Disaster prevention system
First Claim
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,whereineach 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, andthe 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.
1 Assignment
0 Petitions
Accused Products
Abstract
Each terminal devices (1, 4) connected to one another via a LAN (11) includes: a main control portion (e.g. 31) performing operational control, a transmission LAN unit (34) performing transmission control regarding transmission and reception of disaster prevention information. The unit (34) includes: a transmitting and receiving circuit (36) connected to the portion (31); a transmission control portion (35) performing communication control; an arrival order determining and retransmitting circuit portion (37) connected to the portion (35) and to at least three of transmitting and receiving ports (38) which are capable of connecting to the LAN. Upon receiving an incoming signal of disaster prevention information from one of the portion (35) and the ports (38), the portion (37) outputs the received signal to the rest of them while shutting out for a predetermined period of time an incoming signal from the rest of the ports (38) that has sent the signal.
18 Citations
14 Claims
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1. A disaster prevention system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification