Chapter 1 Product Overview
Line Cards
1-24
Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
Fabric Functionality
The consolidated switch fabric (CSF) circuity provides synchronized speed
interconnections for the line cards and the RP (
). The CSF circuitry is
contained on 1 card and consists of a clock scheduler and switch fabric
functionality. The CSF card is housed in the bottom slot labeled Fabric Alarm in
the router chassis. The switching capacity is 40 Gbps full duplex.
Figure 1-11
Consolidated Switch Fabric Card Slot
Clock and Scheduler Functionality
The fabric card generates and distributes system-wide clock and cell time
synchronization signaling. System clock generation is delivered to the system
through the backplane and local clock functions are derived from the system
clock.
•
System Clock—The system clock synchronizes data transfers between line
cards or between the RP and a line card through the CSF. The system clock
signal is sent to all line cards and the RP.
•
Scheduler—The scheduler handles requests from the line cards for access to
the CSF. When the scheduler receives a request from a line card for CSF
access, the scheduler determines when to allow the line card access to the
CSF.
•
CSF—Switch fabric circuitry carries the user traffic between line cards or
between the RP and the line cards.
66293
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todd.book Page 24 Tuesday, November 27, 2007 6:02 PM