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- APPENDIX II
- (to Recommendation X.224)
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- Differences between Recommendation X.224 and ISO 8073 (1986)
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- Recommendation X.224 and ISO 8073 (1986) are technically aligned except for
- the differences listed below:
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- II.1 Defect reports
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- In collaboration, ISO and CCITT have agreed to corrections resulting from
- defect reports. Recommendation X.224 includes corrections from Reports 4, 6, 7, 9,
- 11, 16, 17, 20, 22, 23, 27, 28, 29 (items 1-7), 32, 33, 34, 35, 36, 38, 39 (item 2),
- 40, 41, 42, 43, 45, 52, 56, 59, 61, 65, 67, 69, 71, 72, 73, 74 (items 1-3 and 5-10),
- 77 (item 2), 80, 81, 85, 89, 91, 93, 94, 103 and 106. An update of ISO 8073 had not
- yet been published by March 1988.
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- Note - Defect Reports 1, 2, 3, 5, 10, 12, 13, 14, 15, 18, 19, 21, 25, 26, 51, 57,
- 58, 60, 66, 74 (items 4, 11 and 12), 82, 84, 87, 88, 90, 92, 95, and 107 do not
- apply to Recommendation X.224 and in addition Defect Reports 8, 24, 29 (item 2), 39
- (item 1), 46, 48, 55, 62, 64 (item 2), 68, 76 (item 2), 77 (item 1), 79, 86, 97, 99
- and 104 have been rejected. No further changes to Recommendation X.224 will be made
- as a result of these defect reports.
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- II.2 Conformance
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- Recommendation X.224, in section 14, requires all systems to implement
- class 0. ISO 8073, in Clause 14, requires all systems to implement either
- class 0 or class 2.
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- II.3 Class negotiation
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- An additional restriction regarding the classes of transport protocol that
- are proposed in a CRTPDU is defined in item (a) in sub-section 14.4 of
- Recommendation X.224. No such restriction is contained in ISO 8073.
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- II.4 Precedence
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- ISO 8073, in its Annex A ( ), includes the statement: "In the event of a
- discrepancy between the description in these tables and that contained in the text,
- the text takes precedence." Recommendation X.224 does not contain this statement.
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- II.5 Assignment to network connections
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- In section 6.1.3 of Recommendation X.224 it is stated that the responder to
- the transport connect request becomes aware of the assignment when it receives
- particular TPDUs. In Clause 6.1.3 of ISO 8073 it is the non-owner of the network
- connection that becomes aware of the assignment upon receipt of these same TPDUs.
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- II.6 Transport protocol identification
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- The material contained in Annex B of Recommendation X.224 is not present in
- ISO 8073.
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- II.7 Checksum algorithms
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- The material contained in Appendix I to Recommendation X.224 is contained in
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- Annex B to ISO 8073.
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- II.8 Differences between Recommendation X.224 and ISO 8073
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- The material in this appendix is not present in ISO 8073.
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