CEPT T L 03-03 E-1981 Multiplex Equipment Providing Digital Access (at 64 KBit s or N X 64 KBit s)《提供数字接入的复用设备(速率为64Kbit 秒或NX 64 Kbit 秒)》.pdf

1、1 i CEPT T/L*03-03*E 3 E 2326434 0005993 5 W I Page 1 (old reference: T/TR 03-03 E) Recommendation T/L 03-03 (Innsbruck 1981) MULTIPLEX EQUIPMENT PROVIDING DIGITAL ACCESS (AT 64 KBIT/S OR n x 64 KBIT/S) Recommendation proposed by Working Group T/GT 12 “Transmission” (TR) Text of the Recommendation a

2、dopted by the “Telecommunications” Commission: “The European Conference of Posts and Telecommunications Administrations, considering - that it is desirable to be able to provide one or several data channels through the telephone network, - that the installation and operation of digital multiplex equ

3、ipment offering digital access from different origins require that they should be standardized, - that the relevant CCITT existing Recommendations contain various options and differences which are necessary on a worldwide basis, - that the CEPT Administrations support the harmonization of telecommun

4、ication equipment and systems which could lead to a reduction in the development and production costs for the manufacturers supplying equipment to several countries, O recommends that the members of the CEPT adhere to the specifications for multiplex equipmentproviding digital access contained in th

5、is Recommendation.” Recommendation T/L 03-03 corresponds to the following Recommendations: Recommendation G.735: “Characteristics of primary PCM multiplex equipment operating at 2,048 kbit/s and offering digital access at 384 kbit/s and/or synchronous digital access at 64 kbit/s.” Recommendation G.736: “Characteristics of a synchronous digital multiplex equipment operating at 2,048 kbit/s.” Recommendation G.737: “Characteristics of an external access equipment operating at 2,048 kbitls and/or syn- chronous digital access at 64 kbit/s.” Edition of December 15, 1987 -7 !