Equipment Requirements & Mounting: The process for utilizing the EL1551U is quick and easy. A
common topology involves a length of existing single twisted pair cable up to 1,600ft / 500m, the
EL1551U transmitter and receiver pairs (ET1551U & ER1551U), an IP camera or other peripheral net-
work device, referred to as the Powered Device or PD, and a 3rd party PoE network switch or Power
Sourcing Equipment/PSE. The PD and PSE should both be either 802.3af or 802.3at compliant. That is
requiring or producing no more then 15.4 W for 802.3af and up to 25.5W for 802.3at PoE power.
The method for facilitating Ethernet communication over single twisted pair cable starts with connecting
the ER1551U to the Power Sourcing Equipment, usually a switch RJ45-to-RJ45 via a CAT5e/CAT6
patch cable. The ER1551U two-position plug enables connectivity to the length of single twisted pair ca-
ble at the head end. The IP camera interfaces with the ET1551U via network port RJ45 and a CAT5e/
CAT6 patch cord. The Link Port of the ET1551U intern connects to the length of single twisted pair cable
by its two-position plug at the camera end. Power from the PSE can provide operational power for both
EL1551U units. An illustration of this is represented below in the “Installment Topology - Type A” dia-
gram.
Upon final power up the devices will undergo initialization and auto-configuration processes (see LED
Indicator chart on page 7) which may take a number of seconds, time variations are device/installation/
topology dependent, to complete before PoE and Ethernet communication commences. If issues arise
during the installation process please see the “Trouble Shooting Tips” section (page 8). You may also
contact our web based live tech support at: www.nitek.net
; call (800) 528-4343 in the USA, and (847)
259-8900 from outside the USA in order to speak with one of our engineers directly.
Installment Topology - Type A
Shown in the diagram above, are the EL1551U device includes a transmitter and a receiver unit.
They are connected to an existing single twisted pair cable which enables the transmission of up
to 100Mbps of network data. Power for the units is derived from the 3rd party PoE network
switch. Total distance, via single twisted pair cable, between the EL1551U devices cannot
exceed 1,500ft./460m.
PoE
Data
IP PoE
Camera
Single Twisted Pair Cable
up to 100Mbps
at 1500ft/460m
PoE Network Switch
PTZ Controller
NVR/ Video Server
Monitor
Installation & Setup
Data
(2 pages)
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