JP2006129034A - Emergency alarm broadcasting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To designate a specific region or building to transmit an emergency alert broadcast by utilizing a PON system. <P>SOLUTION: Emergency broadcasting terminals 30-1 to 30-n are installed in individual subscribers' houses, and an optical transmission device 16 for communicating respective emergency broadcasting terminals and an emergency broadcast information management server 18 are installed in a center station 10. Communication between an OLT 12 and ONUs 28-1 to 28-n and the emergency alert broadcast from the optical transmission device 16 to respective emergency broadcasting terminals 30-1 to 30-n are separated by wavelengths by WDM optical couplers 26-1 to 26-n of respective subscribers' houses and a WDM optical coupler 14 of the center station 10, and both of them share an optical fiber 20, an optical coupler 22, and an optical transmission line consisting of optical fibers 24-1 to 24-n. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a system that broadcasts an emergency alert for a specific area or building using a PON (Optical passive Network) system.

As emergency warning broadcasting systems, radio systems using radio broadcasting, television broadcasting, or regional radio are known. Patent Document 1 describes a technique for broadcasting an emergency alert on a cable television.
Japanese Patent Laid-Open No. 2002-77847

  However, a special receiver is required for emergency warning broadcasts using television broadcast waves or radio broadcast waves. Moreover, the emergency alert broadcast by CATV can be used only by the user who has subscribed to the CATV.

  In the future, it is considered that a passive optical network (PON) system using an optical fiber will become mainstream due to the development of optical communication / broadcasting technology. In the future, TV broadcasts will also be viewed via optical fiber.

  Then, it is considered that the number of households that do not use the TV receiving antenna and CATV is increased, and means for placing an emergency warning method on the PON system is required.

  Also, in the wireless system, it is difficult to distribute information only to a specific area or a specific building.

  An object of the present invention is to present an emergency warning broadcasting system that solves such problems.

  The emergency alert broadcasting system according to the present invention optically connects the OLT of the center station, the ONU of each subscriber house, the OLT of the center station and the ONU of each subscriber house, and is shared by each subscriber. And an optical transmission system in which downlink signal light having a first wavelength and uplink signal light having a second wavelength propagate on the optical transmission line. Each subscriber's home is supplied with an emergency broadcast terminal receiving an emergency alert broadcast addressed to itself and an emergency alert broadcast signal light having a third wavelength from the optical transmission path to the emergency broadcast terminal. A first WDM optical coupler is provided that supplies downstream signal light from the transmission path to the ONU and supplies upstream signal light from the ONU to the optical transmission path. The center station is an emergency broadcast information management server for storing the location of the emergency broadcast terminal of each subscriber's house, and the emergency broadcast terminal belonging to a specific area or building within the emergency broadcast terminal An emergency broadcast information management server that outputs an emergency alert broadcast signal designating as a destination, an optical transmitter that converts the emergency alert broadcast signal from the emergency broadcast information management server into emergency alert broadcast signal light, and the optical transmission line The upstream signal light from the OLT is supplied to the OLT, the emergency warning broadcast signal light of the optical transmitter is supplied to the optical transmission line, and the downstream signal light output from the OLT is supplied to the optical transmission line. A second WDM optical coupler is installed.

  According to the present invention, an emergency alert can be transmitted to a specific subscriber of the PON system without disturbing existing communication.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic block diagram of an embodiment of the present invention. In this embodiment, emergency broadcast terminals 30-1 to 30-n are arranged in each subscriber house of the PON (Optical passive Network) system, and the emergency broadcast terminals 30-1 to 30-n are managed in the center station. Then, an emergency broadcast information management server 18 for holding information to be emergency broadcasted is provided, and on the optical transmission path of the PON system, an emergency alert broadcast is transmitted to each subscriber at a wavelength different from the signal transmission of the PON system. As a result, the signal transmission of the PON system and the emergency alert broadcast can be operated in a state of being separated from each other.

  The configuration and operation of FIG. 1 will be specifically described. In the center station 10, in addition to an OLT (Optical Line Terminal) 12 which is an optical termination device on the center side of the PON system, a WDM optical coupler 14, an emergency broadcast optical transmitter 16 and an emergency broadcast information management server 18 are installed. The

  The emergency broadcast information management server 18 holds information indicating the installation positions of the emergency broadcast terminals 30-1 to 30-n, that is, information indicating the address of each subscriber. When the emergency alert information designating the area or building is received from the external network, the server 18 generates an emergency alert information signal designating the designated area or building as the destination and applies the emergency alert information signal to the emergency broadcast optical transmitter 16. . The destination added to the emergency alert information signal is an address or identification information (ID) that specifies an emergency broadcast terminal installed in each subscriber's house. The emergency broadcast optical transmitter 16 converts the emergency alert information signal from the server 18 into an optical signal having a wavelength λ3 and applies it to the WDM optical coupler 14.

  The WDM optical coupler 14 outputs the downstream signal light having the wavelength λ1 output from the OLT 12 to the optical fiber 20 with respect to the upstream signal light and the downstream signal light in the original data communication of the PON system, and the wavelength λ2 from the optical fiber 20. The upstream signal light is supplied to the OLT 12. The WDM optical coupler 14 also supplies the optical fiber 20 with the signal light of the emergency broadcast information having the wavelength λ3 output from the emergency broadcast optical transmitter 16. The wavelengths λ1, λ2, and λ3 are different from each other.

  The WDM optical coupler 14 multiplexes the downstream signal light from the OLT 12 and the control signal light from the emergency broadcast optical transmitter 16 on the wavelength axis, and outputs the multiplexed signal light to the optical fiber 20.

  The optical fiber 20 is connected to the optical coupler 22. The optical coupler 22 is a 1: n optical splitter that divides the input light from the optical fiber 20 into n parts and outputs the divided lights to the optical fibers 24-1 to 24-n without depending on the wavelength. The optical coupler 22 also outputs light from the optical fibers 24-1 to 24-n to the optical fiber 20 without depending on the wavelength. Therefore, the optical coupler 22 supplies the downstream signal light from the optical fiber 20 and the signal light of the emergency warning broadcast to each of the optical fibers 24-1 to 24-n.

  The other ends of the optical fibers 24-1 to 24-n are connected to WDM optical couplers 26-1 to 26-n that separate data communication using wavelengths λ1 and λ2 and broadcasting using wavelength λ3. The WDM optical couplers 26-1 to 26-n receive ONUs (Optical Network Units) 28-1 to 28-, which are optical termination devices on the user side, from the downstream signal light having the wavelength λ1 from the optical fibers 24-1 to 24-n. n is supplied to the emergency broadcast terminals 30-1 to 30-n with the signal light of the emergency warning broadcast having the wavelength λ3 from the optical fibers 24-1 to 24-n.

  The emergency broadcast terminals 30-1 to 30-n check whether or not the signal light of the emergency warning broadcast from the WDM optical couplers 26-1 to 26-n is addressed to itself, Capture, audio and / or output on screen. Each of the emergency broadcast terminals 30-1 to 30-n is always waiting to receive such emergency warning broadcast signal light. The emergency broadcast terminals 30-1 to 30-n also monitor whether or not an emergency warning broadcast signal light is input in a normal state. You may make it start an apparatus part and the apparatus part which displays the content of emergency alert broadcast sequentially.

  The ONUs 28-1 to 28-n receive downstream signal light from the WDM optical couplers 26-1 to 26-n, convert them into electrical signals, and supply the electrical signals to the terminals 32-1 to 32-n. Thereby, each terminal 32-1 to 32-n can receive a signal from a network located upstream of the OLT 12. Of course, the ONUs 28-1 to 28-n capture only the signal addressed to itself and the signal addressed to the subordinate user apparatus from the downstream signal light.

  The ONUs 28-1 to 28-n also convert the upstream signals from the terminals 32-1 to 32-n into optical signals, that is, upstream signals with a wavelength of λ2, and send them to the WDM optical couplers 26-1 to 26-n. Supply. The WDM optical couplers 26-1 to 26-n output the upstream signal light having the wavelength λ2 from the ONUs 28-1 to 28-n to the optical fibers 24-1 to 24-n.

  The WDM optical couplers 26-1 to 26-n output the upstream signal light from the ONUs 28-1 to 28-n to the optical fibers 24-1 to 24-n. The upstream signal light of each subscriber is transmitted through the optical fibers 24-1 to 24-n, the optical coupler 22, and the optical fiber 20, and enters the WDM optical coupler 14. Of course, each ONU 28-1 to 28-n outputs the upstream signal light at different timings so as not to collide with each other on the optical transmission line composed of the optical fiber 20, the optical coupler 22, and the optical fibers 24-1 to 24-n. .

  The WDM optical coupler 14 supplies the upstream signal light having the wavelength λ 2 from the optical fiber 20 to the OLT 12. The OLT 12 receives the upstream signal light from the WDM optical coupler 14 and outputs the upstream signal to an upper network. Of course, when the upstream signal is addressed to the OLT 12, the OLT 12 operates according to the content of the upstream signal.

  Although the invention has been described with reference to specific illustrative embodiments, various modifications and alterations may be made to the above-described embodiments without departing from the scope of the invention as defined in the claims. This is obvious to an engineer in the field to which the present invention belongs, and such changes and modifications are also included in the technical scope of the present invention.

It is a schematic block diagram of one Example of this invention.

Explanation of symbols

10: Center station 12: OLT
14: WDM optical coupler 16: emergency broadcast optical transmitter 18: emergency broadcast information management server 20: optical fiber 22: optical couplers 24-1 to 24-n: optical fibers 26-1 to 26-n: WDM optical coupler 28 -1 to 28-n: ONU
30-1 to 30-n: emergency broadcast terminals 32-1 to 32-n: terminals

Claims (2)

Center station OLT (12), ONU (28-1 to 28-n) of each subscriber house, Center station OLT (12) and ONU (28-1 to 28-n) of each subscriber house And optical transmission lines (20, 22, 24-1 to 24-n) shared by each subscriber, and the downstream signal light having the first wavelength and the first wavelength are transmitted on the optical transmission line. In an optical transmission system in which upstream signal light having a wavelength of 2 propagates,
Each subscriber's house receives an emergency broadcast terminal (30-1 to 30-n) that receives an emergency alert broadcast addressed to itself and an emergency alert broadcast signal light having a third wavelength from the optical transmission line. A first WDM optical coupler (26-1 to 26) that supplies the emergency broadcast terminal, supplies the downstream signal light from the optical transmission path to the ONU, and supplies the upstream signal light from the ONU to the optical transmission path. -N),
The center station includes an emergency broadcast information management server (18) that stores the location of the emergency broadcast terminals (30-1 to 30-n) of the subscriber homes. An emergency broadcast information management server (18) that outputs an emergency alert broadcast signal that designates an emergency broadcast terminal belonging to a specific area or building as a destination, and the emergency alert broadcast signal from the emergency broadcast information management server (18) is emergency An optical transmission device (16) for converting into an alarm broadcast signal light, an upstream signal light from the optical transmission line is supplied to the OLT (12), and an emergency warning broadcast signal light of the optical transmission device (16) is supplied An emergency warning broadcasting system, characterized in that a second WDM optical coupler (14) for supplying the downstream signal light supplied to the optical transmission line and output from the OLT (12) to the optical transmission line is installed. The emergency alert broadcast system according to claim 1, wherein the emergency broadcast terminals (30-1 to 30-n) are forced to shift from a standby state to an activated state by external control.

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