Nitek ER8500U - Manual (Page 7)

IP Camera
Cable from
Head-end
48VDC Powered Transmitter Hookup Diagram
Link Port
Network
Port
115 VAC
Optional
48VDC
Supply
Optional Hookup for High Power PoE Devices
ET1500U Units
In some cases the PoE device connected to the transmitter needs more power than can be supported over a long
cable run. You can usually identify these cases by watching the POWER LED of the transmitter, located on the
“Network Port”. If the power light cycles ON for less then 1 second and then is off for 3 or 4 seconds when the PoE
device is connected, but it turns ON and operates normally without a PoE device connected, this would indicate you
are having a current limit problem.
You should first check the power requirements of the PoE device. Also check the length of the Link cable from head
-end to transmitter. The POE POWER CHART on the previous page will indicate the maximum power available for
your length of cable.
If the needed level of power is not available for the length of cable, used alternate options are available. One meth-
od is to directly power the transmitter with a 48VDC power supply as shown below (Nitek# PS48). When powered
directly from a 48VDC supply the transmitter can deliver full 802.3AT power regardless of the cable length plus an
additional length of up to 100 meters of network cable.
Transmitter used as
PoE Injector*
Distance from
Network Port
PoE Device Power
Available
30ft/10m 33 watts
325ft/100m 26 watts
* Results with 48VDC power to the
Transmitter optional Power Port