Nera saturn bp, Техническое руководство

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11
Saturn Bp Portable – Technical Manual
NCS Common Ch (
NCSC
)
NCS
Assignment Ch (
NCSA
)
NCS Registration (
NCRA
)
NCS Spot beam (
NCSS
)
MES
Saturn Bp
Portable
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
)
Signalling Channels
Communication Channels
(SCPC = Single Channel Per Carrier)
Public Switched
Telephone
Networks
ISDN
Packet Switched
Data Networks
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 & 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
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