6
Reference Manual
00809-0200-4420, Rev HC
Section 2: Configuration
July 2015
Configuration
Power over Ethernet (PoE)
This Gateway is equipped with PoE technology to allow it to source power to a compatible
device over the connecting Ethernet cable (PSE mode) or derive its power from another PoE
device via the Ethernet connection (PD mode). This device complies with the IEEE 802.3at-2009
standard for PSE operation and IEEE 802.3af-2003 or IEEE 802.3at -2009 for PD operation. These
standards require the use of Category 5 Ethernet cable or higher.
In the operation of IEEE 802.3a, PoE power is only transmitted from one device to another when
the proper impedance match is made. This prevents damage to non PoE devices on the
network. In the Gateway, power is transmitted in passive mode over two unused differential
pairs of the Ethernet cable. To use this feature, the Gateway must be connected over the
Ethernet to a matching IEEE 802.3a device. Failure to do this will cause no power to be sent or
sourced.
A set of switches on the power supply board allow the selection of the specific Ethernet port for
PoE and the selection of whether it is a PSE (Power Sourcing Equipment) sourcing power or a PD
(Powered Device) deriving its power from another IEEE 802.9 PSE device. See Figure 2-3 for the
switch diagram required for PoE configuration.
Note
The Gateway can either source or receive power over an Ethernet port; it cannot do both at the
same time.
If using the Gateway as a PSE, the total additional power requirements of the PD must be
factored into the total input power requirements of the power supply for the Gateway. It is
recommended that the power selection mode switch be left in the PD position unless PSE is
needed.
When making physical connections to the Gateway it is important to use the electrical
conduit entries located on the bottom of the housing. Connecting through the open
terminal block cover (the lower cover) may stress the connections and damage the
Gateway.
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