Product Overview 1-47

Overview of the Cisco 12008

Figure1-13 Block Diagram of the CSC

The major functions of each element of the CSC are summarized briefly in the following

paragraphs.

Master clock generatorThis function on the CSC provides a clock source to the RP,

all installed switch cards (including the SFCs and a redundant CSC), and all installed

line cards. The master clock generator synchronizes the transfer of data through the

routers switch fabric.

Master clock/
frame synch
generator
Central
switch
allocator
Single
plane
switch
fabric
SFC
cards
CSC
card
(redundant)
Line cards
and RP
cards
Alarm
functions
Board
power Fan
power
Fan
trays
Mbus
module
Request/grant
Switch data
Clock
Fabric control
Clock and scheduler card (CSC)
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