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SECTION 1
INTERWORKING WITH STANDARD A INMARSAT SYSTEM
Recommendation Q.1100
STRUCTURE OF THE RECOMMENDATIONS ON THE
INMARSAT MOBILE SATELLITE SYSTEMS
1 General
This Recommendation gives an overview of those in the Q.1100-Series for interworking between
the international public switched telephone network/ISDN and the INMARSAT mobile
satellite systems. It also contains definitions of the terminology used in these
Recommendations.
2 Terminology
2.1 aeronautical (ground) earth station (GES)
An earth station in the fixed satellite service or, in some cases, in the aeronautical mobile-
satellite service, located at a specified fixed point on land to provide a feeder
link for the aeronautical mobile-satellite service (see Radio Regulations Article 1).
2.2 aircraft earth station (AES)
A mobile earth station in the aeronautical mobile-satellite service located on board an
aircraft (see Radio Regulations Article 1).
2.3 mobile satellite switching centre (MSSC)
Indicates the signalling interworking point between the fixed networks and the mobile satellite
system which works to a single ocean area. The MSSC may be located at the antenna
site of the aeronautical ground earth station or coast earth station, in which case it
may operate as an independent international switching centre (ISC) connected to one or
more ISCs, on national switching centres. It may also be located remotely from the
antenna site, as a supplement to, or a part of an ISC. The term MSSC may also indicate aw
maritimew satellite switching centre, with an identical functional definition to the
above.
2.4 international switching centre (ISC)
The exchange (at the end of an international circuit) which switches calls destined to or
originating from another country.
2.5 ship earth station (SES)
A station in the maritime mobile satellite service intended to be used while in motion or
during halts at unspecified points and which is located on board a ship (see Radio
Fascicle VI.14 - Rec. Q.1100 1
Regulations Article 1).
2.6 integrated services digital network (ISDN)
An integrated digital network in which the same digital switches and digital paths are used to
establish connections for different services, such as telephony, data, and so on (see
CCITT I-Series Recommendations).
2.7 telephone user part (TUP)
This defines the necessary telephone signalling functions for use of Signalling System No. 7
(SS No. 7) for international call control signalling. It is specified with the aim of
providing the same feature for telephone signalling as other CCITT telephone
signalling systems (see CCITT Recommendation Q.721).
2.8 ISDN user part (ISUP)
This encompasses the signalling functions in SS No. 7 required to provide switched services and
user facilities for voice and non-voice applications in an ISDN (see Recommendation
Q.761).
2.9 signalling connection control part (SCCP)
This provides in SS No. 7 additional functions to the message transfer part to cater for both
connectionless as well as connection oriented network services, to transfer circuit
related, non- circuit related signalling information, and other types of information
between exchanges and specialised centres in telecommunication networks (see CCITT
Recommendation Q.711).
2.10 coast earth station (CES)
An earth station operating in the fixed satellite service frequency bands or, in some cases, in
the maritime mobile-satellite service frequency bands located at a specified fixed
point on land to provide a feeder link for the maritime mobile-satellite service (see
Radio Regulations, Article 1).
3 Overview of Recommendations
3.1 Recommendation Q.1101
Sets out the general requirements for interworking between the first generation (Standard A)
INMARSAT system and the international public telephone network. A brief description
of the INMARSAT Standard A system is also included.
3.2 Recommendation Q.1102
Specifies the interworking between the INMARSAT Standard A system and Signalling System R2.
3.3 Recommendation Q.1103
Specifies the interworking between the INMARSAT Standard A system and Signalling System No. 5.
3.4 Recommendation Q.1111
Provides information on services offered in the INMARSAT Standard B system, and describes the
requirements for connection and internetworking with the public networks. A brief
description of the Standard-B system is appended.
2 Fascicle VI.14 - Rec. Q.1100
3.5 Recommendation Q.1112
Presents the procedures for interworking between the INMARSAT Standard B system and the
signalling systems of the international public network.
3.6 Recommendation Q.1151
Provides information on the services offered in the INMARSAT aeronautical system and describes
the requirements for connection and interworking with the public networks. A brief
description of the aeronautical system is appended.
3.7 Recommendation Q.1152
Presents the procedures for interworking between the INMARSAT aeronautical system and the
signalling systems of the international public network.
Fascicle VI.14 - Rec. Q.1100 3