Cisco AIR-1520-FIB-REEL= wireless access point accessory WLAN access point SFP gland/adapter

Connecting a Fiber-Optic Cable to the Access Point
The fiber-optic kit (AIR-1520-FIB-REEL=) enables the access point to support fiber-optic network connections. The kit contains these parts:

Eight screws
Two small take-up reels
Two large take-up reels
One liquid-tight adapter—Accepts a cable diameter of 0.20 to 0.35 inches (0.51 to 0.89 cm)