Avaya S8700 Series, Maintenance Manual

Page: 2398 / 2618

Maintenance-Object Repair Procedures
555-233-143 8-1676 Issue 1 May 2002
3. If the t/c selector has not undergone an interchange since the error
occurred, go to the next step. If such an interchange has taken
place, interchange back to the formerly active t/c selector. Use the
set expansion-interface command when investigating an EPN
Tone-Clock.) If the interchange attempt fails due to other errors,
resolve those problems first.
4. Interchange the IPSI or Tone-Clock circuits, using the set
tone-clock PC command. If the command succeeds, the
interchange which previously failed has been accomplished and the
problem has been satisfactorily resolved. If it fails, proceed to the
next step. (You may want to proceed in any case to definitively test
all relevant components.)
5. Interchange the t/c selector using set expansion-interface if
investigating an EPN. If errors prevent this interchange, resolve
them first.
6. Attempt again to interchange Tone-Clocks with the set tone-clock
PC command.
If the Tone-Clock interchange failed for both t/c selectors, replace
the standby Tone-Clock circuit pack which could not be
interchanged into and return to this step. (See
‘‘Replacing the IPSI
or Tone-Clock Circuit Pack’’ .) Test the new circuit pack as follows:
a. Execute the set tone-clock PC command.
b. Execute set expansion-interface, if this is an EPN
Tone-Clock.
c. Execute the set tone-clock PC command again.
If these commands successfully complete, the problem has
been resolved.
— If these commands successfully complete, the
problem has been resolved.
— If the IPSI or Tone-Clock circuit packs successfully
interchange when one EXP-INTF is active, but not
when the other one is:
The t/c-selector circuit pack on the failing side is
suspect.
d. Replace the EXP-INTF board that is active when the
Tone-Clock interchange fails. (For the Expansion Interface,
see
‘‘EXP-INTF (Expansion Interface Circuit Pack)’’ on page
8-762 .
e. Make sure the new t/c selector is active and execute the set
tone-clock PC command.
— If both Tone-Clocks can be interchanged into, and
interchanges succeed when either t/c selector is
active, the problem has been resolved.