User Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivance 800 MHz 20 Watts System

1

2

3

4

5

6

7

8

9

ADCP-75-150 • Preliminary Issue A • March 2003 • Section 2: Description

Page 2-20

©

2003,

ADC

Telecommunications,

Inc.

Figure 2-9. Linear Power Amplifier

6.2 Mounting

The

LPA

mounts

within

the

RU

outdoor

cabinet

or

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

cabinet/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

DEMS

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

cabinet/

mounting

shelf.

18640-A

STATUS

MUTE

NORM

RESET