JP2007150763A - Optical communication system and optical communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote diffusion of FTTH by eliminating the need for routing an optical fiber cable at the time of introduction of the FTTH, improving working efficiency at the time of the introduction of the FTTH, and reducing costs by using a metallic line such as a telephone line or the like previously wired in an existing residence. <P>SOLUTION: The optical communication system uses the optical fiber cable GE-PON12 which is set outside the house from an accommodation station 1 through a feeder point 9, a circuit switch 13 which converts optical signals transmitted or received by the GE-PON12 into electrical signals outside, an incoming line 14 which is a metal line wired from outside to the inside and carrying electrical signals, and a modem 55 for VDSL which is connected with the incoming line 14 inside the house and transmits and receives electrical signals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical communication system and an optical communication method using an optical fiber cable such as FTTH (Fiber To The Home).

  In recent years, there has been a further increase in demand for high-speed broadband services, and the introduction of so-called FTTH, an Internet connection service that uses optical fiber cables, is replacing the conventional metal lines.

  Conventionally, the end face exposed to the outside of an optical fiber cable is easily damaged, and when it is wired, it cannot be used as it is at the time of shipment from the factory. After attaching the connector to the optical fiber core in the field, the end face of the connector It was necessary to perform operations such as polishing with high precision. This polishing work requires advanced technology and takes time, so the labor cost of workers who can handle the fiber optic cable wiring and the increase in construction cost due to the reduction in work efficiency are problems. This is an obstacle to promoting the spread of optical fiber cables.

  Therefore, recently, the number of cases in which optical fiber cables are pre-wired at the time of new housing construction is increasing. As such an optical fiber cable wiring method at the time of new housing construction, there is a technique disclosed in Patent Document 1. According to the technique disclosed in this gazette, in order to route the optical fiber cable in the building, one end of the optical fiber cable is preliminarily treated with a connector, so that no on-site polishing work or the like is required, Pre-wiring of optical fiber cables can be easily performed without tools or skill.

On the other hand, in existing houses, telephone cables, TV cables, electrical cords, etc. are pre-wired, but the current situation is that optical fiber cables are not installed. For this reason, in order to introduce optical fiber cables in existing houses, the optical cables suspended from utility poles close to the houses are branched, and the branched optical cables (drop cables) are used as telephone line lead-in sheaths or air conditioner ducts. The method of drawing in the inside of the house through the gap between the inlets and connecting to terminal devices such as terminal adapters and modems installed in the house is adopted.
JP 2005-189531 A

  However, in the above-described existing optical fiber cable wiring method in existing houses, it is necessary to route the optical fiber cable to the telephone wire drawing sheath or air conditioning duct drawing port, and there is no sheath or drawing port. However, there is a problem that it takes a long time to open a hole for insertion in the outer wall of the building.

  Therefore, the present invention has been made in view of the above points, using a metal line such as a telephone line that has been pre-wired to an existing house, eliminates the need for an optical fiber cable routing work when FTTH is introduced, It is an object of the present invention to provide an optical communication system and an optical communication method that can contribute to the promotion of the spread of FTTH by improving the work efficiency at the time of introduction and reducing the cost.

  In order to solve the above-described problems, in the optical communication system and the optical communication method of the present invention, an optical signal that is laid outdoors and an optical signal that is transmitted and received by the optical fiber cable is transmitted outdoors through a feeder line from the accommodation station side. A signal converter that converts the signal to the outside, a metal wire that is wired from the outside to the inside of the room and through which an electric signal is passed, and a termination device that is connected to the metal line and sends and receives the electric signal indoors.

  And in this invention, the optical signal and electric signal which are transmitted / received with an optical fiber cable are mutually converted by the signal converter installed outdoors, and an electric signal is taken indoors through the metal wire wired from the outdoors to the indoor. Send and receive by the installed terminal equipment.

  According to the present invention, since an optical signal and an electric signal are mutually converted outdoors, and transmission / reception of the electric signal is performed through a metal wire wired from the outdoors to the indoors, it is already wired in the building. Optical communication can be introduced using a metal line such as a telephone line.

  In the above invention, it is preferable that the electrical signal converted by the signal converter is transmitted / received by the XDSL system, and the terminating device is a modem that mutually converts the electrical signal by the XDSL system and the digital signal.

  Further, in the above invention, an emergency breaking means for transmitting information on disasters such as earthquakes is connected to an optical fiber cable laid outdoors, and an emergency signaling means is transmitted to an outdoor signal converter or an indoor terminal device. Output means for outputting the information to be output may be connected.

  In such a case, disasters such as earthquakes can be promptly notified to residents in and outside using the optical communication system described above, and damage due to the disaster can be minimized.

  As described above, according to the present invention, by using a metal line such as a telephone line that has been pre-wired to an existing house, the work of routing the optical fiber cable at the time of introducing FTTH can be made unnecessary. It is possible to improve work efficiency when introducing FTTH, reduce costs, and promote the spread of FTTH.

(Configuration of optical communication system)
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of the optical communication system according to the present embodiment.

  As shown in the figure, the optical communication system according to the present embodiment includes a media converter 7 installed in the station building of the accommodating station 1, a station side concentrator 3 installed in the vicinity of the subscriber house 2, and a station GE-PON (GigaEther-Passive Optical Network) 12 installed in a predetermined area from the side line concentrator 3 via the distributor 22 and a line switch 13 for branching the lead-in line 14 from the GE-PON 12 .

  The media converter 7 is a device that connects different transmission media (for example, an optical fiber and a copper cable) and converts signals to each other. In this embodiment, the media converter 7 performs mutual conversion between an electric signal and an optical signal, and a fiber cable. The optical signal is transmitted to and received from the station side concentrator 3 through 4 and the feeder 9. In the present embodiment, the fiber cable 4 is buried underground from the station building to the feeder line 9, led out to the ground at the feeder line 9, and connected to the station-side concentrator 3. Further, in the present embodiment, the fiber cable 4 connected to the station side concentrator 3 is a so-called dark fiber that is not operating after laying, and uses a line that is leased based on a contract between communication carriers.

  The GE-PON 12 is a fiber cable of an overhead line system that is connected to the station side concentrator 3 on the ground and is suspended from the distributor 22 to the utility poles 21, 21 and the like. In the GE-PON 12, a control signal specific to the station side concentrator 3 is periodically transmitted from the station side concentrator 3 to the subscriber side node device, and the subscriber node device responding to the control signal On the other hand, a time slot and TagID for data transmission are set, and communication is performed for each node device based on the time slot and TagID.

  The line switch 13 is a signal converter that converts an optical signal transmitted and received by the GE-PON 12 into an electric signal outdoors. In the present embodiment, the line switch 13 mutually converts an optical signal and an XDSL signal. Specifically, as shown in FIG. 2, the line switching unit 13 includes an optical connection unit 13a, a service line connection unit 13b, a power supply unit 13c, an arrester unit 13d, a line card unit 13e, and a conversion unit 13f. I have.

  The optical connection unit 13a is a terminal to which a branch line branched from the GE-PON 12 via a splitter is connected, and is connected to the conversion unit 13f on the other side. The lead-in wire connection portion 13b is a terminal connected to the lead-in wire 14 that is a metal wire, and is connected to the conversion portion 13f on the other side.

  The power supply unit 13c is a device that supplies power to each device from a power storage unit such as a battery. The power supply unit 13c receives power from a power line 13g connected from the outside of the device body and stores the power in the battery.

  The arrester unit 13d is a protective device (lightning arrester) that protects each part from momentary overvoltage (inducted lightning surge) that is induced in the distribution line and communication / signal line by lightning strikes. The current due to overvoltage (inducted lightning surge) is shunted between the ground and wires to limit overvoltage, protect electronic devices and equipment, and restore the electrical circuit to normal.

  The conversion unit 13f is a module that converts an optical signal into an electrical signal. In the present embodiment, the optical signal and a VDSL (Very High-Bit-Rate Digital Subscriber Line) system electrical signal are converted into an optical signal. Are transmitted / received to / from the optical connection portion 13a, and electrical signals are transmitted / received to / from the lead-in wire connection portion 13b. The line switcher 13 includes a control module that executes Telnet, SNMP monitoring, local monitoring, and remote (in-band) monitoring in addition to the above modules.

  On the subscriber's home 2 side, as shown in FIG. 3, a VDSL system signal is transmitted and received through the service line 14 from the line switch 13. Specifically, the service line 14 from the line switching machine 13 is connected to a telephone line 52 wired in the subscriber house 2 through a service port 51 installed outside the subscriber house 2. The telephone line 52 is usually a metal wire wired in the house, and is wired to the modular jack 53 installed on the wall surface in the subscriber house 2. For example, a VDSL modem 55 is connected to the modular jack 53 via a telephone line 54, and a PC 58 a is connected to the modem 55 via a LAN cable 56, and a telephone 58 b is connected to the modem 55.

  The lead-in line 14 enables communication using a pair of telephone lines (VDSL), and data is transmitted using a frequency band for transmitting telephone voice and a high frequency band not used for voice transmission. In this embodiment, the communication speed of the downlink used for downloading and the uplink used for uploading are both 100 Mbps.

(Optical communication method)
By operating the optical communication system having the above configuration, the optical communication method of the present invention can be implemented. Here, a case where signal transmission / reception is performed in the subscriber house 2 will be described as an example.

  First, the downlink will be described. On the downlink, an optical signal for downlink is transmitted from the media converter 7 of the accommodating station 1, and is received by the station side concentrator 3 via the feeder line 9. This optical signal is distributed to each GE-PON 12 by the distributor 22.

  Then, in the line switching unit 13 installed on the GE-PON 12, the optical signal is converted into a VDSL electrical signal, and the VDSL modem 55 in the subscriber home 2 passes through the lead-in line 14 of the subscriber home 2. Is received as an electrical signal.

  Next, the uplink will be described. In the downlink, the signal from the PC 58a and the telephone 58b in the subscriber's house 2 is converted into an electrical signal by the VDSL modem 55, and this electrical signal is switched over to the GE-PON 12 via the lead-in line 14. Sent to the machine 13. Then, the electrical signal is converted into an optical signal in the line switching unit 13 and concentrated to the station side line concentrator 3 through the GE-PON 12. Thereafter, the signal is sent from the media converter 7 to the accommodating station 1 via the feeder line 9.

(Operations and effects according to the embodiment)
According to the optical communication system and the optical communication method according to the present embodiment described above, an optical signal and an electric signal are mutually converted in the outdoor line switching unit 13, and transmission / reception of the electric signal is wired from the outdoor to the indoor. Therefore, optical communication can be introduced using a metal line such as a telephone line already wired in the building.

(Example of change)
The optical communication system and the optical communication method described above can be applied to a disaster prevention network system.

  More specifically, in the above-described embodiment, a disaster prevention center (not shown) is connected to the communication network constructed by the GE-PON 12 as emergency warning means for transmitting information on disasters such as earthquakes. In addition, the line switcher 13 and the indoor VDSL modem 55 are connected with speakers, sirens as output means for outputting information transmitted from the disaster prevention center, mobile phone base stations, and wireless meshes (communication networks) as communication means. To do. Furthermore, the line switch 13 may be attached with a Web camera or a microphone as information transmission means to acquire the disaster occurrence status and transmit it to the disaster prevention center through the GE-PON 12.

  In addition, this GE-PON12 is connected to an elevator control device, hospital, transportation information center, etc., and based on the disaster occurrence information, the operation of the elevator is stopped or the occurrence of a disaster is notified to the hospital or transportation. In addition, a process for securing the power supply may be executed.

  According to such a modified example, it is possible to promptly notify indoor and outdoor residents of disasters such as earthquakes using the optical communication system described above, and to collect the damage situation of each place. Can be minimized.

  Specifically, through the disaster prevention network system, as shown in Figures 4 (a) and (b), disaster information such as emergency earthquake warnings using the difference in propagation speed between P waves and S waves caused by earthquakes is provided. . In other words, when there is a distance from the epicenter, the difference between the detection time of the P wave and the arrival time of the S wave reaches several seconds to several tens of seconds. It will be possible to inform in advance whether will arrive. As a result, the initial action of disaster prevention and mitigation measures can be started before the mainshock arrives, and the damage that occurs can be reduced.

It is explanatory drawing which shows schematic structure of the optical communication system which concerns on embodiment. 3 is a perspective view showing an internal configuration of a line switching machine 13 according to an embodiment. FIG. FIG. 3 is an explanatory diagram showing a schematic configuration in a subscriber house 2 according to the embodiment. It is explanatory drawing of the emergency earthquake bulletin which concerns on embodiment.

Explanation of symbols

1 ... Containment Bureau
2… Subscriber's house
3 ... Station side concentrator
4 ... fiber cable
7… Media Converter
9 ... Cutting point
12… GE-PON
13 ... Line switching machine
13a: Optical connection
13b ... Lead-in wire connection
13c… Power supply
13d… Arresta
13e… Line card section
13f… Conversion unit
13g ... Power line
14 ... Lead-in wire
21, 21 ... telephone pole
22 ... Distributor
51 ... Inlet
52, 54 ... Telephone line
53 ... Modular jack
55 ... VDSL modem
57 ... LAN cable
58a ... PC
58b ... Telephone

Claims (8)

An optical fiber cable laid outside through the feeder line from the containment station side,
A signal converter for converting an optical signal transmitted and received by the optical fiber cable into an electric signal in the outdoors;
A metal wire that is wired from outside to indoors and is energized with the electrical signal;
An optical communication system comprising: a terminating device that is connected to the metal wire and transmits and receives the electrical signal indoors. The electrical signal converted in the signal converter is transmitted and received by the XDSL system,
2. The optical communication system according to claim 1, wherein the terminator is a modem that mutually converts an electric signal based on an XDSL system and a digital signal. The optical fiber cable laid outdoors is connected to an emergency breaking means for transmitting information on disasters such as earthquakes,
2. The optical communication system according to claim 1, wherein output means for outputting information transmitted from the emergency warning means is connected to the signal converter. The optical fiber cable laid outdoors is connected to an emergency breaking means for transmitting information on disasters such as earthquakes,
2. The optical communication system according to claim 1, wherein output means for outputting information transmitted from the emergency bulletin means is connected to the indoor terminal device. An optical signal transmitted and received by an optical fiber cable laid outdoors through a feeder line from the containment station side, and an electrical signal, and a step (1) for mutual conversion by the signal converter installed outdoors,
And a step (2) of transmitting and receiving the electrical signal through a termination device installed indoors through a metal wire wired from outside to indoors. In the step (1), the electrical signal converted by the signal converter is transmitted and received by the XDSL system,
6. The optical communication method according to claim 5, wherein the terminating device in the step (2) mutually converts an electric signal based on an XDSL system and a digital signal. In the step (1), information on disasters such as earthquakes is transmitted from the emergency early warning means through the optical fiber cable laid outdoors,
6. The optical communication method according to claim 5, wherein the information is output outdoors by an output unit connected to the signal converter. In the step (1), information on disasters such as earthquakes is transmitted from the emergency early warning means through the optical fiber cable laid outdoors,
6. The optical communication method according to claim 5, wherein in the step (2), the information is output indoors by an output unit connected to the termination device.

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