Avaya Definity SI Maintenance Manual page 1600

Maintenance Object Repair Procedures
This action is destructive because it must temporarily disable all connections
between PPN and EPN. This break in the connections is not detectable by normal
voice users.
!
CAUTION:
Data connections lose a small amount of data. Depending on the data
transmission speed, the lost data is anywhere from zero to several bytes.
It is recommended that system technician switch links when it is necessary to run
the more destructive tests on Expansion Interface circuit packs. Most significantly,
Test #242 requires the Expansion Interface circuit pack to be busied out and,
therefore, the link with the Expansion Interface to be tested should be made the
Standby link.
To prevent the system from automatically switching Expansion Interface Links
during system technician-demanded tests, busyout one or both of the Standby
Expansion Interface circuit packs.
!
CAUTION:
This introduces a small risk. If the remaining Active Expansion Link should
fail while the Standby Expansion Link is busied out, service to the EPN is
lost.
The set expansion-link command has no error codes to return. It displays one of
following messages upon completion:
1. Command completed successfully
Link switch was successful. This may be verified by visually inspecting the
new yellow LED states or by the status system command.
2. Command did not complete successfully
This indicates that the system attempted to switch links, but for unknown
reasons the software or hardware was unable to complete the action. The
system may have switched and determined that the new link could not
provide service and thus returned to the original link.
3. Standby EXP-INTF Link is unable to take over
Because the Expansion Interface circuit pack pair on the Standby link has
enough errors logged against it as to be unable to provide service, the
system did not attempt to switch links.
4. EXP-INTF is already on active link
The Expansion Interface circuit pack address given in the set
expansion-link command is an Active Expansion Interface. The address
must be a Standby Expansion Interface circuit pack in order to switch links.
5. Address is not a valid Expansion Interface Board
The link switch could not be attempted because the address in the set
expansion-link command did not correspond to any known Expansion
Interface circuit pack.
10-814 Issue 4 May 2002 555-233-123