User Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivance 800 MHz 20 Watts System

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

Page 2-3

©

2003,

ADC

Telecommunications,

Inc.

1 INTRODUCTION

This

section

describes

the

basic

components

of

the

Digivance

800

MHz

20

Watt

system

including

the

Host

Unit

(HU),

the

Remote

Unit

(RU),

and

the

Digivance

Element

Management

System

(DEMS).

The

RU

is

an

assembly

that

consists

of

a

cabinet

(for

outdoor

applications)

or

mounting

shelf

(for

indoor

applications),

a

Spectrum

Transport

Module

(STM),

and

a

Linear

Power

Amplifier

(LPA)

module.

For

clarity,

the

various

components

that

comprise

the

RU

are

described

separately.

2 HOST UNIT

The

HU,

shown

in

Figure 2-1,

serves

as

the

BTS

servicing

unit

for

the

Digivance

system.

The

HU

provides

the

following

basic

functions:

• Provides

an

adjustable

RF

interface

with

the

BTS.

• Provides

a

fiber

optic

interface

with

the

RU.

• Digitizes

the

forward

path

composite

RF

signal.

•Converts

the

digitized

forward

path

RF

signal

to

a

digital

optical

signal.

•Converts

the

digitized

reverse

path

optical

signal

to

a

digitized

RF

signal.

•Converts

the

digitized

reverse

path

RF

signal

to

a

composite

RF

signal.

• Signals

alarm

information

to

an

external

alarm

system

through

relay

contact

closures

• Provides

an

RS-232

interface

for

connecting

the

DEMS

computer.

• Provides

a

CAN

interface

for

networking

multiple

HUs.

2.1 Primary Components

The

HU

consists

of

an

electronic

circuit

board

assembly

and

a

fan

assembly

that

are

mounted

within

a

powder-paint

coated

sheet

metal

enclosure.

The

enclosure

provides

a

mounting

point

for

the

circuit

board

and

fan

assemblies

and

controls

RF

emissions.

The

only

user-replaceable

component

is

the

fan

assembly.

The

HU

is

designed

for

use

within

a

non-condensing

indoor

environment

such

as

inside

a

wiring

closet

or

cabinet.

All

controls,

connectors,

and

indicators

(except

the

power

terminal

strip)

are

mounted

on

the

HU

front

panel

for

convenient

access.

Cable

management

functions

for

the

coaxial

cables

and

copper

wiring

are

provided

by

a

cable

management

tray

that

extends

outward

from

the

HU

front

panel.

2.2 Mounting

The

HU

is

intended

for

rack-mount

applications.

A

pair

of

reversible

mounting

brackets

is

provided

that

allow

the

HU

to

be

mounted

in

either

a

19-inch

or

23-inch

EIA

or

WECO

equipment

rack.

When

installed,

the

front

panel

of

the

HU

is

flush

with

the

front

of

the

rack.

The

cable

management

tray

extends

3.9

inches

(99

mm)

beyond

the

front

panel.

Fasteners

are

provided

for

securing

the

HU

to

the

equipment

rack.