Allied Telesis AT-9408LC/SP manual XFP Transceiver Slots, Shows an example of an XFP transceiver
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AT-9400 Series Gigabit Ethernet Switches Installation Guide
XFP Transceiver Slots
Several AT-9400 Switches have slots for optional XFP 10 Gigabit Ethernet transceivers to connect high speed, 10 gigabit devices to the switch or create high speed backbone networks between switches.