Home

EN 300 338-2 - V1.3.1 - Electromagnetic compatibility and

1. Pertinent to proc Receive DSC End Procedure Figure 3 Sending non distress automated procedure 6 6 2 Tasks The radio shall follow the sending non distress automated procedure as shown in figure 3 complying with the automated procedures as defined in ITU R Recommendation M 493 12 3 annex 4 The sending non distress automated procedure shall handle the following events a prior to acknowledgement 1 the transmission of the composed selected DSC message 2 if the DSC message demands no acknowledgment setting the procedure to acknowledged 3 ifthe DSC message demands an acknowledgement i on HF tuning the general receiver to the frequency of the DSC acknowledgement if required ii waiting for the acknowledgement and alarming when received iii allocating any received DSC message not pertinent to the procedure to their appropriate procedure or initiating their own procedure on hold iv providing the valid operator options which are 7 resend the initial DSC message 7 activate or place the procedure on hold 7 terminate the procedure ETSI b 6 6 3 30 Draft ETSI EN 300 338 2 V1 3 1 2008 12 upon reception of the acknowledgement or being set to acknowledged 1 2 3 4 tuning the general receiver and transmitter to the frequency of subsequent communication or displaying the requested information ignoring any received DSC message pertinent to the procedure since it is a duplicat
2. All repeat initial DSC messages shall sound the self terminating alarm ETSI 36 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 7 6 Automated tuning DSC messages requiring acknowledgements shall determine the frequency of the DSC acknowledgement based upon the frequency of the received DSC message If the channel of the DSC message cannot be determined the acknowledgment shall be sent on the same frequency as the original DSC message was received HF only If the DSC message requires subsequent communications the general receiver and transmitter shall be tuned to the frequencies of the subsequent communications given in the acknowledgement if acknowledgments are requested Otherwise the general receiver shall be tuned to the frequency of subsequent communication given by the initial DSC message a the operator shall have a 10 seconds warning prior to any tuning if the new subsequent frequency is different from the current b the operator shall be able to pause the tuning or accept the tuning 6 7 7 Acknowledgments Acknowledgment options shall only be provided if the initial DSC message requests an acknowledgement and the acknowledgment option is possible For example the able to comply option is not possible for an individually addressed DSC message requesting telephony but providing no subsequent communication frequency information Only the comply with mode frequency change and unable to comply options are possible In the
3. Telecommunications Sector MF Medium Frequency MMSI Maritime Mobile Service Identity NBDP Narrow Band Direct Printing UTC Universal Time Co ordinated VHF Very High Frequency ETSI 11 Draft ETSI EN 300 338 2 V1 3 1 2008 12 4 Controls and Indicators in Class A B DSC Equipment 4 1 Visual indication Any visual display of the information content shall be clearly legible under all ambient light conditions The display shall be large enough to hold enough information from the active procedure to safely guide the operator through operator options in any engaged DSC procedure distress or non distress It shall at any time hold information on how to instantly recall any waiting procedure or put any active procedure on hold The amount of information to display simultaneously on the display shall correspond to the information that can be written in plain text with a minimum of 160 characters each character having a minimum height of 3 5 mm and a nominal character width height ratio of 0 7 Where logic flows and procedural guidance expressed by graphical symbols have an advantage over text this shall be allowed Any graphical symbols shall be clearly defined in the operation manual All DSC displays at all operating positions shall comply with these requirements 5 Technical requirements 5 1 Facilities for DSC transmission and reception 5 1 1 Multi frequency distress alert attempts and watch receiver capabilities MF HF Th
4. The fourth figure shows what might happen if 555444322 acknowledges our individual call while another procedure is active The procedure list bar might flash as the alarm sounds indicating it needs attention or a popup message could be displayed In either case the operator must be presented with the reason for and means of silencing the alarm so one does not have to activate the procedure In this case the operator opted to press the down arrow to activate the indicated procedure The fifth figure shows the result and the operator can now silence the alarm while in the procedure ETSI 40 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Rx Distress from 222333121 Calling 555444322 Rx group call to 089934344 Waiting for coast stn 4 08 Wait for 555444322 to reply 1 11 Listening on channel 6 3 45 Rx call from 456444322 Rx call from 456444322 Rx call from 456444322 Rx group call from 699343444 Rx group call from 699343444 Rx group call from 699343444 Calling 555444322 Calling 555444322 Calling 555444322 Rx Distress from 222333121 Rx Distress from 222333121 Rx Distress from 222333121 Talking on channel 6 Talking on channel 6 Talking on channel 72 Rx group call to 089934344 Calling 555444322 Listening on channel 6 7 43 Reply 0 02 The procedure buttons could very well be physical buttons that are not part of the screen similar to many Rx call from 456444322 Rx call from 456444322 older telephones How the Rx group
5. a b c d e f g h i The distress channels shall not be used for routine category DSC messages The band of the communication channel shall be in the band of the DSC message The set of 3 000 Hz analogue channels shall be chosen for voice communications The set of 500 Hz data NBDP channels shall be chosen for data modes such as NBDP DSC messages addressed to coast station destinations shall let the coast station decide position in the frequency parameters of the DSC message DSC messages addressed to ship station destinations shall use the simplex set of channels DSC messages directed to a group or an area shall use the broadcast mode 126 s for the TX frequency in the frequency parameters of the DSC message On HF the band of the communication channel shall be in the band of the DSC message On HF the telephony channel set shall be chosen for voice communications The automated channel frequency selection shall be able to be overridden which will be necessary to select a distress channel for subsequent communications ETSI 46 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex D normative Alarms D 1 Alarm specifications Table D 1 summarizes the alarm characteristics required by the radio The Event is the reason for the alarm The sound specifies the default audio character of the alarm whose detailed characteristics are specified in table D 2 The increase specifies whether or not the alar
6. 3 DISpla vull ii O id e E E eE ii 34 6 7 3 1 Examples of receiving non distress procedures displays on VHF equipment eee eee eee eee eeee 35 6 7 4 Handling received DSC messages 0000 0 ec eeceecceseceseceseesecesecssecsaecaeecaeecseseeeeeeesesesseeseeaecsaecsaecaecaseaeeeeeees 35 6 7 5 Ad tia AEE E NEET EE AE AA E cocussbvesch sobs tii 35 6 7 6 Automated UNNE eesriie nenaon eie e a a e o aa wel da eeoa a E Eae Saoer E eaae 36 6 7 7 Ackn wl edgmM ntS O 36 6 7 8 A A A ONO 36 6 7 9 A RON 37 6 8 Communications automated procedure ssis nono conc conc cone ER nono nono n ran eran E A 37 6 8 1 PrOCEd Ue tt 37 6 8 2 TASKS NN 37 6 8 3 Disp tilo 37 6 8 4 Handling received DSC Messages initial bdo 37 6 8 5 Tuning of the general receiver and transmitter 0 0 ele cece eeeeeeeeeeceeecesecesecaecsaecsaecseecseesaecaeecaeeeaeeeetens 38 6 8 6 TEN o 38 6 9 Multiple automated procedures and parallel event handling oooononocnnoninononononanonononnnonn nono nononon crac cnn cnncconcconoo 38 6 9 1 Proc dure motne uit ou A O tous sonsousSbsawesduncasSmduhaeaedsovnrt bane leuaaterenen E ENTEN 38 6 9 2 O A OOO 38 6 9 3 Examples of multiple procedure screens ooooocnccnnccnnoncoonconoconocnono nono nono nonnnonn cnn conc nnnn cnn cnno cone cn neon nc nono nn ninnnns 39 Annex A normative DSC Message Composition csscssscsssssssscssscssscsccsscesscesccssscessessseceseseees 41 Alc Default A A OR 41 A 2 Th defaultDROBOSE tienda apes ai iaa anidan 4
7. case of a position request the option shall only require a single action by the operator to send and the procedure shall indicate non compliance by filling the position and time information with the no information character If an acknowledgement is resent by the operator it shall be identical to the first acknowledgment It shall not be possible to further edit the content 6 7 8 Termination When auto acknowledging position poll and test DSC messages the procedure shall self terminate after sending the acknowledgement When sending an unable to comply acknowledgement the procedure shall terminate after completing the transmission In all other cases termination is done manually or by the automated timeout At least ten seconds prior to automated termination a visual and discrete aural warning shall be displayed with the option to stop the automatic termination If the procedure is terminated manually by the user then integrated equipment may revert to the channel or frequency that was previously selected before the DSC procedure ETSI 37 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 7 9 Warnings The procedure shall provide warnings for those reasons provided in ITU R Recommendation M 493 12 3 annex 4 The operator shall have the option to go back to the stage of the procedure where the action was taken that caused the warning 6 8 Communications automated procedure 6 8 1 Procedure The communications automated procedure
8. case of a received individual call requesting telephony the radio shall be capable of identifying if the requested working frequency identified in the call is available in the equipment If this frequency is available the radio shall display the call details and compose an Able to comply acknowledgement which shall only be transmitted manually Switching to the frequency identified shall only be performed after a manual Able to comply acknowledgement has been transmitted If this frequency is not available the radio shall display the call details and compose an Unable to comply acknowledgement with 104 as the first telecommand and 108 as the second telecommand This acknowledgement may be automatic The able to comply option shall only require a single action by the operator to respond e g lifting the handset The operator shall not be required to compose any elements of this acknowledgement The comply with mode frequency change option shall require that the operator be able to enter select frequencies and or channels and on HF between voice and data modes before sending The operator shall not be required to compose any other elements of this acknowledgement The unable to comply option shall require that the operator select one of the 10 reasons telecommand 2 symbols 101 does not apply to ship stations specified in ITU R recommendation M 493 12 3 for being unable to comply default no reason given before sending In the
9. current b the operator shall be able to pause the tuning in case engaged in traffic or accept the tuning c prior to acknowledgement the tuning to the new frequency shall occur in the absence of any operator action d after acknowledgment the tuning to the new frequency shall only occur if the operator requests it note that the procedure is not yet acknowledged until after the first acknowledgement starts the alarm 6 5 8 Acknowledgments The procedure handling all ships and area distress DSC messages and distress alerts shall be considered acknowledged upon reception of the first distress alert acknowledgement or all ships distress relay acknowledgement A distress alert acknowledgement sent by the vessel in distress shall be recognized as a self cancel The procedure handling a received individually addressed distress relay shall be considered acknowledged when the operator first transmits the corresponding individually addressed distress relay acknowledgement to the sender ETSI 28 Draft ETSI EN 300 338 2 V1 3 1 2008 12 The procedure handling a distress relay sent to an individual station shall be considered acknowledged when the first corresponding individually addressed distress relay acknowledgement is received from that station 6 5 9 Sending Relays and Acknowledgments On HF the operator shall always have the option to send a distress relay to a coast station The operator shall not have the option to send a distress re
10. given by the initial DSC message 6 6 7 Delayed Acknowledgements If an acknowledgement to a sending non distress automated procedure is received after the procedure has been prematurely terminated the automated procedure shall initiate itself recreating the initial DSC message based upon the acknowledgement The procedure shall inform the operator that an acknowledgement we quit waiting for has been received If the acknowledging station changed the frequency or communication mode the original values will not be known but shall be assumed to be that present in the acknowledgement If the acknowledging station responded with unable to comply all the original communication information will be unknown in which case the initial DSC message shall be assumed to have been radiotelephone on any legal frequency 6 6 8 Termination Termination is done manually or by the automated timeout At least ten seconds prior to automated termination a visual and discrete aural warning shall be displayed with the option to stop the automatic termination If the procedure is terminated manually by the user then integrated equipment may revert to the channel or frequency that was previously selected before the DSC procedure 6 6 9 Warnings The procedure shall provide warnings for those reasons provided in ITU R Recommendation M 493 12 3 annex 4 The operator shall have the option to go back to the stage of the procedure where the action was taken that caused
11. is pertinent to an automated procedure if the set of information characters in the DSC message has the correct values pertinent to the station any DSC message that would start an automated procedure if the transceiver were in standby ETSI 10 Draft ETSI EN 300 338 2 V1 3 1 2008 12 self terminating alarm short alarm that stops by itself without operator intervention NOTE The purpose of this alarm is to inform the operator that a DSC message is received but it does not require his immediate attention standby the equipment is not handling an automated procedure either active or on hold but is able to receive DSC messages symbol as part of the DSC sentence the term symbol used to describe the 7 binary bits of a 10 bit DSC word that have the information content toggle between automated procedures ability to make one automated procedure active assuring that all other procedures go on hold top level top level means that items buttons or functions are present and visible without requiring any action by the operator such as scrolling opening up menus or removing any obscuring covers etc two tone alarm alarm consisting of a repetition of the 2 200 Hz frequency for 250 ms followed by a 1 300 Hz frequency for 250 ms NOTE This alarm is used for the initiation of the received distress DSC automated procedure The characteristics of this alarm on the equipment shall not be able to be altered urgency alarm alarm consi
12. of a power that is clearly distinguishable but not interfere with radiotelephone communications If not manually cancelled within 10 s the power shall start to rise to a level of at least 80 dB A within the next 10 s at a distance of 1 m from the equipment The count alarm of table D 2 shall have a power level of at least 80 dB A at a distance of 1 m from the equipment All other alarms clause D 4 shall be of an audio level or of a final level when appropriate that is clearly distinguishable but not interfere with radiotelephone communications The operator shall be unable to neither customize the two tone distress acknowledgment urgency and urgency acknowledgement alarms of table D 2 nor use these alarms for other purposes Alarms for other purposes are specified in clause D 4 Table D 2 Non configurable alarm sounds Fixed Alarm sounds Frequency Hz Frequency Hz Duration ms Duration ms Tone 1 Tone 2 Tone 1 Tone 2 two tone see note 2 200 1 300 250 250 distress ack see note 2 200 1 300 500 500 Urgency see note 2 200 Silence 250 250 urgency ack see note 2 200 Silence 500 500 count 2 000 Silence 500 500 NOTE The two tone distress ack urgency and urgency ack alarms shall not be able to be customized These alarms are continuously repeated until manually terminated D 4 Other alarm sounds The manufacturer may implement alarm sounds for the following events Routine c
13. place the procedure on hold and iii terminating the automated procedure Display During the sending distress automated procedure the radio shall display the following items and or information as appropriate at top level 1 2 3 4 5 the fact one is engaged in sending a distress the time remaining to the next automated resending of the attempt prior to acknowledgement the elapsed time since receiving the distress alert acknowledgement after acknowledgment indicate whether the procedure is on hold or is active after acknowledgement the distress information ETSI 18 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 a warning before the automated resending of the attempt in case engaged in traffic 7 the frequency of subsequent communication HF only 8 the frequencies on which the alerts are sent HF only 9 the MMSI of the sender of the distress acknowledgement 10 the sub stages of the procedure a transmitting b waiting for acknowledgement c alert acknowledged d waiting for a free channel and 11 the valid operator options 6 4 3 1 Examples of sending distress procedure displays on VHF equipment In the following set of figures examples are shown of windows that could appear on a display screen during a sending distress automated procedure at various stages during the event The first figure is what might appear after the operator holds down the dedicated distress button for 3 or more seconds
14. relevant provisions of the ITU Radio Regulations 2 and ITU R Recommendations the International Convention for the Safety Of Life At Sea SOLAS 1 and the relevant resolutions of the International Maritime Organization IMO 2 References References are either specific identified by date of publication and or edition number or version number or non specific For a specific reference subsequent revisions do not apply Non specific reference may be made only to a complete document or a part thereof and only in the following cases if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document for informative references Referenced documents which are not found to be publicly available in the expected location might be found at http docbox etsi org Reference For online referenced documents information sufficient to identify and locate the source shall be provided Preferably the primary source of the referenced document should be cited in order to ensure traceability Furthermore the reference should as far as possible remain valid for the expected life of the document The reference shall include the method of access to the referenced document and the full network address with the same punctuation and use of upper case and lower case letters NOTE While any hyperlinks included in this clause were valid at the time of publication ETSI c
15. the warning 6 7 Receiving non distress automated procedure 6 7 1 Procedure The received non distress automated procedure results when a DSC message is received that does not contain the distress information and is not an acknowledgement An informative schematic of the outline of the automated procedure is given in figure 4 ETSI 33 Draft ETSI EN 300 338 2 V1 3 1 2008 12 INCOMING DSC Message No Relevant to procedure Turn off able option 1 call Sound manual alarm after sound self terminating alarm Options if not acked Unable was able to comply if able transmitted comply with change unable to comply on hold activate end procedure Options if acked Remove unable and resend acknowledgement comply with change on hold activate user options end procedure Remove able option Set event stage acked End procedure Auto ack stage ve Auto ack stage End procedure Figure 4 Receiving non distress procedure 6 7 2 Tasks The radio shall follow the received distress automated procedure as shown in the figure 4 complying with the automated procedures as defined in ITU R Recommendation M 493 12 3 annex 4 The received non distress automated procedure shall handle the following events a sound the appropriate alarms at the appropriate times for DSC messages pertinent to the procedure b allocate DSC messages pertinent to the s
16. 2 A 3 Allowable non distress DSC message parameters oooonncnnoncconnconncnnnonnncnonnonn ccoo conan nono conocio nn ccoo nono ncnn naco necns 42 Annex B normative Radius Centre point conversion and rounding algorithm oooooooooo 43 B 1 Radius centre point conversion ecepte inin eiee i aiee reee ins rasoi i ioeie 43 B2 RR RR EE 44 B 3 Special cases for either form of area data entry 2 0 0 ceecccceeecessseceeseeceeeeeceaeceesaeceeaeeceeceeeaeeeeaueceeaeeeeaees 44 Annex C normative Automated Non Distress Channel Frequency Selection Algorithm 45 CH 5 1 ATE ARO RN 45 C2 HEren taa a E A Ta e E E edie ea atl ei te 45 Annex D normative AMS 5 scicsssssenssssuocesabssessesvonssegevoousiseuvesuschssuseseaivosbegevauvestsissstnebevonstetiustesgensoees 46 D I Alarm specifications si tannins ae isto nun A ee ete RE 46 D 2 Alarming with critical errors eeeeseccessecsseceessecessseccsscceessecessaecseeeecssneeesuececaaeceeasecscesesaecseaueceeaeeeaees 47 D3 Default alarmi Sounds ro p E se Seeds cages cua ceased sostiecs ve cenie EEEE ys suadeede costs a 48 DA Other alarti sounds evitan iran nina ee naa a aterra abia 48 ETSI 5 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex E informative A seesesescesoascsesesessecesonsesenns 49 j e EIKO D A RN 50 ETSI 6 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been d
17. 3444332 Waiting for coast stn 6 00 Since 8 07 Distress from 343444332 acked Distress from 343444332 acked Ex ampl e windows of the Since 0 02 Coast stn replied 0 23 received distress automated mo Info procedure NOTE This alarm self terminates in one second After this the option shall disappear The above examples are only examples They show one means of providing the minimum required information The layout method and choice of text are up to the manufacturer ETSI 27 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 5 4 Handling received DSC Messages DSC messages pertinent to the station but not the procedure shall be allocated to the appropriate automated procedure or initiate their own automated procedure on hold DSC messages that are pertinent to the procedure are all DSC messages concerning the same distress event If the MMSI is unknown DSC messages that are pertinent to the procedure are all DSC messages that have the same distress information nature of distress and subsequent communication allow updated position and time However individually addressed DSC messages shall initiate their own automated procedures on hold if engaged in a received distress procedure handling multi station for example all ships area addressed DSC messages or vice versa 6 5 5 Alarms In a given procedure only the reception of the initial DSC message and the DSC message that first acknowledges the procedure shall sound an ala
18. Draft ETSI EN 300 338 2 V1 3 1 2008 12 European Standard Telecommunications series Electromagnetic compatibility and Radio spectrum Matters ERM Technical characteristics and methods of measurement for equipment for generation transmission and reception of Digital Selective Calling DSC in the maritime MF MF HF and or VHF mobile service Part 2 Class A B DSC SCD 2 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Reference REN ERM TG26 066 2 Keywords maritime radio GMDSS DSC ETSI 650 Route des Lucioles F 06921 Sophia Antipolis Cedex FRANCE Tel 33 4 92 94 4200 Fax 33 4 93 65 47 16 Siret N 348 623 562 00017 NAF 742 C Association a but non lucratif enregistr e a la Sous Pr fecture de Grasse 06 N 7803 88 Important notice Individual copies of the present document can be downloaded from http www etsi org The present document may be made available in more than one electronic version or in print In any case of existing or perceived difference in contents between such versions the reference version is the Portable Document Format PDF In case of dispute the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat Users of the present document should be aware that the document may be subject to revision or change of status Information on the current status of this and other ETSI documents is available at http portal etsi or
19. SC messages pertinent to the procedure allocating all DSC messages pertinent to the station but not the procedure to their own procedures or initiating their own procedure on HF keeping track of the frequencies of reception on HF appropriate tuning to the frequency and mode of subsequent communication and providing at least a 10 s warning if that tuning involves a change from the current tuning and the option to pause the tuning on HF scanning all 6 distress frequencies watching for the distress event acknowledgement or recognizing the self cancel providing the operator with the option to 1 send a relay 2 send a distress acknowledgement when and if a distress alert has been received 3 send a distress relay acknowledgement when and if a distress relay has been received 4 on HF to change the frequency of subsequent communication 5 ability to activate or place the procedure on hold 6 end the procedure Display During the received distress automated procedure the radio shall display or make available to the operator the following items and or information a b c d e f g h i j k the fact one is engaged in receiving a distress the elapsed time since the procedure started prior to acknowledgment the elapsed time since acknowledgement after acknowledgment indicate whether the procedure is on hold or is active the latest distress information MMSI of vessel in distress nature of
20. The second figure shows the window after the alert attempt has completed The procedure is waiting for a distress alert acknowledgement and the radio is tuned for distress traffic on channel 16 The operator has several options to cancel the alert resend the alert before the auto resend timeout pause the countdown to the auto resending and to look at detailed information about the sent alert The info must contain at minimum the distress information Note there is no option to abort the alert the operator must go through the cancel procedure The third figure is four minutes later There may have been voice traffic but no authority has acknowledged the alert The next figure is two seconds later and now the EUT is warning the operator that the distress alert will be automatically resent in 9 seconds The operator could press the pause button to stop the countdown perhaps there is voice traffic at which time the button would say resume or something like that The fifth figure shows the retransmission of the alert and the sixth figure a short time later after the transmission has finished Note the different time to the auto resend in the fifth figure In the seventh figure the distress alert acknowledgement has been received An alarm would sound that needs manual termination and the text bar indicating the alarm information would likely flash or provide some other visual alarm signal The eighth figure shows the acknowledged procedure Note the op
21. all be such that the operator needs no user manual to initiate the desired DSC message b it shall require a maximum of two keystrokes button pushes or menu actions plus the entry or selection of a destination MMSI for the operator to send the default routine individual DSC message from standby ETSI 13 Draft ETSI EN 300 338 2 V1 3 1 2008 12 c parameter descriptions and terms shall be provided in plain language d all parameters of the DSC message that do not require an operator choice shall be entered automatically e guidance and or prompting shall be provided for the entry of any necessary parameters of the DSC message if these parameters and or their values are not plainly visible from context or on the display For data entry a the equipment shall only allow the operator to compose and send DSC messages that are compliant with the latest version of ITU R recommendation M 493 12 3 b acknowledgements shall be automatically composed by the equipment and user options for these acknowledgements are provided by the automated procedures c the equipment shall provide the operator with the choice of specifying the geographic area parameters as either a circle of radius r about a centre point or the traditional latitude longitude Mercator box and northwest corner point or about a centre point d the equipment shall convert and round the radius centre point entry according to the algorithm given in annex B e the equipm
22. alls and routine acknowledgement calls Safety calls and safety acknowledgement calls Warnings Discrete alarms Self terminating alarms Alarms may be repeated as long as it is pertinent to the procedure and awaiting user interaction unhandled It is recommended the alarms are selected within an audible frequency range of 300 Hz to 3 300 kHz The manufacturer is encouraged to implement an option to disable alarms except from those defined in table D 2 ETSI 49 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex E informative Bibliography ETSITR 100 028 1 2001 Electromagnetic compatibility and Radio spectrum Matters ERM Uncertainties in the measurement of mobile radio equipment characteristics Part 1 IEC 60529 ed 2 1 2001 Degrees of protection provided by enclosures IP Code ISO Standard 3791 Office machines and data processing equipment Keyboard layouts for numeric applications ITU R Recommendation M 541 9 2004 Operational procedures for the use of digital selective calling DSC equipment in the maritime mobile service ITU R Recommendation M 689 2 1994 Operational procedures for an international maritime VHF radiotelephone system with automatic facilities based on DSC signalling format ITU R Recommendation M 1082 1 1997 International maritime MF HF radiotelephone system with automatic facilities based on DSC signalling format ITU R Recommendation SM 332 4 1978 Sel
23. alues are approximate average times for HF and VHF DSC messages respectively For all other DSC messages the equipment shall wait for the channel to become free and then the equipment shall delay transmission of the DSC message for a specified wait time The specified wait time shall depend upon the message type and priority Distress DSC messages except for alerts urgency safety routine and test DSC messages shall wait one two three and four fixed units of time plus a random addition described below respectively before attempting to transmit Transmission occurs if and only if the channel is still free after this wait time has elapsed otherwise the process is repeated The fixed unit of time shall be 100 ms on MF and HF and 50 ms on VHF The randomly generated component shall be some positive integer with resolution in milliseconds between zero and the fixed interval The random component serves as a tie breaker when multiple DSC messages of the same priority and type are waiting to be transmitted The randomly generated part of the wait time shall be recomputed for every transmission attempt ETSI 14 Draft ETSI EN 300 338 2 V1 3 1 2008 12 For example on HF the random interval would be some positive integer of milliseconds between 0 ms and 100 ms for example 56 ms Thus the wait time for a routine DSC message in this example would be 456 ms the first attempt If the channel was once again busy after the wait time expired the
24. annot guarantee their long term validity ETSI 8 Draft ETSI EN 300 338 2 V1 3 1 2008 12 2 1 Normative references The following referenced documents are indispensable for the application of the present document For dated references only the edition cited applies For non specific references the latest edition of the referenced document including any amendments applies 1 International Convention for the Safety of Life at Sea 1974 as amended 2 ITU Radio Regulations 2008 3 ITU R Recommendation M 493 12 Digital selective calling system for use in the maritime mobile service 2 2 Informative references The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area For non specific references the latest version of the referenced document including any amendments applies 1 1 IMO Regulation IV 14 regulation X 3 IV 6 6 IMO resolution MSC 97 73 14 6 4 i 2 ETSI EN 300 338 1 Electromagnetic compatibility and Radio spectrum Matters ERM Technical characteristics and methods of measurement for equipment for generation transmission and reception of Digital Selective Calling DSC in the maritime MF MF HF and or VHF mobile service Part 1 Common requirements 3 Definitions and abbreviations 3 1 Definitions For the purposes of the present document the following terms and definitions apply acknowledged autom
25. ated procedure it indicates that the objective of the initial DSC message has been achieved active automated procedure which has control of the general receiver and transmitter and is thus able to engage in subsequent communications and receive DSC messages on both the watch receiver and general receiver automated procedure set of actions necessary to complete the objective of an initiating DSC message or non DSC communication event NOTE 1 Four DSC automated procedures are designed to process these They are the receiving of distress DSC messages the receiving of non distress DSC messages the sending of distress DSC alert attempts and the sending of non distress DSC messages In addition a fifth procedure is designed to handle non DSC communication events NOTE 2 These automated procedures are called 7 Received distress automated procedure 7 Sending distress automated procedure 7 Received non distress automated procedure z Sending non distress automated procedure 7 Communications automated procedure ETSI 9 Draft ETSI EN 300 338 2 V1 3 1 2008 12 critical errors set of information characters obtained from one or more received DSC messages is considered to have critical errors if the automated procedure needs information characters from that set in order to proceed or perform any task but the required information characters are in error EXAMPLE An acknowledgement cannot be composed to an individual DSC message that has err
26. call from 699343444 Rx group call from 699343444 manufacturer chooses to handle the Reply Any key stops alarm Calling 555444322 browsing of the multiple procedures is not specified by this test standard Rx Distress from 222333121 Rx Distress from 222333121 Talking on channel 72 Talking on channel 72 NOTE The manufacturer has in this example provided the hold function separately allowing the user to view an inactive procedure without putting the current active procedure on hold ETSI 41 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex A normative DSC Message Composition A 1 Default values When default parameters are necessary the factory default values shall be as shown in figure A 1 Loading DSC Defaults Is the fora Controller sets Individual see note 1 editable No SSS Controller sets MMSI or group MMSI to an invalid indicator OR controller sets area to 500 nm centered on ship telecommand editable Controller sets Radio telephone see note 1 Is the category editable Controller sets Routine or Safety see note 2 Is the comms chan editable Controller sets a non distress channel see note 1 Is the DSC chan editable Controller sets freq to 2 MHz band see note 1 No All other parameters are never editable NOTE 1 Only if the parameter has not already been set by the operator NOTE 2 The default is routine if allowed it is not allow
27. cy note 1 message Individual Safety General priority Area note 2 Phone HF NBDP Comms freq note 5 f urgency All ships note 3 Individual routine Individual Routine Phone HF NBDP Comms freq note 5 Group DSC Group Routine Phone HF NBDP Comms freq note 5 Position request Individual Safety Position request No info Test Individual Safety Test No info ae eae paola Urgency Phone HF NBDP Comms freq note 5 Neutral Craft note 4 nine cies Urgency Phone HF NBDP Comms freq note 5 NOTE 1 The ability to enter select an appropriate address for the individual area and group formats is also necessary NOTE 2 MEF HF only NOTE 3 VHF only NOTE 4 The Medical Transport and Neutral Craft DSC messages shall only be available as a setup option In the factory defaults these DSC messages shall not be available NOTE 5 On MF HF the communications options are the duplex and simplex radio phone and NBDP channels frequencies On VHF the communication options are the voice channels 1 to 28 and 60 to 86 excluding 70 75 and 76 A broadcast option is also permissible For individually addressed DSC messages there is also the option of letting the other station decide When directed to a coast station the radio shall let the coast station decide the working frequencies On MF HF the ship station shall provide position information in place of the frequency message On VHF the ship station may put the no information characters
28. d and Non Automated Procedure Requirements in Class A B DSC Equipment 6 1 Introduction This clause covers the minimum level of software automation operational simplicity and interface consistency requirements for shipborne fixed installations using class A B Digital Selective Calling equipment as specified in ITU R Recommendation M 493 12 3 annexes 1 3 and 4 Perhaps the most important issue concerns an implied expectation for the use of the terminology automated procedure as used in the present document to appear in the user interface The terminology automated procedure describes the set of algorithms that are used to encapsulate all the activities necessary to perform multitasking DSC and non DSC communication events The operator does not need to know anything about the existence of automated procedures in order to operate a radio that makes use of these algorithms Though the present document refers to items such as the Sending Distress Automated Procedure such language shall not appear on the user interface of the equipment The primary purpose of DSC signalling is to provide the means to set up subsequent communications between vessels and or coast stations A call may be considered as being the total duration from the start of the DSC signalling until the end of the subsequent communications and the automated procedure is terminated The operational functionality described in this part has the objective of not disturbing any ongo
29. distress position time of position comms the type alert relay alert acknowledgement relay acknowledgement sender and intended destination individual area all ships of the latest received DSC message at least a 10 seconds warning before any automated change in communications frequencies are invoked in case engaged in traffic the frequency of subsequent communication HF only the frequencies on which the DSC messages have been received HF only displaying the valid user options the ability to display information about the history of at least the received DSC messages pertinent to the procedure ETSI 26 Draft ETSI EN 300 338 2 V1 3 1 2008 12 1 and the sub stages of the procedure which are 1 waiting to send acknowledgement 2 transmitting 3 waiting for acknowledgement 4 cancelled 5 acknowledged 6 waiting for a free channel At top level the elapsed time the stage of the automated procedure and operator options shall be displayed 6 5 3 1 Examples of received distress procedure displays on VHF equipment In the following set of figures examples are shown of windows that could appear on a display screen during a received distress automated procedure at various stages during the event The first figure show the reception of the distress alert where the operator must silence the two tone alarm The display concerning the alarm text should also be flashing or providing some type of visual alarm The sec
30. dure previous to the procedure being acknowledged 1 2 3 4 5 6 7 8 on HF the setting of the watch receiver to scan all six distress frequencies if not already doing so the transmission of the alert attempt calculating the time to an automated resending of the attempt random between 3 5 min and 4 5 min tuning to the subsequent communication frequency upon conclusion of the attempt waiting for the reception of a distress alert acknowledgement logging all other received DSC messages assuring they do not disrupt the procedure retransmission of the alert attempt occurs after the calculated resend timer expires 3 providing the valid operator options which are i pausing the countdown to automated resending ii resending the alert attempt with the last entered other parameters using the dedicated DISTRESS button iii cancelling the alert attempt iv selecting amongst the six frequencies of subsequent communications HF only after reception of the acknowledgement 1 2 3 4 stopping the automatic resending of the alert attempt transmitting any remaining single alert of the attempt to completion allocating received DSC messages not pertinent to the procedure to their appropriate automated procedures or initiating its own procedure on hold and providing the valid operator options which are i selecting amongst the six frequencies of subsequent communications HF only ii activate or
31. dure shall be considered acknowledged upon reception of the first distress alert acknowledgement concerning the same distress event 6 4 13 Termination Prior to acknowledgement the procedure can not be terminated either by the operator or the equipment it may only be cancelled by an operator initiative After acknowledgment the procedure is terminated manually or by an imposed automatic timeout not required However if such an automatic timeout is provided at least ten seconds prior to termination a visual and aural warning that automatic termination is about to occur shall be displayed with the option to stop the termination 6 4 14 Warnings The procedure shall provide warnings for those reasons provided in ITU R Recommendation M 493 12 3 annex 4 The operator shall have the option to go back to the stage of the procedure where the action was taken that caused the warning ETSI 23 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 5 Receiving distress automated procedure 6 5 1 Procedure The receiving distress automated procedure is initiated either by the reception of the first multi station distress DSC message of a distress event the reception of the first individually addressed distress DSC message of a distress event or the sending of a DROBOSE An informative schematic of the outline of the automated procedure is given in figure 2 ETSI 24 Draft ETSI EN 300 338 2 V1 3 1 2008 12 INCOMING DSC Same event Y
32. e allocating any received DSC message not pertinent to the procedure to the appropriate procedure or initiating their own procedure on hold and providing the valid operator options which are i resend the initial DSC message if it requires no acknowledgement ii activate or place the procedure on hold iii terminate the procedure Display During the sending non distress automated procedure the radio shall display or make available to the operator the following items and or information a b c d e g the fact one is engaged in sending a non distress DSC message the elapsed time since sending the initial DSC message prior to acknowledgement or the elapsed time since being acknowledged once acknowledged or considered acknowledged the information content of the initial DSC message sent which is 1 2 3 4 5 6 7 the type of DSC message description the priority of the DSC message the destination the means of subsequent communication or purpose the frequencies of subsequent communication if any on HF the frequency of the sent DSC message whether or not the DSC message requires an acknowledgement if acknowledged the information content of the acknowledgement which is 1 2 3 4 5 6 7 8 the type of acknowledgment description the priority of the DSC acknowledgement the sender to whom the DSC acknowledgement was sent the means of subsequent communication o
33. e equipment shall either be capable of receiving DSC messages on all distress frequencies except for the transmit frequency in use whilst the distress alert is being transmitted or be able to complete the multi frequency distress alert attempt within one minute 5 1 2 Watch receiver capabilities VHF The watchkeeping receiver part of the DSC equipment shall be designed for continuous operation on channel 70 but the receiver need not operate when the transmitter is in use on that channel 5 2 Remote alarms The equipment shall be provided with facilities for connecting remote alarms as recommended in IMO Regulation IV 14 regulation X 3 IV 6 6 IMO resolution MSC 97 73 14 6 4 1 1 5 3 Galvanic isolation No exposed metallic part of the equipment shall cause any terminal of the source of electrical energy to be earthed 5 4 Manuals Maintenance or service manuals shall be available and shall contain If the equipment is so constructed that fault diagnosis and repair is practicable down to component level the maintenance instructions shall include full circuit diagrams component layouts and components parts lists ETSI 12 Draft ETSI EN 300 338 2 V1 3 1 2008 12 If the equipment contains modules in which fault diagnosis and repair down to component level is not practicable the maintenance instructions shall contain sufficient information to enable localization and replacement of the defective module 6 Automate
34. e sending distress automated procedure results when the operator presses the dedicated distress button to send a distress alert attempt An informative schematic of the outline of the automated procedure is given in figure 1 ETSI 16 Draft ETSI EN 300 338 2 V1 3 1 2008 12 PUSH DISTRESS BUTTON Distress Button Sub Procedure End No procedure Completed Yes Transmission Sub Procedure with updated position and time of position and default or optional entered distress information Compute time to next attempt Tune radio to comms freq Options Pause countdown Resend attempt Change attempt HF Pick comms freq HF Cancel Procedure Enter acked stage and Yes Y Received DSC sound ack alarm al log DSC No Time to next attempt Ack received and attempt stopped Received DSC Inform Repeat ack allocate multi from same station Options station relays may End procedure be ignored Pick comms hold activate End procedure Short alarm Figure 1 Sending distress procedure ETSI 6 4 2 17 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Tasks The radio shall follow the sending distress automated procedure as shown in figure 1 complying with the automated procedures as defined in ITU R Recommendation M 493 12 3 annex 4 The sending distress automated procedure shall handle the following events a b c 6 4 3 the distress button sub proce
35. eclared to ETSI The information pertaining to these essential IPRs if any is publicly available for ETSI members and non members and can be found in ETSI SR 000 314 Intellectual Property Rights IPRs Essential or potentially Essential IPRs notified to ETSI in respect of ETSI standards which is available from the ETSI Secretariat Latest updates are available on the ETSI Web server http webapp etsi org IPR home asp Pursuant to the ETSI IPR Policy no investigation including IPR searches has been carried out by ETSI No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 or the updates on the ETSI Web server which are or may be or may become essential to the present document Foreword This European Standard Telecommunications series has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters ERM and is now submitted f for the Public Enquiry phase of the ETSI standards Two step Approval Procedure The present document is part 2 of a multi part deliverable Full details of the entire series can be found in part 1 1 2 Proposed national transposition dates Date of latest announcement of this EN doa 3 months after ETSI publication Date of latest publication of new National Standard or endorsement of this EN dop e 6 months after doa Date of withdrawal of any conflicting National Standard dow 6 months after doa ETSI 7 D
36. ectivity of receivers ITU T Recommendation E 161 2001 Arrangement of digits letters and symbols on telephones and other devices that can be used for gaining access to a telephone network ITU T Recommendation V 11 1996 Electrical characteristics for balanced double current interchange circuits operating at data signalling rates up to 10 Mbit s IEC 61162 1 2000 Maritime navigation and radio communication equipment and systems Digital interfaces Part 1 Single talker and multiple listeners ITU R Recommendation M 821 1 1997 Optional expansion of the digital selective calling system for use in the maritime mobile service ITU R recommendation M 1080 1994 Digital Selective Calling system enhancement for multiple equipment installations IMO Circular MSC Circ 803 Participation of non SOLAS ships in the Global Maritime Distress and Safety System GMDSS ETSI 50 Draft ETSI EN 300 338 2 V1 3 1 2008 12 History Document history November 1995 Publication as ETS 300 338 v1 2 1 April 1999 Publication as EN 300338 V1 3 1 December 2008 Public Enquiry PE 20090405 2008 12 06 to 2009 04 06 ETSI
37. ed for area or all ships messages otherwise the default is safety This default is to be reset the most recently entered value shall be overwritten when the operator selects the option to compose a non distress DSC message at some later time Figure A 1 Loading DSC defaults ETSI 42 Draft ETSI EN 300 338 2 V1 3 1 2008 12 A 2 The default DROBOSE Table A 1 Default DROBOSE vessel in Format Nature Distress position UTC time of distress MMSI see note comms position unknown Individual Undesignated Phone unknown unknown NOTE The destination MMSI shall be some invalid indicator The MMSI of the vessel in distress format nature and position shall be reset when the operator selects the option to compose the DROBOSE at some later time A 3 Allowable non distress DSC message parameters The radio shall provide the operator only with the ability to send non distress DSC messages with the parameter combinations as given by table 4 in the latest ITU R recommendation M 493 12 3 For convenience the allowable parameter combinations for the various message types for non distress DSC messages are summarized in table A 2 Parameters in bold type are fixed for that DSC message type and when composing that message type the fixed parameters shall not be able to be edited by the operator Table A 2 Allowable parameter combinations Message type Format Category Telecommand Frequen
38. edure can be terminated manually or by the automated timeout At least ten seconds prior to automated termination a visual and discrete aural warning shall be displayed with the option to stop the automatic termination If the procedure is terminated manually by the user then integrated equipment may revert to the channel or frequency that was previously selected before the DSC procedure 6 5 11 Warnings The procedure shall provide warnings for those reasons provided in ITU R Recommendation M 493 12 3 annex 4 The operator shall have the option to go back to the stage of the procedure where the action was taken that caused the warning 6 6 Sending non distress automated procedure 6 6 1 Procedure The sending non distress automated procedure results when the operator selects to transmit a DSC message that does not contain the distress information It also results when an acknowledgement to a sending non distress automated procedure that has been prematurely terminated is received an acknowledgement one quit waiting for An informative schematic of the outline of the automated procedure is given in figure 3 ETSI 29 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Select to Send DSC Message Transmit DSC message Enter acked stage Tune radio for comms or display information Sound No Acked XES ack alarm allocate DSC message Present Options Resend DSC unless ack received On hold activate End Procedure
39. ent shall provide an automatic determination of the channel and or frequencies of subsequent communication according to the algorithm given in ITU R Recommendation M 493 12 3 annex 3 and summarized in annex C The automated channel selection shall be able to be overridden It shall not be possible to select a distress channel for subsequent communications for DSC messages of priority routine The equipment shall automatically set the dot pattern length to 20 bits for all transmitted DSC messages on VHF and on MF HF all DSC messages addressed to a coast station and all individual acknowledgements with format specifiers 120 and 123 Furthermore MF HF equipment shall automatically set the dot pattern length to 200 bits for all transmitted DSC messages for distress alerts distress acknowledgements distress relays addressed to a geographic area distress relay acknowledgements addressed to all ships all calls addressed to a ship station other than messages addressed to a coast station or all individual acknowledgements with format specifiers 120 and 123 6 2 2 Transmission of DSC messages and prioritized wait If the channel is free after the transmitter has powered up the transmission shall begin immediately If the channel is not free and the DSC message is a distress alert the alert shall be transmitted as soon as the channel becomes free or after 10 s on MF or HF or 1 s on VHF which ever occurs first The 10 s and 1 s v
40. equent acknowledgements from the same source demanding changes in subsequent communication frequencies shall occur automatically Subsequent acknowledgments from a different source shall indicate to the operator by some means that a change in frequency is requested however in the absence of any operator action the tuning shall not occur 6 4 11 Cancelling the Distress Alert The distress cancel procedure consists of the cancel operation on all bands utilized by the distress alert attempts on VHF and MF there is only one cancel operation whereas on MF HF there may be up to six The cancel operation consists of a DSC cancel a self addressed distress alert acknowledgement followed by a voice cancel on the corresponding frequency of subsequent communication The phrase voice cancel refers to the part of the cancel done over the subsequent communication frequencies whether it is by radio telephony or on MF and MF HF by data Cancellation of a distress alert shall only be possible prior to acknowledgement Selection of the cancellation option during the sending of a distress alert attempt shall stop the transmission as soon as possible but only after any ongoing distress alert within the distress alert attempt is completed Upon selection of the cancel option the equipment should provide an explanation of the cancel procedure and for HF the frequencies requiring cancellation shall be indicated to the operator The radio shall prompt the operato
41. erator options have changed and the procedure is still tuned for distress traffic At this point the DSC phase has accomplished its purpose and linked the vessel in distress to assistance authorities Until the procedure is terminated the procedure remains DISTRESS Undesignated DISTRESS Undesignated DISTRESS Undesignated Waiting for reply 2 09 Waiting for reply 6 09 DISTRESS Undesignated DISTRESS Undesignated DISTRESS Undesignated 11 9 seconds to auto resend Transmitting alert Waiting for reply 6 54 Time to auto resend 0 09 Time to auto resend 3 39 Time to auto resend 3 05 Our DISTRESS acknowledged Our DISTRESS acknowledged 3 S ao Example windows of the Reply ba sending distress automated procedure at various stages The above examples are only examples They show one means of providing the minimum required information The layout method and choice of text are up to the manufacturer ETSI 6 4 4 19 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Dedicated distress button sub procedure The dedicated distress button shall be used for the following purposes in the following manner a b c d use of the dedicated distress button is required to initiate the sending distress automated procedure the dedicated distress button shall be used exclusively for initiating the sending distress automated procedure use of the dedicated distress button after entering parameters of the aler
42. es Multi indiv different Allocate DSC First of type lt 500 nm polar Yes Sound manual silence only alarm Sound self terminating alarm Allocate DSC Get RX frequency of DSC Compute comms frequency Yes Option in 10 s for Operator to block automatic frequency change on HF Auto change Distress alert Previous alert different freq in 60 s Multi frequency 8 MHz comms User choice was to keep frequency Not acked stage or Rec DSC is first ack Keep frequency Multi station options only Send relay Send distress acknowledge if distress received Y Yes Individual options only Send Ack Set acked stage o Me O distress relay received Common options Activate or place on hold End procedure Change comms freq on HE End Procedure Send DROBOSE Figure 2 Receiving distress procedure Rec DSC an ack Multi indiv different Allocate DSC Send Distress relay ETSI 6 5 2 25 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Tasks The radio shall follow the received distress automated procedure as shown in figure 2 complying with the automated procedures as defined in ITU R Recommendation M 493 12 3 annex 4 The received distress automated procedure shall handle the following events a b c d e f g 6 5 3 the sounding of the appropriate alarms for D
43. f communications automated procedures to some value in the range 10 s to 10 min set 30 s A record of the DSC activity shall be available containing the following information which shall be able to be displayed a the UTC time and date of reception b on MF HF the frequency of reception c the information content of the DSC message d a minimum of the twenty most recently received distress DSC messages a single or multi frequency alert attempt shall be recorded as a single DSC message with an indication of how many of the alerts in the attempt were received DSC alerts received on the same frequency within a period of 60 s MF HF and 5 s VHF shall be considered part of the same distress alert attempt On MF HF consecutive alerts received on different frequencies within a period of 60 s shall be considered a multi frequency attempt In both cases the information characters assimilated by the automated procedure handling the distress alerts shall be the recorded information characters In other words if any errors in the information characters of a received alert are corrected by the reception of other alerts within the attempt only the corrected version shall be recorded e a minimum of the twenty most recently sent DSC messages where a distress alert attempt is recorded as a single message f a minimum of the twenty most recently received non distress DSC messages 6 4 Sending distress automated procedure 6 4 1 Procedure Th
44. g tb status status asp If you find errors in the present document please send your comment to one of the following services http portal etsi org chaircor ETSI_support asp Copyright Notification No part may be reproduced except as authorized by written permission The copyright and the foregoing restriction extend to reproduction in all media O European Telecommunications Standards Institute 2008 All rights reserved DECT PLUGTESTS UMTS TIPHON the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members 3GPP is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners ETSI 3 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Contents Intellectual Property Risa A seer 6 A OO 6 1 SCOPE cisri A cl ai ia 7 2 A O AN 7 2 1 Normative te terencesi ee Ah Rainn eee ei ee a ini eee 8 2 2 Informative references ois ies ae erie ee hoe eer a he ei bes 8 3 Definitions and abbreviations usais ii EEE 8 3 1 Definitions uan nata 8 3 2 RN 10 4 Controls and Indicators in Class A B DSC EquipMeNt ooooconccnnocnnocononnnonnnnnncnnncnnnonn nono nono nocnnccnnncnnccnnncnnnos 11 4 1 MiStiall indicat ci 11 5 Technical requirements iii tail tilo ia 11 5 1 Facilities for DSC transmission and reception ee eceeceeceeecesecesecesecaecsaecaeecseseseseaeeseeseesseseeeeereerenseessaes 11 5 1 1 Multi frequency distress alert attempts and watch receiver capabili
45. he final southern extent of the Mercator box via either entry method exceeds 90 S the latitude height shall be truncated so that it reaches 90 S If the final longitudinal dimension exceeds 99 the dimension shall be truncated to 99 If the final latitudinal dimension exceeds 99 the dimension shall be truncated to 99 ETSI 45 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex C normative Automated Non Distress Channel Frequency Selection Algorithm Automated subsequent communications channel selection provides a default channel for the operator for non distress DSC messages requiring subsequent communications based upon a simple algorithm It shall be applied in the absence of any other specialized means of an automated communication setup such as HF Automatic Linking Exchange ALE C 1 a b c d C 2 VHF Channel 16 shall not be used as a default for routine category DSC messages If the DSC message is directed toward ship stations a simplex channel shall be used for example channel 6 DSC messages directed toward a coast station shall let the coast station decide position or all 126 s in the frequency parameters of the DSC message Any automatically proposed channel or list of channels may be established as an operator or configuration option HF On HF one has several bands of simplex and duplex frequencies for both voice or analogue signals 3 000 Hz bandwidth and data signals 500 Hz bandwidth
46. hold and there are automated procedures handling test polling or position requests and these procedures are setup to auto acknowledge the equipment shall successively perform the auto acknowledgement and terminate these procedures ETSI 39 Draft ETSI EN 300 338 2 V1 3 1 2008 12 The radio shall provide sufficient memory or capacity to be able to handle a minimum of seven simultaneous automated procedures including a reserve of one If the equipment can handle more than the required minimum the equipment shall provide a setup option where the operator can set the value to seven or any other value the equipment is capable of handling This option is only required for equipment that can handle more than the minimum When the equipment maximum is exceeded by one and the reserve procedure is started the equipment shall generate a warning stating that an automated procedure needs to be terminated or equivalent though this new procedure and all the previous automated procedures shall still function normally At this time the operator shall be prevented from starting any automated procedure except for the sending one s own distress If the operator does not elect to terminate an automated procedure the reception of an additional automated procedure shall result in the automatic termination of an existing automated procedure The automatic and immediate termination of an automated procedure should be based upon age and priority NOTE Automated pr
47. ication of whether the procedure is on hold or is active c the frequencies and or channels of communication only applies for non integrated DSC equipment d the operator options e the station MMSI f the latest known position of the vessel and the origin of the position manual automatic etc g the UTC time of that position 6 8 4 Handling received DSC Messages All received DSC messages pertinent to the station shall be allocated to the appropriate automated procedure or initiate their own automated procedure on hold ETSI 38 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 8 5 Tuning of the general receiver and transmitter The procedure shall automatically tune the general receiver and transmitter to the frequencies of the selected channel 6 8 6 Termination The procedure may either be terminated manually or via an automatic timeout 6 9 Multiple automated procedures and parallel event handling 6 9 1 Procedure This clause describes the handling of received DSC messages that are pertinent to the station while the radio is engaged 6 9 2 Tasks Tf the radio is engaged in handling an automated procedure except for an unacknowledged sending distress automated procedure received DSC messages that are pertinent to the station but not the currently active automated procedure a are allocated to an existing automated procedure on hold or b shall initiate their own automated procedure on hold Only one automated pr
48. ications and on HF the reception of DSC acknowledgements on the duplex DSC channels NOTE Itis important to distinguish this unit from the watch receiver Information characters set of symbols in a DSC message that contains the items of interest for the recipient and is used to compute the ECC symbol that terminates the message NOTE These symbols are repeated in the DX RX time diversity pattern initial DSC message DSC message that starts an automated procedure non distress DSC message DSC messages or acknowledgments that do not have the format specifier or category of distress objective when in reference to a DSC message or automated procedure the goal or intent of the item NOTE Usually this goal or intent is to establish subsequent communications or request information on hold automated procedure which does not have access to the transmitter and general receiver and therefore cannot engage in subsequent communications and is only able to receive DSC messages on the watch receiver operator options any choices the operator can make while the automated procedure is engaged parallel event handling background process of handling a received DSC message that is not pertinent to the active automated procedure pertinent to the automated procedure expression used primarily with reference to DSC messages to indicate that the message has something to do with the procedure and is therefore handled by the procedure NOTE A DSC message
49. in the frequency message ETSI 43 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Annex B normative Radius Centre point conversion and rounding algorithm B 1 Radius centre point conversion The Mercator box specification coded into the DSC message shall be the minimum sized box that encompasses the entire circle as illustrated in figure B 1 33 S 63 W 66W i no tt 6 lon 3 12 sheath ona a bop Tits 1 36 lon X lat lon box before rounding lt 9 lon 4 _ gt Figure B 1 Circle radius to lat lon box The centre point radius to northwest corner point latitude longitude Mercator box conversion shall take the following steps The situation shown in figure B 1 a radius of 80 nautical miles cantered on the point 33 9 S 61 10 W is used as an example in the conversion algorithm below as an illustration a b c d e Define the centre point as given by the latitude longitude point 60 A 33 9 S 61 10 W The radius shall be converted to units of latitude 80 nautical miles 1 20 latitude The equivalent value in units of longitude shall be given by y cos6 where 6 is the latitude of the centre point 1 36 longitude 1 20 latitude cos 33 9 If the longitude exceeds 49 00 the longitude shall be truncated to that value since the maximum box width in the DSC sentence is 99 The dimensions of the Mercator box before rounding shall be gi
50. ing call Furthermore the equipment shall assist the operator by providing simple audible indication of a received DSC call whilst the equipment is engaged and provide a facility to manage activation amongst initiated automated procedures 6 2 Non automated features This clause describes the features of the equipment that are necessary to assure compliance to the ITU R DSC functionality standards and support a smoother operation of the automation algorithms but are not directly related to the automation algorithms 6 2 1 DSC Message Composition The equipment shall provide factory default values for all non distress DSC messages as specified in ITU R Recommendation M 493 12 3 annex 3 and summarized in figure A 1 for all parameters where the operator has the option to select or enter more than one value and has not already done so The default values for the Distress Relay On Behalf Of Someone Else DROBOSE shall be as given in table A 1 The default values for the operator composed distress alert shall be the default distress alert as specified in the sent distress automated procedure A destination MMST that does not have at least 9 digits entered is invalid The MMSI unknown indicator shall only be able to be used for the MMSI of the vessel in distress when composing a DROBOSE No DSC message shall be able to be sent that has an invalid parameter For simplicity of the user interface a the DSC message composition interface sh
51. istress alert has been transmitted on each of the frequencies in the list There shall be no more than a three second delay between transmissions of each alert in the multi frequency attempt f the transmission starts on the appropriate frequency g the countdown to the next automated resending of the attempt is started h ifa distress acknowledgement is received the attempt shall cease after completion of any ongoing distress alert within the attempt i ifa single frequency attempt five alerts shall be sent without a break between alerts j ifa single frequency attempt the extended position information shall be sent on only the 5h alert k ifa multi frequency attempt the extended position information shall be sent on each alert 6 4 6 Updating position When a distress alert attempt is resent it shall update the position and UTC time of position information 6 4 7 Handling received DSC Messages Prior to acknowledgment of the sending distress automated procedure only the distress acknowledgement describing the same distress event is pertinent to the procedure All other DSC messages shall be ignored and only recorded in the log After the sending distress automated procedure has been acknowledged all DSC messages describing the same distress event are pertinent to the procedure Of these DSC messages all ships group and area distress relays may be ignored DSC messages not pertinent to the procedure shall be allocated to the a
52. istress button is released before the three seconds have elapsed when releasing the button the radio shall return to its previous state when the three seconds have elapsed regardless of whether the button is continued to be held down or released completes ACTION 2 and the alert attempt is started sounding a steady tone of two second duration after ACTION 2 has completed and displaying a visual indication that the distress alert attempt has been sent Transmission of the alert attempt The transmission sub procedure of the sending distress automated procedure shall be as follows a b c d the appropriate frequencies for transmission shall be determined from the selected frequencies on VHF it is always channel 70 and thus always a single frequency attempt on MF it is always 2 187 5 kHz and thus always a single frequency attempt for an HF single frequency attempt a frequency is chosen from a list of six possible frequencies default all six previously set up by the operator during equipment installation Each time the attempt is automatically or manually repeated the next frequency in the list is used until all frequencies are utilized at which time the cycle repeats ETSI 20 Draft ETSI EN 300 338 2 V1 3 1 2008 12 e for an HF multi frequency attempt a list of three to six frequencies 2 MHz and 8 MHz mandatory default all six previously set up by the operator is utilized The multi frequency attempt is completed when a d
53. lay acknowledgment until an individual distress relay request has been received The operator shall not have the option to send a distress alert acknowledgment until a distress alert has been received Once the option to send any of the distress DSC messages distress relay distress alert acknowledgement distress relay acknowledgement referenced above becomes available the options shall remain available until the procedure is terminated The procedure shall automatically compose the distress DSC messages referenced above except a the distress relay where the operator shall have the option to select the addressing mode and address where the default shall be individual and on MF HF the communications mode and b in a procedure handling an individually addressed relay or relay acknowledgement the operator shall have the option to send an all ships relay acknowledgement in addition to the default individual relay acknowledgement even though this DSC message is typically forbidden to be sent by ship stations Note that it is only possible to send an individually addressed distress relay acknowledgement upon reception of an individually addressed relay On HF the operator shall have the option to override the default band of the DSC message and send the distress DSC messages distress relay distress alert acknowledgement distress relay acknowledgement referenced above on any one of the six distress channels 6 5 10 Termination The proc
54. ll and an urgency call Rx Call from 456444322 Rx Call from 456444322 Rx Call from 456444322 Waiting for you to reply 1 44 User receives call Alarm sounds User Waiting for user to reply User presses Procedure indicates VHF is transmitting silences alarm reply button E EA G out 60 E Procedure tunes to channel and indicates User receives group call Alarm sounds Not much to do here Link is one way the link is ready for talk Reply possible User silences alarm Procedure indicates link is ready Rx all stations Urgency call Rx all stations Urgency call RE Channel 9 tuned for broadcast 0 33 Example windows of the received non distress procedures 6 7 4 Handling received DSC messages DSC messages pertinent to the station but not the procedure shall be allocated to the appropriate automated procedure or initiate their own automated procedure on hold DSC messages that are pertinent to the procedure are repeats of the initial DSC message 6 7 5 Alarms When auto acknowledging position poll and test DSC messages no alarm shall sound When auto acknowledging individually addressed DSC messages requesting subsequent communications an alarm shall sound and be terminated as specified in tables D 1 and D 2 but the alarm shall be delayed until after transmission of the acknowledgement When auto acknowledging is not involved an alarm shall sound and be terminated as specified in tables D 1 and D 2
55. m shall increase in volume over the first 10 s The shutdown specifies whether the alarm shall be terminated manually man may be silenced automatically auto or automatically if the situation causing the alarm is corrected corr Manual silencing of alarms is always an option The when aural required column specifies the conditions under which the aural alarm is mandatory It is assumed in the table below that any references to received DSC messages refer only to messages implicitly or explicitly addressed to the station ETSI 47 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Table D 1 Alarm characteristics distress button Event Sound Increase Shutdown When aural is required Initiating a received Only if within 500 nm of the vessel in distress or if distress automated two tone Yes Man from north of 70 N or south of 70 S otherwise procedure note 1 alarm self terminates poe Only if within 500 nm of the vessel in distress or if tomaled procaduis Distress ack No Man from north of 70 N or south of 70 S otherwise note 1 P alarm self terminates Acknowledging a sent distress automated distress ack No Man Always procedure note 1 rx DSC message not e ah A s nt silence Does Not Does Not DSC message is only logged no alarm of any distress automated Apply Apply type is required procedure Prani E ra nevalarm Yes Man Always when the priority of the non distress DSC a e pr
56. n and automatically send the cancel Frequencies that have been cancelled shall be indicated On HF once any single channel is cancelled the operator shall be unable to exit the cancel procedure until all utilized channels have been cancelled Completion of the cancellation shall place the sending distress automated procedure in the acknowledged state The radio shall display to the operator the stages of the cancellation procedure such as waiting for the operator to proceed or equivalent transmitting the DSC cancel or equivalent radio tuned for the voice cancel or equivalent cancel procedure done or equivalent ETSI 22 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 4 11 1 Examples of cancel distress displays on VHF equipment In the following set of figures examples are shown of windows that could appear on a display screen during a sending distress automated procedure when the cancel operation is done The first figure shows the sent distress procedure after the transmission The operator presses the cancel button The second figure shows the warning with the option to continue or to back out The operator chooses to continue The third figure shows the start option which still gives the operator the option to back out The operator selects start The fourth figure shows the DSC phase of the cancel the self addressed distress acknowledgement which lasts only about 0 7 s on VHF The fifth figure shows the start of the voice cancel
57. neutral crafts DSC messages set to off c the option to auto acknowledge polling DSC messages set to on d the option to auto acknowledge test DSC messages set to on e the option to auto acknowledge position request DSC messages set to off f the option to auto acknowledge individually addressed non distress DSC messages set to on see clause 6 7 7 g the option on MF HF equipment to set the maximum distance for sounding a two tone alarm that does not self terminate upon initiation of a received distress automated procedure to some value greater than or equal to 500 nautical miles that includes never self terminate set to 500 nautical miles h the option to set the no activity timeout to exit any non automated procedure activity to some value that includes no timeout set to 10 min ETSI 15 Draft ETSI EN 300 338 2 V1 3 1 2008 12 i the option to set the no activity timeout of non distress DSC automated procedures to some value that includes no timeout set to 15 min j the option to set the no activity timeout of received distress DSC automated procedures to some value that includes no timeout set to no timeout k that there is no option to set any timeout of the unacknowledged sending distress automated procedure 1 the option to set the maximum amount of simultaneous automated procedure applies only to equipment that supports more than the required minimum of seven m the option to set the no activity timeout o
58. new wait time might be 417 ms the second attempt etc 6 2 3 Alarms Alarms shall have both a visual and aural component Any alarm that initiates for the purpose of getting the operator s attention shall provide the reason for and means to terminate the alarm Alarms shall be initiated for the reasons given in table D 1 The means to terminate the alarms are given in table D 1 The two tone and urgency sound alarms shall not be able to be disabled The default aural alarms are given by table D 2 Some alarm tones may be customized by the operator as shown in table D 2 6 3 Standby NOTE Standby is the state of the equipment when it is not engaged in a communications or DSC automated procedure The state of the equipment is considered engaged whether the automated procedure is active or on hold The following functions and or information shall be visible to the operator at top level while in standby a the station MMSI b the latest position of the vessel c the UTC time of that position d the dedicated distress button e aclearly labelled means to compose a distress alert prior to sending distinct from the dedicated distress button f aclearly labelled means to compose send a non distress DSC message g aclearly labelled means to compose send a DROBOSE The following setup options shall be available with the following factory defaults a the option to send medical transport DSC messages set to off b the option to send
59. ng received DSC Messages ooocooccocnoonononconoconoconocnnonononononnnrnn con ncnnn ran nnnn roer nano nn cone cn neon ncnn ne none nn nrnnnrnens 20 6 4 8 AS seeeaatee theca telecon dM Gaeta ee ia eet as ate edn at a a ceed te tice east 20 6 4 9 Determining Subsequent COMMUNICATIONS eee ee eesecetecsee cee cseeeseeeeeeeeeeeeceseesecsaecsaecsaecsaecaeecaeseaeeeneees 20 6 4 10 Automated tuning ree ecb oia A st pte esate diester 20 6 4 11 Cancelling the Distress Alettiin cs nata anotando EA A EEE E STe ETEENI E OTRE a es 21 6 4 11 1 Examples of cancel distress displays on VHF equipMeNt oooonocnnccniccconnconoconocnonnnonnnonnncnnn ran cnnncnnncnnncnnes 22 6 4 12 Acknowledgments nre taste sted eh ee a e orde 22 6 4 13 RETMMMAMONE eects esac MAS ies seek ING a eh ae ee eh eae ol A a ae eed 22 6 4 14 AVALON tota 22 6 5 Receiving distress automated procedure cooocccoccconcnononononnnonnnonn nono conc conc conc cone cone corn on neon nono neon nrnn cnn nnnnnnnn nan cnnecnnes 23 6 5 1 Procede ca dad 23 6 5 2 Task Sueca iia 25 6 5 3 DiS play uta a eneren eE E E E REE EAEE E ae 25 6 5 3 1 Examples of received distress procedure displays on VHF equipe cocooonnncncncononoconcncnancnnnconncnnnonnnonns 26 6 5 4 Handling received DSC Messages ooococccoonoccnoocconnconoconocononnnccnnonnnonnc on nono nono n ron rra nono EEEE EEEE E o Sees 27 6 5 5 ALARMS st ds ae 27 6 5 6 Determining Subsequent COMIMUNICAtIONS oooccnocnccnonnnonnnonoconocnnocnnonnnonn nono no
60. nnnnnnnnnnonnn one none cn nono neon nera corn ncnnnns 27 6 5 7 Automated Inici aiii 27 6 5 8 Acknowledegments oia caia tii 27 6 5 9 Sending Relays and Acknowledgments ooooccconccononononononnnoonnnoncnnncnnccn nono nono nconnc nn nonn nono cnn nrnn nan n cnn crec necnne nns 28 ETSI 4 Draft ETSI EN 300 338 2 V1 3 1 2008 12 6 5 10 TEM a AA A a 28 6 5 11 IA a pe 28 6 6 Sending non distress automated procedure coococcnnccconnconoconoconoconocononononnnnnn nono nnnnonn none cono cn none cone cnn nc rn nena crac crnnenns 28 6 6 1 POC aoe eed ea eh ee Re ede ee 28 6 6 2 TASKS NN 29 6 6 3 DISPO Getta aa a A a ae nos de ee 30 6 6 3 1 Examples of sending non distress procedures displays on VHF equipment ooooccnnccnocnconnconoconoconccnnonnss 31 6 6 4 Handling received DSC Messages eeceecescesecssecssecssecseecseeeeecaaeeseseaeeeeeeesceseeeseesecsaecnaeceaecaaesaeseneeentens 31 6 6 5 AVAL ITS 55 os es Shee ieee Ran Ee Saha Tate Seca ot ETI ee nae San asada wh Dade ee Seb om ede ee 31 6 6 6 Automated tuning 323 is seies late n E A eh ehh eters eh He tee ws Rei ee S 31 6 6 7 Delayed Acknowledgements 0000 0 cece ceseeeseesseeeeeseceecesecaecsaecaeecaeeeseseaeseaeeeeeseensecaecsaecsaecsaecseecaeseaeeeneees 32 6 6 8 Termin tion ON 32 6 6 9 Ward iii ici 32 6 7 Receiving non distress automated procedure ooococcoccconononnonnnonononocnoconocn nono nonnncnnnrnn cnn nnnn canon nn cone cn neon nero nora ncnnnnne 32 6 7 1 O NN 32 6 7 2 Vi oi 33 6 7
61. nt after acknowledgment indicate whether the procedure is on hold or is active at least a 10 s warning before any automated change in communications frequencies are invoked in case engaged in traffic the information content of the received DSC message 1 priority category 2 the sender 3 to whom the DSC message was sent format and MMSI or area 4 means of subsequent communication or the requested or sent information 5 frequencies and mode of subsequent communication if any 6 on HF the frequency of the DSC message 7 whether or not the DSC message requires an acknowledgement the information content of any acknowledgment sent 1 priority 2 the destination ETSI 35 Draft ETSI EN 300 338 2 V1 3 1 2008 12 3 the communication mode and frequencies or unable to comply and reason or info 4 on HF the frequency of the acknowledgment h displaying the valid user options and i the sub stages of the procedure which are 1 waiting to send acknowledgement 2 transmitting 3 acknowledged 4 waiting for a free channel At top level the elapsed time the stage of the automated procedure and operator options shall be displayed 6 7 3 1 Examples of receiving non distress procedures displays on VHF equipment In the following figure is a set of example windows that could appear on a display screen during a received non distress procedure The examples below show windows for a received routine call group ca
62. ocedure can be active at a time since there is only one transmitter and general receiver in addition to the watch receiver thus any action to activate an automated procedure on hold places the currently active automated procedure on hold Automated procedures on hold shall behave identical to active procedures except they do not have control of the transmitter and general receiver thus a the only operator options which are available are those that do not require use of the transmitter or general receiver such as to terminate or activate the automated procedure b any subsequent tunings of the transmitter and general receiver that would occur if the procedure were active upon reception of a DSC message appropriate to the procedure shall not occur until the procedure is activated by the operator c the display of automated procedures on hold may be requested by a simple button press or selection and may be represented by an appropriately named list labelled icons or equivalent in order to minimize space requirements d all other features including handling of the alarms and full display of information at the request of the Operator remain The operator shall be able to activate any displayed automated procedure on hold selected from the list in c by a single action a button press or selection unless the currently active procedure is transmitting If the only remaining automated procedures present on the equipment are inactive or on
63. ocedure gency message is distress note 2 or urgency Prae T an Urgency ack No Man Always when the priority of the non distress DSC st procedure alarm message is distress note 2 or urgency A OS When the priority of the non distress DSC Seite rocediires routine alarm Yes Auto message is safety routine ships business or note 1 P unknown Acknowledging all we s other priority sent non routine ack einen the priority of the nan distress DSC distress automated Alarm No Auto message is safety routine ships business or unknown procedures rx DSC message Self pertinent to an ongoing terminating No Auto Always automated procedure alarm Auto termination of procedures too many Discrete No auto Always procedures No own MMSI Warning No auto Only on equipment power up Automatic positioning Only if configured for auto position updating and ceases Warming NO Mancor info has not been received for 10 minutes AA Arman Warning No man At all times the situation is satisfied ee than Warning No man Only if older than 4 hr alarm has been silenced Fressing the dedicated Count No At all times the situation is satisfied NOTE 1 Only when the event occurs due to the reception of a DSC message NOTE 2 The distress priority has been a source of great confusion It is not a distress alert but a non distress DSC message with the priority distress which is no longer allowed in the latest version ITU R recommendation M 493 12 3 The distress p
64. ocedures handling received Poll position and test calls shall always be the first procedures to terminate regardless of their age 6 9 3 Examples of multiple procedure screens In the following figure is a set of example windows displaying multiple procedures In this case one area of the screen is dedicated to displaying the active procedure and a list of current procedures is navigated by up down arrow keys In the first figure the received distress procedure is shown The procedure is unacknowledged and upon activating this procedure the EUT automatically tunes the subsequent communication channel to 16 The second figure shows the result of pressing the up arrow The received distress procedure goes on hold and our sending non distress procedure becomes active Note that 555444322 has not responded yet The default is for 555444322 to auto acknowledge but it may not happen because 555444322 is out of range or engaged in another communication event and has not gotten around to acknowledging your call The third figure shows the result of pressing the up arrow key one more time The sending non distress procedure goes on hold and the listed received non distress procedure which happens to be a group call becomes active The channel of subsequent communication automatically tunes to channel 6 and one can join in the voice traffic of that group Of course the operator missed any traffic associated with that procedure while the procedure was on hold
65. ond figure shows the procedure after silencing the alarm The procedure indicates that channel 16 is open for traffic and that it is waiting for a distress alert acknowledgement The third figure shows the reception of a distress relay concerning this distress event An alarm sounds but it is self terminating The message must still provide a means to silence it and it must flash or provide some type of visual alarm The operator can press info to view the details of the latest received DSC message pertinent to this event The fourth figure shows the procedure after the alarm terminates The procedure is still waiting for the DSC acknowledgement and is still tuned to channel 16 The fifth figure shows the reception of a repeat distress alert attempt by the vessel in distress This attempt could have happened automatically or been done by the operator on the vessel in distress However this time only the self terminating alarm sounds The sixth figure shows continuation of the procedure after the alarm terminates The seventh figure shows the reception of the distress alert acknowledgement This time the alarm must be manually silenced The eighth figure shows the received distress procedure upon silencing the alarm The DSC phase is done Note that the operator has the option to exit the procedure place it on hold or get further information at any time during the event eee Rx Relay about 343444332 Repeat Distress from 343444332 Repeat Distress from 34
66. ors in the senders MMSI default value selected or an action taken by the equipment software in the absence of any operator input distress alert name given to the single distress DSC message with the format symbol 112 distress alert attempt set of distress alerts sent by a vessel when in distress NOTE A distress alert DSC message by itself is never intentionally sent by a vessel in distress For example the single frequency distress alert attempt consists of five consecutive distress alerts with no break in between each distress alert distress DSC message DSC message or acknowledgement containing the distress information distress event unique distress situation identified by two VHF or three MF HF parameters of the distress information the MMSI of the vessel in distress and the nature of distress and on MF HF the mode of subsequent communication distress information symbols within a DSC message describing a distress situation consisting of the MMSI of the vessel in distress the nature of distress the position of the vessel in distress the UTC time of that position and the mode of subsequent communication engaged used to indicate that the equipment is busy handling an automated procedure factory default default value that is set by the manufacturer such that the field or behaviour is defined prior to any operator intervention general receiver receiver part of the transceiver used for the reception of all subsequent commun
67. ppropriate automated procedure or initiate their own automated procedure on hold 6 4 8 Alarms The reception of the first distress alert acknowledgement pertinent to the procedure shall sound a distress acknowledgement alarm Any subsequent acknowledgement shall only sound the self terminating alarm 6 4 9 Determining Subsequent communications On VHF it is always channel 16 On MF it is always 2 182 0 kHz radiotelephone or 2 174 5 kHz data On HF the frequency is given by a the distress telephony frequency in the band used for a single frequency distress alert attempt or b prior to acknowledgement the distress telephony frequency in the 8 MHz band if a multi frequency distress alert attempt c after reception or the sending of a distress alert acknowledgment the distress telephony frequency in the band of the sent or received distress DSC message The channel set is given by the mode of subsequent communication 6 4 10 Automated tuning Automatic tuning to the subsequent communications frequency or channel shall occur after transmission of the first distress alert attempt On HF the operator shall have at least a 10 s warning prior to an automated resending of the alert attempt where the operator may pause the resending in case engaged in traffic ETSI 21 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Upon reception of the first distress alert acknowledgement the tuning shall occur after the manual silencing of the alarm Subs
68. r the requested information if appropriate the mode frequency change or unable to comply and reason the frequencies of subsequent communication if any on HF the frequency of the acknowledgement the valid operator options and the sub stages of the procedure which are 1 waiting for free channel ETSI 31 Draft ETSI EN 300 338 2 V1 3 1 2008 12 2 transmitting 3 waiting for acknowledgement 4 linked for communications 5 procedure done no more to do At top level the elapsed time the stage of the automated procedure and operator options shall be displayed 6 6 3 1 Examples of sending non distress procedures displays on VHF equipment In the following figure is a set of example windows that could appear on a display screen during a sending non distress procedure The examples below show windows for a routine call 1 4 group call 5 and 6 and an urgency call 7 and 8 Calling 456444322 Calling 456444322 Calling 456444322 Waiting for 456444322 to reply 0 11 Reply received info Calling 456444322 Group call to 099988877 Group call to 099988877 Channel 72 ready for talk 0 02 Channel 6 ready for talk 0 25 for me ma fon fe Goo for fo foo Urgency call to all stations Urgency call to all stations Example windows of the Transmitting Channel 9 tuned for broadcast 0 12 sending non distress procedures 6 6 4 Handling received DSC Messages DSC messages pertinent to the station but not
69. r to confirm continuing with the cancel or to abort the cancel procedure If the latter is selected the sending distress automated procedure will be resumed If the user confirms the distress cancel then 1 ifthe distress alert was sent on VHF transmit the distress cancel on channel 70 2 if the distress alert was sent on MF transmit the distress cancel on 2 187 5 kHz 3 ifthe distress alert was sent on HF transmit the distress cancel on the DSC distress frequencies of all bands that were used for the HF distress alerts After the transmission of all of the self addressed distress alert acknowledgment the operator shall be given the subsequent communication options to voice cancel by either telephony or data telex If telephony is selected the general receiver and transmitter shall in a sequence automatically be tuned to the subsequent communication frequency for all channels the cancel distress DSC call have been transmitted on For each channel the operator shall be prompted to make the voice cancellation and the appropriate text for the voice cancellation shall be displayed The operator shall acknowledge the voice cancel on each channel before the equipment is tuned to the next communication frequency In case data was selected for voice cancel the general receiver and transmitter shall in a sequence automatically be tuned to the subsequent communication frequency for all channels the cancel distress DSC call have been transmitted o
70. raft ETSI EN 300 338 2 V1 3 1 2008 12 1 Scope The present document states the minimum requirements for equipment to be used for generation transmission and reception of Class A or B Digital Selective Calling DSC for use on board ships DSC may be used in the Medium Frequency MF High Frequency HF and Very High Frequency VHF Maritime Mobile Service MMS for both distress safety and general communications The present document is part 2 of a multi part standard that covers the requirements to be fulfilled by equipment that is either integrated with a transmitter and or a receiver or equipment that is a stand alone DSC terminal and has the following class of DSC e Class A includes all the facilities defined in annex 1 of ITU R Recommendation M 493 12 3 and complies with the IMO Global Maritime Distress and Safety System GMDSS carriage requirements for MF HF installations and or VHF installations Class B provides minimum facilities for equipment on ships not required to use class A equipment and complies with the minimum IMO GMDSS carriage requirements for MF and or VHF installations This equipment should provide for alerting acknowledgement and relay facilities for distress purposes calling and acknowledgement for general communication purposes and calling in connection with semi automatic automatic services as defined in ITU R Recommendation M 493 12 3 annex 2 clause 3 These requirements include the
71. results when the operator engages in communications established by non DSC means The procedure is initiated when the operator chooses to monitor a channel for non DSC traffic or non DSC traffic is initiated by the reception of an appropriate signal Note that the details in design of the automated procedure might depend upon the type of non DSC traffic being monitored For example the non DSC traffic may be initiated by the reception of an NBDP signal The critical purpose of this simple procedure is to assure that received DSC messages do not interrupt ongoing communications in the same manner that they do not disrupt any of the ongoing automated procedures handling DSC messages 6 8 2 Tasks The communications automated procedure shall handle the following events a received DSC messages pertinent to the station shall be allocated to the appropriate automated procedure or initiate their own automated procedure on hold b tune the general receiver and transmitter to the frequencies of communication c provide the operator with the option to 1 terminate the procedure 2 toggle between activating and placing the procedure on hold 3 provide any other options necessary for the traffic mode being handled 6 8 3 Display During the communications automated procedure the equipment shall display or make available to the operator the following items and or information a the fact one is engaged in a communications procedure b ind
72. riority non distress DSC message has no distress information is sent as a single DSC message on a single frequency and all subsequent communication information is given explicitly in the message Like any other non distress DSC message in the old recommendation it could be addressed to an individual a group an area or all ships and have one of several possible telecommands D 2 Alarming with critical errors If an automated procedure is initiated by a DSC message with critical errors errors in the information symbols such that the procedure cannot take any action such as generating acknowledgements the alarm shall self terminate The sound of the alarm shall be that it would have had if the DSC message were received without critical errors The alarm specified in table D 1 perhaps requiring manual termination shall be delayed until that time the reception of subsequent or repeat DSC messages allows the procedure to correct the critical errors ETSI 48 Draft ETSI EN 300 338 2 V1 3 1 2008 12 D 3 Default alarm sounds The accuracy of the tones and durations specified in the table are not critical since they are for the human ear and not electronic detection Nevertheless the error shall not be more than 5 in frequency and time The waveforms may be sinusoidal square triangular sawtooth or any other form as long as the fundamental tone is clearly recognizable The two tone and urgency alarms of table D 2 shall initially be
73. rm unique to the DSC message type with the two tone sound reserved for the distress alert or relay if it initiates the procedure which shall be manually silenced All subsequent DSC messages that are pertinent to the procedure shall sound the self terminating alarm 6 5 6 Determining Subsequent communications On VHF it is always channel 16 On MF it is either 2 182 0 kHz voice or 2 174 5 kHz data On HF the frequency band is given by a the frequency band of a single frequency distress alert attempt relay distress alert acknowledgement and relay acknowledgment b the 8 MHz band if a multi frequency distress alert attempt is received A distress alert attempt is considered to be multi frequency if two consecutive distress alerts are received on two different frequencies within a period of one minute This rule applies even if neither of the two distress alerts were received on the 8 MHz band c the channel set is given by the mode of subsequent communication d the band of subsequent communication given in c shall be used as the default DSC band for any subsequent distress DSC messages sent by the operator 6 5 7 Automated tuning The tuning to the subsequent communication frequencies as determined in clause 6 5 6 shall occur automatically upon reception of a distress DSC message in the following manner a on HF the operator shall have a 10 seconds warning prior any tuning if the new subsequent frequency is different from the
74. sting of a repetition of the 2 200 Hz frequency for 250 ms followed by 250 ms period of silence NOTE This alarm is used for the initiation of the received non distress DSC automated procedure when the category of the initiating DSC message is urgency The characteristics of this alarm on the equipment shall not be able to be altered watch receiver this unit is the separate receiver in DSC radios that continuously monitors the DSC distress frequencies on MF HF 2 187 5 kHz on MF and channel 70 on VHF NOTE On MF HF it is sometimes referred to as the scanning receiver word as part of the DSC sentence term word used to describe the 10 binary bits that make up the coded entities of a transmitted DSC message NOTE The 10 bits consist of a 7 bit symbol that gives the information content and 3 bit error check that gives the number of 0 binary bits in the 7 bit symbol 3 2 Abbreviations For the purposes of the present document the following abbreviations apply AIS universal shipborne Automatic Identification System ALE Automatic Linking Exchange DROBOSE Distress Relay On Behalf Of Someone Else DSC Digital Selective Calling ECC Error Check Character EUT Equipment Under Test GMDSS Global Maritime Distress and Safety System HF High Frequency IEC International Electrotechnical Commission ISO International Standardization Organization ITU International Telecommunications Union ITU R ITU Radiocommunications Sector ITU T ITU
75. t attempt via a menu or equivalent shall initiate the sending distress automated procedure with the alert attempt as composed by the operator use of the dedicated distress button without entering parameters of the alert attempt via a menu or equivalent shall initiate the sending distress automated procedure with the default alert attempt The default alert attempt is given by the following 1 undesignated nature of distress 2 the latest position of the vessel 3 the UTC time of that position 4 radio telephone for subsequent communication 5 on HF the multi frequency attempt using all six frequencies Use of the dedicated distress button without entering parameters of the alert attempt via a menu or equivalent shall initiate the sending distress automated procedure with the default alert attempt regardless of the state of the radio except when the radio is already engaged in the sending distress automated procedure The distress button sub procedure of the sending distress automated procedure shall be as follows a b c d e 6 4 5 lifting of the spring loaded lid or cover permanently attached to the equipment by for example hinges This is ACTION 1 pressing and holding the distress button ACTION 2 while i displaying the seconds remaining to transmission of the attempt starting at three and ii invoking an intermittent audio and intermittent visual alarm once each second stopping the procedure if the d
76. tation but not the procedure to the appropriate automated procedure or initiate their own automated procedure on hold c denote the procedure as acknowledged if the DSC message requires no acknowledgement ETSI d e g 6 7 3 34 Draft ETSI EN 300 338 2 V1 3 1 2008 12 provide and compose the acknowledgement options as dictated by the initial DSC message on HF tune the transmitter to the appropriate DSC frequency for any selected acknowledgement if an acknowledgement is required tune the general receiver and transmitter to the frequencies of subsequent communications when and if required provide the operator with the option to 1 prior to acknowledgment i comply if able ii comply with mode or frequency change if there are communications iii unable to comply iv ability to activate or place the procedure on hold v end the procedure 2 after acknowledgement or being considered acknowledged i resend the acknowledgment after sending the first acknowledgment ii ability to activate or place the procedure on hold iii end the procedure Display During the received non distress automated procedure the radio shall display or make available to the operator the following items and or information a b c d e f g the fact one is engaged in receiving a non distress DSC message the elapsed time since the procedure started prior to acknowledgment or the elapsed time since acknowledgeme
77. the procedure shall be allocated to the appropriate automated procedure or initiate their own automated procedure on hold DSC messages that are pertinent to the procedure are acknowledgements to the initial DSC message 6 6 5 Alarms The reception of the first acknowledgement pertinent to the procedure shall sound the appropriate acknowledgement alarm as specified in tables D 1 and D 2 Any subsequent acknowledgement may be ignored as only individually addressed non distress DSC messages have acknowledgements 6 6 6 Automated tuning On HF DSC messages using the duplex DSC channels requiring acknowledgements shall tune the general receiver to the anticipated frequency of the DSC acknowledgement If the DSC message requires subsequent communications the general receiver and transmitter shall be tuned to the frequencies given in the acknowledgement upon reception of the able to comply acknowledgement If the acknowledgement received is unable to comply the radio shall not tune to the originally proposed channel or frequency If the acknowledgement received is able to comply but proposes a new working frequency that is not available the radio shall not tune to the proposed frequency but inform the operator that he has to make a new call request to the called station ETSI 32 Draft ETSI EN 300 338 2 V1 3 1 2008 12 If no acknowledgement is required the transmitter shall be tuned to the frequency of subsequent communications
78. ties MF HF oooooocccccconcnononancnanonnnons 11 5 1 2 Watch receiver capabilities VHF 00 0 eeeeececsseceeceecsseceseeecsaecesneecsaecsneecsaececeeesaeceseeeesaeceeeeenaecseeeenaeeees 11 5 2 Remote alas R eee Selo ee i eal ee ee ee Se See A le On Sel og 11 5 3 Galvanic 1SO atio nies 5 0 scceesch eesti At 11 5 4 Mama Ae aris hie eee cd ahs Se au eee Ee eos Oo Ae Be eee ee Ee Bela 11 6 Automated and Non Automated Procedure Requirements in Class A B DSC Equipment 12 6 1 Intro MUCH OM VSA aoe E EE anwsaes is 12 6 2 Non atitomated Icaria ias 12 6 2 1 DSC Message COMPOSITION sisisi sionista poio Ee ase EErEE E EEE SE rE S SE R EEPE EES E R EREE ES 12 6 2 2 Transmission of DSC messages and prioritized Wait esessesesseesesressestterestrresestestssrerrssesrrnrsrenesreerssene 13 6 2 3 Alas o e r T ees EE e spans ET Er A e E E EEEE 14 6 3 O NN 14 6 4 Sending distress automated procedure n se re siei ereere reee EEE ES cnn nena ET EEEa TES neon nc E EEn EEEE 15 6 4 1 POCO A ES hie aera aes 15 6 4 2 TASKS cicle E E E E E EE E A E E A as 17 6 4 3 NN 17 6 4 3 1 Examples of sending distress procedure displays on VHF equipMeMt oooocccnccnccnnccconnconoconocnocnnocnnonnninnos 18 6 4 4 Dedicated distress button sub procedule ooocoocnnncnccnoonnonnnonoconoconocononononn nono nrnn cra nnnnnnnn ono cone cn neon neon nero nora ncnnnnns 19 6 4 5 Transmission of the alert AAA A 19 6 4 6 Updating positions ta todita 20 6 4 7 Handli
79. ven by 29 2y 2 40 3 12 The northwest corner point of the Mercator box before rounding shall be given by moving the centre point latitude north by the radius distance and the centre point longitude west by the radius distance y 33 9 S 1 20 N 61 10 W 1 36 W 31 49 S 62 46 W ETSI B 2 44 Draft ETSI EN 300 338 2 V1 3 1 2008 12 Rounding If the enhanced geographic position expansion option is not used the northwest corner point and Mercator box dimensions shall be rounded The rounding shall take place as follows a b c d B 3 a b c d The northwest corner point latitude shall be moved northward to the nearest whole degree latitude and the longitude shall be moved westward to the nearest whole degree longitude 31 49 S becomes 31 S a movement of 49 N and 62 46 W becomes 63 W a movement of 14 W The northward and westward movements needed to round the northwest corner point to whole degrees shall be added to the latitude height and longitude width of the Mercator box 2 40 49 3 12 14 3 29 3 26 The final dimensions of the Mercator box shall be rounded upward to the nearest whole degree 4 4 Special cases for either form of area data entry If the final northwest corner point via either entry method exceeds 90 N it shall be truncated to 90 N and the latitude height of the Mercator box shall be adjusted accordingly If t
80. which provides a brief explanation to the operator The only choice is to proceed and in the sixth figure the EUT provides the text of the voice cancel message that the operator can read Upon completion of the voice cancel the operator returns to the distress procedure in its acknowledged state still tuned to channel 16 Note that the operator does have the option to repeat the procedure perhaps instructed to do so by a coast station That action would bring the operator back to the fourth figure However once the finish option is selected no further DSC cancels can be sent The seventh figure shows the return to the sending distress procedure now in its acknowledged state Further communications may continue DISTRESS Undesignated WARNING Press Start Waiting f ly 0 33 f ees You are asking to cancel this distress to start the cancel operation Time to auto resend 4 09 since it was in error or otherwise no Cad in Sending the DSC distress cancel DSC complete Tuned to 16 You are Text of distress cancel message here now to give the voice cancel Standby for further information announcement Press continue and read the msg Example windows of the cancel distress procedure at AA various stages The above examples are only examples They show one means of providing the minimum required information The layout method and choice of text are up to the manufacturer 6 4 12 Acknowledgments The proce

EN 300 338-2 - V1.3.1 - Electromagnetic compatibility and

Contents

Download Pdf Manuals

Related Search

Related Contents