User Manual

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ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance

Page 5-11

©

2002,

ADC

Telecommunications,

Inc.

4 TEST PROCEDURES

This

section

provides

procedures

for

common

troubleshooting

and

maintenance

tests.

Refer

to

these

procedures

as

needed

when

specified

in

the

Fault

Isolation

and

Troubleshooting

tables

in

Section

3.

4.1 Optical Power Test

A

break

in

an

optical

fiber

or

a

fault

with

the

optical

connector

will

interrupt

communications

between

linked

components

or

generate

excessive

errors.

Use

the

following

procedure

to

isolate

a

problem

with

an

optical

fiber

or

connector.

1. Put

on

the

IR

filtering

safety

glasses.

2. Notify

the

NOC

or

alarm

monitoring

system

operator

that

the

system

is

going

offline.

3. At

the

HU

and

at

the

STM,

place

the

On/Off

switch

in

the

OFF

position

(press

O).

4. Disconnect

the

optical

fiber

connectors

for

the

fiber

to

be

tested

at

the

HU

and

at

the

STM.

5. Inspect

the

optical

connectors.

Verify

that

each

connector

is

clean

and

that

no

scratches

or

imperfections

are

visible

on

the

fiber

end.

Clean

and

polish

the

optical

connector

if

necessary.

6. Connect

a

laser

light

source

to

one

end

of

the

optical

fiber

and

an

optical

power

meter

to

the

other

end.

Alarm Type LED Color

Major SHUTDOWN Red

PROBLEM: The RF output from the LPA is shutdown.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1.The

RF

ON/OFF

switch

is

in

the

OFF

position

or

the

LPA

was

set

in

the

disable

mode

through

the

EMS

computer.

2.

Breaker

switch

on

LPA

is

open

3.

The

LPA

is

faulty.

1.Place

RF

ON/OFF

switch

in

the

ON

position

or

enable

the

LPA.

2.

Reset

breaker

switch.

3.

Replace

LPA.

Danger:

This

equipment

uses

a

Class

1

Laser

according

to

FDA/CDRH

rules.

Laser

radiation

can

seriously

damage

the

retina

of

the

eye.

Do

not

look

into

the

ends

of

any

optical

fiber.

Do

not

look

directly

into

the

optical

transmitter

of

any

unit

or

exposure

to

laser

radiation

may

result.

An

optical

power

meter

should

be

used

to

verify

active

fibers.

A

protective

cap

or

hood

MUST

be

immediately

placed

over

any

radiating

transmitter

or

optical

fiber

connector

to

avoid

the

potential

of

dangerous

amounts

of

radiation

exposure.

This

practice

also

prevents

dirt

particles

from

entering

the

connector.

Table 5-8. STM and LPA Fault Isolation and Troubleshooting, continued