there are 5 redundancy modules (also called mux buffers) and 1 clock module on a catalyst 4507r chassis backplane. a catalyst 4510 has 8 redundancy modules on its backplane. they are accessible from the front if the switching modules and supervisor engines are removed. there are two types of redundancy modules, and they are interchangeable.

    the clock module replacement procedure is identical to the redundancy module replacement procedure, the connectors are the same. these modules are not hot-swappable, the switch must be taken out of service to replace them.

    to replace the backplane modules:

    step 1 make sure you are grounded with an esd strap.

    step 2 turn off the power to the chassis.

    step 3 remove all supervisor engines and switching modules from the chassis, and find the backplane modules you need to replace.

    keep a record of switching moduleand their slots, so that you can put them back correctly.

    generic switching module replacement procedures are documented at:

    http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/hw_doc/gmdcf_nt.htm#wp21932

    figure 4-21 shows the front view of the backplane with supervisors and switching modules removed.

   

    step 4 if you are removing a clock module, remove the two screws that attach the module to the backplane.

    step 5 find the seating levers on both sides of the connector for the module you wish to replace. (see figure 4-22.)

   

    step 6 to release the module from its connector, pull the levers outward with your fingernails. the module will pop out slightly. (see figure 4-23.)

   

    step 7 pull out the module while holding the top left and top right corners. (see figure 4-24.)

    when handling the modules, do not touch the chips or the gold edge contacts on the module.

   

    step 8 put the replacement module in at roughly a 30 degree angle, and gently push the module down. make sure you apply force evenly on the left and right. (see figure 4-25.)

   

    step 9 make sure the module is fully seated. (see figure 4-26.)

   

    step 10 push the module toward the back of the chassis and make sure it is clipped in by the levers on both sides. (see figure 4-27.)

   

    step 11 repeat step 4 to step 10 for the other modules you need to replace.

    step 12 if you are installing a clock module, secure the module to the backplane using the screws from the earlier removal.

    step 13 replace the supervisor engines and switching modules to their previous slots.

    step 14 restore power to the switch.