Furuno FELCOM 12 - Message & Signal Transfer; Ship-Originated Call

1-10
1.4 Message & Signal Transfer
1. Ship-originated Call
The following describes how an MES send a ship-to-shore message, using store-and
forward techniques.
MES
LES NCS
NCS CC
(LES network data)
CES TDM
(Assignment Request)
(MES Status
:
busy)
CES TDM
(Channel Assignment)
SES Message ch
(Message)
(Acknowledgement)
(Clear)
ISL
(MES Status
:
idle)
END
Tunes to NCS CC
Decodes BB
Tunes to SES
signalling channel
Tunes to CES TDM
Tunes to SES
message channel
Re-tunes to NCS CC
Creating message
Tunes to CES TDM
ISL
NCS updates data on this MES
to busy.
NCS updates data base
(MES status changed to idle).
Transmitting message
SES Sig. ch
Tunes to CES TDM
When LES is idle.
CES TDM
CES TDM
NCS CC
ISL) Interstation Signalling Link