Patent ID: 8134925
Filing Date: 2012-03-13
Classification: G08B,H04L

Abstract:
1. A disaster prevention system, comprising: a LAN; and a plurality of terminal devices connected to one another via said LAN and including at least one fire receiver, each of said plurality of terminal devices comprising: a main control portion for performing operational control; and a transmission LAN unit for performing transmission control regarding transmission and reception of disaster prevention information; said transmission LAN unit comprises: a transmitting and receiving circuit directly connected to said main control portion; a transmission control portion for performing communication control; and an arrival order determining and retransmitting circuit portion connected to said transmission control portion and to at least three of transmitting and receiving ports which are capable of connecting to said LAN, wherein each of said transmitting and receiving ports includes at least one input port and at least one output port; when a signal relating to the disaster prevention information is inputted to one of said transmitting and receiving ports, said one of said transmitting and receiving ports outputs the signal to the arrival order determining and retransmitting circuit portion via the output port of said one of said transmitting and receiving ports, and the arrival order determining and retransmitting circuit portion substantially simultaneously (i) closes the input port of said one of said transmitting and receiving ports, (ii) closes the output ports of said transmitting and receiving ports other than said one of said transmitting and receiving ports, and (iii) sends the signal to said transmitting and receiving ports other than said one of said transmitting and receiving ports, via the input ports of said transmitting and receiving ports other than said one of said transmitting and receiving ports.