ITU-T G 731-1993 PRIMARY PCM MULTIPLEX EQUIPMENT FOR VOICE FREQUENCIES《音频用基群脉冲编码调制(PCM)复用设备》.pdf

《ITU-T G 731-1993 PRIMARY PCM MULTIPLEX EQUIPMENT FOR VOICE FREQUENCIES《音频用基群脉冲编码调制(PCM)复用设备》.pdf》由会员分享，可在线阅读，更多相关《ITU-T G 731-1993 PRIMARY PCM MULTIPLEX EQUIPMENT FOR VOICE FREQUENCIES《音频用基群脉冲编码调制(PCM)复用设备》.pdf（3页珍藏版）》请在麦多课文档分享上搜索。

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G0!30%#43G0G0/ further amended)The CCITT,consideringthat pulse code modulation (PCM) multiplex equipments are already used in various countries, in particular toprovide a large number of short-distance

2、telephone circuits on certain pairs in existing cables, and in order to minimizethe number of different PCM multiplex equipments providing circuits which may be used in international connections,recommendsthat Administrations concerned should make their choice between the two primary PCM multiplex equipmentsdescribed in Recommendations G.732 and G.733.