Nortel DMS 100 Series Maintenance Manual page 96

4-6 RSC-M Signaling and Communications
Figure 4-3 Call origination sequence CAS to CAS
t
i
m
CAS
e
*
Start T1, T2
*
Stop T2
Start T3
last digit
* Stop T3
**
Start T7
*
Stop T7
Start T9
*
Stop T9
Stop T1
Call origination sequencing from a CAS line to a CAS line.
1. AMC to originating exchange After the originating exchange receives a
2. Originating exchange to terminating exchange An outgoing route is
297-8223-550 Standard 04.02 November 2000
originating
office
seizure
*
digits
*
*
call established
seizure signal from the CAS AMC, the T1 and T2 timers start. When the
originating exchange receives the first digit, the T2 timer stops and T3
starts. The T3 timer restarts after each digit is received.
selected and IFAM is sent to the terminating exchange after the
originating exchanges receives all digits. Digits analysis can define the
number length. When digits analysis defines the number length the T3
timer is stopped. When a number length that is not known occurs, the
expiration of the T3 timer indicates the last digit. After an IFAM is sent,
the T7 timer is started.
terminating
BTUP
IFAM
**
ACM
*
ring-
ing
ANM
*
speech
CAS
office
call arrival
cadenced using ringing
and silence signals
call established