BS 6833-1:1987 AMD1. Apparatus using cordless attachments (excluding cellular radio apparatus) for connection toanalogue interfaces of public switched telephone networks. Specification for general requirements
BS 6833-1:1987“使用无绳附件(蜂窝无线电设备除外)连接到公共交换电话网模拟接口的设备.第1部分.一般要求规范”的修订草案