Cisco AIR-SFP-KIT1= wireless access point accessory WLAN access point SFP gland/adapter

The optional Cisco accessory fiber-optic kit enables the AP to support fiber-optic network connections.

You can connect the fiber-optic networking cable to the SFP port. The small form-factor pluggable (SFP) transceiver module connects the cable to the SFP port.