Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 69

Figure 1-13 Block Diagram of the CSC
Clock and scheduler card (CSC)
Master clock/
frame synch
generator
Central
switch
allocator
Single
plane
switch
fabric
Alarm
functions
Board
power
The major functions of each element of the CSC are summarized briefly in the following
paragraphs.
•
Master clock generator—This 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
router's switch fabric.
Mbus
module
Fan
power
Overview of the Cisco 12008
Request/grant
Line cards
and RP
SFC
cards
CSC
(redundant)
Fan
trays
1
2
Product Overview 1-47
cards
0
1
7
0
1
2
card