Section 363-704-102-02
January 12, 1998
Revision 02
Page 8
PairGain Engineering - Plant Series
PG-Flex FLC-704 List 2
Table 3. FLC-704 Channel Unit Troubleshooting
Indication
Problem
Action
FAULT LED
ON
The FLC-704 processor has
detected a fault.
Remove and re-insert the Channel Unit. If the FAULT LED does not
extinguish, replace the Channel Unit.
Troubleshooting based on customer-originated trouble reports
No Dial tone,
Can’t Dial
•
faulty RT or COT
Channel Unit
•
facility short/open
•
CO switch problem
1
Lift the subscriber pair at the network interface. If dial tone is present
and you can place a call, refer the problem to the customer per local
practice.
2
If you cannot hear dial tone or cannot place a call at the network
interface (with the subscriber pair lifted), check for dial tone at the RT.
If dial tone is present, check the pair between the RT and the network
interface. If no dial tone is present, replace the RT Channel Unit.
3
If the problem still exists, re-insert the original RT Channel Unit and
replace the COT Channel Unit. Test for operation.
4
If the problem still exists, refer the problem to the CO switch.
Phone Doesn’t
Ring
•
high-resistance
subscriber line short
•
faulty RT or CO
Channel Unit
•
loop length too long
1
Lift the subscriber pair at the network interface. If ringing is present,
refer the problem to the customer per local practice.
2
If ringing is not present, check for ringing at the RT. If ringing is
present, check the pair between the RT and the network interface. If no
ringing is present, replace the RT Channel Unit. If ringing is still not
present, check a circuit on another Channel Unit. If ringing is still not
present, replace the Line Unit.
3
If ringing is still not present at the RT, re-insert the original Channel
Unit and Line Unit. Test for ringing at the COT.
4
Test for ringing into the COT from the CO switch. If no ringing is
present, refer the trouble to the CO switch. If ringing is present, replace
the COT Channel Unit. Test again for ringing at the network interface.
If ringing is still not present, contact PairGain technical assistance per
section 9.
5
Verify the resistance of the copper loop between the RT Enclosure and
the network interface is less than 530
Ω
.
Phone doesn’t
stop ringing
•
faulty subscriber
instrument
•
faulty RT Channel Unit
•
loop length too long
1
Test for ring trip at the network interface. If the ringing is tripped, refer
the trouble to the customer per local practice.
2
If the ringing is not tripped, test for tripping at the RT. If ring trip does
occur, check the loop for excessive length. If ring trip does not occur,
replace the RT Channel Unit. If ring trip still does not occur, contact
PairGain technical assistance per section 9.
3
Verify the resistance of the copper loop between the RT Enclosure and
the network interface is less than 530
Ω
.
Can’t Hear,
Can’t Be
Heard
•
subscriber problem
•
faulty RT or COT
Channel Unit
1
Lift the subscriber line at the network interface and check the signal
level. If correct, refer trouble to the customer per local practice.
2
If the level is too low, check the level at the RT. If the level is correct
at the RT, check the pair between the RT and the network interface. If
the level is too low at the RT, replace the RT Channel Unit.
3
If the level is still too low, re-insert the original RT Channel Unit.
4
Check the level at the COT coming from the CO switch. If it is correct,
replace the COT Channel Unit. If it is not correct, refer the problem to
the CO regarding the switch.
5
If the level is still not correct, re-insert the original COT Channel Unit.
Contact PairGain technical assistance per section 9.
Summary of Contents for PG-Flex 8 FLC-704
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