| 摘要 |
PROBLEM TO BE SOLVED: To provide a superior data transmission unit which suppresses alarms when a data signal input terminal is extracted, inserted, or switched. SOLUTION: When it is not informed by an alarm output suppressing means 14 that this data transmission unit is operated in the operation mode informed by an operation mode setting means 13, this unit outputs an alarm issuing signal from an alarm issuing and outputting means 12 to an alarm output terminal 15 and, when it is informed, does not output the alarm issuing signal from the means 12 to the output terminal 15.
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