1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000608.a.1992(R2012) Integrated Services Digital Network (ISDN) Signaling Specification for X.25 Packet-Switched Bearer Services for Digital Subscriber Signaling System Number 1 (DSS1): Terminal Initialization Procedures for Packet-Mode Data A
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12、n. (See annex A of ANSI T1.608a-1992 for the associated procedures.) See clause 3 of ANSI T1.610 (specifically, Section 8.2.1 of CCITT Recommendation Q.932) for the coding of the Endpoint identifier information element. ANSI Tl.608a-1992 Page 6 of 7 pages Insert the following normative annexes as an
13、nexes A and B of this standard. Redesignate the current annexes A and B (both of which are informative) as annexes C and D, respectively. Annex A (normative) User service profiles and terminal identification This annex is identical to annex A of CCITT Recommendation Q.932, as referenced and modified
14、 by clause 3 of ANSI T1.610. Annex B (normative) Information request procedures This annex is identical to annex E3 of CCITT Recommendation Q.932, as referenced and modified by clause 3 of ANSI T1.610, with the following qualifications: a) The material on the Overlap Sending and Call Delivered call
15、states shall be applicable to case A access only; b) The statement that “This capability is intended for use with the Keypad and Feature Key Management protocols” shall be applicable to case A access only; c) The statement that “The network will restart timer T302.if the requested information is not
16、 complete” shall be applicable to case A access only; d) The material on the Keypad facility and Called party number information elements shall be applicable to case A access only; e) The material on “Normal procedures” for the call-associated case (e.g., use of a CALL PROCEEDING message, initiation
17、 of call clearing) shall be applicable to case A access only. The material on “Normal procedures” for the non-call-associated case shall be applicable to both case A access and case B access; f) The condition that I. if the information received is incomplete upon expiry of timer T302” shall be appli
18、cable to case A access only; g) The material on “Abnormal procedures” for the call-associated case (e.g., initiation of call clearing) shall be applicable to case A access only. The material on “Abnormal procedures” for the non-call-associated case shall be applicable to both case A access and case
19、B access. All other material in annex B, which is not covered by qualifications (a) - (g), shall be applicable to both case A access and case B access. In addition, all references to “CCITT Q.931” within annex B of CCITT Recommendation Q.932, i.e., references to “ANSI T1.607” based on the modificati
20、ons in Section 3 of ANSI T1.610, should be extended to read “ANSI T1.607 and ANSI T1.608”. ANSlT1.608a-1992 Page 7 of 7 pages The following changes pertain to figures that appear in annex A of the main document, ANSI T1.608-1991. In future revisions, when the information in ANSI T1.608-1991 and ANSI
21、 T1.608a- 7992 are merged, this annex will be redesignated as annex C and the prefix letters of these figures will change from A to C. In figure A. I, replace Note 8 with the following: 8 Not shown in the diagram is the X.25 restart procedure performed after link setup. In figure A.3, replace Note 6
22、 with the following: 6 Not shown in the diagram is the X.25 restart procedure performed after link setup. In figure A.5, replace the “Note 2” tag under the line representing the UA frame with a tag that reads “Notes 2,3”. Add the following note to the list of notes at the bottom of the figure: 3 Not
23、 shown in the diagram is the X.25 restart procedure performed after link setup. In figures A.6 and A. 7, replace the “Note 2” tag under the line representing the UA frame with a tag that reads “Notes 2,3”. Add the following note to the lists of notes at the bottom of each figure: 3 The X.25 Restart procedure should follow the link setup, if that link was not already established. ANSI T1.608a-1992
