第二项计划包括在警署每个羁留室安装一个内部通话器及警钟系统，连接至当值人员办公桌旁的一个控制台。
The second includes installation of an intercom and buzzer system in every police cell , linked to a console beside the duty officer ' s desk.
系统内可多方同时通话，且通话不通过扬声器向外广播。
The system can realize multi-user call and the sound may not spread from the speaker.
海上导航和无线电通信设备及系统。数字接口。第2部分：高速传送的单个通话器和多个受话器。
Maritime navigation and radiocommunication equipment and systems - digital interfaces - part 2: single talker and multiple listeners, high - speed transmission.
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