User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-339CO-TRK (CO Trunk)
10
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.
Table 10-94. TEST #0 Dial Tone Test — Continued
Error
Code
Test
Result Description/ Recommendation
Continued on next page