Apparatus for connection to private circuits run by certain public telecommunication operators-Specification for apparatus for connection to direct current circuits
连接到某些公共电信运营商运营的专用电路的设备 直流电路连接用设备规范
Specifies requirements for apparatus to be connected to direct current private circuits run by certain telecommunications operators to minimize the risks of interference with other users. Direct current private circuits are intended for intruder or fire alarms and equipment operated by change in direct current or voltage.Cross References:BS 4265BS 4727:Part 1:Group 01BS 4727:Part 3:Group 01BS 4727:Part 3:Group 02BS 6301BS 6305CCITT Recommendation B.12Telecommunications Act 1984