JP2001094483A - Power line communication network system and communication control device - Google Patents

Abstract

(57) [Problem] To provide a power line communication network system and a communication control device that do not require wiring of a dedicated line and that can easily change the network configuration. SOLUTION: An indoor power line network is constructed by connecting a communication terminal 5 to an indoor power line 1 via a power line modem 10 for transmitting and receiving a high frequency for information transmission, and the indoor power line 1 and the outdoor power line 2 are connected. A blocking circuit 4 for blocking a high frequency for information transmission is inserted into the unit, and the communication of the communication control device 3 for controlling the information transmission between networks via the power line modems 8 and 9 for the indoor power line 1 and the outdoor power line 2 respectively. By connecting to the ports 13, 13, communication from the communication terminal 5 on the indoor power line network to the outdoor power line network is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line communication network system using a power line as a transmission medium, and more particularly, to a power line communication network system and a communication control system which do not require a dedicated line and can easily change the network configuration. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, in order to construct a communication network system, a dedicated line is individually wired to each terminal device as a transmission medium (transmission path). Therefore, when newly introducing or moving a network device such as a terminal device or a relay device, it is necessary to newly perform wiring or change existing wiring.

[0003]

In the conventional communication network system, a large amount of labor is required for new wiring, addition, and movement of a dedicated line, and there is a large waste of unnecessary unnecessary lines after the change. .

An object of the present invention is to solve the above problems and to provide a power line communication network system and a communication control device which do not require wiring of a dedicated line and can easily change the network configuration.

[0005]

In order to achieve the above object, a communication network system using a power line according to the present invention comprises connecting a communication terminal to an indoor power line via a power line modem for transmitting / receiving a high frequency for information transmission. In addition to constructing the indoor power line network, a blocking circuit for blocking high-frequency information transmission is inserted at the connection between the indoor power line and the outdoor power line, and the indoor power line and the outdoor power line are connected to each other via the power line modem. By connecting to a communication port of a communication control device that controls information transmission, communication from a communication terminal on the indoor power line network to an outdoor power line network is enabled.

A communication port of the communication control device may be connected to the Internet via a telephone line, and the communication control device may have a server function for using the Internet from a communication terminal of the indoor power line network.

The communication port of the communication control device may be connected to an external network having a transmission line different from a telephone line, and the communication control device may have a gateway function between the indoor power line network and the external network. .

[0008] A non-fuse breaker for cutting off the indoor power line from the outdoor power line may be accommodated in the communication control device.

Further, the communication control device of the present invention has a plurality of communication ports, and connects the two communication ports to an indoor power line and an outdoor power line via a power line modem for transmitting and receiving a high frequency for information transmission. A non-fuse breaker for interrupting power is installed outside the power line modem connected to the outdoor power line by inserting a blocking circuit that blocks high frequency for information transmission at a connection between the indoor power line and the outdoor power line. .

[0010]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a communication network system using a power line according to the present invention includes an indoor power line network using an indoor power line 1 as a transmission line and an outdoor power line network using an outdoor power line 2 as a transmission line (both external power line networks). The communication control device 3 having a gateway function and the indoor power line network and the outdoor power line network are separated at a high frequency, that is, the communication signal is separated. A blocking circuit 4 for the purpose of separation, a personal computer 6 which is a communication terminal 5 connected as one node of the indoor power line network, an electronic device 7 such as a digital home appliance, a communication control device 3 and the communication terminal 5 2, power line modems 8, 9,
10 and a general telephone line modem or ISDN terminal adapter 1 for connecting the communication control device 3 to a network such as the Internet via a telephone line (not shown).
1 and a conversion adapter 12 for connecting the communication control device 3 to a network having a transmission path (not shown) different from a telephone line. Although not shown, a large number of outdoor power lines 2 are connected to the outdoor power line 2,
An indoor power line network can be constructed for each outdoor power line 2.

The communication control device 3 has a gateway function as described above. The gateway relays in all the seven layers of the OSI basic reference model among the devices connecting the LANs, and can be used for the connection between the LANs of different protocols. In addition, the communication control device 3
It has a server function and functions as one node in the outdoor power line network with respect to the power line network, and also functions as a server in the indoor power line network. The server provides and manages shared resources, and provides and manages communication such as e-mail to clients in the network.

The communication control device 3 has a plurality of communication ports 13 for connection to various networks, and has a processing unit 14 for processing communication between these communication ports 13.

The communication control device 3 is located near a distribution board (not shown) so as to be a base point for indoor communication and to be a division point with other networks in order to use an existing indoor power line as a transmission line. is set up.

The blocking circuit (also referred to as a block device) 4 functions to prevent the passage of high frequencies between the indoor power line 1 and the outdoor power line 2 in order to secure secrecy in the power line network. In power line communication, a signal is transmitted using a frequency higher than the commercial frequency of 50 Hz or 60 Hz, for example, a frequency included in a frequency band of 10 kHz to 450 kHz. For this reason, the blocking circuit 4 uses an inductance or the like having a characteristic of having a small impedance with respect to a commercial frequency, and having a high impedance at a high frequency. Since the impedance is high at a high frequency, the transmission signal does not pass through, and an independent network can be formed between indoor and outdoor. The blocking circuit 4 is installed closer to the room than the non-fuse breaker 15 in the house. Here, the power line on the indoor side of the blocking circuit 4 is referred to as an indoor power line 1, and the power line on the outdoor side of the blocking circuit 4 is referred to as an outdoor power line 2.

The power line modem 8 is connected to the indoor power line 1 on the indoor side from the blocking circuit 4 and can transmit and receive signals to and from the indoor power line 1. The power line modem 9 is connected to the outdoor power line 2 outside the blocking circuit 4 and can transmit and receive signals to and from the outdoor power line 2. Since one communication port 13 of the communication control device 3 is connected to the power line modem 8 and another communication port 13 is connected to the power line modem 9,
Communication can be performed between the indoor power line network and the outdoor power line network.

The communication terminal 5 including the personal computer 6 and the electronic device 7 is a client in the indoor power line network. These communication terminals 5 are connected to the indoor power line 1 via a power line modem 10. Thereby, the communication terminals 5 can communicate with each other via the communication control device 3 and each communication terminal 5 can communicate with another network via the communication control device 3. The connection between the communication terminal 5 and the power line modem 10 uses the RS232C Internet or the like.

Connection to another network via a telephone line is realized by connecting a modem for general telephone lines or a terminal adapter 11 for ISDN to the communication port 13 of the communication control device 3. Thus, the communication control device 3 and the communication terminal 5 can be connected to the Internet and can be remotely controlled from outside the home.

The connection with another network having a transmission line different from the telephone line, for example, a CATV, is realized by connecting the conversion adapter 12 to the communication port 13 of the communication control device 3. In this case, the communication control device 3 works as a gateway. As described above, the system can be expanded by connecting to a network other than the telephone line. This type of transmission path includes PHS,
There are general wireless communication, infrared communication, power line communication that is different from the method of the present invention, and connection is possible by using an appropriate conversion adapter 12.

[0020]

The present invention exhibits the following excellent effects.

(1) Since a network can be constructed using indoor power lines, wiring of a dedicated line is not required, and communication devices connected to the network can be easily moved.

(2) Since the high frequency is separated between the indoor power line and the outdoor power line, the same signal transmission method can be used for the indoor power line network and the outdoor power line network.

(3) A network other than the power line network (the Internet,
Since it is possible to communicate with a CATV or the like, it is possible to browse a homepage by connecting the personal computer 6 and the like to the Internet, and to monitor and control the state of the electronic device 7 and the like in the house from outside the house.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication network system using a power line according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor power line 2 Outdoor power line 3 Communication control device 4 Blocking circuit 5 Communication terminal 8, 9, 10 Power line modem 15 Non-fuse breaker

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichiro Soma 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Power Systems Research Laboratory, Hitachi Cable, Ltd. (72) Inventor Shogo Takayama 5-25 Asakusabashi, Taito-ku, Tokyo No. 7 F-term in Bizcon Corporation (reference) 5K046 PS24 PS41 5K048 AA01 BA12 BA13 BA36 CA08 DC06 DC07 EA11 FC01

Claims (5)

[Claims] An indoor power line network is constructed by connecting a communication terminal to an indoor power line via a power line modem for transmitting / receiving a high frequency for information transmission in a power line communication network system for transmitting information using a power line. At the same time, a blocking circuit for blocking a high frequency for information transmission is inserted in a connection portion between the indoor power line and the outdoor power line, and the indoor power line and the outdoor power line are respectively controlled for information transmission between networks via a power line modem. A communication network system using a power line, wherein communication from a communication terminal on the indoor power line network to an outdoor power line network is enabled by connecting to a communication port of a communication control device. 2. A communication port of the communication control device is connected to the Internet via a telephone line, and the communication control device has a server function for using the Internet from a communication terminal of the indoor power line network. The power line communication network system according to claim 1, wherein 3. A communication port of the communication control device is connected to an external network having a transmission line different from a telephone line,
3. The communication network system according to claim 1, wherein the communication control device has a gateway function between the indoor power line network and the external network. 4. The power line communication network system according to claim 1, wherein a non-fuse breaker for shutting off an indoor power line from an outdoor power line is housed inside the communication control device. 5. A communication control device used in a power line communication network system for transmitting information using a power line, the communication control device having a plurality of communication ports, and transmitting and receiving a high frequency for information transmission between the two communication ports. The power line modem is connected to the indoor power line and the outdoor power line via a power line modem, and a blocking circuit for blocking a high frequency for information transmission is inserted into a connection portion between the indoor power line and the outdoor power line. A communication control device comprising a non-fuse breaker for shutting off electric power on the outdoor side.