Title:
ORDER WIRE COMMUNICATION SYSTEM AND COMMUNICATION FAULT DETECTING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3583090
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To find a communication fault in an order wire communication system at an early stage.
SOLUTION: An order wire communication system in which order wire communications are made between a plurality of transmission devices 21-26 is provided with a connection monitoring sections 21A and 26A, for making each of the devices 21 and 26 on both end of the system call each of the other devices 22-25 other than the devices on both ends by DTMF(Dual Tone multi- frequency) signals of intrinsic numbers, and transmitting a DTMF signal of a fault monitoring number and a voice signal for testing periodically; and responding section 22B-25B for giving a reply of reception to the sections 21A and 26A upon receiving the DTMF signal of the fault monitoring number, and transmitting a DTMF signal for determining whether or not voice reproduction of the voice signal for testing are normally performed.
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Inventors:
Sho Ohno
Application Number:
JP2001247432A
Publication Date:
October 27, 2004
Filing Date:
August 16, 2001
Export Citation:
Assignee:
NEC Communication Systems, Ltd.
International Classes:
H04L12/28; H04B3/46; H04L12/42; H04L69/40; H04M3/00; (IPC1-7): H04L12/28; H04B3/46; H04L12/42; H04L29/14; H04M3/00
Domestic Patent References:
| JP955798A | ||||
| JP8181708A | ||||
| JP200124789A | ||||
| JP2164166A | ||||
| JP63119338A |
Attorney, Agent or Firm:
Yuichiro Asano
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