AT&T和MCl继续扩大其服务,其中,一种采用话音压缩的系统将提高网络的能力及灵活性。AT&T的这个综合访问和交叉连接系统以CCITT链路访问协议D标准为基础,可在ISDN “D”信道传送信息,在T1网络内对话音、数据和图象信息进行分组打包。公共和专用网的管理者可以利用该系统复接和交叉连接24条T1线路。该系统还具 AT & T and MCl continue to expand their services, with a system that uses voice compression that will increase network capacity and flexibility. Based on the CCITT Link Access Protocol D standard, AT & T’s comprehensive access and cross-connect system delivers information over ISDN “D” channels and packetizes voice, data and video information over T1 networks. Public and private network managers can use the system to multiplex and cross-connect 24 T1 lines. The system also has