CEPT T L 03-06 E-1981 Transmultiplexing《复用转换》.pdf

1、 TL03-06 Page E 1 (old reference: T/TR 03-06 E) Recommendation TIL 03-06 (mbruck 1981) TRANSMULTIPLEXING Recommendation proposed by Working Group T/GT 12 “Transmission” (TR) Text of the Recommendation adopted by the “Telecommunications” Commission: “The European Conference of Posts and Telecommunica

2、tions Administrations, considering - the advantages offered in some cases by direct through-connection (without voice-frequency interfaces) from FDM signals to TDM signals and vice versa, - that the installation and operation of transmultiplexers of different origins require that they should be stan

3、dard- ized, - 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 telecommunication equipment and systems which could lead to a reduction in the development and

4、 production costs for the manufacturers supplying equipment to several countries, O recommends that the members of the CEPT adhere to the specifications for transmultiplexing equipment contained in this Recommendation.” Recommendation T/L 03-06 corresponds to the following CCITT Recommendations: Rec

5、ommendation G.79 1 : “General considerations on transmultiplexing equipment”, adding: “CEPT countries only use the A-law and the 2,048 kbit/s bit rate.” Recommendation G.792: “Characteristics common to all transmultiplexing equipments” with the following modifi- cation: Add the following note to par

6、agraph 22.2. Note. On account of the effect of the gain increase due to the PCM coding of a very low level input signal, it is necessary to increase, for the measurements, the level of the disturbing signal mentioned in Recommendation G.242. Recommendation G.793 : “Characteristics of 60-channel transmultiplexing equipments.” -: Edition of December 15, 1987 I I