PairGain PG-Flex, Manual

Page: 118 / 168

Troubleshooting
110
Troubleshooting Using Standard Test Equipment
Table 34 describes basic troubleshooting methods using standard test equipment.
Table 34. Troubleshooting Using Standard Test Equipment
Indication Problem Action
No HDSL Loop Sync HDSL wire pair is impaired.
(too long, open, shorted, or grounded) See Table 35, “12/24 Channel HDSL
Transmission Distance,” on page 111
Use the local practices to test the wire pairs.
No power to the RT The tip and ring voltages are incorrect. Measure the voltage from T1 to frame ground
and from R1 to frame ground. This should be a
positive voltage up to +130 Vdc.
Measure the voltage from T2 to frame ground
and from R2 to frame ground. This should be a
negative voltage down to -130 Vdc.
The HDSL voltages are incorrect Measure the voltage from T1 to frame ground
and from R1 to frame ground. This should be a
positive voltage up to -130 Vdc.
Measure the voltage from T2 to frame ground
and from R2 to frame ground. This should be a
negative voltage down to +130 Vdc.
No dial tone Move or swap cards to isolate the defective unit.
No dial tone for all
systems Check for MAJOR alarm, this terminates dial
tone to the RT.
Check the alarm history.
If still no dial tone and no major alarms, verify
that the channels are not disabled. Refer to
“Channel Configuration.”
No ring on one channel Swap cards.
No ring on all channels Check for a major alarm on the FPI-729 or
FAU-728 front panels.
If yes, replace the channel unit.
If no, check for a dial tone.
Note: The ring generator is on the line unit, not
the channel unit.
“Popping” intermittent
dial tone (POTS only) Service disconnects or Major Alarms If using an FAU 728 List 2 or and FPI-729 List
1, verify that the composite clock is terminated.
(Refer to “Connect the Composite Clock” on
page 46.)