Allied Telesis AT-x230-10GP Installation Guide download pdf (Page 31)

AT-x230-10GP and AT-x230-18GP Switches Installation Guide

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-x230-10GP and AT-x230-18GP 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-x230-10GP Installation Guide Page 31