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Inmarsat previous standards

Inmarsat– A

Inmarsat-A — the first standard in communication system Inmarsat, put into operation in 1982.

Provides bidirectional telephone communication, telex, fax, e-mail, data transmission (at rate up to 64 kbit/s) in analogue mode. Satellite terminals of standard Inmarsat-A have relatively small size, they are mostly used at ships and onshore facilities. Currently the standard has gone out of date, its operation was stopped from 31.12.2007.  

Inmarsat-B

Inmarsat-B is the digital standard in Inmarsat communication system. It was put into operation in 1993. It was developed in elaboration of the standard Inmarsat-A with regard to more rational use of frequency resource. It provides the whole range of services of Inmarsat-A at lower cost. Satellite terminals Inmarsat-B are mostly used at ships and onshore facilities. Currently the standard has gone out of date, its operation was stopped from 09.01.2017.  

 

Inmarsat- Mini-M

Inmarsat Mini-M standard is put in operation in 1992. It provides global communication – telephone, fax, data transmission with comparatively inexpensive and compact terminals. Inmarsat Mini-M standard uses digital methods of information transmission at the rate of 4.8 kbit/s for fax and data transmission mode, operation is performed in zonal beams. Subscriber terminals Inmarsat Mini-M are used for arrangement of satellite communication on mobile objects including ships, automobiles, as they are intended for mobile use as portable compact devices. Currently the standard has gone out of date, its operation was stopped from 09.01.2017.  

Inmarsat– М4 GAN

Inmarsat standard М4 GAN was put in operation in 1999, provides work in  (Global Area Network (GAN)), including voice communication (4.8 kbit/s), fax (groups 3 and 4), high-speed data transmission (up to 64 kbit/s), ISDN (Integrated Services Digital Network), MPDS, access to Internet/Intranet, e-mail, video conferences. 

Subscriber terminals Inmarsat-M4 provide operation in networks with circuit switching, as well as in networks with packet switching. Difference is in the fact that in the first instance the service is rated by connection time without regard to amount of information transmitted, in the second – the amount of transmitted and received data is rated whereas connection time is not considered.  

Subscriber terminals Inmarsat-М4 have comparatively small size (compatible to a laptop computer), they are used at stationary onshore facilities and as portable satellite terminals. Currently the standard has gone out of date, its operation was stopped from 09.01.2017.  

Inmarsat Fleet

Inmarsat Fleet standard is used for communication between sea subscribers and provides services similar to standard Inmarsat M4. Fleet subscriber terminals may be divided into 3 types:  Fleet 77, Fleet 55 and Fleet 33. Each type of terminals provides particular set of services. 

Terminals Fleet 77 operate in global beams and provide low-speed telephone communication

(4,8 kbit/s), fax  (2.4 or 9.6 kbit/s), ISDN networking  (56/64/128 kbit/s, Audio 3.1 KHz, Speech 64 kbit/s), and Multiservice Packet Data Service  (MPDS) — up to 64 kbit/s. Operation in MPDS mode is rated not by connection time, but for transmitted/received amount of data.

Terminals Fleet 55 may work in global (voice), as well as in zonal beams. In zonal beams Fleet 55 provide almost the same performance as Fleet 77, except for ISDN 128 kbit/s. Fleet 33 provide voice transmission in global and zonal beams, as well as transmission of data and facsimile messages at the rate of 9.6 kbit/s and MPDS in case of operation in global beam.

Inmarsat-D/D+

Standard Inmarsat D/D+ was put in operation in 1996. It provides low-speed data transmission. Subscriber equipment Inmarsat D/D+ is mainly used in transportation management systems, remote control systems and for autonomous information retrieval from remote objects.

Inmarsat standards for aviation

Inmarsat — Aero

Inmarsat-Aero standard provides the following services:

Aero-L – provides on-line low-speed data transmission (600 bit/s). Subscriber terminals Aero-L are mainly installed on helicopters and light aircrafts. The standards meets the requirements of ICAO  (International Civil Aviation Organization) on ensuring aviation security and safety of aircraft management.

Aero-I – designed for small and average aircrafts; certified by ICAA — International Civil Aviation Authority – for ensuring aviation security and safety of aircraft management. Equipment Aero-l standard provides possibility for passengers and crews of aircraft to use telephone and fax communication, batch data transmission at rate from 600 bit/s to 4.8 kbit/s.

Aero-H – provides multi-channel telephone and facsimile communication and transmission of data to the benefit of passengers and crews of aircrafts. Standard Aero-H+ operates through third generation satellites and applies zonal beam technology.

Aero Mini-M – provides passengers of aircrafts with telephone and facsimile communication, allows to transmit data at the rate of 9.6 kbit/s. Used mostly for commercial aviation. Currently the standard has gone out of date, its operation was stopped from 09.01.2017.