| 摘要 |
PROBLEM TO BE SOLVED: To provide a data communication system wherein an existing terminal network control apparatus can be usable even when a communication line is changed from an analog line into a digital line. SOLUTION: A digital terminal network control apparatus 10 connected to a digital line 9 is connected to a control terminal 7a of an analog terminal network control apparatus 1. The analog terminal network control apparatus 1 recognizes that the digital terminal network control apparatus 10 is connected to the connection terminal 7a by means of transmission/reception of a data signal through a terminal interface 6a. The analog terminal network control apparatus 1 transmits data to a center side apparatus via the digital terminal network control apparatus 10. COPYRIGHT: (C)2006,JPO&NCIPI
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