User's Manual Part 1

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 2: DESCRIPTION
Page 2-11
© 2005, ADC Telecommunications, Inc.
3.4 Antenna Cable Connection
The antenna cable connection between the RU and the antenna is supported through a single N-
type female connector. The N-type connector provides a connection point for the antenna cable.
The forward and reverse path RF signals are combined on the same antenna cable. It is
recommended that a lightning protector (accessory item) be connected to the antenna port prior
to connecting the antenna cable. On an optional basis, the dual-band RU may be equipped with
two N-type connectors to support antenna connections to two separate antennas.
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 one OptiTap hardened optical connector 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 OptiTap hardened optical connector
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.
An APC/SC (angled) connector and adapter is mounted within each OptiTap optical port. Drop
cables terminated with OptiTap connectors are available separately. The stub end of each drop
cable must be routed to an external splice enclosure (not provided) for splicing to the Outside
Plant (OSP) fiber optic cable.
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 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 cable is UL and National
Electrical Code (NEC) approved for continuous outdoor exposure without conduit.
3.8 Cooling
Passive cooling of the electronic assemblies is provided by conducting excess heat from the
electronic components to the aluminum enclosure. The heat is 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. If necessary, the RU may
be equipped with solar shields (accessory) that reduce the effect of solar loading on the
aluminum enclosure.