User Manual

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Table Of Contents

ADCP-75-124 • Issue B • April 2002 • Section 1: Overview

Page 1-4

©

2002,

ADC

Telecommunications,

Inc.

3 SYSTEM FUNCTIONS AND FEATURES

This

section

describes

various

system

level

functions

and

features

of

the

Digivance

LRCS.

3.1 Fiber Optic Transport

On

an

optional

basis,

the

Digivance

LRCS

is

available

either

with

or

without

reverse

path

diversity.

On

non-diversity

systems

that

do

not

use

a

WDM

module,

the

HU

is

connected

to

the

RU

over

a

pair

of

single-mode

optical

fibers.

One

fiber

is

used

to

transport

the

forward

path

optical

signal.

The

other

fiber

is

used

to

transport

the

reverse

path

optical

signal.

Because

the

optical

signal

is

digital,

the

input

and

output

RF

signal

levels

at

the

HU

or

the

RU

are

not

dependent

on

the

level

of

the

optical

signal

or

the

length

of

the

optical

fiber.

A

diagram

of

the

fiber

optic

transport

system

for

a

non-diversity

system

that

does

not

include

the

WDM

module

is

shown

in

Figure 1-2.

Figure 1-2. Fiber Optic Transport without Diversity and Without WDM Module

On

diversity

systems

that

do

not

use

a

WDM

module,

the

HU

is

connected

to

the

RU

over

three

single-mode

optical

fibers.

One

of

the

optical

fibers

is

used

to

transport

the

forward

path

optical

signal.

A

second

fiber

is

used

to

transport

the

primary

reverse

path

optical

signal.

The

third

fiber

is

used

to

transport

the

diversity

reverse

path

optical

signal.

A

diagram

of

the

fiber

optic

transport

system

with

the

diversity

option

is

shown

in

Figure 1-3.

The

maximum

length

of

the

optical

fibers

is

dependent

on

the

loss

specifications

of

the

optical

fiber

and

the

losses

imposed

by

the

various

connectors

and

splices.

The

system

provides

an

optical

budget

of

25

dB

(typical)

when

used

with

9/125

single-mode

fiber.

BTS

HOST UNIT

REMOTE UNIT

16996-A

FORWARD PATH

REVERSE PATH

COAX

FIBER OPTIC

LINK

EBTS

HOST UNIT

REMOTE UNIT

16996-A

FORWARD PATH

REVERSE PATH

COAX

FIBER OPTIC

LINK