规定了使用SCVF信号直接或间接连接到电报专用电路的设备（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 800BS 4727:第3部分:03BS 6301BS 6312BS 6320BT规范D 2487ABT规范RC 5565BT规范RC 519HBT规范RC 6083ABT规范S 1541CITT第2号CITT建议B.12CCITT建议R.20CCITT建议S.3Telecommunications Act 1984

Specifies requirements for apparatus, including specialized test apparatus, to be connected to telegraph private circuits using SCVF signalling 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 800BS 4727:Part 3:Group 03BS 6301BS 6312BS 6320BT Specification D 2487ABT Specification RC 5565BT Specification RC 519HBT Specification RC 6083ABT Specification S 1541CCITT No. 2CCITT Recommendation B.12CCITT Recommendation R.20CCITT Recommendation S.3Telecommunications Act 1984