ADC DLC0802A Users Manual
FCC ID: F8I-DLC0802A User Manual - Part 2
Table 2-3. Remote Unit Outdoor Mounting Shelf User Interface
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description
REF
NO
1STM
2LPA
3 Grounding lug Provides a connection point for an external grounding cable.
4AC
5WDM
6CWDM
7CWDM
DEVICE FUNCTIONAL DESCRIPTION
mounting slot Provides a mounting point for the STM module.
mounting slot Provides a mounting point for the LPA module.
power cable Provides AC power to the STM.
mounting slot Provides a mounting point for the WDM module.
mounting slot Provides a mounting point for the CWDM module.
power cord Provides DC power to the CWDM module.
5 SPECTRUM TRANSPORT MODULE
The Spectrum Transport Module (STM), shown in Figure 2-7, 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 DEMS computer.
• Transports alarm, control, and monitoring information via the optical link.
• Provides AC power input.
• Provides external alarm input.
5.1 Primary Components
The STM consists of an electronic circuit board assembly, power supply, duplexer, and fan
assembly that are mounted within a powder-paint 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 outdoor cabinet or indoor mounting shelf. 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.
© 2003, ADC Telecommunications, Inc.
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ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description
18634-A
Figure 2-7. Spectrum Transport Module
5.2 Mounting
The STM mounts within the RU outdoor cabinet or indoor mounting shelf. A runner on the
bottom of the STM meshes with a track inside the cabinet/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 Dsub 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 in the installed position.
5.3 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
In addition, the alarm state of the HU is received over the
interface. This information may be accessed remotely through the NOC/NEM interface or
locally through the DEMS software GUI.
optical
fiber to the HU and also over the service interface.
optical
fiber and reported to the service
5.4 Antenna Cable Connection
The antenna cable connections between the STM and the antenna are supported through one Ntype female connector which carries both the forward and reverse path RF signals. When
installed in the RU outdoor cabinet, the STM does not connect directly to the antenna but
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© 2003, ADC Telecommunications, Inc.
instead connects to a lightning protector that is mounted on the bottom of the cabinet (see
Section 3.6). A coaxial jumper cable is provided (included with the enclosure) for connecting
the STM connector to the lightning protector.
5.5 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 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 NOC/NEM interface or the DEMS software GUI.
5.6 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 connecting the forward path optical signal and the
other port is used for connecting the primary reverse path optical signal.
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description
5.7 Service Interface Connection
The service interface connection between the STM and a local laptop computer loaded with the
DEMS 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.
5.8 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 outdoor cabinet or indoor
mounting shelf. The power cord connects to an AC connector mounted on the STM front panel.
A switch on the STM front panel provides AC power On/Off control.
5.9 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.
5.10 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 2-8 and
described in Table 2-4.
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© 2003, ADC Telecommunications, Inc.
ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description
(1) PORT 1
CONNECTOR
(2) PORT 2
CONNECTOR
(3) ON/OFF
SWITCH
(4) AC POWER
CONNECTOR
(5) DC POWER
CONNECTOR
(6) SERVICE
CONNECTOR
(7-13) LED
INDICATORS
(14) ALARM
CONNECTOR
Figure 2-8. Spectrum Transport Module User Interface
Table 2-4. Spectrum Transport Module User Interface
REF
NO
1PORT 1SC
USER INTERFACE
DESIGNATION
DEVICE
connector
(single-mode)
2PORT 2SC
connector
(single-mode)
3 I/0 On/Off rocker
switch
4No designation 3-wire AC power
cord connector
5No designation 2- wire DC power
cord connector
(15) ANTENNA
CONNECTOR
18636-A
FUNCTIONAL
DESCRIPTION
Input connection point for the forward path optical fiber.
Output connection point for the reverse path primary optical fiber.
Provides AC power on/off control.
Connection point for the AC power cord.
Connection point for a back-up battery power
cord. (Not used with 20 Watt system)
6 SERVICE DB-9 connector
7AC POWER Multi-colored LED
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© 2003, ADC Telecommunications, Inc.
(female)
(green/red)
Connection point for the RS-232 service interface cable.
Indicates if the STM is powered by the AC power
source (green) or the back-up battery system
(red). See Note.
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