Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Direct dialling in on private branch exchanges. Specification for direct dialling in on private branch exchanges with termina
标准号:BS 6450 Sec.3.1-1993
标准名称: 与公用电信话务员操作的公用交换电话网连接的专用支线交换机. 第3节:专用支线交换机直接拨入设备.第1小节:带终端的专用支线交换机直接拨入规范
英文名称:Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Direct dialling in on private branch exchanges. Specification for direct dialling in on private branch exchanges with termina
标准类型:国外标准
标准状态:现行
中国标准分类号(CCS):M40