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ADCP-75-150 • Preliminary Issue A • March 2003 • Section 3: Host Unit Installation

Page 3-15

©

2003,

ADC

Telecommunications,

Inc.

10 EXTERNAL ALARM SYSTEM CONNECTIONS

The

alarm

interface

between

the

HU

and

an

external

alarm

system

is

supported

by

a

six-terminal

plug

(with

screw-type

terminals)

that

connects

to

a

receptacle

mounted

on

the

HU

front

panel.

The

terminal

plug

provides

connections

to

normally

open

(NO)

and

normally

closed

(NC)

dry

type

alarm

contacts

for

both

major

and

minor

alarms.

A

category

3

or

5

cable

is

typically

used

to

connect

the

HU

to

the

external

alarm

system.

Use

the

following

procedure

to

install

the

alarm

wiring

and

connect

it

to

the

HU:

1. Obtain

the

required

length

of

category

3

or

5

cable.

2. Route

the

cable

between

the

HU

and

the

external

alarm

system

(if

not

already

routed)

and

then

cut

to

the

required

length.

Allow

sufficient

slack

for

dressing

and

organizing

the

cable

at

the

HU.

3. Strip

back

the

outer

cable

sheath

and

insulation

to

expose

the

wires

at

both

ends

of

the

cable

and

strip

back

0.2

inches

(5

mm)

of

insulation

from

each

wire.

4. Connect

the

Major

alarm

wire

pair

to

the

MAJOR

COM/NC

or

MAJOR

COM/NO

terminals

(whichever

is

required

by

the

external

alarm

system)

on

the

HU

alarm

terminal

connector

(supplied

with

HU)

as

shown

in

Figure 3-14.

Figure 3-14. External Alarm System Connections

5. Connect

the

Minor

alarm

wire

pair

to

the

MINOR

COM/NC

or

MINOR

COM/NO

terminals

(whichever

is

required

by

the

external

alarm

system)

on

the

HU

alarm

terminal

connector

(see

Figure 3-14).

18660-A

ALARM

CONNECTOR

MAJOR ALARM WIRES

MINOR ALARM WIRES

ALARM CONNECTOR

DETAIL

NO

COM

NC

NO

COM

NC