发明授权
US4466092A Test data insertion arrangement for a conference circuit 失效
测试会议电路的数据插入布置

Test data insertion arrangement for a conference circuit
摘要:
A time shared conference circuit for establishing conference calls in a T-S-T digital switching network provides for automatically inserting predefined test data into unused time slots of its output PCM voice data stream. The transmission of this predefined data verifies the interface operation of the conference circuit with the switching network.
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