User's Manual

ADCP-75-158 • Issue 1 • July 2003 • Section 2: Description

Page 2-20

Figure 2-9. Linear Power Amplifier

6.2 Mounting

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

top and bottom of the LPA mesh with tracks. 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 outdoor cabinet or RU indoor mounting shelf mates with the LPA

connector. Captive screws are provided for securing the LPA in the installed position.

6.3 Fault Detection and Alarm Reporting

The LPA in conjunction with the STM detects and reports various faults including power

amplifier fault, output power fault, temperature fault, and fan fault. A single Light Emitting

Diode (LED) indicator, located on the front panel of the LPA, turns from green to red or yellow

if an LPA fault is detected. The status of the LPA, the alarm state (major or minor), and other

information is summarized and reported (by the STM) over the

optical fiber to the HU and also

to the service interface. This information may be accessed remotely through the NOC/NEM

interface or locally through the EMS software GUI.

6.4 Powering

The LPA is powered by various DC voltages which are supplied by the STM over the electrical

interface provided by the D-sub connectors and wiring harness mounted within the RU outdoor

cabinet or RU indoor mounting shelf.

18796-A

1900 MHz 20 WATT