CEPT T L 03-04 E-1981 Plesiochronous Multiplex Equipment at 8 448 34 368 and 139 264 KBit s《速率为8448、34368和139264 Kbit 秒的准同步复用设备》.pdf

1、Page 1 (old reference: T/TR 03-04 E) PLESIOCHR OUS Recommendation T/L 03-04 (Innsbruck 1981) 4SJLTIPLEX EQUIPMENT AT 8,448,34,368 139,264 KBIT/S Recommendation proposed by the Working Group T/GT 12 “Transmission” (TR) Text of the Recommendation adopted by fhe “Telecommirnications” Commission: “The E

2、uropean Conference of Posts and Telecommunications Administrations, considering - that digital multiplex equipment is used to connect two levels of the hierarchy, - that primary and second order digital multiplex equipment exist which are different according to the characteristics of various network

3、s (synchronous equipment, equipment with positive/zero/negative justification), - that the installation and operation of digital multiplex equipment from different origins require that they should be standardized, - that the relevant CCITT existing Recommendations contain various options and differe

4、nces 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 production costs for the manufacturers supplying equipment to several countries, recommends that

5、the members of the CEPT adhere to the specifications for plesiochronous multiplex equipment at 8,448, 34,368 and 139,264 kbit/s contained in this Recommendation.” Recommendation T/L 03-04 corresponds to the following CCITT Recommendations: Recommendation G.742: “Second order digital multiplex equipment operating at 8,448 kbit/s and using positive justification.” Recommendation G.751: “Digital multiplex equipments operating at the third order bit rate of 34,368 kbit/s and the fourth order bit rate of 139,264 kbit/s and using positive justification.” Edition of December 15, 1987 t