Cisco UBR7246VXR Посібник з монтажу - Сторінка 7

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Overview

This chapter describes the Cisco Cable Clock Card and contains the following sections:

•

Clock Card Overview

The Cisco Cable Clock Card (see

to provide a reliable national clock signal to your Cisco uBR7246 VXR universal 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 adapter installed in the same chassis, or by

connecting to a Global Positioning System (GPS) receiver generating a T1 clock signal.

Figure 1-1

Do not attempt to remove or install the clock card unless you have first powered off the

Caution

Cisco uBR7246 VXR.

Note

OL-26705-01

Clock Card Overview, page 1-1

Clock Source Overview, page 1-2

Interface Specifications and Pinouts, page 1-3

LEDs, page 1-4

Clock Card Location in the Cisco uBR7246 VXR Chassis, page 1-5

Clock Card—Faceplate View

PRI

ENABLE

The Cisco Cable Clock Card does not support an E1 interface.

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

C H A P T E R

Figure

1-1) is a dual-port field-replaceable component that is designed

LOS

ACTIVE

HOLDOVER

FREERUN

uBR - CLK-T1

SEC

FAULT

1-1