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2.6
Base Station Antenna Cable Connection
The base station antenna cable connection is through one 50-ohm N-type female connector. The
microBTS includes an internal duplexer which allows a single antenna cable to carry both
forward and reverse path RF signals between the base station antenna and the microBTS.
An externally-mounted lightning protector is available as an accessory. The surge/antenna
connector on the lightning protector is an N-type female connector. The microBTS enclosure
must be properly grounded for the lighting protector to function properly.
2.7
Powering
The microBTS is powered by 90 to 265 VAC (nominal 115 or 230 VAC), 47 to 63 Hz power.
The AC power is supplied through a 15-foot three-wire power cable that is provided with the
enclosure. The power cable connects to a mini 3-pin AC power connector mounted on the
bottom of the microBTS enclosure. The power cable is rated for indoor or outdoor use and must
not be placed within electrical conduit as this will impede the cooling of the cable during usage.
The stub end of the power cable must be routed to an external junction box (not provided) for
connection to the AC power source. A circuit breaker rated at 15 Amps (150 VAC) should be
used to provide overcurrent protection for the microBTS power circuit. It is also recommended
that an external AC outlet (not provided) be installed near the microBTS enclosure to power test
equipment and power tools.
2.8
Grounding
A grounding terminal (hex socket capscrew and washer) is provided on the bottom of the
enclosure for connecting a grounding cable to the enclosure. A 1.5 meter #6 stranded copper
wire terminated with a ring terminal is provided with the microBTS for linking the enclosure to
an earth ground source.
2.9
Cooling
Passive cooling of the electronic assemblies is provided by conducting excess heat from the
internal electronic components to the aluminum enclosure. The heat is then dissipated to the
outside air by radiation and convection air flow over the enclosure's external cooling fins. An
alarm is generated if a high temperature condition occurs within the enclosure.
2.10 User Interface
The microBTS user interface consists of the connectors, grounding lug, and LED that are
provided on the exterior of the enclosure. The microBTS user interface points are indicated in
Figure 2
and described in
Table
1.
ADCP-75-246 • Issue 1 • 6/2008
© 2008, ADC Telecommunications, Inc.
Page 3
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