ITU-R M 1082-1-1997 International Maritime MF HF Radiotelephone System with Automatic Facilities Based on Digital Selective Calling Signalling Format《带有基于DCS信令格式自动设施的国际海上MF HF无线电话系.pdf
《ITU-R M 1082-1-1997 International Maritime MF HF Radiotelephone System with Automatic Facilities Based on Digital Selective Calling Signalling Format《带有基于DCS信令格式自动设施的国际海上MF HF无线电话系.pdf》由会员分享,可在线阅读,更多相关《ITU-R M 1082-1-1997 International Maritime MF HF Radiotelephone System with Automatic Facilities Based on Digital Selective Calling Signalling Format《带有基于DCS信令格式自动设施的国际海上MF HF无线电话系.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、 STD-ITU-R RECMN M-1082-L-ENGL II777 m it855212 0532758 781 m 266 Rec. ITU-R M.1082-1 RECOMMENDATION ITU-R M. 1082- 1 * INTERNATIONAL MARITIME MFMF RADIOTELEPHONE SYSTEM SELECTIVE CALLING SIGNALLING FORMAT (Question ITU-R 93/8) WITH AUTOMATIC FACILITIES BASED ON DIGITAL (1994-1997) Summary This Reco
2、mmendation provides for a means to establish a fully automatic radiotelephone service for vessels to send and receive calls via the public switched telephone network (PSTN) using MF/HF equipment. The Recommendation contains detailed operational procedures, timing diagrams for call Set-up sequences a
3、nd a description of factors which differ between MF/HF and VHF systems. The ITU Radiocommunication Assembly, considering that a maritime MF/HF radiotelephone system providing automatic connection with the public switched that a maritime VHF radiotelephone system providing automatic connection with t
4、he PSTN is described in a) telephone network (PSTN) would improve traffic handling and the efficiency of the use of the radio channels; b) Recommendation ITU-R M.689 and might, suitably modified, be used in MF and HF; c) d) in widespread use by ships and coast stations in the maritime mobile service
5、; e) working channels; f) can be used for signalling over the radio path for an automatic system using a DSC channel; g) use for manual operations from ships or coast stations, that international standardization is of great importance in the maritime mobile service; that the existing public correspo
6、ndence channels listed in Article 60 (S52) of the Radio Regulations (RR) are that FtR Articles 60 (S52) and 65 (S57) do not permit coast stations to emit signals on idle radiotelephone that the digital selective-calling (DSC) system described in Recommendations ITU-R M.493 and ITU-R M.541 that the e
7、xisting RR Article 60 (S52) channels can be used in such an automatic system without impairing their recommends 1 that the operational procedures described in Annex 1 be observed when operating an international radiotelephone system with automatic facilities based on the DSC signalling format and us
8、ing the public correspondence channels listed in RR Article 60 (S52); 2 that the same RR Article 60 (S52) channel can be used for both automatic and manual operation by the same coast station depending on the requirements of the ship stations; 3 that the technical characteristics of the ship and coa
9、st station equipment should be in accordance with Annex 2. * This Recommendation should be brought to the attention of the International Maritime Organization (IMO) and the Telecom- munication Standardization Sector (IW-T). COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLice
10、nsed by Information Handling ServicesRec. ITU-R M.1082-1 ANNEX 1 267 Operational procedures 1 Introduction These procedures are initiated by using DSC on an appropriate MF or HF paired DSC calling channel and based on the technical characteristics and operational procedures detailed in Recommendatio
11、ns ITU-R M.493 and ITU-R M.541. Connection to the PSTN is effected using any appropriate MF or HF public correspondence working channel listed in RR Article 60 (S52) without in any way impairing their use for manual operations. Appendix 1 illustrates the timing of the call Set-up, calling and acknow
12、ledgement sequences described by these procedures, in the ship-to-shore direction and in the shore-to-ship direction. Appendix 2 indicates the factors which are not the same in MF/HF as in VHF. 2 Operational procedures in the ship-to-shore direction 2.1 Ship station initiates caii 2.1.1 DSC equipmen
13、t as follows: The user aboard the ship (hereafter referred to as the user) composes the calling sequence (see Note 1) on his selects the format specifier 123 (individual station automatichemiautomatic service); enters 9-digit address (identification) of required coast station; selects the category r
14、outine (1 00); (the ship station self-identification is entered automatically); selects first and second telecommands as appropriate (for a normal radiotelephone call these would be 109 (J3E) and 126 (no information) respectively); the ships position should preferably be inserted so that the coast s
15、tation can use this information to select the working channel and/or directional antennas. In the absence of any information, the symbol 126 will be automatically inserted 6 times (see Recommendation ITU-R M.493, Annex 1, Q 8.2.2, Note and Table 7); inserts the required subscriber number (e.g. telep
16、hone number); selects “end of sequence” signal “RQ. NOTE 1 -It is assumed that commercial equipment will be produced which simplifies the composition of the calling sequence. In practice the user should only need to key the coast station address and the required subscriber number, all other informat
17、ion being inserted automatically. 2.1.2 The user selects the MF or HF DSC ship-to-shore calling frequency appropriate to the coast station and transmits the calling sequence, after checking as far as possible that there are no DSC calls in progress on that frequency. 2.1.3 DSC shore-to-ship frequenc
18、y (see $2.2) within 25 s, the user should: - If the ship station does not receive an error-free acknowledgement from the called coast station on the paired in the case of MF, repeat the transmission of the DSC call in accordance with 3 2.1.2; in the case of HF, either repeat the transmission of the
19、DSC call on the same frequency or initiate a call on another DSC frequency (which may prove better from the propagation standpoint than the frequency initially chosen). - COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECNN
20、N-3082-3-ENGL 3997 4855232 0532960 33T = 268 Rec. ITU-R M.1082-1 2.2 Coast station acknowledgement 2.2.1 The coast station can comply immediately with the call request 2.2.1.1 If, on receipt of an error-free calling sequence, the coast station can comply immediately with the call request, then it sh
21、ould, within 3 s of receiving it, transmit an acknowledgement sequence on the paired DSC shore-to-ship frequency. The acknowledgement sequence should contain the same information as in the call request, with the following exceptions: - - the address will be that of the ship, the self-identification
22、will be that of the coast station, - the working frequencylies or channel number will be included (see Recommendation ITU-R M.493, Annex 1, 0 8.2.2) and should be normally in the same band as that of the received DSC call, the “end of sequence” signal will be “BQ. - 2.2.1.2 After receiving the calli
23、ng sequence, the coast station should within 10 s switch to the working frequencylies indicated and then transmit an “engaged channel” signal on the working channel transmission frequency. In the case of an HF link, if the coast station uses directional antennas, it is possible to set up a transmiss
24、ion chain (one transmitter + one transmitting antenna and one receiver + one receiving antenna) corresponding to the geographical location of the ship station. 2.2.1.3 frequencyhes indicated. After receiving the acknowledgement sequence, the ship station should within 5 s switch to the working 2.2.2
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