Allied Telesis Layer 3 Gigabit Ethernet Switch x600-24Ts/XP - Manual (Page 45)

x600 Layer 3 Gigabit Ethernet Switch Installation Guide
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Note
A 10/100/1000Base-T twisted pair port must be set to Auto -
Negotiation to operate at 1000 Mbps. You cannot manually set the
speed of a twisted pair port to 1000 Mbps.
Optional
Transceiver
Cable
Specifications
The cable specifications for an optional SFP or XFP transceiver can be
found in the transceiver’s installation guide that is shipped with the device.