Switch Fabric Card Functionality; Clock Scheduler Card; Switch Fabric Card - Cisco 12410 Installation And Configuration Manual

Switch Fabric and Alarm Card Overview

Switch Fabric Card Functionality

Clock Scheduler Card

Switch Fabric Card

Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
1-10
Chapter 1
Routers ship from the factory with 2 CSCs and 5 SFCs installed in the 7 slots in
the switch fabric and alarm card cage (see
CSCs are installed in slot 0 (CSC0) or slot 1 (CSC1).
•
SFCs are installed in slot 2 (SFC0), slot 3 (SFC1), slot 4 (SFC2),
•
slot 5 (SFC3), and slot 6 (SFC4).
Clock scheduler cards provide the following functionality:
• Scheduler—Handles all scheduling requests from the line cards for access to
the switch fabric.
System clock—Supplies the synchronizing signal to all SFCs, line cards, and
•
the RP. The system clock synchronizes data transfers between line cards or
between line cards and the RP through the switch fabric.
Switch fabric—Carries user traffic between line cards or between the RP and
•
a line card. The switch fabric on the CSC is identical to the switch fabric on
the SFC.
The second CSC provides redundancy for the data path, scheduler, and reference
clock. Traffic between the line cards and the switch fabric is monitored constantly.
If the system detects a loss of synchronization (LOS), it automatically activates
the data paths on the redundant CSC so data flows across the redundant paths. The
switch to the redundant CSC occurs within sub-seconds (the actual switch time
depends on your configuration and its scale).
The switch fabric cards augment the traffic capacity of the router. SFCs contain
switch fabric circuitry that can only carry user traffic between line cards or
between the RP and the line cards. SFCs receive all scheduling information and
the system clock signal from the CSCs.
Cisco 12010, Cisco 12410, and Cisco 12810 Series Router Overview
Figure 1-2).
OL-11496-01