User Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivanceÂ® Long Range Coverage Solution 1900 MHz

1

2

3

4

5

6

7

8

9

Table Of Contents

SECTION 3: Host Unit Installation

ADCP-75-126 • Issue B • April 2002 • Section 2: Description

Page 2-13

©

2002,

ADC

Telecommunications,

Inc.

4.1 Primary Components

The

STM

consists

of

an

electronic

circuit

board

assembly,

power

supply,

duplexer,

and

fan

assembly

that

are

mounted

within

a

powder-coated

sheet

metal

enclosure.

The

metal

enclosure

provides

a

mounting

point

for

the

electronic

components

and

controls

RF

emissions.

Except

for

the

fan

unit,

the

electronic

components

are

not

user

replaceable.

The

STM

is

designed

for

use

within

the

RU

cabinet.

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.

4.2 Mounting

The

STM

mounts

on

a

shelf

within

the

RU

cabinet.

A

runner

on

the

bottom

of

the

STM

meshes

with

a

track

on

the

mounting

shelf.

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

mounting

shelf

mates

with

the

STM

connector.

Captive

screws

are

provided

for

securing

the

STM

to

the

mounting

shelf.

4.3 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

fiber

to

the

HU

and

also

over

the

service

interface.

In

addition,

the

alarm

state

of

the

HU

is

received

over

the

optical

fiber

and

reported

to

the

service

interface.

This

information

may

be

accessed

remotely

through

the

NOC/NEM

interface

or

locally

through

the

EMS

software

GUI.

4.4 Antenna Cable Connection

The

antenna

cable

connections

between

the

STM

and

the

antenna

are

supported

through

either

one

(non-diversity

unit)

or

two

(diversity

unit)

N-type

female

connectors.

On

non-diversity

units,

a

single

connector

is

used

for

the

antenna

cable

which

carries

both

the

forward

and

primary

reverse

path

RF

signals.

On

diversity

units,

a

second

connector

is

used

for

the

diversity

antenna

cable

which

carries

only

the

diversity

reverse

path

RF

signals.

The

STM

does

not

connect

directly

to

the

antenna

but

instead

connects

to

a

lightning

protector

that

is

mounted

on

the

bottom

of

the

RU

cabinet

(see

Section

3.5).

A

coaxial

jumper

cable

is

provided

(included

with

the

enclosure)

for

connecting

the

STM

connector

to

the

lightning

protector.

4.5 RF Signal Level Adjustment

The

STM

is

equipped

with

a

digital

attenuator

for

adjusting

the

signal

level

of

the

forward

path

RF

output

signal.

The

remote

forward

path

attenuator

adjusts

the

level

of

the

output

RF

signal

at

the

RU

antenna

port

and

will

add

from

0

to

30

dB

of

attenuation

to

the

output

signal

level.