User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 2: Description
Page 2-10
© 2004, ADC Telecommunications, Inc.
3.4 Antenna Cable Connection
The antenna cable connection between the STM and the antenna is supported through a single
N-type female connector. The single connector is used for the antenna cable which carries both
the forward and primary reverse path RF signals.
3.5 RF Signal Level Adjustment
The STM 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 STM and the HU are supported through two SC-type
optical connector ports. One port is used for the forward path optical signal connection and the
other port is used for the reverse path optical signal connection.
3.7 Service Interface Connection
The service interface connection between the STM and a local laptop computer loaded with the
EMS software is supported by a single DB-9 female connector. The service interface connector
provides an RS-232 DTE interface. The STM service interface supports local communications
with both the STM and the corresponding HU.
3.8 Auxiliary Interface Connection
An auxiliary communication link is provided between the HU and the STM for customer use.
The auxiliary interface is supported by a single DB-9 female connector. The auxiliary connector
provides an RS-232 DTE interface. The auxiliary communications link can be used to remotely
monitor and control other network equipment that may be located at the remote unit site such as
the antenna.
3.9 Powering
The STM is powered by 120 or 240 VAC (50 or 60 Hz) power which is supplied through a
three-conductor AC power cord. The power cord is provided with the RU outdoor cabinet or
indoor mounting shelf. The power cord connects to a 3-wire AC connector mounted on the front
panel. A switch on the STM front panel provides AC power On/Off control.
The STM (and the connected LPA) may be powered by a 24 VDC back-up battery system
which is available as an accessory kit. A connector is provided on the STM front panel for the
back-up battery system wiring harness connection.