1、 TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Message Type Assignments for the Extended Protocol Facility of TIA-136, TIA-691 and TIA/EIA/IS-2000 TSB-39-B (Revision of TSB-39-A) AUGUST 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications s
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24、ternational (303) 397-7956 TSB39-A11. Introduction 1 Revision C of EIA/IS-3 introduced the facility of “extended protocol” where neither the 2 coding nor use of the message type was standardized. The extended protocol facility 3 usage was standardized by TIA-691 and is also indirectly referenced by
25、TIA/EIA/IS-4 2000.6. In addition, the extended protocol facility allowed for proprietary 5 implementations through the reservation of Message Type Codes. 6 To avoid confusion resulting from multiple assignments, the Committee recognized the 7 need to provide a single master list of the message type
26、codes that have been registered 8 for the analog air interface. Manufacturers or others wishing to register non-standardized 9 use of particular message type codes should refer to section 3 of this document. 10 2. Message Type Codes 11 The following message type codes were adopted within TR451 for i
27、nclusion in TIA-12 691, and have been approved in Committee: 13 Message Type Code Registered User 0000 0000 TIA-691 0000 0111 TIA-691 0011 0001 TIA-691 0110 0001 TIA-691 1010 0001 TIA-691 1100 0001 TIA-691 1111 0001 TIA-691 14 The following message type codes were registered prior to adoption of the
28、 selection 15 criteria described in Section 32, and have been approved in Committee: 16 Message Type Code Registered User 1000 0000 Motorola 1000 0001 Motorola 1000 0010 Motorola 1000 0011 Motorola 1000 0100 Motorola 00 0101 Motorola 1000 0110 Motorola 1000 0111 Motorola 17 TSB39-A 2In addition, the
29、 following message type codes are registered: 1 Message Type Code Registered User 0101 1110 US West 2 Use of all other codes is undefined. 3 3. Administration of this Document 4 This Bulletin records the message type codes that have been registered. Use of message 5 type codes not assigned to publis
30、hed standards is beyond the scope of this document. . 6 3.1. Request for Message Type Code 7 By way of written correspondence, manufacturers or others may request use of particular 8 message type codes. Upon receipt of the inquiry, the matter will be researched. If the 9 particular message type code
31、s present no technical difficulties, an update of this Bulletin 10 is warranted, and it will be prepared and published within sixty days. If requested in the 11 correspondence, the individual or organizations affected will be notified upon approval 12 by the responsible committee, and prior to publi
32、cation. 13 By way of written correspondence, manufacturers or others may request that message 14 type codes be assigned by the committee and registered for their use. Upon receipt of the 15 inquiry, the matter will be researched, and particular message type codes which present 16 no technical diffic
33、ulties will be assigned. An update of this Bulletin will be prepared and 17 published in a timely manner. If requested in the correspondence, the individual or 18 organizations affected will be notified upon approval by the responsible committee, and 19 prior to publication. 20 3.2. Selection of Mes
34、sage Type Codes 21 Codes are selected from a matrix of 4-bit Gray codes to provide message type codes 22 which differ in at least two bit positions. This minimizes the possibility of a single bit 23 error causing misinterpretation of a message type. The Gray code sequence is such that 24 neighbors i
35、n the sequence differ by a single bit transition. For example, the Gray code 25 sequence for 3-bits may show as: 26 000 001 011 010 110 111 101 100 27 Selection of message type codes using every second member of the Gray code sequence 28 ensures that message type codes differ in more than a single b
36、it position. 29 TSB39-A3Table 1 Gray Code Matrix 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1600 01 03 02 06 07 05 04 0C 0D 0F 0E 0A 0B 09 081 00 00 01 02 07 04 0D 0E 0B 082 10 10 13 16 15 1C 1F 1A 19 3 30 31 32 37 34 3D 3E 3B 384 20 20 23 26 25 2C 2F 2A 29 5 60 61 62 67 64 6D 6E 6B 686 70 70 73 76 75 7C
37、 7F 7A 79 7 50 51 52 57 54 5D 5E 5B 588 40 40 43 46 45 4C 4F 4A 49 9 C0 C1 C2 C7 C4 CD CE CB C810 D0 D0 D3 D6 D5 DC DF DA D9 11 F0 F1 F2 F7 F4 FD FE FB F812 E0 E0 E3 E6 E5 EC EF EA E9 13 A0 A1 A2 A7 A4 AD AE AB A814 B0 B0 B3 B6 B5 BC BF BA B9 15 90 91 92 97 94 9D 9E 9B 9816 80 80 81 83 82 86 87 85 8
38、4 8C 8F 8A 89 2 Table 1 uses the hexadecimal notation, and illustrates the 4-bit Gray code matrix. The 3 table contains the hexadecimal value of those codes available for selection. Codes which 4 have already been selected at publication of this document are shown in bold typeface. 5 The method of s
39、electing message type codes is: starting in row 3 of each even numbered 6 column, select codes down the column until rows 3 through 15 are all assigned; once 7 these are used, then select across each row starting at row 16, column 1 to column 15 8 working upwards selecting each even row; lastly, sel
40、ect across row 1. 9 If all these codes are assigned, then additional codes must be selected from the positions 10 in Table 1 that contain dashes. Care must be taken when selecting these codes to ensure 11 that they are not too similar to message type codes considered critical. 12 3.3. Inquiries 13 A
41、ll inquiries and other correspondence regarding this bulletin should be addressed to: 14 Editor, Telecommunications Systems Bulletin TSB39 15 ANSI Accredited Engineering Committee TR45 16 Mobile & Personal Communications Standards 17 Telecommunications Industry Association 18 2500 Wilson Boulevard, Suite 300 19 Arlington, VA 22201 20 21
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