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2-10
Installing the Hub
Use of media module keys is optional. They can be used to ensure that the
correct cable is inserted into each fiber transceiver.
Once a key is in place, you can only insert the cable connector specified by that
key into the transceiver. However, if the cable connector is universally keyed, it
will fit into any transceiver regardless of its inserted key.
You should insert the keys into the transceivers before installing the fiber module.
Insert one key into the top of each transceiver as described below and shown in
Figure 2-5:
1.
2.
3.
Figure 2-5. Inserting a Type M Key into a Fiber Transceiver
Determine the type of configuration that you want for the two
attachment ports on the fiber module.
Refer to the sections "Planning Connections" later in this chapter and "Port
Connections" in Chapter 3 for help in determining your hub connection plan.
Choose the appropriate key (A, B, M, or S).
The key types are identified by letters on the top of the key.
Insert the tabbed end of the key through the opening in the top of the
transceiver receptacle, and fit it in place.
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