Cisco UBR7246VXR Installation Manual page 27

Universal broadband router

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Appendix A

Clock Source Paths

Figure A-4

Secondary Internal Clock Source

Port adapters w/

External SRCs

internal clocking

PRI SEC

Clock recovery

Clock card

Midplane

and filter chips

clk mux

PRI

SRC

PRI clk

20.48

PRI LOS

MHz

To line

cards

SEC clk

SEC

SEC LOS

SRC

Cable clock

force secondary

source-midplane

Clock card primary source to midplane 8kHz

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

A-3

OL-26705-01

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