数据传输母线上连接各控制室的音频通路的最大数量为16。
The maximum number of audio channels on the bus which links the cabinets is 16.
承载通路连接协议在本地交换机的控制下根据需要来建立和清除承载连接，该连接由信令信息来标识。
A bearer channel connection protocol establishes and de-establishes bearer connections required on demand, identified by the signalling information, under the control of the Local Exchange.
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