Avaya Definity SI Maintenance Manual page 1233

CO-TRK (CO Trunk)
Table 10-165. TEST #0 Dial Tone Test — Continued
Error
Code
555-233-123
Test
Result
FAIL Trunk was seized, but dial tone could not be detected.
1. Test all administered outgoing ports on the board. Failure
of 1 indicates a problem toward the CO.
2. If all fail, see note below.
3. Check for errors on the TONE-BD or TONE-PT. Clear any
errors found, and repeat the test.
4. If the error has still not cleared, refer the problem to the
CO.
5. If no service problems exist on the port, continue to use
the port until the circuit pack can be replaced (as a last
resort). Perform a trunk test call to see if the trunk is
operable.
NOTE:
If the dial tone test fails for all ports on a circuit pack, a
-5 volt power problem is indicated. If a TN736 or TN752
power unit circuit pack is present, either the 631DB AC
power unit or the 676B DC power unit may be defective.
(The 631DB power unit is used in a medium cabinet
powered by an AC source. The 645B power unit is used
in a medium cabinet powered by a DC power source.)
The system may contain a TN736 or TN752 power unit
circuit pack or a 631DB AC power unit, but not both
types of power units. To investigate problems with a
631DB AC power unit, refer to the CARR-POW (carrier
port power unit for AC-powered systems) Maintenance
documentation. To investigate problems with a 645B DC
power unit, refer to the CARR-POW (carrier port power
unit for DC-powered systems) Maintenance
documentation.
Description/Recommendation
Continued on next page
Issue 4 May 2002 10-447