Cisco Systems Cisco 12008 manual Block Diagram of the CSC

Overview of the Cisco 12008

Figure 1-13 Block Diagram of the CSC

Clock and scheduler card (CSC)

	Master clock/	Request/grant			Line cards
	frame synch				and RP
	generator				cards
		control	Switchdata		0
	Central			Clock	SFC
	switch
	allocator
	Single	Fabric			cards
	plane				0
	switch
	fabric
	Mbus				CSC
Alarm	module				card
					(redundant)
functions
Board	Fan		Fan
			trays
power	power
				1
				2

1

7

1

2

H11724

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.

Product Overview 1-47