Beijer Electronics QTERM®-A12 - Manual (Page 13)

Applying Power Optional Power-over-Ethernet Interface
QTERM-A12 Terminal 7
3.4 Optional Power-over-Ethernet Interface
The QTERM-A12 may be equipped with an optional Power-over-Ethernet (PoE) interface.
This interface may be used to power the terminal by connecting a PoE equipped Power Sourc-
ing Equipment (PSE) to the RJ45 connector on the rear of the terminal.
The QTERM-A12 PoE interface is functional with both IEEE 802.3af-2003 and 802.3at-2009
standards. If the terminal is connected to an IEEE 802.3af-2003 compliant network connection
the terminal will operate as a Type 1 Class 4 PoE device in a low-power condition not exceed-
ing 13 Watts average power consumption. The terminal will automatically disable both USB
ports while operating as a Type 1 Powered Device (PD) to ensure that the total average power
consumption remains lower than 13 Watts.
If the QTERM-A12 is connected to an IEEE 802.3at-2009 compliant network connection all
included features will be operational. In this mode, the terminal will complete 2-event classifi-
cation as specified by IEEE 802.3at-2009 and operate as a Type 2 Class 4 PoE Powered Device
(PD).
The QTERM-A12 will also operate from a non-compliant (simple Power-over-Ethernet with
no classification) PSE source if the source can supply up to 600 mA and maintain between
37.0 and 57.0 volts measured at the RJ45 connector on the terminal.
The QTERM-A12 will accept either Mode A or Mode B power connections as specified by
IEEE 802.3at-2009. The following table provides pinout information for both of these modes.
The polarity may be reversed in either mode.
N OTE
☞
The chassis ground connection MUST be connected to an external protective earthing system.
See
section 3.1, “Connecting to Earth Ground” for more information.
W ARNING
Although the terminal includes protection circuitry to prevent power supply contention,
power should not be connected to the 3-pin terminal strip or the DB9 connector while power
is applied to the RJ45 PoE interface.
Port Pin Assignment
Conductor Mode A Mode B
1 Tx+/V+ Tx+
2 Tx-/V+ Tx-
3 Rx+/V- Rx+
4 V+
5 V+
6 Rx-/V- Rx-
7 V-
8 V-