JP5345872B2 - High speed communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an FTTH service without bringing an optical fiber cable into each house, even in a residental street etc. without utility poles. <P>SOLUTION: The high-speed communication system performs power line communications (PLC) utilizing a power line which supplies power to a house 18. Each of the houses is located in an area without utility poles, where a buried composite power cable 15 and a buried service conductor 17 are used as a power cable. Power is supplied to each of the house through a substation, a pole-mounted transformer 11, and a pole-mounted low voltage branch box 12, at least between the pole-mounted transformer and the pole-mounted low voltage branch box is connected by the buried composite power cable, each of the houses is connected by a buried service conductor from the pole-mounted low voltage branch box. An optical cable 13 is equipped in the buried composite power cable, a PLC converter 16 for performing the power line communications is equipped in the pole-mounted low voltage branch box, the power line communication is performed by connecting the optical fiber cable to the PLC converter, and at the same time, the buried service conductor is connected. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a high-speed communication system using an optical fiber cable, and more particularly to a power line communication (PLC) system for use in FTTH (Fiber To The Home) which is a data communication service using an optical fiber cable. About.

  In order to perform large-capacity data communication using the Internet, for example, an FTTH service for drawing an optical fiber cable into a general household is becoming widespread. When performing the FTTH service, generally, an optical fiber cable laid on a utility pole or the like is branched, the optical fiber cable is drawn into a general household, and the drawn optical fiber cable is connected to a terminal such as a personal computer via a media converter. Connect to the device.

  By the way, in recent years, so-called non-electric poles have been developed in urban areas due to aesthetic needs. For example, when non-electric poles are made in a large residential area, there is no utility pole, so an optical fiber cable is installed. In some cases, the FTTH service cannot be performed.

  On the other hand, there is known a power line carrier communication system that performs communication by superimposing a high frequency signal on a power line (low voltage distribution line) without drawing an optical fiber cable into a general home. In this power line carrier communication system, for example, an optical fiber cable is used for communication from the pole transformer to the user, and a low voltage distribution line is used for communication from the pole transformer to the user. When the user receives the signal, the low-voltage side (secondary) of the pole transformer is connected to the PLC transformer on the pole and the junction box of the optical fiber cable. The high-frequency signal is superimposed on the side, and the high-frequency signal is extracted by a PLC modem connected to a home outlet via an outdoor low-voltage distribution line, a user house lead-in line, and a home wiring (for example, Patent Document 1). reference).

JP 2003-318786 A

  As described above, in a residential area or the like where the utility pole has been removed, power distribution to each house is performed using underground cables. However, between the low-pressure branch box on the road and each house, there is currently no fiber wiring conduit for burying the optical fiber cable or no space for wiring the optical fiber cable (that is, the low-pressure on the road) The current situation is that there is no room in the underground pipes or underground wiring pits from the branch box to each house). Therefore, in such a residential area, the FTTH service cannot be performed as described above.

  In particular, in existing residential areas where utility poles have been removed, there is no room for underground pipes or underground wiring pits from the low-voltage branch boxes on the road to each house, even if new needs for FTTH services arise. The current situation is that we cannot cope with that need.

  On the other hand, even if power line communication using low-voltage distribution lines is carried out without drawing the optical fiber cable into the house, there is no utility pole in the residential area where there is no power pole. It cannot be installed, and communication using a low-voltage distribution line is impossible.

  Therefore, an object of the present invention is to provide a high-speed communication system capable of providing FTTH service without drawing an optical fiber cable into each house even in a residential area or the like that is made into a non-electric pole.

  (1) The present invention is a high-speed communication system for performing power line carrier communication (PLC) using a power cable for supplying power to a house, wherein each of the houses is an embedded composite power cable and a power cable. Located in a poleless area using a buried service line, the power is supplied to each of the houses via a substation, a road transformer, and a road low voltage branch box, and at least the road transformer and the road low voltage branch box, Are connected by the embedded composite power cable, and each of the houses is connected from the low-voltage branch box on the road by the embedded lead-in line, the embedded composite power cable is provided with an optical fiber cable, and the low-voltage branch on the road The box is equipped with a PLC conversion device for performing the power line carrier communication, and when the optical fiber cable is connected to the PLC conversion device. Connect the buried lead-in wire to, it is characterized in that to perform the power line communication.

  In the high-speed communication system described in (1), using a buried composite power cable having an optical fiber cable as a power cable, a PLC converter is arranged in a low-pressure branch box on the road, and this PLC converter is connected to a buried lead-in line. Since it did in this way, FTTH service can be provided, without drawing in an optical fiber cable in each house also in a residential area etc. where it was made a utility pole.

  (2) In the high-speed communication system according to (1), the road low-pressure branch box includes a branch circuit that branches a power cable of the embedded composite power cable into a plurality of branch terminals, and the branch terminal Each of the embedded lead-in wires is connected to the PLC converter, and the PLC converter is connected to the branch circuit via a communication cable.

  In the high-speed communication system described in (2), the road low-pressure branch box has a branch circuit that branches the power cable of the embedded composite power cable into a plurality of branch terminals, and each of the embedded lead-in wires is connected to these branch terminals. Since the PLC converter is connected to the branch circuit via the communication cable, power line carrier communication can be performed in a plurality of houses by one PLC converter.

  (3) The present invention provides the high-speed communication system according to (2), wherein the PLC conversion device includes at least a photoelectric converter that performs photoelectric conversion and a PLC modem that performs the power line carrier communication. It is connected to the optical fiber cable, and the PLC modem is connected to the communication cable.

  In the high-speed communication system described in (3), the PLC conversion device has at least a photoelectric converter that performs photoelectric conversion and a PLC modem for performing power line carrier communication, and the photoelectric converter is connected to an optical fiber cable. If it connects with a communication cable, power line carrier communication can be easily performed in each house.

  (4) In the high-speed communication system according to any one of (1) to (3), the present invention is characterized in that the embedded lead-in wire is covered with a shield material.

  In the high-speed communication system described in (4), since the buried lead-in line is covered with the shield material, even if a high-frequency signal flows through the buried lead-in line, the surroundings are not adversely affected.

  (5) The present invention provides the high-speed communication system according to any one of (1) to (4), wherein each of the embedded lead wires is provided with a high-frequency cut filter that cuts a high-frequency component, and the power line carrier communication is performed. The high-frequency cut filter is removed from the buried lead-in line for the house contracted to be performed.

  In the high-speed communication system described in (5), each buried lead-in line is provided with a high-frequency cut filter that cuts high-frequency components, and the high-frequency cut filter is removed from the buried lead-in line for a house with a power line carrier communication contract. A house that does not have a contract does not carry out power line carrier communication without permission.

  As described above, according to the present invention, a buried composite power cable having an optical fiber cable is used as a power cable, the PLC converter is disposed in the low-voltage branch box on the road, and the PLC converter is connected to the buried lead-in line. Since it did in this way, there exists an effect that it can provide FTTH service, without drawing in an optical fiber cable to each house in the residential area made into the poleless.

It is a figure which shows roughly an example of the high-speed communication system by embodiment of this invention. In the high-speed communication system shown in FIG. 1, it is a figure which shows an example of the connection relation of a road transformer and a composite power cable. It is a figure which shows the external appearance of the road transformer used with the high-speed communication system shown in FIG. 1, (a) is a front view, (b) is a right view, (c) is a left view, (d) is a top view. It is. It is a figure which shows the inside of a road transformer used with the high-speed communication system shown in FIG. In the high-speed communication system shown in FIG. 1, it is a figure which shows an example of the connection relationship between a road low voltage | pressure branch box, a composite power cable, and each house. It is a figure which shows the inside of the road low voltage | pressure branch box used with the high-speed communication system shown in FIG. It is a figure which shows the external appearance of the road low voltage | pressure branch box 12 used with the high-speed communication system shown in FIG. 1, (a) is a front view, (b) is a side view, (c) is a top view.

  Hereinafter, an example of the high-speed communication system according to the embodiment of the present invention will be described.

  FIG. 1 is a diagram schematically showing an example of a high-speed communication system according to an embodiment of the present invention, where (a) shows a high-speed communication line together with a power system, and (b) shows a high-speed communication line (optical fiber cable). It is a figure which shows the system | strain of (). In FIG. 1, in a residential area where there is no power pole, generally, a distribution cable is buried in the ground. In such a residential area, road transformers 11 similar to pole transformers are arranged at various places in the residential area. For example, a substation (not shown) is connected to the ground transformer 11 in the ground. The 6,600-volt trunk line buried in is pulled down to 200 volts or 100 volts in the road transformer 11 and supplied to the road low-pressure branch box (low-voltage lead-in board) 12 via the 200/100 V distribution line. The In addition, the 6,600-volt trunk line (power cable) may be buried in the ground by being pulled down from the utility pole, for example, before reaching the aesthetic area, in addition to being buried in the ground and laid to the substation. Further, in FIG. 1, a closure and the like which will be described later are omitted.

  As will be described later, the road low-pressure branch box 12 is provided with a plurality of output terminal portions (power supply terminal portions), and each power supply terminal portion is connected to each house by a distribution line embedded in the ground. The power is supplied to each house.

  By the way, there is generally no allowance for the lead-in pipelines arranged between the road low-pressure branch box 12 and each house, and the power transmission pipelines arranged on the road between the substation and the road transformer 11 In general, so-called composite power cables are used because there is no allowance for the distribution pipelines disposed between the transformer 11 and the low-voltage branch box 12 on the road.

  In the illustrated example, a composite power cable 14 provided with an optical core wire (optical core wire is covered. That is, an optical fiber cable) 13 is used as the 6,600V trunk line (composite power cable). 14, a plurality of power cables are arranged), and a composite power cable 15 similarly having an optical fiber cable 13 is used as a 200 / 100V distribution line (a high-voltage (6,600V) RST phase from a substation) Since one of the feeders is twisted and is sent out, it is branched on the way and connected to the road transformer 11, so that the composite power cable 14 is provided with a plurality of power cables). As shown in the figure, the composite power cable 15 is connected to a power input terminal portion 12 a provided in the on-road low-pressure branch box 12.

  A PLC converter (including a media converter (electric / optical converter) and a router) 16 is disposed in the low-pressure branch box 12 on the road, and the optical fiber cable 13 of the composite power cable 15 is connected to the PLC converter 16. Are connected to the first input / output terminal portion 16a. A signal line cable 16 c is connected to the second input / output terminal portion 16 b of the PLC conversion device 16, and the signal line cable 16 c is connected to a plurality of power output terminal portions 12 b of the on-road low-pressure branch box 12.

  A lead-in line (power line (buried power cable)) 17 is connected to each power output terminal portion 12b, and each power line 17 is drawn into the house 18 through a lead-in conduit buried in the ground (note that The power line 17 is shielded by a shield material 17a). The power line 17 is connected to the home wiring via a distribution board or the like. In the house, a child PLC device (PLC modem) 19 is provided. When the child PLC device 19 is connected to a home outlet, and a personal computer is connected to the child PLC device 19, the personal computer is connected to the child PLC device 19, It is connected to the optical fiber cable 13 via the home wiring, the power line 17, and the PLC conversion device 16, and high-speed data transmission or the like can be performed via the optical fiber cable (via the Internet service provider). That is, it can be connected to the Internet.

  FIG. 2 is a diagram illustrating an example of a connection relationship between the road transformer 11 and the composite power cables 14 and 15, and FIG. 3 is a diagram illustrating an appearance of the road transformer 11. FIG. 4 is a diagram showing the inside of the road transformer 11.

  In FIG. 2, the composite power cable 14 is connected to the primary side of the road transformer 11 by a first attachment 21. As shown in the figure, first to third input terminals 22a to 22c are provided on the primary side of the road transformer 11 (hereinafter referred to as blue, white, and red phase terminals), and these blue, white, One power cable 14a of the composite power cable 14 is connected to the red phase end (in the illustrated example, the power cable 14a is connected only to the blue phase end, but another power cable is also connected to the other phase end. Connected).

  The blue, white, and red phase ends are connected to the transformer 24 of the road transformer 11 via high-voltage cutouts 23a to 23c, respectively. On the secondary side of the road transformer 11, first to fourth output terminals 25a to 25d are provided (hereinafter referred to as white, black, green and red terminals. One of them is a ground terminal. These white, black, green, and red terminals are connected to the transformer 24 via low-voltage limit fuses 26a to 26d, respectively.

  The power cable 15a of the composite power cable 15 is connected to each of the white, black, green, and red terminals (in the illustrated example, the power cable 15a is connected only to the white end terminal for convenience of explanation. To other power cables). The composite power cable 15 is connected to the secondary side of the road transformer 11 via the second attachment 27. As shown in the figure, the optical fiber cable 13 is drawn from the composite power cable 14 and reaches the composite power cable 15 by bypassing the transformer 24 in the road transformer 11.

  3, FIG. 3 (a) is a front view of the road transformer 11, FIG. 3 (b) is a right side view thereof, FIG. 3 (c) is a left side view, and FIG. 3 (d) is a top view. It is. The road transformer 11 is fixed on the ground surface with a foundation bolt 31 or the like. The road transformer 11 has a transformer casing 32, and a plurality of louvers 33a for ventilation are formed on the front surface thereof.

  Opening and closing doors 33 and 34 are respectively attached to the left and right side surfaces of the transformer casing 32. When the opening and closing doors 33 and 34 are opened, the high-pressure side (primary side) and the low-pressure side (secondary side) are exposed, respectively. . As shown in FIGS. 3B and 3C, keys 35 to 37 are provided on the doors 33 and 34, respectively.

  In FIG. 4, a switch 41 (not shown in FIG. 2) and a transformer section 24 are disposed in the transformer housing 32, and the power cable 14a of the composite power cable 14 embedded in the ground is It is connected to the primary side terminal part 22 (blue, white, red phase end). The primary-side terminal portion 22 is connected to the high-voltage cutout portion 23 (high-voltage cutouts 23a to 23c) via the switch 41 and then connected to the transformer portion 24.

  The transformer unit 24 is connected to the secondary terminal unit 25 (white, black, green, red terminal) via the low voltage limit fuse unit 26 (low voltage limit fuses 26a to 26d). The power cable 15a of the composite power cable 15 embedded in the ground is connected.

  The optical fiber cable 13 branched by the first attachment 21 reaches the second attachment 27 by a closure 42 in the ground and is accommodated in the composite power cable 15. In addition, when installing the closure 42 in the ground, in order to prevent inundation, naturally the closure which took the countermeasure against inundation is used. Further, it is desirable that the closure 42 be housed in the transformer housing 32 if there is room in the transformer housing 32.

  FIG. 5 is a diagram illustrating an example of a connection relationship between the road low-pressure branch box 12, the composite power cable 15, and each house, and FIG. 6 is a diagram illustrating the inside of the road low-pressure branch box 12. FIG. 7 is a view showing the appearance of the on-road low-pressure branch box 12.

  Referring to FIGS. 5 and 6, the road low-pressure branch box 12 has a lead-in cabinet 61, and the composite power cable 15 is connected to the road low-pressure branch box 12 by a third attachment 51 (road road). It will be connected to the power input terminal portion 12a of the low-pressure branch box 12). As shown in the figure, in the low-pressure branch box 12 on the road, as described above, the PLC conversion device 16 is disposed. The PLC conversion device 16 includes the PLC device (PLC modem) 52, the router 53, and the media. A converter 54 is provided, and the PLC device is sequentially mounted and added each time a contract is made. In the example of FIG. 6, a space is defined below the media converter 54, and this space is used as a surplus length processing unit for the optical fiber cable 13 to process the extra length of the optical fiber cable 13 or store a closure. Available to:

  The optical fiber cable 13 of the composite power cable 15 is branched by a third attachment 51, protected by a closure 71, inserted into the lead-in panel housing 61, and the medium by the first input / output terminal portion 16a. Connected to the converter 54 (the connection between the media converter and the optical fiber cable is a connector connection). The PLC converter 16 is connected to the signal line cable (power line) 16c by the second input / output terminal portion 16b. Specifically, in the closure 71, the coating of the optical fiber cable 13 is peeled off, and the optical core wires are fusion-connected. Therefore, the optical core wire coming out of the closure 71 is an optical fiber cable wrapped with a coating. Further, when the closure 71 is disposed in the ground, it is a matter of course that countermeasures against flooding are taken. However, if there is room in the low-pressure branch box 12 on the road, the closure 71 is connected to the low-pressure branch box 12 on the road. It is desirable to store in. For example, the closure 71 is preferably stored in the extra length processing unit 13a of the optical fiber cable 13.

  The on-road low-voltage branch box 12 has a branch line 55, and this branch line 55 is connected to the power input terminal portion 12 a through a fuse 56, and the power input terminal portion 12 a has a power cable 15 a of the composite power cable 15. Will be connected. The branch line 55 is connected to each of the power output terminal portions 12b, and a lead-in line (power line) 17 is connected to each of the power output terminal portions 12b. The signal line cable 16c is connected to the branch line 55 described above. The illustrated example is an example having eight power output terminal portions 12b (that is, an example having eight circuits).

  As shown in the drawing, each lead-in wire 17 is drawn into the house 18. As described above, in each house 18, the lead-in wire 17 is connected to the home wiring, and if a personal computer is connected to the child PLC device (not shown in FIG. 5) arranged in the house 18, it is connected to the optical fiber cable 13. As a result, it is possible to connect to the Internet via the optical fiber cable 13.

  In the example shown in the figure, a high-frequency cut filter 57 is disposed in each lead-in wire 17, and the high-frequency component is cut by the high-frequency cut filter 57 before the PLC contract is concluded. That is, since the high frequency signal superimposed on the commercial frequency (50 Hz or 60 Hz) is cut, the Internet connection or the like cannot be performed.

  On the other hand, in the house 18 with which the PLC contract is concluded, the high frequency cut filter 57 of the corresponding service line 17 is removed, and the high frequency signal superimposed on the commercial frequency is transmitted to the house 18 without being cut. .

  When a plurality of houses 18 have concluded a PLC contract, information (data) to be transmitted may be leaked. Therefore, it is desirable to transmit information that is not secret, but information leakage is not caused in each house. Therefore, security may be secured using a tag.

  7A is a front view of the on-road low-pressure branch box 12, FIG. 7B is a side view thereof, and FIG. 7C is a top view thereof.

  As shown in FIGS. 7A and 7C, the on-road low-pressure branch box 12 is fixed on the ground surface by a foundation bolt (not shown) or the like. The road low-pressure branch box 12 has a lead-in cabinet 61, and a pair of double doors 62 and 63 are attached to the front thereof. In the illustrated example, the door 62 is provided with two locks 64 to 66. ing. Further, below the doors 62 and 63, a plurality of vent holes 68 are formed in the base 67 of the pull-in board housing 61. In addition, as shown in FIG. 7B, a pair of ventilation ports 69 and 70 are formed on the side surface of the lead-in panel housing 61.

  If there is room in the lead-in cabinet 61, a plurality of PLC converters 16 may be arranged in the road low-pressure branch box 12, or the PLC converters 16 may be associated with each house. Good. The reason why the PLC conversion device 16 (parent) is arranged in the road low-pressure branch box 12 instead of the road transformer is because the transmission speed is related to the cable length and the number of branches. For example, the relationship between the cable length and the number of branches of the power line system and the transmission speed is known to be able to ensure a transmission speed of about 10 Mbps with a number of branches of about 3 to 4 in a power line system of 40 to 50 m. From the relationship between the cable length and the number of branches, it is desirable to arrange the PLC conversion device 16 in the low-pressure branch box 12 on the road where the cable length and the number of branches can be reduced. In addition, from the relationship between the PLC conversion device (parent) and the home PLC device (child), even if a plurality of PLC devices (child) are arranged in one house, there is no security problem, but a plurality of PLC devices ( It is practically difficult to separate the child) from the PLC conversion device (parent) in terms of security. If the PLC conversion device (parent) is arranged for each PLC device (child), it is sufficient to take encryption measures. Considering this point, it is desirable to arrange the PLC converter (parent) in the low-pressure branch box 12 on the road.

  In the above-described embodiment, the PLC converter is disposed in the low-voltage branch box on the road using the embedded composite power cable having the optical fiber cable, and the PLC converter is connected to the embedded lead-in line (embedded power line). Therefore, even in a residential area where there is no power pole, the FTTH service can be provided without drawing an optical fiber cable into each house.

  That is, the FTTH service can be easily performed even in an area where the FTTH service can no longer be provided due to the non-electric pole. In addition to monitoring the state of the road transformer and the road low-pressure branch box using the optical fiber cable, it is possible to remotely control the switch and the like. Furthermore, if a wireless router is used as a router, a sensor for measuring the surrounding environment can be networked.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

11 Road Transformer 12 Road Low Voltage Branch Box (Road Low Voltage Branch Box)
13 Optical fiber core (optical fiber cable)
14, 15 Composite power cable 16 PLC converter 17 Service line (power line (buried power cable))
18 Housing 19 Child PLC device (PLC modem)

Claims (5)

A high-speed communication system for performing power line carrier communication (PLC) using a power cable for supplying power to a house,
Each of the houses is located in a non-electric poled area using a buried composite power cable and a buried service line as the power cable,
The power is supplied to each of the houses through a substation, a road transformer, and a low-voltage branch box on the road having a lead-in board ,
At least between the road transformer and the road low voltage branch box is connected by the embedded composite power cable, each of the houses is connected from the road low voltage branch box by the buried lead-in line,
The embedded composite power cable is provided with an optical fiber cable , and in the space adjacent to the draw-in cabinet in the low-voltage branch box on the road , there is at least a media converter that performs media conversion and a PLC modem that performs the power line carrier communication. The media converter is connected to the optical fiber cable, and the PLC modem is connected to a branch circuit of a power cable in the embedded composite power cable for communication .
A high-speed communication system, wherein the power line carrier communication is performed from the PLC conversion device via the embedded lead-in line. In the on-road low-pressure branch box , the branch circuit branches the power cable of the embedded composite power cable into a plurality of branch terminals , and each of the embedded lead-in wires is connected to the branch terminal,
The high-speed communication system according to claim 1 , wherein the PLC modem of the PLC converter is connected to the branch circuit via a communication cable. The high-speed communication system according to claim 2, wherein the PLC conversion device has a PLC router function .   The high-speed communication system according to claim 1, wherein the embedded lead-in wire is covered with a shield material.   Each of the buried service lines is provided with a high frequency cut filter for cutting a high frequency component, and the high frequency cut filter is removed from the buried service line for a house contracted to perform the power line carrier communication. The high-speed communication system according to any one of claims 1 to 4.

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