Allied Telesis x600-48Ts Installation Manual page 43

x600 Series Layer 3 Gigabit Ethernet Switches Installation Guide
IEEE 802.3af compliant PD's typically support both power delivery
methods. So long as a PD conforms with the standard, it should be able to
receive its power from the switch with either a straight or cross-over cable.
The PoE feature on the x600-24Ts-POE Gigabit Ethernet Switch will work
with legacy PD's as long as the device can be powered on pins 1, 2, 3, and
6. A legacy device is a node that was manufactured before the IEEE
802.3af standard was completed and may not be compliant. If the device
does not conform to the standard, a cross-over cable may be required to
insure that the correct DC polarity is supplied to the device.
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