Nortel DMS-100 Series Maintenance Manual page 390

9-26 Trouble isolation and correction
6 Replace the line card for failure messages.
Several error messages that apply to diagnostics appear on the following
table:
Diagnostic error messages and failed tests
Failed test
Negative tip party ringing
Positive tip party ringing
Positive ring party ringing
Positive coin control voltage
Positive coin control ground
Negative coin control voltage
Negative coin control ground
Tests for the
297-8231-550 Standard 09.01 August 1998
command can fail for the following reasons:
>DIAG
off-hook
on-hook
tip ringing
Automatic number identification (ANI) ground
positive ring party
positive tip party
idle channel noise
echo return loss
carrier channel loss
coin collect
positive coin off-hook
positive coin presence
negative coin presence
coin return
negative coin off-hook
talk battery.
Error message
Tip ringing, ANI ground
Positive tip party
Positive ring party
Coin collect or positive coin off-hook
Positive coin presence
Coin return or negative coin off-hook
Negative coin presence