11
Saturn Bm Mk2 Marine – Technical Manual
NCS Common Ch (
NCSC
)
NCS
Assignment Ch (
NCSA
)
NCS Registration (
NCRA
)
NCS Spot beam (
NCSS
)
MES
Saturn Bm
Marine
terminal.
MES Request Ch (MESRQ)
MES Region Registration Ch (MESRR)
MES Call Acknowledge Ch (MESCA)
SCPC In-band Signalling (MESSIG)
SCPC In-band Signalling (LESSIG)
SCPC Voice (MESV/VSUB)
SCPC Voice (LESV/VSUB)
SCPC Data (MESD/DSUB)
SCPC Data (LESD/DSUB)
LES
The Land Earth Station
routes messages to/from
the MESs within the
coverage area of one of
the four Inmarsat
satellites.
NCS/NCS
Signalling Links
NCS
The Network Coordinating
Station controls the satellite
resources to LESs and
MESs within a single
satellite coverage area.
MES Region Registration Ch (
MESRR
)
MES Response Ch (
MESRP
)
MES Request Ch (
MESRQ
)
NCS Interstation Ch (
NCSI
)
LES Interstation Ch (
LESI
)
(SCPC = Single Channel Per Carrier)
Public Switched
Telephone
Networks
ISDN
Packet Switched
Data Networks
1
4
T L NO
Saturn B
Sa urn B
NERA
Communication Channels
Designation
Transmission
Type of information
LESV
MESV
LESD
MESD
SCPC with
Duplex 16 kbps voice
VSUB sub-band
communication
signalling
SCPC with
Duplex 9.6 kbps data
VSUB sub-band
communication
signalling
Signalling Channels
Designation
Transmission
Type of information
NCSI
LESI
NCSC
MESRP
NCSA
MESRQ
MESCA
NCSS
MESRR
NCRA
MESSIG
LESSIG
Continuous TDM
Bi-directional signalling information
between LES and NCS
TDM
Bulletin Board announcements.
TDMA
MES responses
Continuous TDM
Assigns SPCS channels
Slotted Aloha
Request from MES to LES
Slotted Aloha
Acknowledges shore-originated
simplex calls.
Continuous TDM
One frequency per spot beam;
enables an MES to identify beam
serving location.
Slotted Aloha
Registration signal to LES/NCS.
Continuous TDM
Acknowledgement from NCS to
MES
SCPC
In-band signalling
Signalling & Communication Channels
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
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