5
Technical Note
00840-1600-4420, Rev AA
Smart Wireless Gateway 1420 with Power over Ethernet (PoE)
May 2015
Smart Wireless Gateway 1420 with Power over Ethernet (PoE)
What is the maximum Voltage PoE PSE can source?
Maximum Voltage is normally 48 VDC; up to 25 Watts.
Can you do redundant power with PoE?
Yes, as PoE becomes more popular many network appliance (switch) providers are supplying
innovative switches and other hardware to create redundantly powered networks. Typically,
many switch suppliers offer switches that allow multiple power inputs. Check your local switch
supplier as to available configurations. Also, the Gateway will work with a local power supply
connected to the power input terminals of the Gateway and as a PD with power coming over the
ethernet at the same time. If both sources are present, the Gateway selects the local power
supply first. If the local power fails, the Gateway automatically switches to ethernet power.
When the local power is restored, the Gateway automatically returns to local power.
How do I know if my 1420 Gateway has IEEE PoE capability?
The simplest way to check for IEEE PoE capability is to open the upper door on the 1420 Gateway
and the see how the computer board is mounted. In the newer hardware, the board is mounted
horizontally. The old hardware the computer board was mounted vertically.
Are there other changes in the 1420 with the new hardware?
Emerson's Quality Policy is to continuously improve our products year after year. The following
is a list of some improvements with the new hardware:
Ethernet connectors in line with conduit holes
A fast disconnect circuit protects from someone inadvertently wiring Gateway to high
voltage or AC Mains (circuit resets when improper power is removed)
More area freed up for installer wiring in lower section
Total number of circuit boards, wires and connectors is greatly reduced
(1) Depending on approval status.
Computer
board
1420
with PoE
1420
no PoE
Computer
board
Gateways Shipped
2014 - present
with N5/N6 option
(1)
Gateways Shipped
2011 - 2014
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