| 摘要 |
PURPOSE:To prevent a clock from being in difficulties for extraction, by inserting the inverted information of a channel in use to an unused channel by using dismounting information when the channel on one side is dismounted in the multiplexing of two channels. CONSTITUTION:When the channel 1 is dismounted, both terminals 10 and 11 go to (L)s of ECL levels, and gates 1 and 4 are closed, and a gate 6 is opened. Thereby, the inverted information of the channel 2 is outputted from the gate 3, At this time, the information of the channel 2 is outputted from a gate 8. Thus, since the inverted information of the channel on a mounted side is inserted to the channel on a dismounted side, the mark ratio of data after multiplexing goes to 1/2, and it is possible to perform the extraction of the clock at a receiving part in the same manner as in the multiplexing of the two channels.
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