User Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivance 800 MHz Indoor Coverage Solution

ADCP-75-110 • Issue B • March 2001

Page 8

©

2001,

ADC

Telecommunications,

Inc.

1.3.3 Fault Detection

The

DRU

is

designed

to

detect

internal

circuitry

faults

or

loss

of

system

inputs.

A

front

panel

LED

indicator

turns

from

green

to

red

when

a

fault

condition

is

detected

or

when

the

system

optical

input

is

lost.

The

DRU

sends

the

fault

information

to

the

DHU

over

the

fiber

optic

link.

A

corresponding

port

LED

at

the

DHU

turns

red

when

the

DRU

reports

a

fault.

1.3.4 RF Signal Interface

The

RF

signal

interface

between

the

DRU

and

the

cellular

users

is

provided

through

an

external

antenna

connected

to

a

female

SMA

connector.

The

antenna

which

must

be

ordered

separately.

Several

types

of

antennas

with

various

patterns

are

available.

Non-ADC

antennas

may

also

be

used

with

the

DRU

to

meet

various

application

requirements.

1.3.5 Optical Port

The

DRU

is

equipped

with

a

duplex

LC

type

optical

adapter

that

provides

a

point

for

connecting

the

optical

link

cables.

Depending

on

the

application

requirements,

the

optical

adapter

may

be

connected

to

either

a

DHU

or

a

DEU.

1.3.6 Powering

The

DRU

is

equipped

with

a

female

RJ-45

jack

that

provides

a

point

for

connecting

a

DC

power

cable.

The

DRU

is

powered

by

nominal

48

VDC

power

which

is

supplied

through

the

RJ-45

connector.

Power

to

the

DRU

may

be

supplied

by

the

DHU,

DEU,

or

by

a

120

VAC

to

48

VDC

power

converter

(available

separately

as

an

accessory

item)

plugged

into

a

properly

grounded

120

VAC

outlet.

The

AC/DC

converter

is

a

UL

Listed

stand

alone

Limited

Power

Supply

(LPS)

unit

with

a

rated

output

of

48

VDC

at

1.2

A.

When

powered

by

the

DHU

or

DEU,

a

category

5

twisted-pair

cable

terminated

with

RJ-45

connectors

is

required.

1.3.7 Cooling

The

DRU

is

cooled

by

natural

convection

air

flow.

The

DRU

mounting

feet

are

designed

to

provide

clearance

under

the

unit

so

that

air

can

enter

the

DRU

enclosure

from

the

bottom

and

exit

through

the

top.

A

minimum

clearance

of

3

inches

(76

mm)

must

be

provided

on

all

sides

of

the

DRU

(except

the

bottom)

to

ensure

there

is

adequate

air

circulation

for

cooling.

In

addition,

at

least

one

surface

of

the

DRU

installation

area

must

be

open

to

the

interior

of

the

building.

1.3.8 User Interface

The

DRU

user

interface

consists

of

the

connectors

and

the

LED

that

are

provided

on

the

DRU

front

and

rear

panels.

The

DRU

user

interface

points

are

indicated

in

Figure

5

and

described

in

Table

2.