Optional Hookup for High Power PoE Devices
ET1500C or ET4500C Units
9) In some cases the PoE device connected at the transmitter end needs more power than can be supported over a long
coaxial 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.
10) You should first check the power requirements of the PoE device. Also check the length of the coaxial cable. The
POE POWER CHART on the previous page will indicate the maximum power available for your length of coax.
11) If the needed level of power is not available for the length of coaxial cable, alternate options are available. One
method is to directly power the transmitter with a 48VDC power supply as shown below (Nitek# PS48). When pow-
ered directly from a 48VDC supply the transmitter can deliver full 802.3AT power regardless of the coaxial cable
length plus an additional length of up to 100 meters of network cable.
Distance from
Network Port
PoE Device Power
Available
33ft/10m 33
watts
328ft/100m 26
watts
Transmitter used as
PoE Injector*
*
Results with 48VDC power to the
Transmitter optional Power Port
ET1500
PS48
IP Camera
Coax from
Head-end
48VDC Powered Transmitter Hookup Diagrams
Link Port
Network
Port
115 VAC
Optional
48VDC
Supply
48Vdc
Power
Supply
ET4
500
C
IP 1
IP 2
IP 3
IP 4
IP Device
115/230 VAC
IP Camera
IP Camera
IP Camera
Coax from
Head-end
Link Port
Network
Ports
