Allied Telesis AT-x510-52GTX Installationsanleitung PDF herunterladen (Seite 29)

x510 Series Installation Guide for Stand-alone Switches

of the power supplies fail or lose power. If you limit the power requirements

of the critical devices connected to a switch to less than 185 watts, the

PoE power provided by a single power supply, a switch will have sufficient

power to support the critical devices even if it has only one functional

power supply.

Wiring

Implementation

The IEEE 802.3af standard defines two methods for the delivery of DC

power over twisted pair cable by a PSE, such as the switch, to PDs. These

methods, known as modes A and B, identify the wires within the cable that

carry the DC power from the PSE to a PD.

Twisted pair cabling typically consists of eight wires. With 10Base-T and

100Base-TX devices, the wires connected to pins 1, 2, 3, and 6 on the RJ-

45 connectors carry the network traffic while the wires connected to pins 4,

5, 7, and 8 are unused. With 1000Base-T devices, all eight wires are used

to carry network data.

It takes four wires to deliver DC power to a PD. With Mode A, the power is

delivered on pins 1, 2, 3, and 6. These are the same pins in 10Base-T and

100Base-TX devices that carry the network data. With mode B, the power

is provided over the spare wires.

The ports on the AT-x510-28GPX and AT-x510-52GPX Switches deliver

the power using pins 1, 2, 3, and 6, which corresponds to mode A in the

IEEE 802.3af standard. Powered devices that comply with the IEEE

802.3af standard are required to support both power delivery methods.

Legacy devices that do not comply with the standard will work with the

switch if they are powered on pins 1, 2, 3, and 6.

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Allied Telesis AT-x510-52GTX Installationsanleitung Seite 29