DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-15Executing a Planned SPE Interchange
5
Executing a Planned SPE Interchange
Planne d SPE int erch ange s are i nitia ted o n dem and by th e reset system
interchange command, or automatically b y scheduled daily maintenance. The
latter is administered with the system-p arameters maintenance screen. A
planned interchang e normally has no perceivabl e effect on service. All active
calls, transient calls, system links and stimuli, and data transmissio n are
pres erved . The SYSA M-RMT p ort ( also c all ed th e Remot e Acc ess Port) i s
dropped, nec essitating a re-login. The duration of the interchange is
approximately one minute.
!CAUTION:

Switc hing the SPE-s elec t swi tche s to t he sta ndb y ca rrier caus es a

spontaneous interchange, not a planned one. This can disr upt service and

is not a recommended p rocedure.

Prerequisites

Several conditions must be met to g uarantee a non-disruptive interc hange. If
these are not met the system will not execute the interc hange. All of these
conditions, listed below, are expected to be met during normal operation.
■The SPE mus t not b e loc ked by t he SPE-SELEC T switc hes .
■The standby SPE must be fully in service.
That is, handshake is up, shadowing is on, memory is refreshed, and
standby SPE state-of-health is “functional”. ‘‘STBY-SPE (Standby S PE
Maintenance)’’ describes how to correct a failure of any of these.
■There c an b e no m inor a larm s aga inst t he st andb y’s PK T-INT o r SYSAM
circuit packs.
■There can be no ongoing d isk or tape operations on either ac tive or
standby MSS components.
Wait until all such operations, such as trans lation saves or backup
restores, are complete before requesti ng an interchange.

SPE Interchange Failures

If the above conditions are not me t, or if any intermediate steps taken b y the
system in executing the interch ange fail, the interchange is p revented. Usually,
failure of a planned interchang e has no effect on service.
If the interchange fails after the p acket interface links have mig rated, the system
will require a reset level 1 (warm restart) to restore the links. In s uch a case, no
calls are dropped , and new call servic e resumes within 5 seconds. Howe ver, it is
probable that there is a severe system p roblem which pred ates the attempted
interchange.