Nera Saturn Bm Marine Mk2, Техническое руководство

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13
Saturn Bm Mk2 Marine – Technical Manual
S y s t e m D e s c r i p t i o n
S y s t e m D e s c r i p t i o n S y s t e m D e s c r i p t i o n Communication Sequences Cont’d
LES
Land Earth Station
NCS
Network
Coordination
Station
MES
Mobile Earth Station
Switches to "In-band
signalling" mode and
sends channel
release SUs.
(Delay up to 2 min if
called party)
Terrestrial side
ON-HOOK
O N-HOOK.
MES switches to "In-band
signalling" mode and sends
6 frames of "Channel
Release" SUs,
then turns off carrier.
MES-SIG
Clear forward.
Observes MES carrier
off, then turns off LES
carrier and sends
"Notification of
Channel Release" SU
to NCS.
Removes MES from
LES busy list.
LESI
Removes MES from
NCS busy list, and
updates channel
status table.
LES-SIG
LESI
Removes MES from
NCS busy list, and
updates channel
status table.
ON-HOOK.
MES switches to "In-band
signalling" mode and
sends 6 frames of channel
release SUs,
then turns carrier off.
MES-SIG
Observes MES carrier
off, then turns off LES
carrier and sends
"Notification of
Channel Release" SU
to NCS.
Removes MES from
LES busy list.
INMARSAT-B
MES or Fixed Call Release
V
oice Mode
Signalling Mode
V
oice Mode
Signalling Mode
✳
Saturn B
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