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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide

OL-17309-01

Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Connecting and Configuring the Upstream

Figure 4-22

Connecting and Configuring the Upstream

Testing the Upstream Configuration

To test the upstream configuration, insert a test signal of known amplitude (+17 dBmV is shown in this
example) into the fiber node and measure the amplitude output level at the output of the headend’s
optical receiver. This measurement depends on return laser performance and optical distance. This
procedure is known as establishing the “X-level” test point. (See

Figure 4-23

.)

Figure 4-23

The “X-level” Test Point

Cisco

uBR7225VXR

271676

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 all

optical receivers (+/- 0.5 dB),

See Fig. 4-36 and Fig 4-37

X

Cable

modem

L H

C

Diplex filter

14045

Spectrum analyzer

Optical

receiver

Fiber node

0.5 milliwatt

Fiber node

1.0 milliwatt

Spectrum analyzer

Optical

receiver

1dB attenuator

+11 dBmV

X-level test point = +10 dBmV

(in this example)

30 km

10 km

+17 dBmV

17 dBmV signal

X

M10 dBmV at this point

17 dBmV signal

«
...
91
92
93
94
95
...
»

Содержание UBR7225VXR

Страница 1: ...uter 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 17309 0...

Страница 2: ...by 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 ...

Страница 3: ...view 1 4 Card Slot and Logical Interface Numbering 1 4 MAC Layer Address 1 5 Supported System Configurations Overview 1 6 Basic Internet Access Services 1 6 VPN Services 1 8 IP Telephony Services 1 8 Telco Return 1 9 Hardware Component Descriptions 1 10 Network Processing Engine 1 10 NPE Comparisons 1 11 Cisco Cable Interface Line Cards 1 12 Power Supplies 1 13 Fan Trays 1 14 Cisco uBR7225VXR Chas...

Страница 4: ...end 2 10 Two Way Data and VoIP 2 10 Headend Certification 2 11 Diplex Filters 2 11 Receivers 2 11 DHCP DNS TFTP and TD Servers 2 12 Telco Return 2 12 Dial Up Remote Access Servers 2 12 RADIUS Dial Security Servers 2 12 Authentication Authorization and Accounting Servers 2 13 VoIP Gateways and Gatekeepers 2 13 VoIP SGCP Pass Through 2 13 Headend Wiring 2 14 Interference Considerations 2 14 Distance...

Страница 5: ... Router to the Cable Headend 4 1 Two Way Data Headend Architecture 4 2 One Way Data Headend Architecture 4 3 RF and Digital Data Overview 4 3 Connecting and Configuring the Downstream 4 4 Installing and Configuring the Upconverter 4 4 Measuring the Downstream RF Signal 4 4 Measuring the Downstream RF Signal Using the Channel Power Option on a Spectrum Analyzer 4 5 Measuring the Downstream IF Signa...

Страница 6: ...em 6 5 Troubleshooting the Network Processing Engine 6 5 Troubleshooting Cable Interface Line Cards 6 6 Other Troubleshooting Information Websites 6 7 Verifying the Downstream Signal 6 7 A P P E N D I X A Cisco uBR7225VXR Router Specifications A 1 Cisco uBR7225VXR Physical and System Specifications A 1 A P P E N D I X B RF Specifications B 1 DOCSIS 1 0 Transmission Characteristics B 2 Downstream R...

Страница 7: ...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 2 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 Frequencies for Japan E 8 P...

Страница 8: ...Contents viii Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 ...

Страница 9: ...equest 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 uBR7225VXR universal broadband router The guide contains procedures to unpack install and connect the Cisco uBR7225VXR router hardware that enables your cable television CATV headend ...

Страница 10: ...fety considerations tools and other equipment required to prepare your site Chapter 3 Installing the Cisco uBR7225VXR Router Installing the chassis and connecting the power and network interface cables Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend Connecting the Cisco uBR7225VXR router to a hybrid fiber coaxial HFC network and configuring and measuring downstream and upstre...

Страница 11: ...on guide cr72scg html Commands and keywords are in boldface font Arguments for which you supply values are in italic font Elements 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 fon...

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: ...CUREZZA 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 traduzi...

Страница 14: ...ncontrará 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 vanl...

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 elek...

Страница 16: ...xvi Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Preface ...

Страница 17: ...rmation 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 uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Preface ...

Страница 19: ...elevision network and presents that traffic to local and remote IP hosts For cable plants not fully upgraded to support two way cable transmission the router works in conjunction with dial up access products to support upstream traffic from DOCSIS based cable interfaces connected to the Public Switched Telephone Network PSTN The router supports both 6 MHz North American channel plans using ITU T J...

Страница 20: ...standard 19 inch equipment rack or telco type rack The Cisco uBR7225VXR universal broadband router supports Environmental monitoring and reporting functions to resolve adverse environmental conditions before loss of operation Online insertion and removal OIR allowing key system components to be added or removed without powering off the chassis Caution You can remove and replace a cable interface l...

Страница 21: ...wer requirements and maintains normal operation without interruption The power supply has the router s main power switch and an AC input power receptacle Mounting holes for a ground lug are located on the far right side on the rear of the chassis to provide a chassis ground connection for ESD preventive equipment See Figure 3 13 on page 3 16 Note Figure 1 2 shows the rear of a Cisco uBR7225VXR rou...

Страница 22: ...ther other cable interface line cards are installed or removed However when you move a cable interface line card to a different slot the logical interface number changes to reflect the new slot number The MAC layer or hardware address is a standardized data link layer address that is required for certain network interface types These addresses are specific and unique to each port The Cisco uBR7225...

Страница 23: ...dress is reserved for a specific slot in the router regardless of whether a cable interface line card resides in that slot The MAC addresses are assigned to the slots in sequence This address scheme allows you to remove cable interface cards and insert them into other universal broadband routers without causing the MAC addresses to move around the network or be assigned to multiple devices Note St...

Страница 24: ...5 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 Internet Access Services A Cisco uBR7225VXR universal broadband router is installed at the headend or distribution hub The Cisco uBR7225VXR downstream cable interface ...

Страница 25: ...modems Leveraging the extensibility of CNR CSRC enables and administers subscriber self registration The directory enabled architecture of CSRC allows it to integrate with Lightweight Directory Access Protocol LDAP version 3 directory servers For more information on CSRC and CNR involvement in the cable network refer to the CSRC and CNR documentation Cisco Network Registrar Install and Upgrade Gui...

Страница 26: ...ures 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 Cisco uBR7200 Series Universal Broadband Routers at the following URL http www cisco com en US docs cable cmts ubr7200 regulatory compliance ub72rcsi html IP Telephony Services The Cisco uBR7225VXR router...

Страница 27: ...ork path that terminates at the Cisco uBR7225VXR router Upstream data transmission takes place over a telephone modem external or internal to a cable interface as well as a cable interface line card in a PC based on the third party cable interface vendor connected to an analog telephone line Figure 1 7 on page 1 10 illustrates a telco return configuration 271652 Gatekeeper or calling agents Servic...

Страница 28: ...tml The following components are described Network Processing Engine page 1 10 Cisco Cable Interface Line Cards page 1 12 Power Supplies page 1 13 Fan Trays page 1 14 Cisco uBR7225VXR Chassis page 1 16 Subchassis and Midplane page 1 16 CompactFlash Disk page 1 17 Network Processing Engine The network processing engine NPE maintains and executes the system management functions for the Cisco uBR7225...

Страница 29: ...omparisons The network processing engines used in the Cisco uBR7225VXR router are the Cisco uBR7200 NPE G1 and Cisco uBR7200 NPE G2 Note The Cisco uBR7200 NPE G1 should use the boothelper image ubr7200 kboot mz 122 33 SCA bin available from Cisco IOS Release 12 3 33 SCA and later The Cisco uBR7200 NPE G2 should use the boothelper image ubr7200p boot mz 122 33 SCA1 bin available from Cisco IOS Rele...

Страница 30: ...e nse_memory_install memory html Cisco Cable Interface Line Cards Cisco cable interface line cards also known as line cards with internal IF to RF upconverters serve as the RF interface between the cable headend and both DOCSIS based cable modems and EuroDOCSIS based cable modems and set top boxes STBs Cisco cable interface line cards separate downstream output and upstream input cable interfaces ...

Страница 31: ...put power supply unit provides a grip point for removing and replacing the power supply Figure 1 8 on page 1 13 shows the faceplate of the AC input power supply A single captive installation screw secures the power supply to the chassis and seats the power supply in the router midplane The AC input power supply has a receptacle for an AC input power cable A modular power cable connects the AC inpu...

Страница 32: ...or example if the power supply was on when the power was disconnected or lost move the power switch to the off position and then back to the on position If you do not wait the full 10 seconds or move the power switch from one position to the other the power supply does not restart Fan Trays The fan tray for the Cisco uBR7225VXR router shown in Figure 1 9 consisting of three fans that are attached ...

Страница 33: ... left and right sides of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating inside the chassis we recommend at least 3 inches of clearance See the Site Requirements section on page 2 5 Figure 1 10 Internal Airflow Top View 271654 1 3 4 2 1 Power supply end 3 Cable interface line card end 2 Inlet flow 4 Exhaust air fan side ...

Страница 34: ... G2 Arbitrates traffic across the PCI buses Cisco uBR7225VXR Subchassis The subchassis the rear of the router has two bays for power supplies and one slot for a network processing engine See Figure 1 12 The cable interface card side of the Cisco uBR7225VXR router midplane has two connectors for cable interface line cards The power supply side of the midplane has two connectors for power supplies a...

Страница 35: ...always addressed as disk2 when using Cisco IOS command line interface CLI commands CompactFlash Disks are smaller in size than Type 2 Flash Disks but provide the same AT Attachment ATA interface and equivalent functionality This interface complies with the ANSI ATA Interface Document X3T13 1153 D Rev 9 specification The CompactFlash Disk provides 512 MB or 1 GB of storage space 271655 Back Top 1 4...

Страница 36: ...liminates the need for the squeeze command which was required with older style linear flash memory cards to recover the space used by deleted files The CompactFlash Disk also supports the Cisco IOS File System feature which provides a single interface to all of the router s file systems including the Flash Disks and flash memory as well as network file systems such as File Transfer Protocol FTP an...

Страница 37: ...fety and protect the equipment This list does not cover all potentially hazardous situations so be alert Before installing configuring or maintaining the Cisco uBR7225VXR router 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 US docs cable cmts ubr7200 regulatory co...

Страница 38: ...e 1 2 14 3 Service Personnel Warning Ultimate disposal of this product should be handled according to all national laws and regulations Statement 1040 Lifting the Cisco uBR7225VXR Router Safely Before you install the router ensure that your site configuration is properly designed and prepared so that you can avoid having to move the router later to accommodate power sources and network connections...

Страница 39: ...en 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 installing or removing a c...

Страница 40: ...led can result in complete or intermittent system failures The network processing engine and cable interface line cards consist 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 proces...

Страница 41: ... site maintains an ambient temperature of 32 to 104o F 0 to 40o C and keep the area around the chassis as free from dust as is practical Note To locate the most reliable channels for your downstream and upstream channel plans we recommend that you perform a sweep of all available channels for at least a 24 hour period to verify the presence or absence of impulse or ingress noise AC Power The AC in...

Страница 42: ...nce difficult Following are precautions that can help avoid problems during installation and ongoing operation General Precautions Follow these general precautions when planning your equipment locations and connections Use the show environment command regularly to check the internal system status The environmental monitor continually checks the interior chassis environment it provides warnings for...

Страница 43: ...our system administrator must configure the individual and system interfaces before you connect your system to external networks Refer to the following documentation for configuration information Cisco uBR7200 Series Software Configuration Guide at the following URL http www cisco com en US docs cable cmts ubr7200 configuration guide cr72scg html Cisco IOS CMTS Cable Software Configuration Guide a...

Страница 44: ...s and equipment to install the chassis and the rack mount and cable management kit Number 2 Phillips screwdriver 3 16 inch flat blade screwdriver 7 16 inch flat blade screwdriver 7 16 inch torque wrench for connecting coaxial cables to the cable F connectors on the cable interface line cards Recommended torque is 20 inch pounds optional Tape measure optional Level optional Rack Mount and Cable Man...

Страница 45: ...s If you plan to connect a computer directly to an Ethernet port in the Cisco uBR7225VXR router you need this type of cable Fast Ethernet transceiver DOCSIS cable modem or DOCSIS based STB and CPE devices to test full system functionality Note When the Cisco uBR7225VXR router starts running IF downstream output is generated For more information see the Powering On the Cisco uBR7225VXR Router secti...

Страница 46: ... Site Log then to the Cisco uBR7225VXR Router Chassis Rack Mounting Options section on page 3 2 to begin the installation Provisioning the Cable Headend This section describes the necessary preparations to make at the cable headend before you install the Cisco uBR7225VXR universal broadband router Two Way Data and VoIP To prepare for two way data operation including digitized voice and fax ensure ...

Страница 47: ...nstream Refer to the Receivers section on page 2 11 High frequency signals flow in the downstream direction from the Cisco uBR7225VXR router to cable interfaces and STBs Low frequency signals flow in the upstream direction from the cable interfaces to the Cisco uBR7225VXR router A diplex filter has three ports low high and common The downstream attaches to the high port because it runs at high fre...

Страница 48: ...ts 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 network relie...

Страница 49: ...liant gateways throughout the network Gatekeepers also manage 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...

Страница 50: ...istances 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 and...

Страница 51: ...articular rack check for obstructions such as a power strip that could impair rack mount installation If a power strip impairs a rear rack mount installation remove the power strip before installing the Cisco uBR7225VXR router in the rack then replace it after the chassis is installed As an alternative you can mount the Cisco uBR7225VXR router on an equipment shelf if the rack dimensions allow you...

Страница 52: ... the Cisco uBR7225VXR router product number ACS uBR7225 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 maintenance connecting cables or replacing or upgrading components Otherwise allow at least 23 25 inches 59 06 cm of clearance at the front and 19 inches 48 3 cm at the back ...

Страница 53: ... Cisco uBR7225VXR router assemble the equipment needed to support your network configuration and subscriber service offering Ensure all power and cabling requirements are met based on the equipment to be installed Also ensure that environmental conditions are met to maintain proper equipment operation Table 2 2 is a checklist that identifies the key tasks to complete Table 2 2 Site Preparation Che...

Страница 54: ...er cords blank power supply filler plate should be installed in empty power supply slot Up to two cable interface line cards blank cable interface line cards should be installed in empty cable interface line card slots CompactFlash Disk The following accessories might arrive in separate shipping containers Rack mount and cable management kit Two rack mount brackets cable management bracket eight M...

Страница 55: ...nt racks 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 bracket is designed to relieve the strain on interface cables that are installed on cable interface line cards in a Cisco uBR7225VXR router If you are installing an equipment shelf or using mounting hardware other than that supplied with the chas...

Страница 56: ...adband routers can be stacked in a rack with little or no vertical clearance Note We recommend the rear bracket mounting system for 4 post racks This method enables you to keep cables from protruding too far out in front of the Cisco uBR7225VXR router and to simultaneously manage the cables at the front of the chassis with the cable management bracket Table 3 1 Cisco uBR7225VXR Router Installation...

Страница 57: ...wn 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 chassis protruding out of the rack install the rack mount brackets at the front of the chassis in the orientation shown in Figure 3 4 on page 3 5 I...

Страница 58: ...stalling 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 1 Rack mount bracket 271659 1 271660 1 1 Rack mount br...

Страница 59: ...acket mounting information Figure 3 5 Installing the Chassis in a Telco Type Rack Cable Management Bracket Requirements There are two cable management bracket configurations available for rack mounting the Cisco uBR7225VXR 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 f...

Страница 60: ...the chassis and the cable management bracket is installed at the right front of the chassis See Figure 3 7 You must install both sets of brackets before you install the chassis in the rack Figure 3 6 Installing the Chassis in a 4 Post Rack with an Installed Cable Management Bracket Figure 3 7 Installing the Chassis in a Telco Type Rack with an Installed Cable Management Bracket 1 Rack mount bracke...

Страница 61: ... cable management bracket on the chassis for a rear rack mount configuration complete the following steps Step 1 Locate the threaded holes in the rear 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 8 Figure 3 8 Installing the Rack Mount Brackets on the Rear of the Chassis Note There are five holes in each of the ra...

Страница 62: ...rackets on the Front of the Chassis To install the rack mount brackets and cable management bracket on the chassis for a front rack mount configuration complete the following steps Step 1 Locate the threaded holes in the front sides of the chassis Step 2 If you want the front of the chassis flush with the front of the rack align the first rack mount bracket to the threaded holes in the right side ...

Страница 63: ...the screws This completes the procedure for installing the rack mount brackets on the chassis for a front rack mount configuration Proceed to the Installing the Chassis in the Rack section on page 3 10 Caution To prevent injury review the safety precautions in Chapter 2 Preparing the Cisco uBR7225VXR Router for Installation before installing the universal broadband router in a rack Installing Rack...

Страница 64: ...illips panhead screws through the cable management bracket and into the chassis and tighten the screws This completes the procedure for installing the rack mount brackets and cable management bracket on the Cisco uBR7225VXR router Proceed to the following section Installing the Chassis in the Rack Caution To prevent injury review the safety precautions in Chapter 2 Preparing the Cisco uBR7225VXR R...

Страница 65: ...that your path to the rack is unobstructed If the rack is on wheels ensure that the brakes are engaged or that the rack is otherwise stabilized Caution Two people should perform Step 3 through Step 6 Step 3 Position the chassis so that the front end is closest to you then lift the chassis and move it to the rack To prevent injury avoid sudden twists or moves Step 4 Slide the chassis into the rack ...

Страница 66: ...can be drawn into the interior of the router by the cooling fans Excessive dust inside the router can cause overtemperature conditions and component failures There must be approximately 23 25 inches 59 06 cm of clearance at the front and 19 inches 48 3 cm at the back of the Cisco uBR7225VXR router for installing and replacing field replaceable units FRUs or accessing network cables or equipment Ma...

Страница 67: ...re 3 7 on page 3 6 Step 3 Thread two M3 x 6 mm Phillips panhead screws through the bracket and into the chassis Use a number 2 Phillips screwdriver to tighten the screws This completes the steps for installing the cable management bracket on the Cisco uBR7225VXR router Proceed to Cabling section on page 3 13 to continue the installation Cabling This section provides information on connecting cable...

Страница 68: ...ns the console and auxiliary ports The console port is a RJ 45 receptacle for connecting a data terminal which you use to configure the interfaces and bring up the Cisco uBR7255VXR router The auxiliary port is a RJ 45 receptable for connecting a modem or the other DCE device such as a channel service unit data service unit CSU DSU to the router See Figure 3 12 on page 3 14 Note Both the console an...

Страница 69: ... 15 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 Clear To Send CTS input The console port does not support modem control or hardware flow control Table 3 2 lists the signals used on the console port The console port requires a straight through EIA TIA 232 cable Auxiliary...

Страница 70: ...building This conductor should consist of a minimum 6 American Wire Gauge AWG stranded copper wire See Figure 3 13 to identify the ground lug location Figure 3 13 Cisco uBR7225VXR Ground Lug Location Connecting Power Following are the procedures for connecting AC input power to your Cisco uBR7225VXR universal broadband router Warning High leakage current earth connection essential before connectin...

Страница 71: ...suitably installed ground conductor Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available Statement 1024 Note Detailed instructions for handling and replacing the Cisco uBR7225VXR router power supplies are contained in the Cisco uBR7200 Series Universal Broadband Router AC Input Power Supply Replacement Instructions at t...

Страница 72: ... the Cisco uBR7225VXR Router section on page 3 18 Powering On the Cisco uBR7225VXR Router After installing your Cisco uBR7225VXR universal broadband router and connecting cables power on the universal broadband router as follows Step 1 Check for the following Each cable interface line card is inserted in its slot and its captive installation screws are tightened The network processing engine is in...

Страница 73: ...tarts running The downstream IF carrier will be present if a cable interface line card is properly installed and passes diagnostics the router has been powered on for more than two minutes the IF downstream shutdown command no cable downstream if output has not been configured or the Cisco uBR7225VXR router is not in ROMMON mode The amplitude and shape of the downstream IF carrier will not change ...

Страница 74: ...re Configuration Guide at the following URL http www cisco com en US docs cable cmts ubr7200 configuration guide cr72scg html You do not have to configure the interfaces immediately however you cannot enable the interfaces or connect them to any networks until you have configured them Many of the cable interface line card LEDs do not come on until you have configured the interfaces To verify corre...

Страница 75: ...w page 4 3 Connecting and Configuring the Downstream page 4 4 Measuring the Downstream RF Signal page 4 4 Connecting and Configuring the Upstream page 4 18 Measuring the Upstream RF Signal page 4 22 Measuring the RF Signal at the Forward Test Point on a Laser Transmitter page 4 37 Configuring the Digital Signal page 4 40 Note Before installing your Cisco uBR7225VXR router analyze the radio frequen...

Страница 76: ...tor 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 point Main headen...

Страница 77: ...nes that 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 large...

Страница 78: ...outer in your headend site you must connect the Cisco uBR7225VXR router 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 The Cisco uBR MC16U E 16U and Cisco uBR MC28U E 28U cable interface line cards have an onboard integrated upconverter that generates an RF signal suitable for co...

Страница 79: ...RF Signal Using the Channel Power Option on a Spectrum Analyzer If you want to measure the downstream RF signal using CATV mode proceed to the Measuring the Downstream RF Signal Using CATV Mode on a Spectrum Analyzer section on page 4 11 Measuring the Downstream RF Signal Using the Channel Power Option on a Spectrum Analyzer The following sections describe how to measure the downstream RF signal u...

Страница 80: ...re 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 4 Figure 4 4 Measuring the IF Channel Power Note The IF channel power in Figure 4 4 is 34 23 dBmV as displayed on the spectrum analyzer Step 6 Select the video averaging feature Your spectru...

Страница 81: ...ging 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 line card downstream connector Step 2 Connect the downstream output of the cable interface line card to the upconvertor input connector Step 3 Connect the spectrum analyzer to the RF output of the upconver...

Страница 82: ...m 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 7 The sloping ...

Страница 83: ...ee if there is too much power on the upconverter output In Figure 4 9 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 9 Measuring the RF Signal at the Upconverter Output Upconverter ...

Страница 84: ...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 11 Figure 4 11 Measuring the RF Signal at the Upconverter Output Using Video Averaging Note The approximate in channel peak to valley flatness may be verified using the spectrum analyzer s video averaging feature Be awar...

Страница 85: ...1 Measuring the Downstream RF Signal at the Upconverter Output Using CATV Mode page 4 14 Note We recommend using as recent a model of spectrum analyzer as possible to perform the two analyses described here You can use spectrum analyzers such as the Agilent 8591C http www tm agilent com or the Tektronix 2715 http www tek com to help you perform the tasks outlined in this section Measuring the Down...

Страница 86: ...um Analyzer in CATV Mode Initial Screen Step 4 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 13 Figure 4 13 Viewing the IF Signal on a Spectrum Analyzer in CATV Mode Preliminary Digital Channel Power Screen Step 5 Enter a digital channel to measure and select digital channel power Your spectrum analyzer will disp...

Страница 87: ...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 15 Figure 4 15 Measuring the IF Signal on a Spectrum Analyzer in CATV Mode Adjusted Digital Channel Power Screen Note The IF channel power in Figure 4 15 is 33 dBmV as displayed on the spectrum analyzer Step 7...

Страница 88: ...um 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 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 leve...

Страница 89: ...um Analyzer 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 18 Figure 4 18 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 disp...

Страница 90: ...l 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 20 Figure 4 20 Measuring the RF Signal at the Upconverter Output in CATV Mode Adjusted Digital Channel Power Screen Step 10 Select the video averaging feature Your spect...

Страница 91: ...owever that amplitude values registered while in the video averaging mode are typically around 2 5 dB below the actual channel power Step 11 Verify that your headend RF measurements meet the recommended DOCSIS parameters listed in the tables in Appendix B RF Specifications Step 12 Record your headend settings and measurements in Appendix G Site Log as you verify them This will assist in troublesho...

Страница 92: ...matic power control when transmitting 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 line cards available for the Cisco uBR7225VXR router depending on the channel bandwidth you are using Note If you have a Cisco uBRMC16x cable interface line card six upstream por...

Страница 93: ...istance This procedure is known as establishing the X level test point See Figure 4 23 Figure 4 23 The X level Test Point Cisco uBR7225VXR 271676 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 all opt...

Страница 94: ...ing Multiple X level Test Points Connected to One Upstream Port Figure 4 25 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 uBR7225VXR Downstream 271677 Upstream 0 dBmV 3 dB attenuator 3 dB attenuator 3 dB attenuator 40 dB attenuator 3 dB attenuator 8 dB attenuator 21 dB attenua...

Страница 95: ...r 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 Fiber optic ca...

Страница 96: ...e your analyzer 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 uBR7225VXR router configuration file Step...

Страница 97: ...nalyzer display in Figure 4 26 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 27 Note Be sure that your particular spectrum analyzer is capable of supporting sweep times as short as 80 microseconds Figure 4 27 Measuring the Upstream RF Signal Setting the Sweep Time Period Step 7 Position the trig...

Страница 98: ...ignals in the 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 28 Measuring the Upstream RF Signal Accurately Measured Amplitude on Spectrum Analyzer Step 9 Position a marker about 7 8 of the way int...

Страница 99: ... 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 uBR7225VXR universal broadband router with a console terminal Step 2 Adjust the sweep time on your spectrum analyzer to 20 microseconds Step ...

Страница 100: ... 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 ...

Страница 101: ...hat 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 33 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 retu...

Страница 102: ...n 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 resolution ...

Страница 103: ...ng figures Figure 4 35 through Figure 4 38 are taken from a vector signal analyzer If you do not have access to a vector signal analyzer or want 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 vec...

Страница 104: ... 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 36 is a plot of only the p...

Страница 105: ...is 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 35 and Figure 4 36 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 your ...

Страница 106: ...splay a set of screens similar to those in Figure 4 38 Figure 4 38 displays the QPSK demodulation information for the same upstream signal as in Figure 4 37 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 grap...

Страница 107: ... 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 the...

Страница 108: ...fault 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 28 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 offset ...

Страница 109: ... 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 41 clearly shows the tight pattern of the preamble stretched across three quarters of the spectrum analyzer display Figure 4 41 Original Preamble Viewed with Accelerated Sweep Time Step 8 C...

Страница 110: ... 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 42 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 swee...

Страница 111: ...pment Because 1 to 2 dB is well within 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 Use ...

Страница 112: ...aser Transmitter Video Channel Display Step 3 Select the carrier level or amplitude function Figure 4 46 shows the detailed display of the analog carrier level and frequency screen for the channel 48 in this example Figure 4 46 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 chann...

Страница 113: ... and advance the screen displays next screen until the digital channel power display is shown See Figure 4 48 Figure 4 48 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 Set...

Страница 114: ...iversal broadband router and cable modems We recommend 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 produc...

Страница 115: ...tream 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 If a digital si...

Страница 116: ...4 42 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend Configuring the Digital Signal ...

Страница 117: ...red You can remove and replace a cable interface line card with the same type of component without interrupting the system This function allows you to install and replace the same type of cable interface cards while the router is operating Note To replace a cable interface line card with a different type of line card for example hot swapping from a Cisco uBR MC16U to a Cisco uBR MC28U you must cop...

Страница 118: ...oved If the same type of interface card type is reinserted into a slot its interfaces are configured and brought online up to the interface count of the original cable interface line card If however any new interfaces are put in the administratively shutdown state as if they were present but not configured at boot time the system must be configured Environmental Monitoring and Reporting Functions ...

Страница 119: ...the middle of the midplane Temperature MP LC is located on line card side of the middle of the midplane If the air temperature exceeds a defined threshold the system controller displays warning messages on the console terminal and if the temperature exceeds the shutdown threshold it shuts down the system The system stores the present parameter measurements for both temperature and DC voltage in NV...

Страница 120: ...hows 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 uBR7225VXR router Router show environment last NPE Inlet previously measure...

Страница 121: ... 1 91 2 34 1 20 V 0 82 1 13 1 28 1 56 VDD_CPU 0 89 1 21 1 36 1 71 VDD_MEM 1 71 2 34 2 65 3 28 VTT 0 85 1 17 1 32 1 64 3 45 V 2 42 3 24 3 63 4 49 11 95 7 14 9 54 14 28 16 12 5 15 V 3 63 4 84 5 46 6 75 12 15 V 8 55 11 36 12 89 14 94 1 2 V MP NPE 1 01 1 12 1 26 1 37 1 8 V MP NPE 1 51 1 67 1 90 2 05 3 45 V MP NPE 3 00 3 31 3 77 4 08 5 15 V MP NPE 4 46 4 92 5 55 5 96 12 V MP NPE 10 13 11 22 12 65 13 74...

Страница 122: ... is on the Cisco uBR7225VXR router fans should be operational The system continues to operate if a fan fails however if the air temperature exceeds a defined threshold the system controller displays warning messages on the console terminal and if the temperature exceeds the shutdown threshold it shuts down the system If the system does shut down because the temperature exceeded the shutdown thresh...

Страница 123: ...r to this flow chart as necessary and follow the steps to isolate hardware problems to a specific subsystem For cable specific commands for the Cisco uBR7225VXR universal broadband router 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 Technica...

Страница 124: ...le interface line cards The system memory and management functions reside on the network processing engine The enabled LED on each cable interface line card indicates if the cable interface line card is initialized Caution A cable interface line card that is partially installed in the midplane can the cause system to hang and crash Turn on system power DC OK LED on No No Yes Yes Yes Yes Yes Troubl...

Страница 125: ...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 following should occur 1 You should immediately hear the fans operating If not proceed to the Cooling Subsystem section on page 6 4 If you determine that the power supply is funct...

Страница 126: ...d c Turn the switch back on Step 5 If the Input OK LED comes on return the first power cable for replacement Contact a service representative for further instructions Step 6 If the Input OK 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 uBR722...

Страница 127: ...t is not entering the inlet vent on the router and that there is sufficient clearance around the sides of the chassis to allow cooling air to flow Refer to the Site Environment section on page 2 5 and the Equipment Racks section on page 2 15 for more on site configurations Processor Subsystem The processor subsystem is comprised of the network processing engine and all cable interface cards The ne...

Страница 128: ...interface line card enabled LEDs are off a If yes verify that you are running a version of Cisco IOS software that supports the cable interface line cards you are using For the latest Cisco IOS software release information refer to the Cisco uBR7200 series release notes at the following URL http www cisco com en US products hw cable ps2217 prod_release_notes_list html For the latest information on...

Страница 129: ... uBR900 series cable access routers are equipped with 64 and 256 QAM receivers that require only minimal setup Configure the Cisco uBR900 series routers according to DOCSIS practices Tip A maximized signal to noise ratio SNR estimate optimizes cable interface reliability and service quality Note The SNR estimate for a cable interface installed at the headend should be between 35 and 39 dB Before s...

Страница 130: ...verter RF output and the headend combiner input so that the digitally modulated carrier s average power level is 6 dB 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 ...

Страница 131: ... and one secondary PCI bus with an aggregate bandwidth of 600 Mbps Dimensions H x W x D 3 5 x 17 32 x 21 875 in 8 89 x 43 99 x 55 56 cm Weight Chassis fully configured with a network processing engine and 2 power supplies 48 pounds 21 8 kg Heat dissipation 370W1 1262 Btu2 AC input power 300W maximum with either a single or dual power supply configuration Maximum AC input voltage 100 to 240 VAC3 wi...

Страница 132: ...CI Class 2 AS NRZ 3548 Class A Immunity IEC 1000 4 2 IEC 1000 4 3 IEC 1000 4 4 IEC 1000 4 5 IEC 1000 4 6 IEC 1000 4 11 IEC 1000 3 2 See the Regulatory Compliance and Safety Information for Cisco uBR7200 Series Universal Broadband Routers at the following URL http www cisco com en US docs cable cmts ubr7200 regulatory compliance ub72rcsi html 1 W watts 2 Btu British thermal units 3 VAC volts altern...

Страница 133: ...DC revised 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...

Страница 134: ...le system 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 dis...

Страница 135: ... at the test frequency at the same level as the highest frequency NTSC carrier 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 CM...

Страница 136: ...ly 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 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 sec...

Страница 137: ... 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 varying discrete ingress signals that could be as high as 10 dBc Ratios are guaranteed only within the digital carr...

Страница 138: ...sumes that the digital carrier is operated at analog peak carrier level When the digital carrier is operated below the analog peak carrier level the carrier to noise ratio may be less Carrier to 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...

Страница 139: ...n 22 dB Carrier to ingress power the sum of discrete and broadband ingress signals ratio in active channel Not less than 22 dB1 1 Ingress avoidance or tolerance techniques may be used 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 act...

Страница 140: ...c QAM 256 EuroDOCSIS 6 952 Msym sec for QAM 64 and QAM 256 Bandwidth DOCSIS 6 MHz 18 square root raised cosine shaping for QAM 64 12 square root raised cosine shaping for QAM 256 EuroDOCSIS 8 MHz 15 square root raised cosine shaping for both QAM 64 and QAM 256 Total input power 40 900 MHz 30 dBmV 90 dBmicroV Input load impedance 75 ohms Input return loss DOCSIS 6 dB 88 860 MHz EuroDOCSIS 6 dB 85 8...

Страница 141: ...ns Electrical Input and Output Bandwidth 200 kHz 400 kHz 800 kHz 1600 kHz 3200 kHz Output impedance 75 ohms Output return loss DOCSIS 6 dB 5 42 MHz EuroDOCSIS 6 dB 5 65 MHz Connector F connector per ISO 169 24 common with the input Table B 10 Upstream Electrical Output from the Cable Modem continued Parameter Value ...

Страница 142: ...B 10 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Appendix B RF Specifications Electrical Input and Output ...

Страница 143: ...e 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 cen...

Страница 144: ...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 145: ...nd 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 Table C 1 ...

Страница 146: ...TP 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 does not supply Category 3 or Category 5 UTP RJ 45 cables these cables are available commercially Identifying an RJ 45 Crossover Cable You can ident...

Страница 147: ... 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 See Figure C 4 Figure C 4 RJ 45 Straight Through Cable Identification Note If your cable was purchased from Cisco pin 1 is white Pins 4 5 7 and 8 are not connected Table C 3 lists the pinouts for the two Fast Ethernet ports 62741 Pin 1 Pin 2 Pin 3 P...

Страница 148: ...ther router or switch In general multimode cables are gray or orange and single mode cables are yellow For Ethernet 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 fiber cables between the d...

Страница 149: ...quency 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 coax...

Страница 150: ...A EIA TSB 95 Additional Performance Guidelines for 4 Pair 100 OHM Category 5 Cabling In addition the following relevant standards are available from Global Engineering Documents FIBS PUB 175 Federal Building Standard for Telecommunication Pathways and Spaces FIBS PUB 176 Residential and Light Commercial Telecommunications Wiring Standard Optical Fiber Color Codes The most common color code for opt...

Страница 151: ... used for a group are white red black yellow and violet The colors used for pair within a group are blue orange green brown and slate Each pair must have a unique color combination One wire within each pair has a solid background of its group color and stripes of the pair within a group color the second wire has the colors reversed Table D 2 lists the sequences Note that red brown and red orange w...

Страница 152: ...2 13 1 Black Green 38 13 2 Green Black 13 14 1 Black Brown 39 14 2 Brown Black 14 15 1 Black Slate 40 15 2 Slate Black 15 16 1 Yellow Blue 41 16 2 Blue Yellow 16 17 1 Yellow Orange 42 17 2 Orange Yellow 17 18 1 Yellow Green 43 18 2 Green Yellow 18 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 O...

Страница 153: ...ndence with the paired wire color code The alternate color code is included because sometimes the station wire uses the first three pairs of the standard color code white blue blue white and so on while other times it uses the six alternate color wires Table D 3 Alternate Color Code Scheme for Smaller Numbers of Wires Pair Number Wire Number Solid Color Stripe Color Alternate Color Pin Number 1 1 ...

Страница 154: ...D 6 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Appendix D Industry Standard Wiring Plans Telephone Wire Color Codes ...

Страница 155: ...ht is 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 768 x 576 Th...

Страница 156: ...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 frequency ...

Страница 157: ... 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 97...

Страница 158: ...5 276 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 3...

Страница 159: ...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 5...

Страница 160: ...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 0 738...

Страница 161: ...04 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 0 941...

Страница 162: ... 9 198 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 ...

Страница 163: ...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 C...

Страница 164: ...llocation 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 165: ...2 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 25...

Страница 166: ...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 53 ...

Страница 167: ...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 MHz...

Страница 168: ...E 14 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Appendix E Frequency Allocation Tables PAL SECAM Cable Television Channels and Relative Frequencies ...

Страница 169: ...agle Comtronics http www eaglecomtronics com Diplex filters Microwave Filter Company Inc http www microwavefilter com Diplex filters PCI Technologies http www pci com Diplex filters Viewsonics http www viewsonics com Diplex filters Coaxial Jumpers Attenuators Splitters and Taps Viewsonics http www viewsonics com Variable attenuators Comb generators Cisco uBR kit splitter diplex filter attenuators ...

Страница 170: ...er Products Model Digital Signal Level Meters QAM Analyzers Acterna http www acterna com SDA 5000 w Option 4B Agilent1 1 Formerly Hewlett Packard Test and Measurement Division http www agilent com Agilent 8594Q N1776A Telsey2 2 Formerly Tektronics DMA division http www telsey it DMA120 DMA122 Sencore http www sencore com QAM B970 Sunrise Telecom3 3 Formerly Hukk Engineering and Avantron http www s...

Страница 171: ...plex filters PCI Technologies http www pci com Diplex filters Viewsonics http www viewsonics com Diplex filters Coaxial Jumpers Attenuators Splitters and Taps Viewsonics http www viewsonics com Variable attenuators Comb generators Cisco kit splitter diplex filter attenuators coaxial jumpers Vecima http www vecima com Cisco uBR kit splitter diplex filter attenuators White Sands Engineering Inc http...

Страница 172: ...Model Digital Signal Level Meters QAM Analyzer Acterna http www acterna com SDA 5000 w Option 4B Agilent1 1 Formerly Hewlett Packard Test and Measurement Division http www agilent com Agilent 8594Q N1776A Sunrise Telecom2 2 Formerly Hukk Engineering and Avantron http www sunrisetelecom com AT2000RQ Swires Research http www swire com TVA 2000 Q Telsey3 3 Formerly Tektronics DMA division http www te...

Страница 173: ...list as each procedure is completed Upgrades and removal and replacement procedures Use the site log 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 Cable interface line cards installed removed or replaced Network processing engine removed replaced or upgraded Power supply removed or replaced Redu...

Страница 174: ...G 2 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 Appendix G Site Log Table G 1 Site Log Date Description of Action Performed or Symptom Observed Initials ...

Страница 175: ...er 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 feet 550 meters in length The 1000Base SX specification is based on the IEEE 802 3 standard 1000Base X 1000 Mbps Gigabit Ethernet specification that refers to the 1000Base ZX 1000Base ...

Страница 176: ...e information about a problem use the show facility alarm status command See also Major alarm and Minor alarm CSRC Cisco Subscriber Registration Center CSU DSU Channel service unit data service unit CTS Clear To Send D DCD Data carrier detect DCE Data circuit terminating equipment ITU T expansion Devices and connections of a communications network that comprise the network end of the user to netwo...

Страница 177: ...ic discharge EuroDOCSIS European Data over Cable Service Interface Specifications F Fast Ethernet Any of a number of 100 Mbps Ethernet specifications Fast Ethernet offers a speed increase 10 times that of the 10Base T Ethernet specification while preserving qualities such as frame format MAC mechanisms and MTU Existing 10Base T applications and network management tools can be used on Fast Ethernet...

Страница 178: ...gement interface between the customer premises equipment and the Frame Relay network for European channel plans M MAC Media Access Control Major alarm One of a group of alarm conditions that are considered the second most severe of all reportable alarms Major alarms affect several subscribers who connect to the reporting node You can use the show facility alarm status Cisco IOS command to obtain m...

Страница 179: ...mplitude QPSK Quaternary phase shift keying A compression technique used in modems and wireless networks R RTS Request to send S SDH Synchronous Digital Hierarchy SDRAM Synchronous dynamic random access memory SECAM SEquential Couleur Avec Memoire SGCP Simple Gateway Control Protocol SONET Synchronous Optical Network High speed synchronous network specification developed by Bellcore and designed t...

Страница 180: ...k TAC Technical Assistance Center ToD Time of day TFTP Trivial File Transfer Protocol U UBR Universal broadband router UTP Unshielded twisted pair V VoIP Voice over IP VPN Virtual private network VXR Voice Extension Ready X X level test point A test point that is established by inserting a test signal of known amplitude into a fiber node and then measuring the output level amplitude at the headend...

Страница 181: ...ement kit using 2 17 cable network configurations overview 1 6 cables AC power 1 13 Category 3 or 5 UTP C 4 connecting 3 14 crossover C 4 C 5 Fast Ethernet ports C 4 interference 2 14 return loss C 2 rollover C 2 safety guidelines 2 4 straight through C 4 C 5 swapping power 6 4 ungrounded and uninsulated 2 4 wire gauge C 1 Category 3 or 5 UTP RJ 45 cables C 4 CATV mode 4 11 to 4 17 caution chassis...

Страница 182: ... 4 25 4 26 data transmission verify downstream signals 6 7 described i xii DHCP server 2 12 digital data signals 4 3 digital signal level meter manufacturers F 2 F 4 diplex filter manufacturers F 1 F 3 diplex filters 2 11 displays environmental 5 3 distance limitations transmission 2 14 DNS server 2 12 DOCSIS 2 12 transfer configuration files 2 12 DOCSIS 1 0 parameters B 2 DOCSIS 1 1 parameters B ...

Страница 183: ...adend provisioning required network information 2 7 hybrid fiber coaxial HFC C 1 I identifying startup problems 6 3 IF channel power 4 6 measuring the signal 4 5 to 4 7 impulse noise 4 3 ingress noise 4 3 installation analyzing the RF 4 1 before you begin 2 7 checking the shipping container 2 9 checklist 3 1 connecting cables 3 14 connecting power 3 16 equipment 2 9 ESD 2 4 general 3 12 headend se...

Страница 184: ...4 3 ingress 4 3 outside plant 4 28 normal status level environmental monitor 5 4 NTSC M frequency allocations E 8 NTSC frequency allocation E 3 NTSC standard description E 1 NVRAM log 5 3 O OIR 1 2 5 1 online insertion and removal see OIR operating conditions for chassis A 1 out of tolerance temperature condition 5 2 out of tolerance voltage condition 5 2 overheating preventing 2 6 overtemperature...

Страница 185: ...ovisioning 2 12 2 13 AAA server 2 13 access server 2 12 diplex filters 2 11 Q QAM analyzer manufacturers F 2 F 4 QPSK data points 4 32 QPSK demodulation mode 4 32 R rack mount installation 3 1 rack mount kit 2 10 3 2 radio frequency interference see RFI 2 14 RADIUS dial server 2 12 rate symbol B 1 RF analyzing the upstream signal 4 25 configuring the signal 4 4 measuring the signal 4 5 measuring t...

Страница 186: ...ions A 1 T tap manufacturers F 1 F 3 telco return overview 1 9 telco type equipment racks 2 15 3 1 telephone jacks 2 4 temperature internal chassis 5 2 test points calibrating 4 21 HFC network 4 20 TFTP server 2 12 This 5 1 thresholds shutdown 5 2 TIA EIA standards information D 2 time domain 4 30 time of day TOD server 2 12 tools for installation 2 8 transmission characteristics B 2 B 3 B 4 B 5 B...

Страница 187: ...disconnection 2 4 product disposal 2 2 qualified personnel 2 2 safety precautions 3 10 service personnel 2 2 stacking the chassis 3 12 supply circuit 3 16 telecommunications lines 2 4 TN power 3 17 weight 1 3 wiring interference 2 14 optical color codes D 2 plant 2 14 telephone 2 4 telephone color codes D 3 telephone station terminal color codes D 5 X X level test points 4 20 Z zero span 4 28 ...

Страница 188: ...Index IN 8 Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide OL 17309 01 ...

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