User Manual

ADCP-75-187 • Issue 3 • September 2006 • Section 2: DESCRIPTION
Page 2-11
© 2006, ADC Telecommunications, Inc.
3.4 Antenna Cable Connection
The antenna cable connection between the RU and the antenna is supported through either one
(single-band RU) or two (dual-band RU) 50-ohm N-type female connectors. The antenna cable/
cables carry the forward and reverse path RF signals between each antenna and RU. An
externally-mounted lightning protector is available as an accessory. The antenna connector on
the lightning protector may be either an N-type female connector or a 7/16 mm DIN connector.
The RU enclosure must be properly grounded for the lighting protector to function properly. On
an optional basis, the dual-band RU may be equipped with one N-type connector (and internal
diplexor) to support operation with a single antenna.
3.5 RF Signal Level Adjustment
The RU is equipped with digital attenuators for adjusting the signal level of the forward path RF
output signals. The remote forward path attenuators adjust the level of the two output RF
signals at the RU antenna port and will add from 0 to 31 dB of attenuation to the output signal
level. The attenuator can be set in 1 dB increments. The attenuator is software controlled and is
adjusted through the EMS software GUI, the NOC/NEM interface, or SNMP interface.
3.6 Optical Connection
Fiber optic connections between the single-band RU and the associated HU are supported
through a single hardened optical port. All single-band RU’s are equipped with an internally
mounted Wavelength Division Multiplexer (WDM). This allows a single optical port to provide
the optical fiber connection for the combined forward and reverse path signals.
Fiber optic connections between the dual-band RU and the two associated HU’s (two HU’s are
required with a dual-band RU) are supported through two hardened optical ports. All dual-band
RU’s are equipped with two internally-mounted WDM’s. One port provides the optical fiber
connection for the combined forward and reverse path signals for HU #1. The other port provides
the optical fiber connection for the combined forward and reverse path signals for HU #2.
Each hardened optical port houses an SC adapter. A standard APC/SC type connector is
connected to the internal side of the adapter. The optical port accepts drop cables that are
terminated with APC/SC hardened connectors. The optical port is also compatible with OptiTap
connectors manufactured by Corning Incorporated.
3.7 Powering
The RU is powered by 90 to 265 VAC (nominal 120 or 240 VAC), 47 to 63 Hz power. On an
optional basis, the RU may be powered by 60 to 89 VAC, 47 to 63 Hz power. The power is
supplied through a 20-foot three-wire AC power cable that is provided with the RU. The power
cable connects to a mini 3-pin power connector mounted on the bottom of the RU enclosure.
The stub end of the cable must be hard-wired to the AC power source. The power cable is rated
for indoor or outdoor use and must not be routed through conduit. Accessory power cables are
also available separately in lengths of 40, 60, or 100 feet.