Cisco UBR7246VXR Panduan Instalasi - Halaman 7
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Overview
This chapter describes the Cisco Cable Clock Card and contains the following sections:
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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
1
uBR - CLK-T1
SEC
FAULT
1-1