Specifications

4
Cisco 12010, Cisco 12410, and Cisco 12810 Router Clock and Scheduler, Switch Fabric, and Alarm Card Replacement Instructions
OL-13810-01
Alarm Card and Alarm Display Overview
The SFC contains only the switch fabric circuitry, which carries user traffic between line cards or
between the RP and the line cards. The SFC receives scheduling information and the system clock sent
from the CSC.
LEDs on the faceplate of the external alarm display card display the status of the cards in the switch
fabric and alarm card cage. The alarm display card faceplate has one pair of LEDs for each of the nine
card slots (seven fabric cards and two alarm cards) in the switch fabric and alarm card cage.
Each pair of LEDs consists of a green LED labeled ENABLED and a yellow LED labeled FAIL. When
a green LED is on, the CSC or SFC in the corresponding slot is installed and operational. When the LED
is off, either the slot is empty or the card installed in the slot is faulty. When a yellow LED is on, the
router detects a fault on the card in the corresponding slot.
Switch Fabric Card Redundancy
On the 10-slot chassis, the CSC's are only used for clocking purposes and do not carry any data traffic.
There are 5 SFC cards which carry the traffic. 4 of the SFCs carry the actual traffic, while the 5th SFC
is for redundancy purposes in case one of the SFC's fail. The interfaces between the line cards and the
switch fabric are monitored constantly. If the system detects a loss of synchronization (LOS), it
automatically activates the data paths of the redundant SFC, and data flows across the redundant path.
The switch to the redundant CSC occurs within sub-seconds (the actual switch time depends on your
configuration and its scale).
Alarm Card and Alarm Display Overview
The router alarm and alarm display system consists of two alarm cards that are located in the switch
fabric and alarm card cage and an alarm display mounted on the front of the chassis below the blower
module (Figure 2).
Note The two alarm cards located in the switch fabric and alarm card cage are not part of the switch fabric.
The switch fabric and alarm card cage is located behind the air filter door. The two alarm cards are
located in the two right-most slots, which are labeled Alarm, in the switch fabric and alarm card cage.