the standard color code white blue blue white and so on while other times it uses the six alternate color wires 19 1 Yellow Brown 44 19 2 Brown Yellow 19 20 1 Yellow Slate 45 20 2 Slate Yellow 20 21 1 Violet Blue 46 21 2 Blue Violet 21 22 1 Violet Orange 47 22 2 Orange Violet 22 23 1 Violet Green 48 23 2 Green Violet 23 24 1 Violet Brown 49 24 2 Brown Violet 24 25 1 Violet Slate 50 2...

Страница 200: ...D 6 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Appendix D Industry Standard Wiring Plans Telephone Wire Color Codes ...

Страница 201: ...s 4 3 PAL Phase Alternating Line PAL is a composite color system similar to NTSC In PAL however the color difference signals alternate phase at the horizontal line rate PAL video consists of a 625 line frame a frame rate of 25 Hz and a field rate of 50 Hz As with NTSC approximately 8 percent of the available bandwidth is used for synchronization yielding an effective resolution of 768x576 The aspe...

Страница 202: ...9 94 50 50 50 50 50 50 50 Horizontal rate Hz Monochrome 15 750 Color 15 734 264 15 625 15 625 15 625 15 625 15 625 15 625 15 625 Video bandwidth Mhz 4 2 4 2 5 5 5 5 6 6 6 Table E 2 Analog Television Chrominance Sub Carrier Frequencies M NTSC M PAL B B1 D D1 G H K N PAL I PAL N PAL1 1 This value applies to the combination N PAL used in Argentina B D G H K K1 L SECAM Chrominance sub carrier frequenc...

Страница 203: ... 0 66 0 61 25 63 0 65 75 61 2625 65 7625 60 0030 64 5030 4 4 66 0 72 0 67 25 69 0 71 75 67 2625 71 7625 66 0033 70 5030 5 5 76 0 82 0 77 25 79 0 81 75 79 2625 83 7625 78 0039 82 5039 6 6 82 0 88 0 83 25 85 0 87 75 85 2625 89 7625 84 0042 88 5042 FM 88 0 108 0 A 5 95 90 0 96 0 91 25 93 0 95 75 91 2625 95 7625 90 0045 94 5045 A 4 96 96 0 102 0 97 25 99 0 101 75 97 2625 101 7625 96 0048 100 5048 A 3 ...

Страница 204: ...25 276 0138 270 5138 U 342 282 0 288 0 283 25 285 0 287 75 283 2625 287 7625 282 0141 286 5141 V 352 288 0 294 0 289 25 291 0 293 75 289 2625 293 7625 288 0144 292 5144 W 362 294 0 300 0 295 25 297 0 299 75 295 2625 299 7625 294 0147 298 5147 AA 372 300 0 306 0 301 25 303 0 305 75 301 2625 305 7625 300 0150 304 5150 BB 382 306 0 312 0 307 25 309 0 311 75 307 2625 311 7625 306 0153 310 5153 CC 392 ...

Страница 205: ... 489 0 491 75 487 2625 491 7625 486 0243 490 5243 69 492 0 498 0 493 25 495 0 497 75 493 2625 497 7625 492 0246 496 5246 70 498 0 504 0 499 25 501 0 503 75 499 2625 503 7625 498 0249 502 5249 71 504 0 510 0 505 25 507 0 509 75 505 2625 509 7625 504 0252 508 5252 72 510 0 516 0 511 25 513 0 515 75 511 2625 515 7625 510 0255 514 5255 73 516 0 522 0 517 25 519 0 521 75 517 2625 521 7625 516 0258 520 ...

Страница 206: ... 701 7625 696 0348 700 5348 109 702 0 708 0 703 25 705 0 707 75 703 2625 707 7625 702 0351 706 5351 110 708 0 714 0 709 25 711 0 713 75 709 2625 713 7625 708 0354 712 5354 111 714 0 720 0 715 25 717 0 719 75 715 2625 719 7625 714 0357 718 5357 112 720 0 726 0 721 25 723 0 725 75 721 2625 725 7625 720 0360 724 5360 113 726 0 732 0 727 25 729 0 731 75 727 2625 731 7625 726 0363 730 5363 114 732 0 73...

Страница 207: ...904 5450 143 906 0 912 0 907 25 909 0 911 75 907 2625 911 7625 906 0453 910 5453 144 912 0 918 0 913 25 915 0 917 75 913 2625 917 7625 912 0456 916 5456 145 918 0 924 0 919 25 921 0 923 75 919 2625 923 7625 918 0459 922 5459 146 924 0 930 0 925 25 927 0 929 75 925 2625 929 7625 924 0462 928 5462 147 930 0 936 0 931 25 933 0 935 75 931 2625 935 7625 930 0465 934 5465 148 936 0 942 0 937 25 939 0 94...

Страница 208: ...8 0 204 0 199 25 201 00 203 75 10 204 0 210 0 205 25 207 00 209 75 11 210 0 216 0 211 25 213 00 215 75 12 216 0 222 0 217 25 219 00 221 75 C13 108 0 114 0 109 25 111 00 113 75 C14 114 0 120 0 115 25 117 00 119 75 C15 120 0 126 0 121 25 123 00 125 75 C16 126 0 132 0 125 25 129 00 131 75 C17 132 0 138 0 133 25 135 00 137 75 C18 138 0 144 0 139 25 141 00 143 75 C19 144 0 150 0 145 25 147 00 149 75 C2...

Страница 209: ...4 0 360 0 355 25 357 00 359 75 C46 360 0 366 0 361 25 363 00 365 75 C47 366 0 372 0 367 25 369 00 371 75 C48 372 0 378 0 373 25 375 00 377 75 C49 378 0 384 0 379 25 381 00 383 75 C50 384 0 390 0 385 25 387 00 389 75 C51 390 0 396 0 391 25 393 00 395 75 C52 396 0 402 0 397 25 399 00 401 75 C53 402 0 408 0 403 25 405 00 407 75 C54 408 0 414 0 409 25 411 00 413 75 C55 414 0 420 0 415 25 417 00 419 75...

Страница 210: ...allocation table for PAL B and G locations Also note that some countries use different schemes for VHF and UHF More information can be found at the Websites listed on page E 1 Note The downstream frequency plan includes all center frequencies between 112 and 858 MHz on 250 kHz increments It is up to the operator to decide which frequencies to use to meet national and network requirements Table E 6...

Страница 211: ...342 0 335 25 340 75 S26 342 0 350 0 343 25 348 75 S27 350 0 358 0 351 25 356 75 S28 358 0 366 0 359 25 364 75 S29 366 0 374 0 367 25 372 05 S30 374 0 382 0 375 25 380 75 S31 382 0 390 0 383 25 388 75 S32 390 0 398 0 391 25 396 75 S33 398 0 406 0 399 25 404 75 S34 406 0 414 0 407 25 412 75 S35 414 0 422 0 415 25 420 75 S36 422 0 430 0 423 25 428 75 S37 430 0 438 0 431 25 436 75 S38 438 0 446 0 439 ...

Страница 212: ...0 622 0 615 25 620 75 40 622 0 630 0 623 25 628 75 41 630 0 638 0 631 25 636 75 42 638 0 646 0 639 25 644 75 43 646 0 654 0 647 25 652 75 44 654 0 662 0 655 25 660 75 45 662 0 670 0 663 25 668 75 46 670 0 678 0 671 25 676 75 47 678 0 686 0 679 25 684 75 48 686 0 694 0 687 25 692 75 49 694 0 702 0 695 25 700 75 50 702 0 710 0 703 25 708 75 51 710 0 718 0 711 25 716 75 52 718 0 726 0 719 25 724 75 5...

Страница 213: ... 798 0 791 25 796 75 62 798 0 806 0 799 25 804 75 63 806 0 814 0 807 25 812 75 64 814 0 822 0 815 25 820 75 65 822 0 830 0 823 25 828 75 66 830 0 838 0 831 25 836 75 67 838 0 846 0 839 25 844 75 68 846 0 854 0 847 25 852 75 69 854 0 862 0 855 25 860 75 Table E 6 Cable Television Channels and Relative Frequencies PAL B and G continued Channel Number Bandwidth MHz Visual Carrier MHz Aural Carrier MH...

Страница 214: ...E 14 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Appendix E Frequency Allocation Tables PAL SECAM Cable Television Channels and Relative Frequencies ...

Страница 215: ...r1 Website or Phone Number Products Model Upconverters Barco2 http www barco com Gemini Motorola3 http www gi com CDCM2000 Scientific Atlanta http www sciatl com Continuum 9860 9861 Vecima Electronics http www vecima com HD4040 MA4040 Diplex Filters Eagle Comtronics http www eaglecomtronics com Diplex filters Microwave Filter Company Inc http www microwavefilter com Diplex filters PCI Technologies...

Страница 216: ...upconverter 3 Formerly General Instrument 4 Formerly Hewlett Packard Test and Measurement Division Table F 1 Manufacturers for North American Headend Provisioning Requirements continued Manufacturer1 Website or Phone Number Products Model Table F 2 Manufacturers for North American Headend Measurement Devices Manufacturer Website or Phone Number Products Model Digital Signal Level Meters QAM Analyz...

Страница 217: ...om Gemini Motorola3 3 Formerly Gerneral Instrument http www gi com CDCM2000 Scientific Atlanta http www sciatl com Continuum Vecima Electronics http www vecima com HD4040 MA4040 Diplex Filters Eagle Comtronics http www eaglecomtronics com Diplex filters Microwave Filter Company Inc http www microwavefilter com Diplex filters PCI Technologies http www atxnetworks com Diplex filters Viewsonics http ...

Страница 218: ...ly Hewlett Packard Test and Measurement Division http www tm agilent com Agilent 8594Q N1776A Sunrise Telecom2 2 Formerly Hukk Engineering and Avantron http www sunrisetelecom com broadband AT2000RQ Swires Research http www swire com TVA 2000 Q Telsey3 3 Formerly Tektronics DMA division http www telsey it DMA121 DMA122 Trilithic http www trilithic com 860DSP w Option QA1 Spectrum Analyzers Agilent...

Страница 219: ...g as a record of system maintenance and expansion history Each time a procedure is performed on the system update the site log to reflect the following Port adapters installed removed or replaced Cisco cable clock card installed removed or replaced Cisco uBR7246VXR router Cable interface line cards installed removed or replaced I O controller removed and replaced Network processing engine removed ...

Страница 220: ...G 2 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 Appendix G Site Log Table G 1 Site Log Date Description of Action Performed or Symptom Observed Initials ...

Страница 221: ...not exceed 1804 feet 550 meters in length over multimode fiber or 32 810 feet 10 km in length over single mode fiber Based on the IEEE 802 3 standard with reach over single mode fiber extended from 5 km to 10 km 1000Base SX 1000 Mbps Gigabit Ethernet specification using two strands of multimode fiber optic cable per link To guarantee proper signal recovery a 1000Base SX link cannot exceed 1804 fee...

Страница 222: ...ive Committee for International Telegraph and Telephone International organization responsible for the development of communications standards Now called the ITU T See ITU T CCS Common channel signaling CES Circuit emulation service Chrominance The color portion of a video signal CMTS Cable modem termination system such as the Cisco uBR7246VXR router C N ratio Carrier to noise ratio CNR Cisco Netw...

Страница 223: ...d of a user network interface that serves as a data source destination or both DTE connects to a data network through a DCE device for example a modem and typically uses clocking signals generated by the DCE DTE includes devices such as computers protocol translators and multiplexers E EIA Electronic Industries Alliance EIA TIA 232 E The latest version of the RS 232 C serial data transfer standard...

Страница 224: ...cal signals to the transmission medium s physical layer signalling which is typically optical GBIC modules can be hot swapped and contain ID and system information that a switch or router can use to determine the network device s capabilities Different GBICs handle different types of fiber cable See 1000Base LX LH 1000Base SX and 1000Base ZX GPS Global positioning system H H 323 VoIP network Proto...

Страница 225: ... the reporting node You can use the show facility alarm status IOS command to obtain more information about the problem See also Critical alarm and Minor alarm MDC MII data clock MDIO MII data input output MER Modulation error ratio MIGC Manual IF gain control Minor alarm One of a group of alarm conditions that are considered the third most severe of all reportable alarms Minor alarms affect a sin...

Страница 226: ...O OIR Online insertion and removal OTP One time programmable P PA Port adapter PAL Phase alternate line PCI Protocol control information PCMCIA Personal Computer Memory Card International Association Q QAM Quadrature amplitude modulation A modulation technique using variations in simple amplitude QPSK Quaternary phase shift keying A compression technique used in modems and wireless networks R RG 5...

Страница 227: ...specification developed by Bellcore and designed to run on optical fiber STS 1 is the basic building block of SONET It was approved as an international standard in 1988 SR Short reach SONET SDH specification for transmit power and receive sensitivity that achieves a 1 2 mile 2 km reach SRAM Static Random Access Memory SRP Spatial reuse protocol STB Set top box T T1 Digital WAN carrier facility T1 ...

Страница 228: ... based on logical instead of physical connections they are extremely flexible VoIP Voice over IP VPN Virtual private network VXR Voice Extension Ready W WAN Wide area network A data communications network that serves users across a broad geographic area and often uses transmission devices provided by a common carrier such as a telephone company or service provider X X level test point A test point...

Страница 229: ...agement bracket 4 post rack 3 6 how to install 3 6 3 7 3 8 3 10 requirements 3 5 cable management kit using 2 19 cable network configurations overview 1 8 cables AC power 1 22 Category 3 or 5 UTP C 4 connecting 3 15 console port C 3 crossover C 4 C 5 Fast Ethernet ports C 4 interference 2 16 line loss 4 4 return loss C 2 rollover C 2 safety guidelines 2 4 straight through C 4 C 5 swapping power 6 ...

Страница 230: ...ypical cable headend 4 2 4 3 configuring the console port 3 17 connecting to power 3 21 3 22 3 23 connection equipment auxiliary port signals 3 18 console and auxiliary 3 16 console port signals 3 17 Fast Ethernet MII 3 18 console port PRE module C 3 console terminal system banner display 6 4 cooling subsystem 6 2 copy commands 5 10 5 12 critical status level environmental monitor 5 4 crossover ca...

Страница 231: ... show environment command output 5 5 show environment last command output 5 5 exhaust air 5 5 F fan failures 5 7 fan tray 1 2 1 23 1 24 1 25 Fast Ethernet 1 6 1 16 C 4 fiber optic laser receivers 2 13 field notices 6 9 field replaceable units see FRUs 1 12 filler panels 2 7 flash memory card 1 16 formatting a new flash memory card 5 9 memory options 1 28 physical description 1 27 replacement instr...

Страница 232: ...8 input level 4 5 measuring the signal 4 17 to 4 19 output level 4 4 impulse noise 4 3 ingress noise 4 3 insertion loss 4 15 installation analyze the RF 4 1 before you begin 2 8 checking the shipping container 2 11 checklist 3 1 connecting cables 3 14 3 15 connecting power 3 21 electrical safety 2 2 equiipment 2 9 ESD 2 4 general 3 13 headend setup 4 1 initial configuration information 2 7 lifting...

Страница 233: ...4 impulse 4 3 ingress 4 3 outside plant 4 40 phase noise measurement 4 10 upconverter 4 8 normal status level environmental monitor 5 4 5 5 note description of 1 xi NTSC M frequency allocations E 8 NTSC frequency allocation E 3 NTSC standard description E 1 NVRAM log 5 3 O offset 4 13 OIR 1 2 5 1 online insertion and removal see OIR operating conditions for chassis A 1 out of tolerance temperature...

Страница 234: ... 1 3 current rating 1 22 filler panel 2 7 LEDs 1 22 6 3 physical description 1 21 shutdown 5 3 troubleshooting 6 3 wire gauge 1 22 2 2 preamble power 4 42 prepare for two way data operation 2 11 problem solving subsystem 6 2 procedures checking the shipping container 2 11 connecting clock card cables 3 15 connecting I O controller cables 3 15 connecting interface card cables 3 15 connecting port a...

Страница 235: ...acks 2 17 general precautions 2 6 plant wiring 2 16 power considerations 2 7 slot port numbers for interfaces 1 5 SNMP management 1 13 specifications A 1 A 3 spectrum analyzer using CATV mode option 4 23 to channel power option 4 17 to 4 23 measure RF signal 4 17 to 4 29 spectrum analyzer manufacturers F 2 F 4 splitter manufacturers F 1 F 3 spurs 4 10 startup system 3 25 status 5 4 5 5 status envi...

Страница 236: ...onverters 2 12 upstream analyzing RF signal 4 37 to 4 40 connecting and configuring 4 30 to 4 33 measuring RF signal 4 34 to 4 40 upstream data burst 4 40 4 42 V variable transmit levels 4 4 vector signal analyzer manufacturers F 2 F 4 video averaging 4 18 voice over IP see VoIP VoIP 1 11 2 15 VPN example 1 10 W warning battery handling 2 2 chassis lifting 3 11 3 13 DC power disconnection 3 23 DC ...

Страница 237: ...Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 telephone 2 4 telephone color codes D 3 telephone station terminal color codes D 5 X X level test points 4 32 Z zero span 4 40 ...

Страница 238: ...Index IN 10 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide OL 5421 03 ...

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