ADC DVLRCSPCS Users Manual
FCC ID: F8I-DVLRCSPCS - User Manual - Part 2
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
4 SPECTRUM TRANSPORT MODULE
The Spectrum Transport Module (STM), shown in Figure 2-5, serves as the handset servicing
device for the Digivance LRCS. The STM provides the following basic functions:
• Provides an RF interface (antenna ports) to the remote antenna(s).
• Provides an optical interface to the HU.
•Converts the digitized forward path optical signal to a digitized RF signal.
•Converts the digitized RF signal to a composite RF signal.
• Digitizes the reverse path composite RF signal.
•Converts the digitized reverse path RF signal to a digitized optical signal.
• Provides an RS-232 interface for connecting a local EMS computer.
• Transports alarm, control, and monitoring information via the optical link.
• Provides AC power input and battery power input.
• Provides external alarm input.
Page 2-12
© 2002, ADC Telecommunications, Inc.
17528-A
NOTE: UNIT SHOWN INCLUDES
DIVERSITY OPTION
Figure 2-5. Spectrum Transport Module
4.1 Primary Components
The STM consists of an electronic circuit board assembly, power supply, duplexer, and fan
assembly that are mounted within a powder-coated sheet metal enclosure. The metal enclosure
provides a mounting point for the electronic components and controls RF emissions. Except for
the fan unit, the electronic components are not user replaceable. The STM is designed for use
within the RU cabinet. Except for the LPA interface connector, all controls, connectors,
indicators, and switches are mounted on the STM front panel for easy access. A carrying handle
is provided on the front of the STM to facilitate installation and transport.
4.2 Mounting
The STM mounts on a shelf within the RU cabinet. A runner on the bottom of the STM meshes
with a track on the mounting shelf. The runner and track guide the STM into the installed
position. The electrical interface between the STM and LPA is supported by a D-sub female
connector located on the rear side of the STM. A corresponding D-sub male connector mounted
at the rear of the RU cabinet mounting shelf mates with the STM connector. Captive screws are
provided for securing the STM to the mounting shelf.
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
4.3 Fault Detection and Alarm Reporting
The STM detects and reports various faults including remote unit fault, optical fault, power
fault, temperature fault, power amplifier fault, and external (door open) fault. Various front
panel Light Emitting Diode (LED) indicators turn from green to red or yellow if a fault is
detected. The status of the STM, the alarm state (major or minor), and other alarm information
is summarized and reported over the optical fiber to the HU and also over the service interface.
In addition, the alarm state of the HU is received over the optical fiber and reported to the
service interface. This information may be accessed remotely through the NOC/NEM interface
or locally through the EMS software GUI.
4.4 Antenna Cable Connection
The antenna cable connections between the STM and the antenna are supported through either
one (non-diversity unit) or two (diversity unit) N-type female connectors. On non-diversity
units, a single connector is used for the antenna cable which carries both the forward and
primary reverse path RF signals. On diversity units, a second connector is used for the diversity
antenna cable which carries only the diversity reverse path RF signals. The STM does not
connect directly to the antenna but instead connects to a lightning protector that is mounted on
the bottom of the RU cabinet (see Section 3.5). A coaxial jumper cable is provided (included
with the enclosure) for connecting the STM connector to the lightning protector.
4.5 RF Signal Level Adjustment
The STM is equipped with a digital attenuator for adjusting the signal level of the forward path
RF output signal. The remote forward path attenuator adjusts the level of the output RF signal
at the RU antenna port and will add from 0 to 30 dB of attenuation to the output signal level.
© 2002, ADC Telecommunications, Inc.
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ADCP-75-126 • Issue B • April 2002 • Section 2: Description
The attenuator can be set in 1 dB increments. The attenuator is software controlled and is
adjusted through the NOC/NEM interface or the EMS software GUI.
4.6 Optical Connection
Fiber optic connections between the STM and the HU are supported through either two (nondiversity unit) or three (diversity unit) SC-type optical connector ports. On non-diversity units,
one port is used for connecting the forward path optical signal and the other port is used for
connecting the primary reverse path optical signal. On diversity units, a third optical port is used
for connecting the diversity reverse path optical signal.
4.7 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 connector supports local
communications with both the STM and the corresponding HU.
4.8 Powering
The STM is powered by 120 or 240 Vac (50 or 60 Hz) power which is supplied through a threeconductor AC power cord. The power cord is provided with the RU cabinet. One end of the cord
is hard-wired to the AC power outlet box and the other end is terminated with a molded-on plug
cap. The power cord connects to a 3-wire AC cord connector mounted on the STM 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 connecting
the wiring harness for the back-up battery system.
4.9 Cooling
Continuous air-flow for cooling is provided by a single fan mounted on the rear side of the STM
housing. An alarm is provided that indicates if a high temperature condition (>50º C/122º F)
occurs. If the temperature falls below 32º F (0º C), the fan automatically shuts off. The fan may
be field replaced if it fails.
4.10 User Interface
The STM user interface consists of the various connectors, switches, and LEDs that are
provided on the STM front panel. The STM user interface points are indicated in Figure 2-6 and
described in Table 2-3.
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© 2002, ADC Telecommunications, Inc.
(1) PORT 1
CONNECTOR
(2) PORT 2
CONNECTOR
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
(3) PORT 3
CONNECTOR
(4) ON/OFF
SWITCH
(5) AC POWER
CONNECTOR
(6) DC POWER
CONNECTOR
(17) DIVERSITY
ANTENNA
CONNECTOR
NOTE: UNIT SHOWN INCLUDES
DIVERSITY OPTION
Figure 2-6. Spectrum Transport Module User Interface
Table 2-3. Spectrum Transport Module User Interface
(7) SERVICE
CONNECTOR
(8-15) LED
INDICATORS
(16) ALARM
CONNECTOR
(18) ANTENNA
CONNECTOR
17527-A
REF
NO
1PORT 1SC
USER INTERFACE
DESIGNATION
DEVICE
connector
(single-mode)
2PORT 2SC
connector
(single-mode)
3PORT 3
(diversity unit only)
41/0 On/Off rocker
SC connector
(single-mode)
switch
5No designation 3-wire AC power
cord connector
6No designation 2- wire DC power
cord connector
7 SERVICE DB-9 connector
(female)
FUNCTIONAL
DESCRIPTION
Connection point for the forward path optical
fiber.
Connection point for the reverse path primary
optical fiber.
Connection point for the reverse path diversity
optical fiber.
Provides AC power on/off control.
Connection point for the AC power cord.
Connection point for the back-up battery power
cord.
Connection point for the RS-232 service interface cable.
© 2002, ADC Telecommunications, Inc.
Page 2-15
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
Table 2-3. Spectrum Transport Module User Interface, continued
REF
NO
USER INTERFACE
DESIGNATION
DEVICE
8AC POWER Multi-colored LED
(green/red)
9 STANDBY Multi-colored LED
(green/yellow/red)
10 HOST UNIT Multi-colored LED
(green/yellow/red)
11 STM Multi-colored LED
(green/yellow/red)
12 PA Multi-colored LED
(green/yellow/red)
13 VSWR Multi-colored LED
(green/yellow/red)
14 PORT 1/PORT 2 Multi-colored LED
(green/yellow/red)
FUNCTIONAL
DESCRIPTION
Indicates if the STM is powered by the AC power
source (green) or the back-up battery system
(red). See Note.
Indicates if the system is in the Normal state (off)
Standby state (blinking green), Test state (blinking red), or Program Load state (blinking yellow). See Note.
Indicates if no alarms (green), a minor alarm
(yellow), or a major alarm (red) is detected at the
HU. See Note.
Indicates if the STM is normal (green) or faulty
(red). See Note.
Indicates if the power amplifier is normal
(green), over temperature (yellow), has a fan failure (yellow), or is faulty (red). See Note.
Indicates if the forward path VSWR is above
(red) or below (green) the fault threshold.
Indicates if the forward path optical signal
received from the HU is normal (green), if no signal is detected (red), or if errors are detected
(red). See Note.
15 PORT 3
(diversity unit only)
16 ALARM IN MINOR
ALARM IN MAJOR
17 DIVERSITY
(diversity unit only)
18 ANTENNA N-type female RF
Note: A more detailed description of LED operation is provided in Section 5.
5 LINEAR POWER AMPLIFIER
The Linear Power Amplifier (LPA), shown in Figure 2-7, works is conjunction with the STM to
amplify the forward path RF output signal. The STM is interfaced with the LPA through the Dsub connectors and wiring harness located at the rear of the RU cabinet. The RF signal is passed
to the LPA for amplification and then passed back to the STM for output via the STM’s
ANTENNA port. The STM also supplies DC power to the LPA through the same interface.
Multi-colored LED
(green/yellow)
Screw-type terminal
connector (14–26
AWG)
N-type female RF
coaxial connector
coaxial connector
Indicates if the diversity reverse path optical signal received by the HU is normal (green), if no
signal is detected (yellow), or if errors are
detected (yellow). See Note.
Connection point for two external alarm inputs.
The door-open switch lead wires are typically
connected to the major alarm terminals.
Connection point for the diversity antenna.
Connection point for the primary antenna.
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© 2002, ADC Telecommunications, Inc.
LPA 1940
ADCP-75-126 • Issue B • April 2002 • Section 2: Description
5.1 Primary Components
The LPA consists of several electronic circuit board assemblies and two fan assemblies that are
mounted within a powder-coated sheet metal enclosure. The metal enclosure provides a
mounting point for the electronic components and controls RF emissions. Except for the fan
units, the electronic components are not user replaceable. The LPA is designed for use within
the RU cabinet. Except for the STM interface connector, all controls, indicators, and switches
are mounted on the LPA front panel for easy access. A carrying handle is provided on the front
of the LPA to facilitate installation and transport.
5.2 Mounting
17546-A
Figure 2-7. Linear Power Amplifier
The LPA mounts on a shelf within the RU cabinet. Runners on the top and bottom of the LPA
mesh with tracks on the mounting shelf. The runners and tracks guide the LPA into the installed
position. The electrical interface between the STM and LPA is supported by a D-sub female
connector located on the rear side of the LPA. A corresponding D-sub male connector mounted
at the rear of the RU cabinet mounting shelf mates with the LPA connector. Captive screws are
provided for securing the LPA to the mounting shelf.
Page 2-17
© 2002, ADC Telecommunications, Inc.
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