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Product Overview 1-47
Overview of the Cisco 12008
Figure 1-13
Block Diagram of the CSC
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.
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
Cloc
k
F
abr
ic control
Clock and scheduler card (CSC)
H11724
0
1
7
0
1
2
1
2
Summary of Contents for 12008
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Page 12: ...Cisco 12008 Gigabit Switch Router Installation and Configuration Guide xii ...
Page 102: ...Agency Approvals Cisco 12008 Gigabit Switch Router Installation and Configuration Guide 1 80 ...
Page 132: ...Using a Site Log Cisco 12008 Gigabit Switch Router Installation and Configuration Guide 2 30 ...