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3. Log in
MES
LES NCS
NCS CC
(Registration)
ISL
Power-up
Tunes to NCS CC
Informs other NCSs.
Updating ship list
SES Signalling Channel
(Log in Request)
NCS CC
(Log in ACK)
4. Log out
MES
LES NCS
(MES Status)
ISL
Informs other NCSs.
Deleting MES from
ship list
SES Signalling Channel
(Log out Request )
NCS CC
(Log out ACK)
ISL) Interstation Signalling Link
Login and Logout
Each time the DTE and Communication Unit are turned on, the vessel should be
registered with the Inmarsat C system to enable communications between vessel and
CES. This is called login.
If the vessel is not going to be using the equipment for a prolonged period it should
logout from the Inmarsat C system so the vessel can be registered as inactive.
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