Nortel DMS-100 Series Reference Manual page 473

The following table lists critical dynamic data that transfer to the inactive
unit. The active unit sends the critical dynamic data to the mate. The active
unit first sends the data in bulk form. The active unit begins to send the data
continuously as the data in the active unit change.
Critical dynamic data
Dynamic data
Call data
Terminal status
Port status
PCM30 maintenance
P-side node status
Protection switching
Nailed-up connections
The inactive unit can use dynamic data to seize call processing from the
mate and retain established calls.
DMS-100 Family XPM International Translations Reference Manual XPM12 and up
Introduction to Remote Switching Center Multi-access 5-13
Condition for change
The system establishes or
disconnects call
Terminal (line or trunk) is put in
service or set to OOS.
A request for a P- or C-side port
change in state (open or close)
occurs.
The system enables or disables
maintenance or data synchronization
that reports over PCM30 links.
The P-side node (AN) is BSY or RTS.
The system enables, disables,
switches or unswitches protection
switching.
The system establishes or takes down
P-side to P-side nailed-up connection
for special services.