| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication unit connection changeover device, that has a display function by which whether or not an R terminal connection terminal and an S/T terminal connection terminal are available can be recognized at a glance. SOLUTION: This communication unit connection changeover device has an R-terminal light emitting diode LED1, that displays it that an R-terminal connection terminal 31A is available, when a common input terminal 32 is connected to an analog public line terminal function section 33 by a line network connection interface selection section 40 and has an S/T-terminal light emitting diode LED2, that causes it to display so that an S/T terminal connection terminal is available, when the common input terminal 32 is connected to a DSU 42 by the line network connection interface selection section 40.
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