规定了直接或间接连接至语音带专用电路的设备（包括专用测试设备）的要求。规定公共电信系统的安全性，使其免受来自所连接设备的电气条件的影响，反之亦然，并最大限度地减少对其他用户和公共电信运营商主传输设备的干扰。交叉引用:BS 4265BS 4727:第1部分:01BS 4727组:第3部分:01BS 4727组:第3部分:02BS 5428组:第9部分BS 6301BS 6305BS 6310BS 6312BS 6317BS 6789:第2部分规范D 2487ACCITT建议B.12CCITT建议M.1020CITT建议M.1025CITT建议M。 1040CCITT建议M.1060CCITT建议O.71CCITT建议O.91CCITT建议P.52CCITT建议P.531984年电信法

Specifies requirements for apparatus, including specialized test apparatus, to be connected to speechband private circuits either directly or indirectly. Provides for safety of public telecommunications systems from electrical conditions originating in the connected apparatus and vice-versa, and minimizing interference with other users and the public telecommunication operators' main transmission plant.Cross References:BS 4265BS 4727:Part 1:Group 01BS 4727:Part 3:Group 01BS 4727:Part 3:Group 02BS 5428:Part 9BS 6301BS 6305BS 6310BS 6312BS 6317BS 6789:Part 2BT Specification D 2487ACCITT Recommendation B.12CCITT Recommendation M.1020CCITT Recommendation M.1025CCITT Recommendation M. 1040CCITT Recommendation M.1060CCITT Recommendation O.71CCITT Recommendation O.91CCITT Recommendation P. 52CCITT Recommendation P.53Telecommunications Act 1984