| 摘要 |
PURPOSE: A method and a system for network multiple connections are provided to make an operation data transceiving failure rate into zero. CONSTITUTION: A DTMF(Dual Tone Multi Frequency) transceiver(82) informs transceiving or failing operation information data by an DTMF signal between a local system and a host when data communication while a communication modem is failed. Communication control devices(56,87) are included in the local system and the host. Each communication control devices performs a communication mode switching function with at least one communication mode between a DTMF mode due to the DMTF transceiver and a communication modem mode due to the communication modem.
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