Nortel DMS-100 Series Maintenance Manual page 50

1-34 Maintenance overview
The following limits apply to the Warm SWACT feature:
The following examples describe the abilities and limits of the enhanced
Warm SWACT feature:
297-8231-550 Standard 09.01 August 1998
The Warm SWACT feature maintains calls. If a subscriber line test is
active and a Warm SWACT occurs, the test fails.
Synchronization of call data between mates occurs when call processing
does not occur. Bandwidth limits on the IMC link between the two SMS
units and limited UP real time do not allow call processing. Under
heavy traffic, call data in the inactive unit is not always up-to-date. The
system can drop some established calls when a SWACT occurs.
An established calls that remains over an uncontrolled Warm SWACT
does not maintain the hook-flash capability to initiate flash-activated
subscriber features. Examples of flash-activated subscriber features are
call transfer, three-way calling, conference calls, call parking, and
executive busy override. This established call cannot initiate
flash-activated subscriber features for the rest of the call. Hook flashes
are ignored.
For example, subscriber A calls subscriber B and establishes a speech
path. A system-detected fault occurs. The system initiates an
uncontrolled Warm SWACT on the XPM connected to subscriber A.
The subscriber maintains the speech path. When subscriber A attempts
to set up a three-way call, the system ignores the hook flash.
The Enhanced Warm SWACT features improve the XPM code in the
SMS that handles the Warm SWACT operation. This feature allows
flash-activated subscriber features to maintain flash-hook ability over a
controlled Warm SWACT under specified conditions. These conditions
relate to the line service options for the line that survived the SWACT.
Note: The enhanced warm SWACT feature is for controlled warm
SWACTS only. An enhanced warm SWACT occurs when the following
events occur:
operating company personnel issue the SWACT command
the SWACT occurs as part of the REX test sequence.
Subscriber A calls subscriber B, and establishes a speech path. A REX
test causes a Warm SWACT to occur on the SMS that connects to
subscriber A. The speech path continues over the SWACT. Subscriber
A flashes the hook switch to set up a three-way call. Subscriber A
receives a dial tone. Subscriber A dials the third party number. The
third party answers and subscriber A flashes the hook switch to connect
subscriber B. The three-way call is complete.