User's Manual

Installation and Initialization MP.11 4954-R Installation and Management
Hardware Overview
15
Hardware Overview
The 4954-R unit contains a state-of-the-art wireless radio, an optional high-gain performance flat-panel antenna, and
Power-over-Ethernet (the sole means of power for the unit). For further protection, the unit has internal, built-in surge
protection.
Power-over-Ethernet
The unit is equipped with a Power-over-Ethernet (PoE) module. Using PoE, you can provide electricity and wired
connectivity to the unit over a single Category 5 cable. Although the power injector that is supplied with the unit is
802.3af-compatible, standard 802.3af-compliant power modules will not properly power the units. Always use the
supplied power injector.
• The PoE integrated module provides –48 VDC over a standard Cat5 Ethernet cable.
• Maximum power supplied to the unit is 20 Watts (when the unit is heating or cooling); the units typically draw less than
7.5 Watts.
• The unit only accepts power on the “extra pairs”, not on the data pairs according the configuration for “midshipman”
power injection, see the IEEE 802.3af standard.
Between 0 and 55° Celsius internal temperature, the unit does not need to regulate its temperature, so the power draw is
generally lower in this temperature range. When the internal temperature gets close to the limits, the unit starts to heat/
cool itself and the power draw increases. Powering while cold triggers a special self-heat mode where the unit is
inoperable until the temperature is above 0° deg Celsius. This is signaled by a solid red LED on the Ethernet connector.
Once the internal temperature is above 0 degrees Celsius, the unit boots normally.
Serial Connection
The serial connection is made with an RJ11 to DB9 connector (also referred to as a “dongle”). Connect the RJ11 end to
the unit and connect the serial (DB9) end to your PC to assist you in aligning the antenna and to issue CLI commands.
See the following figure:
Recommended Cable
Function Power (DC) and Ethernet connection
Type Cat5, UV-shielded and outdoor-rated
Impedance 100 ohms
Recommended cables 4 UTP, 24 AWG, UL rated
Maximum Distance 330 feet / 100 meters
Connector type, unit end RJ45 female, weatherized using weatherproof connector
Connector type, power & Ethernet adapter
end
RJ45