1985年，英国电信公司(BT)推出综合数字通信网络。它向用户提供话音、快速传送图表、传真、慢扫描电视终端等。
In 1985, British Telecom (BT) introduced integrated digital communications network. It provides users with voice, fast delivery chart, fax, slow scan television terminals.
收到信息的确认。数字信号响应确认全部接收传真数据的准备过程已经完成，通信传输可以开始了。
Confirmation to Receive. A digital response confirming that the entire pre-message procedure for receiving a fax has been completed, and that message transmissions may commence.
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