Nortel DMS 100 Series Maintenance Manual page 98

4-8 RSC-M Signaling and Communications
Call release sequencing from a CAS line to a CAS line (originator release).
1. AMC to originating exchange When a calling subscriber goes on-hook,
2. Originating exchange to terminating exchange During the release
3. Terminating exchange to AMC When the terminating exchange receives
4. Terminating exchange to originating exchange The terminating exchange
5. AMC to terminating exchange When the terminator goes on-hook, the
Figure 4-5 Call release sequence CAS to CAS (terminator release)
t
i
m
e
*
Start long TRD
*
Start T1'
and T5
*
Stop T1'
and T5
297-8223-550 Standard 04.02 November 2000
the AMC node sends a clear forward signal to the originating exchange.
The originating exchange sends a disconnect clear signal backwards for
480 ms followed by idle code.
sequence the originating exchange sends a REL message to the
terminating exchange and starts the T1' and T5 timers.
the REL message, the terminating exchange starts the release sequence.
The release sequence starts when the exchange sends a clear forward
message to the AMC node.
sends an RLC message to the originating exchange. The RLC message
releases the outgoing trunk and stops the T1' and T5 timers.
AMC node sends a disconnect clear to the terminating line for 480 ms
followed by idle code.
CAS
clear back
clear forward
disconnect clear
480 ms
originating
office
BTUP
speech
*
REL
*
*
idle
idle
terminating
CAS
office
clear back
SUS
disconnect clear
RLC
480 ms
idle