29 Maximum number of 6-bit characters based upon typical bit stuffing Estimated number Message 25 Message 26 Addressed Broadcast of slots binary binary Addressed Broadcast Addressed Broadcast Message 6 Message 8 binary binary binary binary 1 6 11 6 11 2 7 2 43 48 40 45 − − 3 80 86 77 82 − − 4 118 123 114 120 − − 5 151 156 150 163 − − NOTE 1 The 5-slot accounts for the worst case bit stuffing condition. – 5.2 International function message 2: Interrogation for a specific functional message IFM 2 should be used by an application to interrogate (using Message 6) another application for the specified functional message. The application responding to this interrogation should use an addressed binary message to reply. TABLE 30 Parameter Number of bits Description Message ID 6 Identifier for Message 6; always 6 Repeat indicator 2 Used by the repeater to indicate how many times a message has been repeated. See § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more Source ID 30 MMSI number of source station Sequence number 2 0-3; see § 5.3.1, Annex 2 Destination ID 30 MMSI number of destination station Retransmit flag 1 Retransmit flag should be set upon retransmission: 0 = no retransmission = default; 1 = retransmitted 1 Not used. Should be zero DAC 10 International DAC = 110 = 00000000012 FI 6 Function identifier = 210 = 0000102 Requested DAC code 10 IAI, RAI or test Requested FI code 6 See appropriate FI reference document(s) Spare bits 64 Not used, should be set to zero, reserved for future use Total number of bits 168 The resulting Message 6 occupies 1 slot.
29 Estimated number of slots Maximum number of 6-bit characters based upon typical bit stuffing Addressed binary Message 6 Broadcast binary Message 8 Message 25 Message 26 Addressed binary Broadcast binary Addressed binary Broadcast binary 1 6 11 6 11 2 7 2 43 48 − − 40 45 3 80 86 − − 77 82 4 118 123 − − 114 120 5 151 156 − − 150 163 NOTE 1 – The 5-slot accounts for the worst case bit stuffing condition. 5.2 International function message 2: Interrogation for a specific functional message IFM 2 should be used by an application to interrogate (using Message 6) another application for the specified functional message. The application responding to this interrogation should use an addressed binary message to reply. TABLE 30 Parameter Number of bits Description Message ID 6 Identifier for Message 6; always 6 Repeat indicator 2 Used by the repeater to indicate how many times a message has been repeated. See § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more Source ID 30 MMSI number of source station Sequence number 2 0-3; see § 5.3.1, Annex 2 Destination ID 30 MMSI number of destination station Retransmit flag 1 Retransmit flag should be set upon retransmission: 0 = no retransmission = default; 1 = retransmitted 1 Not used. Should be zero DAC 10 International DAC = 110 = 00000000012 FI 6 Function identifier = 210 = 0000102 Requested DAC code 10 IAI, RAI or test Requested FI code 6 See appropriate FI reference document(s) Spare bits 64 Not used, should be set to zero, reserved for future use Total number of bits 168 The resulting Message 6 occupies 1 slot.
R-REC-M.1371-5-201402-I!!MSW-E.docx