9-1
9. SYSTEM
DESCRIPTION
Inmarsat Fleet F77
The Inmarsat Fleet F77 system provides a truly portable 64 kbps ISDN
communications service for data and voice transmissions to and from
mobile/fixed subscribers anywhere within the worldwide coverage of the
Inmarsat 3 spot Beam system,
see map later in the Service Guide.
The benefit of the INMARSAT system is its high capacity, and the rapid and
reliable connection between the land based (fixed) users and the
Mobile Earth
Stations (MESs)
.
Each satellite region is under the control of a
Network Coordinating Station
(NCS)
, which controls and monitors the traffic between the MESs and the LESs.
NCS:
Network Coordinating Station, one in each Ocean Region (supervises all
messages and signals sent in the Inmarsat system).
LES:
Land Earth Station w/Net service providers interconnects fixed
telecommunication networks with the Inmarsat system.
MES:
Mobile Earth Station (FELCOM 70, user terminal for the Inmarsat system).
LES
TELEPHONE
NETWORKS
DATA
NETWORKS
8
5
NCS
MES
Overview of the Inmarsat GAN system.
Содержание FELCOM 70
Страница 1: ...INMARSAT FLEET F77 SHIP EARTH STATION FELCOM 70...
Страница 26: ...2 OPERATION FROM HANDSET 2 14 This page is intentionally left blank...
Страница 90: ...5 CONFIGURATION FROM PC 5 40 This page is intentionally left blank...
Страница 186: ...6 DATA COMMUNICATION 6 96 This page is intentionally left blank...
Страница 215: ...APPENDIX MAINTENANCE PARTS AP 3 HPA block HPA pcb HPA CONT pcb PWR pcb DIP LNA TR block...
Страница 216: ......