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ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Page 2-15
© 2003, ADC Telecommunications, Inc.
5 SPECTRUM TRANSPORT MODULE
The Spectrum Transport Module (STM), shown in Figure 2-7, provides the following basic
functions:
• Provides an RF interface (antenna port) to the remote antenna.
• 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 to the HU via the optical link.
• Provides an AC power interface.
• Provides an external alarm interface.
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 also 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.
Table 2-3. Remote Unit Outdoor Mounting Shelf User Interface
REF
NO
DEVICE FUNCTIONAL DESCRIPTION
1 STM mounting slot Provides a mounting point for the STM module.
2 LPA mounting slot Provides a mounting point for the LPA module.
3 Grounding lug Provides a connection point for an external grounding cable.
4 AC power cable Provides AC power to the STM.
5 WDM mounting slot Provides a mounting point for the WDM module.
6 CWDM mounting slot Provides a mounting point for the CWDM module.
7 CWDM power cord Provides DC power to the CWDM module.