User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 2: Description

Page 2-9

3.2 Mounting

The STM mounts within the RU outdoor cabinet or indoor mounting shelf. Runners on the top

and bottom of the STM mesh with tracks in the cabinet or mounting shelf. The runners and

tracks 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 or indoor mounting

shelf mates with the STM connector. Captive screws are provided for securing the STM in the

installed position.

Figure 2-3. Typical Spectrum Transport Module

3.3 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 (cabinet 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 interface to the HU and also over the service

interface. In addition, the alarm state of the HU is received over the optical interface and

reported to the service interface. Fault and alarm information may be accessed locally through

the EMS software GUI or remotely through the NOC/NEM interface or SNMP interface.

20023-B