ANSI ATIS 1000602-1996 Integrated Services Digital Network (ISDN) C Data-Link Layer Signaling Specification for Application at the User- Network Interface (Formerly ATIS T1.602).pdf

1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000602.1996(R2014) Integrated Services Digital Network (ISDN) Data-Link Layer Signaling Specification for Application at the User-Network Interface As a leading technology and solutions development organization, ATIS brings together the top gl

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11、National Standards Institute. Notice of Disclaimer restart T200; andATIS-1000602.1996 5 7) On page 40 of Q.921, paragraph 2 of clause 5.6.7 shall be modified to read: If timer T200 expires, the data link entity shall: if it is not in the timer recovery condition, enter the timer recovery condition a

12、nd reset the retransmission count variable; if it is already in the timer recovery condition, add one to its retransmission count variable, and continue as indicated below. 8) On page 40 of Q.921, item a) under paragraph 3 of clause 5.6.7 shall be modified to read: a) if the value of the retransmiss

13、ion count variable is less than N200: restart T200; and either transmit an appropriate supervisory command (see note 2 in 5.6.5) with a P bit set to 1; or retransmit the last transmitted I frame V(S) - 1 with the P bit set to 1; or 9) On page 42 of Q.921, item a) under paragraph 1 of clause 5.8.5 sh

14、all be modified to read: a) the receipt of an undefined or unimplemented frame (see 3.6.1, third paragraph); 10) Annexes A, B, C, D, and E are informative and are not an integral part of this recommendation. 11) On page 54 of Q.921, the SDL in figure B.4/Q.921 (sheet 1 of 2) shall be replaced with t

15、he SDL shown in Figure 1. ATIS-1000602.1996 6 4 TEI ASSIGNEDDL-ESTABLISH requestMDL-REMOVE requestPERSISTENT DEACTIVATIONSABME DISCESTABLISH DATA LINKDISCARD UI QUEUEDISCARD UI QUEUEF = P F = PSET LAYER 3 INITIATEDABLE TO ESTABLISHTX DMTX UACLEAR EXCEPTION CONDITIONSV(S) = 0 V(A) = 0 V(R) = 0DL-ESTA

16、BLISH indicationSTART T2037 MULTIPLE FRAME ESTABLISHEDTX DM4 TEI ASSIGNED4 TEI ASSIGNED1 TEI UNASSIGNED4 TEI ASSIGNED4 TEI ASSIGNEDDL-RELEASE requestDL-RELEASE confirm5 AWAITING ESTABLISHMENTNoYesNoteNOTE Implementation option when implementing backup D-channel procedures for non-facility associated signaling Figure 1 Replacement for figure B.4/Q.921 (sheet 1 of 2) ATIS-1000602.1996 7 Annex A (informative) Bibliography ANSI X3.4-1986, Information systems Coded character sets 7-bit American National Standard code for information interchange (7-bit ASCII)