Page 5 of 12 Ethernet Extension Experts
INTRODUCING THE 350 POWER OVER ETHERNET INJECTOR
Congratulations on purchasing the Enable-IT’s 350 Power Over Ethernet Injector — the
simplest to enable your Power Over Ethernet devices.
The 350 Power Over Ethernet Injector offers a low cost single port solution in a simple design
for rapid install using existing Ethernet cabling.
This chapter contains introductory information about The 350 Power Over Ethernet Injector and
how it can be used in your network. It covers the following topics:
About the 350 Power Over Ethernet Injector
Key Benefits
Summary of Features
Typical Applications
About the 350 Power Over Ethernet Injector
The 350 Power Over Ethernet Injector solves the problem of high costs associated with adding
additional electrical outlets in hard to reach places for your LAN equipment such as Wireless
Access points or security cameras.
Power-Over-Ethernet (PoE) Compatible
The 350 is a Compact IEEE 802.3af standard Power Over Ethernet Injector which provides 48
VDC over any wiring and up to unexpected extended distance. The units are fully compatible
with industry-standard IEEE 802.3af Power-over-Ethernet (PoE) devices and 10/100 Base-T
Ethernet networks, providing both Ethernet data pairs as well as the PoE DC power feed.
48 Volts are applied on pins 4, 5, 7 and 8 in separate lines not bridged. The units are compatible
with both normal and inverted polarity voltage PoE equipment.
For maximum distance, PoE travels very very far down any type of wiring. Voltage drops over
distance using wires. At 200M, you lose maybe 4 or 6 volts. At 48VDC, that leaves you with 42
volts. You can determine the amount of voltage drop over a distance by finding the resistance of
the cable for a specific temperature (given in ohms/1000ft) from the cable manufacturer or
electrical wholesaler. If you know the largest amount of current that will flow in the cable, when
use the formula: Vdrop = Current X Distance (Ft) X 2 X Ohms per 1000Ft.
As a rule of thumb you will loose 6V per every 100′ - 200′ of wiring, depending on the gauge.
Lower power also means more amperage means more heat and perhaps issues with the 24
gauge wires in CAT5. You may need to use 18 gauge wiring. For all intensive purposes
anything greater than 400′ use a 48V POE.
Keep in mind that Ethernet data has a limit of 328ft or 100m. You can easily solve this
issue by using the Enable-IT 350 PoE Injector with an Enable-IT 865 PoE Ethernet
Extender kit. Using the 865 kit will drive your PoE and data up to 1,500ft.
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