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Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router

OL-26705-01

Chapter 3 Removing and Installing the Clock Card

Clock Card Removal and Installation

Note

If the clock card installation screws do not appropriately assume a locked position, the clock card is not
completely seated in the midplane. Carefully pull the clock card halfway out of the slot, reinsert it, and
tighten the captive installation screws.

Caution

To prevent jamming the carrier between the upper and the lower edges of the clock card slot, and to
ensure that the edge connector at the rear of the clock card mates with the connection at the rear of the
clock card slot, make certain that the carrier is positioned correctly, as shown in the cutaway in the
following illustrations.

Warning

When performing the following procedures, wear a grounding wrist strap to avoid ESD damage to the
card. Some platforms have an ESD connector for attaching the wrist strap. Do not directly touch the
midplane or backplane with your hand or any metal tool, or you could shock yourself.

Warning

To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord.

Clock Card Removal and Installation

In this section, the illustrations that follow give step-by-step instruction on how to remove and install the
clock card. This section contains the following illustrations:

•

Cisco uBR7246 VXR—Removing a Clock Card, page 3-4

•

Cisco uBR7246 VXR—Installing a Clock Card, page 3-5

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Содержание UBR7246VXR

Страница 1: ...34 1706 USA http www cisco com Tel 408 526 4000 800 553 NETS 6387 Fax 408 527 0883 Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router Product Numbers UBR CLK T1 Platforms Supported Cisco uBR7246 VXR Text Part Number OL 26705 01 ...

Страница 2: ... correct any interference to radio or television communications at your own expense You can determine whether your equipment is causing interference 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 th...

Страница 3: ... in the Cisco uBR7246 VXR Chassis 1 5 C H A P T E R 2 Preparing for Installation 2 1 Required Tools and Equipment 2 1 Software Requirements 2 1 Safety Guidelines 2 2 Safety Warnings 2 2 Electrical Equipment Guidelines 2 3 Preventing Electrostatic Discharge Damage 2 4 FCC Class A Compliance 2 4 C H A P T E R 3 Removing and Installing the Clock Card 3 1 Installation Overview 3 1 Handling the Clock C...

Страница 4: ...ide for the Cisco uBR7246 VXR Universal Broadband Router OL 26705 01 C H A P T E R 4 Configuring the Clock Card 4 1 Minimum Software Requirements 4 1 Configuration and Diagnostic Cisco IOS Commands for the Clock Card 4 2 A P P E N D I X A Clock Source Paths A 1 ...

Страница 5: ...n This document contains the following chapters Section Title Description Chapter 1 Overview Describes the clock card and its supported features LED displays and behavior and interfaces Chapter 2 Preparing for Installation Describes specific software and hardware requirements safety considerations tools required and procedures you should perform before the actual installation Chapter 3 Removing an...

Страница 6: ...de For software configuration information including detailed configuration information for the Cisco Cable Clock Card refer to the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide For international agency compliance safety and statutory information for WAN interfaces refer to the Regulatory Compliance and Safety Information appendix in the Cisco uBR7200 Series Universal...

Страница 7: ...niversal broadband router The primary and secondary DB 15 interfaces on the front of the clock card connect to external T1 clock signal sources When installed in the Cisco uBR7246 VXR chassis the clock card can propagate a national clock signal throughout the router s midplane by locking onto an external T1 signal originating over the PSTN locking onto a T1 clock signal originating from a port ada...

Страница 8: ...ratum 1 clock has a long term accuracy of 10 11 Stratum 1 clocks are generally used for synchronizing a few master sites in a digital telecommunications network The synchronized signals propagate the time standard throughout the network Wander on the reference input must not exceed ANSI T1 101 section 7 2 2 time deviation for Type III DS1 reference signals Jitter must not exceed the maximum allowa...

Страница 9: ... card can lock on to a T1 clock signal originating from a T1 port adapter installed in the same Cisco uBR7246 VXR and drive the TDM bus which can then be used by cable modem cards in the Cisco uBR7246 VXR transporting traffic using the TDM bus If the primary external clock source experiences a loss of service the clock card enters holdover mode After a few seconds of running in holdover mode the c...

Страница 10: ...s on the Clock Card Faceplate View Table 1 2 describes the purpose and behavior of each LED on the clock card 31596 ENABLE HOLDOVER PRI Pin 9 Pin 1 Pin 3 Pin 11 Table 1 1 DB 15 T1 Clock Card Interface Clock Card End External Clock Source End Pin1 1 Any pins not described in this table are not connected Note Cisco provides DSU CSU cables You can use a DA 15 female to pigtail cable 24 6 feet 7 5 m C...

Страница 11: ...tes that the clock card is currently locked to the secondary external clock source signal ENABLE Green Indicates that the clock card is correctly installed in and recognized by the Cisco uBR7246 VXR chassis HOLDOVER Yellow Indicates that the clock card has lost contact with the current primary and or secondary external clock source s and has entered holdover mode This means that the clock card was...

Страница 12: ...96 Cable interface line cards Fan tray handle Internal fans Clock card PCMCIA slots Optional Fast Ethernet port MII receptacle and RJ 45 receptacle Auxiliary port Console port E N A B L E D D S uBR MCI6 U S U S U S U S 0 1 2 5 E N A B L E D D S uBR MCI6 U S U S U S U S 0 1 2 5 E N A B L E D D S uBR MCI6 U S U S U S U S U S U S 0 1 2 3 4 5 E N A B L E D D S uBR MCI6 U S U S U S U S 0 1 2 5 Captive ...

Страница 13: ...You can use a DA 15 female to pigtail cable 24 6 feet 7 5 m CAB SDS6 cable COM T1Product Number For pinouts refer to http www cisco com univercd cc td doc product core cis7505 ipicg Number 2 Phillips screwdriver Your own electrostatic discharge ESD prevention equipment or the disposable grounding wrist strap included with all upgrade kits field replaceable units FRUs and spares Antistatic mat Anti...

Страница 14: ...heids en andere voorschriften raadplegen dat bij dit toestel is ingesloten Varoitus Tämä varoitusmerkki merkitsee vaaraa Olet tilanteessa joka voi johtaa ruumiinvammaan Ennen kuin työskentelet minkään laitteiston parissa ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana o...

Страница 15: ... deg kjent med vanlig praksis når det gjelder å unngå ulykker Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen kan du se i dokumentet Regulatory Compliance and Safety Information Overholdelse av forskrifter og sikkerhetsinformasjon som ble levert med denne enheten Aviso Este símbolo de aviso indica perigo Encontra se numa situação que lhe poderá causar danos físicos A...

Страница 16: ...otects components from ESD voltages on the body ESD voltages on clothing can still cause damage Never attempt to remove the printed circuit board from the metal carrier Caution For safety periodically check the resistance value of the antistatic strap The measurement should be between 1 and 10 megohms Mohm FCC Class A Compliance The equipment described in this manual has been tested and found to c...

Страница 17: ... page 3 2 Warnings and Cautions page 3 2 Clock Card Removal and Installation page 3 3 Connecting a Clock Card Interface Cable page 3 6 Installation Overview Each clock card circuit board is mounted to a metal carrier and is sensitive to electrostatic discharge ESD damage Note When the clock card slot is not in use a blank clock card must fill the empty slot to allow the router or switch to conform...

Страница 18: ...ed in the chassis You must power down the Cisco uBR7246 VXR when removing and or replacing a clock card Removing the clock card from the chassis before powering off will cause the router to crash Note Before you begin installation read Chapter 2 Preparing for Installation for a list of parts and tools required for installation Warnings and Cautions Observe the following warnings and cautions when ...

Страница 19: ...he connection at the rear of the clock card slot make certain that the carrier is positioned correctly as shown in the cutaway in the following illustrations Warning When performing the following procedures wear a grounding wrist strap to avoid ESD damage to the card Some platforms have an ESD connector for attaching the wrist strap Do not directly touch the midplane or backplane with your hand or...

Страница 20: ... EN AB LE D D S uBR MCI6 U S U S U S U S 0 1 2 5 EN AB LE D D S uBR MCI6 U S U S U S U S U S U S 0 1 2 3 4 5 EN AB LE D D S uBR MCI6 U S U S U S U S 0 1 2 5 uBR CLK T1 ER FREERUN FAULT LOS SEC ACTIVE uBR CLK T1 ENABLE HOLDOVER FREERUN FAULT LOS PRI SEC ACTIVE EN AB LE D D S uBR MCI6 U S U S U S U S 0 1 2 5 EN AB LE D D S uBR MCI6 U S U S U S U S 0 1 2 5 EN AB LE D D S uBR MCI6 U S U S U S U S U S ...

Страница 21: ...rd printed circuit board between the guides in its chassis slot Step 3 With the printed circuit board aligned in the slot guides gently slide the clock card into its chassis slot Step 5 Connect the DB 15 T1 cable s to the front of the clock card Step 4 Tighten the captive installation screws on the clock card uBR CLK T1 ENABLE HOLDOVER FREERUN FAULT LOS PRI SEC ACTIVE uBR CLK T1 ENABLE HOLDOVER FR...

Страница 22: ...ectly to either the primary or secondary DB 15 interface port on the clock card See Figure 3 2 Note When attaching the cable receptacle on the clock card use the cable management bracket that shipped with your router for extra strain relief Figure 3 2 Connecting a Clock Card Cable Front View Step 2 Attach the network end of your DB 15 T1 cable to your CSU DSU DTE or other external equipment Step 3...

Страница 23: ...are Requirements You must have Cisco IOS Release 12 1 1a T1 or later and Cisco IOS Release 12 1 2 EC1 or later if you are configuring the clock card with a Cisco uBR MC16S or Cisco uBR MC16E cable interface line card If you are using a Cisco uBR MC28C cable interface line card with the clock card you must use Cisco IOS Release 12 1 3a EC1 or later If you are using a Cisco uBR MC28U X card you must...

Страница 24: ... reference information current clock card mode of operation any hardware fault and the midplane clock signal source if active show controllers clock reference Displays clock card hardware information and current register values cable clock clear counters Instructs the router to reset the counters displayed by the show controllers clock reference command Config Commands no cable clock source midpla...

Страница 25: ...e Clock Card in a Cisco uBR7246 VXR depending on your external connection s and configuration Figure A 1 Primary External Clock Source PA PRI SRC Midplane clk mux Port adapters w internal clocking External SRCs PRI SEC Clock card clk mux Clock recovery and filter chips PRI clk PRI LOS SEC clk SEC LOS 20 48 MHz To line cards No cable clock source midplane Cable clock force primary default Clock car...

Страница 26: ...card clk mux Clock recovery and filter chips PRI clk PRI LOS SEC clk SEC LOS 20 48 MHz To line cards No cable clock source midplane Cable clock force secondary Clock card primary source to midplane 8 kHz PA PA SEC SRC 31497 PA PA PRI SRC Midplane clk mux Port adapters w internal clocking External SRCs PRI SEC Clock card clk mux Clock recovery and filter chips PRI clk PRI LOS SEC clk SEC LOS 20 48 ...

Страница 27: ...gure A 4 Secondary Internal Clock Source PA PRI SRC Midplane clk mux Port adapters w internal clocking External SRCs PRI SEC Clock card clk mux Clock recovery and filter chips PRI clk PRI LOS SEC clk SEC LOS 20 48 MHz To line cards Cable clock source midplane Cable clock force secondary Clock card primary source to midplane 8kHz PA PA SEC SRC 31500 PA ...

Страница 28: ...A 4 Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router OL 26705 01 Appendix A Clock Source Paths ...

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