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- Recommendation X.352
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- INTERWORKING BETWEEN PACKET SWITCHED PUBLIC DATA NETWORKS
- AND PUBLIC MARITIME MOBILE SATELLITE DATA TRANSMISSION SYSTEMS
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- xxxxxx
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- 2. References
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- I.112 Vocabulary of terms for ISDNs,
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- I.210 Principles of telecommunication services supported by an ISDN,
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- I.230-SeriesBearer Services supported by an ISDN,
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- I.240-SeriesTeleservices supported by an ISDN,
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- I.250-SeriesDefinitions and description of Supplementary Services,
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- I.340 ISDN connection types,
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- I.411 ISDN user-network interfaces - Reference configuration,
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- I.420 Basic user-network interface,
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- I.421 Primary rate user-network interface,
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- I.500/I.510 Definitions and general principles for ISDN interworking,
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- Q.700-SeriesSpecifications of Signalling System No. 7,
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- X.1 International user classes of service in public data
- networks (PDNs) and ISDNs,
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- X.2 International data transmission services and optional user
- facilities in PDNs,
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- X.10 Categories of access for data terminal equipment to public data
- transmission services,
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- X.20
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- 2.2 A public maritime mobile earth station calling another
- mobile earth station
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- If the two public maritime mobile earth stations are in the same ocean area
- or are in different ocean areas covered by the same MSDSE, the MSDSE sets up the
- call directly to the called public maritime mobile earth station so that only one
- MSDSE will be involved in the call.
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- If the two public maritime mobile earth stations are in different ocean
- areas which are not both covered by the same MSDSE, the calling MSDSE will route
- the call in accordance with 2.1 above.
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- defined within the public maritime mobile-satellite systems. Such abbreviated codes
- require conversion to the full international data number before the call can be
- forwarded from the MSDSE to a PDN.
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- 3. Routing of land originated calls to public maritime mobile
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- earth stations
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- Further, the first digit of the following Network Terminal Number in the
- public maritime mobile-satellite system is the "T" digit defined in Recommendation
- E.215/F.125 which is used for discrimination between different public maritime
- mobile-satellite systems.
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- A calling user can only indicate which ocean area and public maritime
- mobile-satellite systems (such as INMARSAT Standard A, B and C), type is addressed,
- and cannot select a specified MSDSE. Therefore each originating and/or transit
- network has normally to route data calls within one of the public maritime mobile
- system DNICs to a pre-determined MSDSE which serves the ocean area and system type
- as indicated by the DNIC and T digital according to bilateral agreement between the
- administration of origin and the administration operating the MSDSE. Thus, analysis
- of five digits of the called number is required for routing purposes.
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- another data number (but to the same public maritime mobile earth station), which
- only differs in ocean area, when a mobile earth station is absent from the ocean
- area indicated by the original data number. The re-routing of a call between the
- two ocean areas covered by the MSDSE should be carried out only once.
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- The condition for re-routing is that the public maritime mobile earth
- station is included in the list of mobile earth stations and is not barred from
- incoming access.
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- existing X-Series Recommendations and to the public maritime mobile-satellite
- system specifications and is therefore left for further study.
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- Recommendation E.215/F.125 should be barred. Such addresses are public maritime
- mobile earth station numbers with a T digit 0. The call should preferably be barred
- in the network of origin. However, the MSDSE must in any case be capable of barring
- such calls. (See also Recommendation X.350).
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- The link between the coast earth station and a public maritime mobile earth
- station is always a satellite link.
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- Hence, for a call destined to a public maritime mobile earth station, all
- transit exchanges should recognize from the destination DNIC of 111S that the final
- link is a satellite link and perform routing so that the maximum permitted transit
- delay from the calling user to the called user is not exceeded.
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