Allied Telesis AT-8516F/SC Installation Manual page 59

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The most common source of contaminants in the optical bore
is debris picked up on the ferrules of the optical connectors.
Use an alcohol swab or wipe to clean the ferrules of the optical
connector.
Note
Unnecessary removal and insertion of a SFP module can lead to
premature failure.
4. Slide the SFP module, with the label side up, into an SFP expansion
slot on the switch. The SFP module can be installed in either slot.
The SFP module is completely seated in the slot when it clicks into
place.
Note
Do not remove the dust cover from the SFP module until you are
ready to install the fiber optic cable. When you do remove the dust
cover, keep it for future use.
5. If you purchased two SFP modules for the switch, repeat this
procedure to install the second module.
AT-8500 Series Fast Ethernet Switch Installation Guide
59