Allied Telesis AT-9448Ts/XP (Basic Layer 3) - Manual (Page 58)

Chapter 2: Installing the Switch
58
5. Repeat this procedure to install a second XFP transceiver or go to
“Cabling the Twisted Pair or Fiber Optic Ports” on page 59.
For XFP optical and cabling specifications, consult the documentation
shipped with the module.