| 摘要 |
PURPOSE:To individually transfer alarm information by one piece of transmission line, by using a data ring bit contained in a frame bit of a PCM primary group signal, as an alarm signal. CONSTITUTION:A data ring bit contained in a frame bit of a PCM primary group signal 1a and 2a is used for transferring an alarm, and an alarm signal contained in the PCM primary group signal 1a inputted from an input line 1 passes though a transmission line 4 from an ADPCM transcoder 3 and inputted to an ADPCM transcoder 5, and transferred to an output line 6. On the other hand, an alarm signal contained in the PCM primary group signal 2a inputted from an input line 2 is outputted to the transmission line 4 from the ADPCM transcoder 3 and inputted to the ADPCM transcoder 5, transferred to an output line 7, and alarm information of plural PCM primary group signals is individually transferred by one piece of transmission line, respectively.
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