CopperOptics PairGain PG-Flex FRC-753 매뉴얼 - 페이지 8

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Section 363-753-102

Revision 01

Indication

FAULT LED

The processor in the

RT Line Unit has

stopped.

No Dial tone,

Short circuit, faulty

Can't Dial

COT, or faulty RT

Channel Unit.

Phone

High-resistance short

Doesn't

on subscriber drop,

Ring

faulty RT Channel

Unit, or faulty RT

Line Unit.

Phone

Faulty subscriber

Doesn't

station instrument,

Stop

faulty RT Channel

Unit, or loop length

Ringing

too long.

Can't Hear,

Subscriber problem,

Can't Be

faulty COT Channel

Heard

Unit, or faulty RT

Channel Unit.

PairGain Technologies, Inc.

Page 8

TABLE 3. FRC-753 RT CHANNEL UNIT TROUBLESHOOTING

Problem

Remove and replace the RT Line Unit. If the system does not restart, replace the

RT Line Unit.

Troubleshooting based on customer-originated trouble reports

1. Lift the subscriber pair at the RT. If dial tone is present and calls can be placed,

check for shorts toward the subscriber or on the customer's premise.

2. If you cannot hear a dial tone and/or cannot make calls at the RT with the

subscriber drop lifted, lift the jumper in the CO between the CO switch and the

COT. If you hear a dial tone and/or can make calls at the switch, replace the

COT Channel Unit and/or RT Channel Unit. Otherwise, the problem is in the

CO switch.

1. Check for ringing at the RT. If ringing isn't present on the line under test, try

ringing another line terminated on the same RT Channel Unit. If ringing is

present on other lines, check for high resistance shorts on the subscriber drop.

2. If ringing isn't present on a circuit terminated on the same RT Channel Unit, try

ringing a line terminated on another RT Channel Unit. If the line rings, replace

the RT Channel Unit. If the line doesn't ring, replace the RT Line Unit.

1. Phone stops ringing when using a butt-in at subscriber location:

a) Subscriber's station instrument's internal resistance is too high. Replace

instrument according to local policies.

2. If phone doesn't stop ringing when using a butt-in at the subscriber location, re-

test at the RT:

a) If phone still doesn't stop ringing, replace the RT Channel Unit.

b) Otherwise, loop length between RT and subscriber is too long.

1. Lift the subscriber drop at the RT. If audible level is acceptable, there is a

problem toward the subscriber.

2. If audible level is too low at the RT with the subscriber drop lifted, lift the jumper

in the CO between the CO switch and the COT. If audible level is acceptable,

replace the COT Channel Unit and/or RT Channel Unit. Otherwise, the problem

is in the CO switch.

Action