H3C Technologies H3C S12500-X Series Switches - Manual (Page 2)

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4. Holding the module, gently push in the module until it is firmly
seated in the port.
If you cannot hold the module by its two sides because of high
module density, press the module on its head end to push it in.
The slot for the CXP transceiver module is foolproof. If you cannot
insert it into the slot, re-orient the module rather than use excessive
force to push it in.
5. Install the dust plug if no optical fiber is installed in the module.
Figure 1 CXP transceiver module installation direction