Allied Telesis AT-x510-28GTX User Manual
x510 Series Installation Guide for Stand-alone Switches
29
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.
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.
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.
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.
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.
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.