Nortel DMS 100 Series Maintenance Manual page 108

4-18 RSC-M Signaling and Communications
Figure 4-10 Call release sequence DC5A to DC5A (terminator release)
t
i
m
e
*
Start long TRD
*
Start T1' and T5
*
Stop T1' and T5
Call release sequencing from a DC5A line to a DC5A line (terminator release).
1. AMC to terminating exchange When a called subscriber goes on-hook,
2. Originating exchange to AMC After the previous originating exchange
3. AMC to originating exchange When a calling subscriber goes on-hook,
4. Terminating exchange to AMC When the terminating exchange receives
5. AMC to terminating exchange The AMC signals readiness when the
297-8223-550 Standard 04.02 November 2000
DC5A/DC5ADD
clear back *
clear forward
idle
the AMC node sends a clear back signal to the exchange. The system
sends a SUS message to the previous originating exchange.
receives the SUS message, the TRD timer starts. The originating
exchange sends a clear back signal to the AMC node.
the AMC sends a clear forward signal to the originating exchange. The
exchange sends back an idle signal and stops the TRD timer. The
originating exchange sends a REL message to the next terminating
exchange, and the T1' and T5 timers start.
the REL message, the exchange sends an RLC message to the originating
exchange. This action stops the T1' and T5 timers at that exchange, and
sends a clear forward message to the AMC node.
AMC node sends an idle signal to the exchange.
originating
office
BTUP
speech
SUS
REL
*
RLC
*
idle
terminating
office
DC5A/DC5ADD
clear back
clear forward
idle