Nitek ET1551U - Manual (Page 3)

Parts of the ET1551U
Wire and Cable Recommendations: The ET1551U is designed for use with copper based 24AWG Twisted
Pair (CAT3 or CAT5) cable, but can be used with other types of UTP cable like 18AWG. The cable quality
must be consistent with any reasonably serviceable cable condition. It must be free from damage such as
cuts, breaks, or cracks to the outer covering and insulated shielding which may compromise the signal con-
ductivity of the cable.
For more specific information regarding wire types, gauges, and proper installation techniques please call
Tech Support at (847)259-8900 or (800)528-4343.
Ethernet & PoE: The ET1551U is designed to transmit and receive up to 100Mbps of Ethernet data at a max-
imum distance of 1,600ft / 500m. Before considering this solution be sure that the cable involved does not
exceed the recommended maximum length. If the cable length is indeterminate at the time of installation, we
recommend the use of a Ohm meter and do a loop resistance test to determine unknown cable distances. A
TDR (Time Domain Reflectometer, which through the use of short rise time pulses cam measure impedance
characteristics, splices, and unknown cable distance estimates) could also be used.
Installation Considerations
UTP Side of Device Network Port Side
10/100 Link LED Indicator
 On Solid = 100Mb
 Flashing = 10Mb
 Off = No Link
Link Status LED Indicator
 On Solid = Ethernet Link
 Off = No Ethernet Link
Power LED Indicator
 On Solid = The Unit is powered
and ready to use
 Off = The unit is not powered
PoE Out LED Indicator
 On = PoE is being provided
out the network port
 Off = PoE is “not” being sent
out the network port
UTP Connector
 Attaches to twisted
pair wires
Optional Power Input
 Class II 48-56VDC input to create PoE
in installations where a PoE switch is
not available.
 On Receiver used to power the system
when a PoE switch is not available.
 On Transmitter used to provide greater
PoE power out the network port.