Power Over Ethernet (Poe); Maximum Poe Budgets - Allied Telesis GS950 PS V2 Series Installation Manual

Chapter 1: Overview

Power over Ethernet (PoE)

Maximum PoE
Budgets
26
The GS950 PS V2 Switches feature PoE on the copper ports. This feature
enables the switch to supply power to network devices over the same
cables that carry the network traffic. The value of PoE is that it can make
installing a network easier. Selecting locations for network devices are
often limited by whether there are power sources nearby. This often limits
equipment placement or requires the added time and cost of having
additional electrical sources installed. But with PoE, you can install PoE-
compatible devices wherever they are needed without having to worry
about whether there are adjacent power sources.
A device that provides PoE to other network devices is referred to as
power sourcing equipment (PSE). The GS950 PS V2 Switches act as PSE
units by adding DC power on the network cables connected to its ports,
thus functioning as a central power source for other network devices.
Devices that receive their power from a PSE are called powered devices
(PD). Examples include wireless access points, IP telephones, webcams,
and even other Ethernet switches.
The switches automatically determine whether or not a device connected
to a port is a powered device. Ports that are connected to network nodes
that are not powered devices (that is, devices that receive their power from
another power source) function as regular Ethernet ports, without PoE.
The PoE feature remains activated on the ports but no power is delivered
to the devices.
The maximum PoE budgets are the total amounts of power the switches
can supply to powered devices on their ports. The maximum PoE budgets
of the switches are listed in Table 2.
Table 2. PoE Maximum Power Budgets and Ports
Switch
GS950/10PS V2
GS950/18PS V2
GS950/28PS V2
GS950/52PS V2
1. Copper ports 25 to 48 on the GS950/52PS V2 Switch do not support PoE.
PoE Budget
75W
185W
185W
370W
PoE Ports
1 to 8
1 to 16
1 to 24
1
1 to 24