CEPT T CS 42-03 E-1986 System R2 Line Signalling Digital Version (ETR 251 1996)《系统R2线信令 数字版(ETR 251 1996)》.pdf

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1、CEPT T/CS*42-03*E m 2326434 0004782 9 m 0 42-03 Page E 1 Recommendation T/CS 42-03 (Innsbruck 1981, revised at Vienna 1982, Cannes 1983 and Nice 1985) SYSTEM R2 LINE SIGNALLING DIGITAL VERSION Recommendation proposed by Working Group T/WG 1 1 “Switching and Signalling” (CS) Text oj the Recommendatio

2、n revised adopted by Commission “Telecommunications”: This Recommendation details the digital line signalling version of signalling System R2. It is identical to the relevant CCITT Recommendations (4.421-424) in all respects, except that a note has been added to allow the use of the analogue line si

3、gnalling protocols via a digital bearer, by bilateral agreement, even though it is not recommended. (Addition of: “but may be used by bilateral agreement” at the end of note 1 to section 3.1. of Recommenda- tion 4.421 .) The document contains sections dealing with: - Digital line signalling code. - Protection against the effects of faulty transmission. Edition of May 15, 1986