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1. (WO2017168550) COMMUNICATION ADAPTER DEVICE, DATA COMMUNICATION SYSTEM, AND DATA COMMUNICATION METHOD

Pub. No.:    WO/2017/168550    International Application No.:    PCT/JP2016/060057
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Wed Mar 30 01:59:59 CEST 2016
IPC: H04M 11/00
Applicants: MITSUBISHI ELECTRIC BUILDING TECHNO-SERVICE CO., LTD.
三菱電機ビルテクノサービス株式会社
MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: WATANABE, Akihiko
渡邊 明彦
Title: COMMUNICATION ADAPTER DEVICE, DATA COMMUNICATION SYSTEM, AND DATA COMMUNICATION METHOD
Abstract:
Provided is a communication adapter device that is connected to a circuit-switching monitoring device and can communicate using other means if data communication is lost. The communication adapter device comprises a packet processing unit that converts an analog audio signal from the monitoring device into packets and converts packets from a monitoring center into an analog audio signal; a PB signal identification unit that identifies a PB signal, which is included in the analog audio signal and which indicates the end of communication; a control unit that determines communication a success once the PB signal identification unit has identified the PB signal, and stands by for a prescribed fixed amount of time if the line is cut off with no PB signal having been identified; and a message transmission unit that transmits a message to the monitoring center to announce that communication between the monitoring device and the monitoring center has been lost if no transmission has been sent or received after the control unit has stood by for the fixed amount of time.