1、Page 1 (old reference: T/TR 03-05 E) Recommendation TIL 03-05 (Innsbruck 1981) DIGITAL, SECTIONS AND LINE SYSTEMS AT 2,048,8,448,34,368, 139,264 AND 564,992 KBIT/S Recommendation proposed by Working Group T/GT 12 transmission (TR) Text of the Recommendation adopted by the “Telecommunications” Commis
2、sion: “The European Conference of Posts and Telecommunications Administrations, considering - that digital line sections and digital line systems are used within national networks as well as for the international interconnection of national networks, - that the installation and operation of digital
3、sections and line systems 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 telecommunicati
4、on 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 digital sections and line systems at 2,048,8,448,34,368, 139,264
5、 and 564,992 kbit/s contained in this Recommendation.” Recommendation T/L 03-05 corresponds to the following CCITT Recommendations: Recommendation G.921: “Digital sections based on the 2,048 kbit/s hierarchy.” Recommendation G.950: “General considerations on digital line systems.” Recommendation G.9
6、52: “Digital line systems based on the 2,048 kbit/s hierarchy on symmetric pair cables.” Recommendation G.954: “Digital line systems based on the 2,048 kbit/s hierarchy on coaxial pair cables.” Recommendation G.956: “Digital line systems based on the 2,048 kbit/s hierarchy on optical fibre cables.” -_ - ” % Edition of December 15, 1987 I I=/
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