1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 Recommendation F.125 for telex numbering in the Maritime Mobile-Satellite Service; numbering plans for maritime mobile (terrestrial) systems are for further study.Note 2 In this Recommendation the term ship station is intended to also include, for simplic
2、ity, ship earthstation.1.2.4 coast station identityF: identit de la station ctireS: identidad de estacin costeraThe coast station identification X1, X2 Xktransmitted on the radio path.Note In this Recommendation the term coast station identity is intended to also include. for simplicity, coastearth
3、station identity.1.3 Basic considerationsThe considerations that form the basis of this ship station identification system are:a) that every ship shall have a unique ship station identity;b) that the same unique ship station identity should be used in both VHF/UHF and Maritime Mobile-SatelliteSystem
4、s;c) that the same unique ship station identity should be used for all telecommunication services;d) that it is desirable that the ship station number and the ship station identity are related in a simple andunambiguous manner;e) that the capacity of the ship station identification system shall be s
5、ufficient to admit all ships wanting, orrequired, to participate in the various Maritime Mobile Services at present and in the foreseeable future;f) that the ship identity system shall be a numerical system, and should use the full range of decimal digits;g) that two or three of the digits, X1X2X3,
6、of the ship station identity shall indicate the ships nationality.2 Ship station identificationShip station identity is established as nine digits.X1X2X3X4X5X6X7X8X9Fascicle II.4 - Rec. F.120 3The initial three digits define the nationality of the ship as indicated in the following sections.Since th
7、e whole or a part of the ship station identity is used in the ship station number, certain restrictions maybe imposed on the allocation of ship station identities for the Maritime Mobile-Satellite Service. Such restrictions areidentified in Recommendations E.215 and F.125. The use of the ship statio
8、n identity in maritime mobile (terrestrial)systems is for further study.3 Assignment of ship station identification3.1 Assignment of blocks of numbersBlocks of numbers should be assigned to countries so that individual Administrations may systematicallyassign ship station identities within those blo
9、cks.3.2 Identification of ships geographical regionThe first digit of each ship station identity is intended to identify the geographical region to which thenationality (registry) of the ship relates. Only the digits 2 through 7 are used for this purpose to identify easily theworlds regions as follo
10、ws:2 Europe3 North America4 Asia (except Southeast Asia)5 Oceania and Southeast Asia6 Africa7 South America.Arrangements may therefore be made to systematically assign a ship station identity to each ship as soon asnational blocks are allocated. The digits zero (0), one (1), eight (8) and nine (9) a
11、re allocated for other purposes asindicated below.The digits eight (8) and nine (9) are not used for identification of geographical regions. However, for maritimeVHF/UHF systems, the digits 8 and 9 may be used to expand network access as shown in 8.2. The allocation of thefirst digit of the ship sta
12、tion identity is summarized in Table 1/F.120.4 Fascicle II.4 - Rec. F.120TABLE 1/F.120Allocations of first digit (X1) in the ship station identityFirst digit (X1) of shipstation identityUse0 Group call/coast station identity1 Reserved for future expansion2 Europe3 North America4 Asia (except Southea
13、st Asia)5 Oceania and Southeast Asia6 Africa7 South America8 See 8.29 See 8.23.3 Identification of ships nationalitySince blocks of the ship station identities would be systematically assigned by country, a ships nationality canbe determined by analysing the first three digits of its ship station id
14、entity.The digits to be analysed are called Maritime Identification Digits (MID). Examples of the maritimeidentification digits for ships are given in Table 2/F.120.TABLE 2/F.120Country Maritime identificationsdigits (MID)Ship station identityP 231from 231 000 000to 231 999 999Q 233, 234from 233 000
15、 000to 234 999 999R 236, 237, 238from 236 000 000to 238 999 999S 240 to 249from 240 000 000to 249 999 999Fascicle II.4 - Rec. F.120 54 Assignment of maritime identification digitsEach MID represents a discrete capacity assigned according to a plan that relates assigned capacity to shippopulation. A
16、plan has been developed by the World Administrative Radio Conference for the Mobile Services (MOB-83) 2 and is contained in Appendix 43 to the Radio Regulations 1. The Radio Regulations make provision for theallocation of additional MIDs for a specific country when necessary.5 Group callsX1= 0, X2 =
17、 1 to 9 and X1= 0, X2= 0, X3= 0, X4= 0 to 9 are assigned to indicate a group call to a group ofships having a community of interest. Such calls may be barred in the public switched network and/or at the coaststations. Control of group calls may also be achieved by the use of special group service ac
18、cess to the coast stations.The group call numbering scheme used in the INMARSAT system is given in Annex B to Recommendation E.215 andin Annex B to Recommendation F.125.6 Coast station identityX1= 0, X2= 0, X3= 1 to 9 are assigned to indicate coast station identities in maritime mobile (terrestrial)
19、systems.7 Future expansion of the ship station identification systemX1= 1 as in the format 1 XXXXXXXX has been reserved for future expansion.Note X1= 1 is used in the INMARSAT standard A system for identification of ship earth stations (seeRecommendations F.125 and E.215).8 Considerations related to
20、 ship station identity assignment8.1 The ship station identity, or part of it, will be included in the INMARSAT mobile number. The way in whichthis is done for INMARSAT mobile numbers is described in Recommendations E.215 and F.125.The relationship between the nine-digit ship station identity and th
21、e part of it which is used in the ship stationnumber is illustrated in Table 3/F.120. If the part of the identity used in the number is shorter than nine digits, then thecorresponding identity is obtained by adding trailing zeros to form nine-digit ship station identities. This principle mustbe obse
22、rved when allocating ship station identities for ships in the Maritime Mobile-Satellite Service (seeRecommendations E.215 and F.125).TABLE 3/F.120Part of ship station identityused in ship station numberDigits on the automaticnetworkShip stations identityDigits in the ship stationidentityMID X4X5X66
23、MID X4X5X6000 9MID X4X5X6X77 MID X4X5X6X700 9MID X4X5X6X7X88 MID X4X5X6X7X809MID X4X5X6X7X8X99 MID X4X5X6X7X8X998.2 Numbering plans for the maritime mobile (terrestrial) services are for further study. The principle of 8.1 islikely to apply for these services also.For maritime mobile (terrestrial) s
24、ervices, additional ship station numbering techniques may be used to expandnetwork access to more ship stations on a regional and national basis as follows:6 Fascicle II.4 - Rec. F.120Ship station number(or part thereof)Ship station identity8Y X4X5X6X7MyIyDyX4X5X6X7009 X4X5X6X7X8MnInDnX4X5X6X7X80In
25、this arrangement, the digits 8Y may be 80 to 89 to define as many as ten foreign MIDs (shown as MyIyDy) topermit automatic calling of ships of particular nationalities. The coast station would be required to translate a given 8Yto a particular foreign MID. The digit 9 may be used to indicate the mar
26、itime identification digits for ships of the samenationality as the network and the coast station. The coast station would be required to translate 9 to one particularnational MID (shown as MnInDn).References1 Radio Regulations, ITU, Geneva, 1982, revised in 1985, 1986 and 1988.2 Final Acts of the World Administrative Radio Conference for the Mobile Services (MOB-83), ITU, Geneva,1983.
