The CLK-7600 provides clocking signals to the EOBC channel and the switching bus. My understanding is, it is mandatory both on the 6500 and 7600 chassis and this part should come with the chassis by default.

You can do a show inventory and this should show the clk-7600 installed on the chassis.

For example:

7600# show inventory

NAME: "CLK-7600 1", DESCR: "OSR-7600 Clock FRU 1"

PID: CLK-7600 , VID: , SN:

NAME: "CLK-7600 2", DESCR: "OSR-7600 Clock FRU 2"

PID: CLK-7600 , VID: , SN:

Regards,

Arul

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