User Manual

ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description

Page 2-16

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. 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 or RU 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

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. This information may be accessed remotely through the NOC/

NEM interface or locally through the EMS software GUI.

5.4 Antenna Cable Connection

The antenna cable connections between the STM and the antenna are supported through one N-

type 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

18634-B