User's Manual

Grounding, Power and Surge Arrestors
35
Horizon Compact Release 1.01.01 Wireless Ethernet Product User Manual – Volume 1
8.1 Power on Ethernet (PonE)
The copper interface variant of Horizon operates on -48 VDC and employs a proprietary Power on
Ethernet solution. The Horizon Power on Ethernet surge arrestor unit provides integration of -48 VDC
and the two straight through Ethernet cables.
Note: The Horizon PonE implementation is proprietary and does not follow IEEE standards.
The surge arrestor uses RJ-45 connectors for the Ethernet cables and screw -terminals for the -48 VDC
power connections. Dual -48 VDC power connectors are provided, allowing for the connection of
redundant power supplies.
The surge arrestor unit contains protection against cable transients and power surges caused by lightning
or other sources. The surge arrestor is installed at the opposite end of the Cat5E/ PonE cables to that of
the Horizon unit and protects the network.
To ensure adequate lightning protection, the PonE surge arrestor unit must be properly grounded.
Horizon consumes a nominal 20 Watts (standard power), or 40 Watts (high power variant) from the -48
VDC supply. All eight of the wires in the Ethernet cable are used to carry power to the Horizon Compact
unit. The Power on Ethernet surge arrestor unit is rated at 2 amps.
CAUTION
Serious damage to network switches or routers can occur if
the network is plugged into the connectors marked “TO
HORIZON UNPROTECTED”. Power is fed to the Horizon unit
along the same wires that carry Ethernet traffic to the
Horizon unit. Do not, under any circumstances, plug cables
connected to the network into the RJ-45 connectors marked
“TO HORIZON UNPROTECTED”.
CAUTION
Only use straight through Ethernet cables to connect the
PonE adapter to the Horizon Compact. Using cross-over
cables will result in damage to the Horizon Compact unit.
CAUTION
Connect the Cat5E cables to the Horizon Compact BEFORE
applying power to the PonE surge arrestor unit.