Call Sequence; Direct Call Setup Sequence - Furuno IB-681 Operator's Manual

3.4 Call Sequence

3.4.1 Direct call setup sequence

CES
SES RQ
Ch. assignment req. SU
NCSI
HSUB
Scr. vec. ack SU
HSUB
Call to
subscriber
Fill in SU
Reply from
subscriber
CES connect SU
HSUB
NCS
CESI
Channal assignment SU
Figure 5 Direct call setup sequence
12
FELCOM
Access req. SU
NCSA
Service addr. SU
scr. vec. advise SU
HSUB
Ret. carrier ID SU
HSUB
HSUB
SES connect SU
Calling operation
(DTR ON)
DSR ON
CTS/DCD ON