| 摘要 |
PURPOSE: An SOHO(Small Office Home Office) router interface unit is provided to interwork with a data line terminating equipment using an X.21 interface without changing hardware by transforming a signal line connecting method. CONSTITUTION: A data signal matching unit(31) connects a positive phase and reverse phase transmission/reception data signal lines to corresponding positive phase and reverse phase transmission/reception data signal lines of a data line terminating equipment. A clock signal matching unit(32) connects a positive phase and reverse phase transmission/reception clock signal lines to corresponding positive phase and reverse phase transmission/reception clock signal lines of the data line terminating equipment. A control signal matching unit(33) connects a data transmission request signal line to a reverse phase control signal line of the data line terminating equipment and at the same time to its own data transmission approval signal line, connects a ground signal line to a ground signal line and a positive phase control signal line of the data line terminating equipment, connects a line state monitoring signal line to a reverse phase line state indication signal line of the data line terminating equipment, and connects its normal operation report signal line to its normal operation monitoring signal line.
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