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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Chapter 6 Maintaining the Router
Removing and Installing a Clock and Scheduler Card, Switch Fabric Card, or Alarm Card
Tools and Equipment
You need the following items to remove and replace a CSC, an SFC, or an alarm
card:
• ESD-preventive strap
• 3/16-inch flat-blade screwdriver
• Antistatic bag or similar ESD-preventive container
Removing and Installing a Clock and Scheduler Card
A Cisco 12006 or Cisco 12406 Router configured for redundant CSCs will have
two CSCs installed in the two CSC slots; a router configured for nonredundant
operation will have one CSC installed in one of the CSC slots, and will have a
CSC blank filler installed in the second CSC slot. (See Figure 6-31.) Figure 6-32
shows a partially ejected CSC.
Note The CSCs support OIR, so when the router is equipped with two CSCs, you can
remove either CSC while the system remains powered up. In a router equipped
with only one CSC, you must shut down the router before removing the CSC.
Caution When removing CSCs or CSC blank fillers, remove each component entirely from
the chassis and place it in an ESD-safe environment. Do not allow the card or
blank to rest partially inserted into the slot, as this will damage the
electromagnetic interference (EMI) shielding on the card in the slot directly
below.
Caution Two CSCs (redundant configuration) are required to support CSC online insertion
and removal (OIR). This allows you to remove and replace a CSC or an SFC while
the system remains powered on. If only one CSC is present, do not remove any
cards while the system is powered on.
Procedures for removing and installing a CSC are described in these sections:
• Removing a Clock and Scheduler Card, page 6-58
• Installing a Clock and Scheduler Card, page 6-59