JP2008199291A - Communicating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To organize, by parallel establishment, a high-frequency and high-speed communication network with a frequency band being higher than the frequency of communication in the transmission lines of the communication through the use of the existing or newly-established transmission lines of a contact communication line for maintenance, etc., to be used for a purpose such as the introduction and routine inspection, etc., of a private telephone line, a private broadcast line, or private equipment. <P>SOLUTION: A communication system includes: a high-frequency communication master station 4 which is connected by high frequency to the main transmission line of the communication system, where one-to-one communication is performed with the transmission lines having the main transmission line 3M and the plurality of parallel branch transmission lines 3B, via an additionally-established main transmission line 3AM; and a plurality of high frequency communication slave stations 5 which are connected by high frequency to the respective branch transmission lines via additionally-established branch transmission lines AB. The high-frequency communication of M:N (M is a natural number not less than one, N is a natural number not less than 2) is performed between the high frequency communication master station and the respective high-frequency communication slave stations by defining the additionally-established main transmission line, the branch transmission lines, and the additionally-established branch transmission lines as transmission media. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  This invention can be applied to existing transmission lines such as on-site telephone lines, on-site broadcasting lines, or maintenance communication lines used for installation / periodic inspection of on-site equipment, etc. in electric premises, factory premises, buildings, etc. The present invention relates to a communication system that constructs a new high-speed communication network using a road.

  In a conventional local area communication system, there are a high-speed communication system using an optical fiber, a multi-channel communication system using a coaxial cable, and the like as a communication system for transmitting images and a large amount of information. In addition, as a method using a twisted pair communication line, a communication method using an ADSL (Asymmetric Digital Subscribe Line Access System) or VDSL (Very High Speed Digital Subscribe Line Access System) technique has been known. (For example, see Patent Document 1)

JP 2001-25000 A (6th page, FIGS. 10-16 etc.)

In conventional high-speed communication systems using optical fibers and multi-channel communication systems using coaxial cables, it is necessary to lay a new broadband transmission line such as optical fibers and coaxial cables. There was a problem.
In addition, the twisted-pair cable system is an application technology based on ADSL or VDSL technology, so even if it can be realized with a point-to-point (1: 1) transmission line, There is a problem in that it cannot be applied to a network that attempts to realize point-to-multipoint (1: N) or multipoint-to-multipoint (M: N) communication using a loop-shaped line. Therefore, branching occurs even if a new communication device using a high-frequency signal is additionally connected to an existing twisted pair wire that performs communication at a point-to-point (1: 1), and communication performance deteriorates without an additional filter circuit. There was a problem of inviting.

  The present invention has been made in view of the above circumstances, and existing or newly established transmission lines such as on-site telephone lines, on-site broadcasting lines, or maintenance communication lines used for introduction / periodic inspection of on-site equipment, etc. It is an object of the present invention to construct a high-frequency high-speed communication network in a frequency band higher than the frequency of the communication on the communication transmission line using the channel.

  According to the present invention, a high-frequency connection is made to the main transmission line of a communication system in which 1: 1 communication is performed by a transmission line having a main transmission line and a plurality of parallel branch transmission lines via an additional main transmission line. A high-frequency communication master station, and a plurality of high-frequency communication slave stations connected to each of the branch transmission lines via an additional branch transmission line, between the high-frequency communication master station and each high-frequency communication slave station A communication system that performs high frequency communication of M: N (where M is a natural number of 1 or more and N is a natural number of 2 or more) using the additional main transmission line, the branch transmission line, and the additional branch transmission line as a transmission medium. It is.

  The present invention provides a high-frequency circuit that is connected to the main transmission line of a communication system in which 1: 1 communication is performed by a transmission line having a main transmission line and a plurality of parallel branch transmission lines via an additional main transmission line. A communication master station, and a plurality of high-frequency communication slave stations that are connected to each branch transmission line via high-frequency connection via additional branch transmission lines, and the additional communication between the high-frequency communication master station and each high-frequency communication slave station. Since the main transmission line, the branch transmission line, and the additional branch transmission line are used as transmission media, the communication system performs high frequency communication of M: N (where M is a natural number of 1 or more and N is a natural number of 2 or more). In addition, there is an effect that high-frequency communication can be easily installed in a communication system of 1: 1 communication in terms of cost and construction period.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIG. 1 showing an example of a system configuration of a communication system.

  In FIG. 1, an existing voice band communication master station 1 is connected to a plurality of existing voice band communication slave stations 2 via a transmission path 3 using a multi-branch twisted pair line, and is connected to the voice band communication master station 1. Audio signals from the microphones 12 and the like of the broadcasting equipment 11 are sent to speaker equipment (amplifier 21, speakers 22, etc.) arranged in large numbers on the premises site via the voice band communication slave station 2.

  The voice band communication master station 1 and each voice band communication slave station 2 are point-to-point (1: 1) communication.

  The transmission path 3 is composed of a main transmission path 3M and a branch transmission path 3B with a branch point A as a boundary. Further, the connection relationship of the transmission lines 3 is that the main transmission line 3M and each branch transmission line 3B are connected in series, and each branch transmission line 3B is connected at the branch point A and has a parallel connection relation.

  The additional high frequency communication master station 4 for performing high frequency high speed communication on the transmission path 3 which is the first communication network of the existing voice communication system composed of the voice band communication master station 1 and the plurality of voice band communication slave stations 2 described above. And a plurality of additionally installed high-frequency communication slave stations 5 are connected by branching and extending a transmission path 3 of a multi-branch twisted pair line, and transmitting a video signal on site to a central monitoring facility. The configuration is a high-frequency high-speed communication system with multipoint (1: N) lines.

  The high-frequency communication master station 4 and the branch point A are connected by an additional main transmission path 3AM of a twisted pair wire (hereinafter referred to as “additional installation”), and each high-frequency communication slave station 5 and the branch point A are additionally connected. It is connected by the additional branch transmission line 3AB.

  Each high-frequency communication slave station 5 inputs a video signal of each on-site video imaged by the camera 51 via a CODEC (Compression / Decompression) 52, and adds the video signal of each on-site video image. Using the existing branch transmission line 3AB, the existing branch transmission line 3B, and the additional main transmission line 3AM as transmission media, transmission is performed to the high-frequency communication master station 4 by high-frequency communication. Are displayed on a monitor 42 via a CODEC (Compression / Decompression) 41.

  A transmission signal from the existing first communication network by the voice band communication master station 1 and the plurality of voice band communication slave stations 2 is transmitted as indicated by solid arrows, and the additional high frequency communication master station 4 and the plurality of additional installations are added. A transmission signal of high-frequency high-speed communication with the high-frequency communication slave station 5 is transmitted as indicated by a broken line arrow.

  Next, the operation will be described.

  In the existing broadcasting equipment, the voice band communication master station 1 uses the existing voice band communication slave station 2 and voice communication using a frequency band of 4 kHz or less via the multi-branch transmission path 3 (3M, 3B). It is carried out.

  In the additionally installed high-frequency high-speed communication system, the newly installed high-frequency communication master station 4 and the newly installed high-frequency communication slave station 5 have a bandwidth of, for example, 100 kHz to 30 MHz via the multi-branch transmission path 3 (3AM, 3B, 3AB). Image communication is performed using a high frequency band.

  The newly installed high frequency communication master station 4 and the newly installed high frequency communication slave station 55 are designed to have a sufficiently high impedance when viewed from the transmission line in a voice band of 4 kHz or less, and thus adversely affect the existing broadcasting line. Is not given. Reflected signals are generated at the branching and terminating portions of the transmission line. The newly installed high frequency communication master station 4 and the newly installed high frequency communication slave station 5 are means for minimizing the deterioration of communication characteristics due to the reflected signals inside. By providing this, it is possible to secure communication performance with no practical problems. Further, the above-described high-frequency high-speed communication system can be applied to the case where the above-described first communication network is newly established, and the same applies to Embodiments 2 to 5 described later.

  According to the system of the first embodiment, the existing communication system and the newly installed high-frequency communication system perform frequency division multiplex communication on the multi-branch transmission path 3, so that logically independent communication without interfering with each other. The system can be operated in parallel, and since the existing transmission line 3 is used, there is an advantage that the communication line construction cost can be reduced.

Embodiment 2. FIG.
A second embodiment of the present invention will be described below with reference to FIG. 2 showing an example of a system configuration of a communication system.

  In the above-described first embodiment, an example in which a high-frequency high-speed communication system including the high-frequency communication master station 4 and a plurality of high-frequency communication slave stations 5 is constructed on an existing local broadcasting line is shown. An example in which a high-frequency and high-speed communication system is constructed by using an available private telephone line as shown in FIG.

  In FIG. 2, the same reference numerals are given to the same or corresponding parts as in FIG. 1 described above, and the following description of the second embodiment will be made only on parts that are essentially different from those of the first embodiment. The description of the same or corresponding parts as those in the first embodiment will be omitted.

  In FIG. 2, the high-frequency communication master station 4 is connected to an empty line terminal of a central IDF 6 for a private telephone, and the empty line terminal NUT of the central IDF 6 is short-circuited by a jumper line 7 which is a connection line inside the central IDF. A star-shaped point-to-multipoint (1: N) line is configured. The existing local telephone line (transmission path) 3 is connected to the high-frequency communication slave station 5 via the terminal IDF 8. Reference numeral 9a denotes an existing private branch exchange, and 9b denotes telephones at various locations on the existing private branch.

  According to this method, as in Embodiment 1 described above, there is an advantage that a high-frequency high-speed communication local network that performs monitoring control of a plurality of slave stations with a single master station can be configured with simple construction at low cost. .

Embodiment 3 FIG.
The third embodiment of the present invention will be described below with reference to FIG. 3 showing an example of the system configuration of a communication system.

  In the first embodiment described above, an example is shown in which a high-frequency high-speed communication system including the high-frequency communication master station 4 and a plurality of high-frequency communication slave stations 5 is constructed on an existing local broadcasting line. As shown in Fig. 5, an embodiment applied to a loop-shaped transmission line constituted by using an existing twisted pair line or a new twisted pair line is shown.

  3, the same reference numerals are given to the same or corresponding parts as in FIG. 1 described above, and the following description of the third embodiment will be made only on the parts that are essentially different from those of the first embodiment. The description of the same or corresponding parts as those in the first embodiment will be omitted.

  In FIG. 3, the high-frequency communication master station 4 is accommodated and provided in the supervisory control master station 10, and the high-frequency communication slave station 5 is accommodated and provided in the monitored control station 11.

  The high-frequency communication master station 4 and the high-frequency communication slave station 5 are connected to a transmission line 3 of a looped twisted pair line via branch lines 3A and 3B.

  In such a network configuration, the high-frequency communication master station 4 and the high-frequency communication slave station 5 can perform multipoint-to-multipoint (M: N) communication without relay reproduction, so that the twisted pair wire 3 in a loop shape is assumed to be Communication can be continued even if one place is disconnected, and a highly reliable network can be configured at low cost.

Embodiment 4 FIG.
The fourth embodiment of the present invention will be described below with reference to FIG. 4 showing an example of the system configuration of a communication system.

  In FIG. 4, the same or corresponding parts as those in FIG. 4 described above are denoted by the same reference numerals, and the following description of the fourth embodiment will be made only on parts that are essentially different from those of the second embodiment. And description of the same or corresponding parts as those of the second embodiment is omitted.

  In the second embodiment, the example in which the high-frequency communication master station 4 and the high-frequency communication slave station 5 are applied to the vacant lines of the existing local telephone line has been shown. However, in the fourth embodiment, as illustrated in FIG. By pulling out the additional branch line 3AMB from the central IDF 6 and installing the high-frequency communication master station 4 in parallel, the equipment (4, 41, 42) on the high-frequency communication master station 4 side can be easily duplicated, inexpensively and complicatedly. A highly reliable redundant equipment configuration can be realized without a simple switching mechanism. This redundant equipment configuration can be realized on the slave station side in the same manner.

Embodiment 5. FIG.
Embodiment 5 of the present invention will be described below with reference to FIG. 5 showing an example of the system configuration of a communication system.

  In FIG. 5, the same or corresponding parts as those in FIG. 3 described above are denoted by the same reference numerals, and the following description of the fifth embodiment will be made only on parts that are essentially different from those of the third embodiment. And description of the same or corresponding parts as those in the third embodiment is omitted.

  In the above-described third embodiment, the high-frequency communication master station 4 and the high-frequency communication slave station 5 are applied to a loop-shaped transmission line 3 configured by using an existing twisted pair transmission line or a new twisted pair transmission line. However, in the fifth embodiment, as shown in FIG. 5, the additional branch line 3AM is drawn from the connection point of the high-frequency communication master station 4 with the transmission line 3 of the loop twisted pair line, and the high-frequency communication master station 4 By connecting the monitoring control master station 10 in parallel via the network, the master station equipment can be easily duplicated, and a highly reliable redundant equipment configuration can be realized at low cost without a complicated switching mechanism. This redundant equipment configuration can be realized on the monitored control station side in the same manner.

Embodiment 6 FIG.
A sixth embodiment of the present invention will be described below with reference to FIG. 6 showing an example of a system configuration of a communication system.

    Fig. 6 shows the use of the existing maintenance telephone line laid for communication with the coordinator when installing and adjusting the control panel equipment in the power station, such as a power plant or substation. This is an example of constructing a new high-speed and large-capacity network for transmitting images and data.

  In FIG. 6, the same or corresponding parts as those in FIGS. 1 to 5 described above are denoted by the same reference numerals, and the following description of the seventh embodiment is essentially the same as in the first to fifth embodiments. Only the different parts will be described, and the description of the same or corresponding parts as in the first to fifth embodiments will be omitted.

  The existing on-site equipment maintenance telephone line based on 1: 1 connection is used, but high-frequency communication relay is performed via high-frequency signal couplers 14 provided on both sides of the line selection switch 13 in the central operation monitoring panel 12. The machine 15 relays the transmission line 3 on both sides of the line selection switch 13 at a high frequency, thereby bypassing the line selection switch 13 at a high frequency, and adopts a 1: N transmission line configuration, thereby providing an existing maintenance telephone function. A high-speed and large-capacity network can be constructed without influencing and without new transmission path laying costs.

  Note that an existing telephone 9b for on-site equipment maintenance is connected to an existing control panel 16 at various locations in an electric station such as a power plant or a substation via an existing call jack 17.

Embodiment 7 FIG.
The third embodiment of the present invention will be described below with reference to FIG. 7 showing an example of the system configuration of a communication system.

  FIG. 7 shows a power station using a transmission line 3 which is an existing broadcasting line laid as a paging line (also known as simultaneous broadcasting / call broadcasting equipment) in an electric station such as a power station or a substation. This is an example in which a new high-speed and large-capacity network is constructed by high-frequency and high-speed communication for transmitting images and data in an electric station such as a substation.

  In FIG. 7, the same or corresponding parts as those in FIGS. 1 to 6 are given the same reference numerals, and the following description of the seventh embodiment is essentially the same as in the first to sixth embodiments. Only the different parts will be described, and the description of the same or corresponding parts as in the first to sixth embodiments will be omitted.

  The paging line originally has a multi-branch 1: N transmission path configuration connected by an existing branch box 18, and the high-frequency communication repeater 15 is installed near the branch box, thereby branching by the branch box 18. Signal strength attenuation can be compensated, and a stable high-speed and large-capacity network can be constructed without affecting the paging function and without a new transmission line laying cost.

  Reference numeral 19 denotes an existing main apparatus for paging, and 20 denotes an existing handset station for paging.

  The high-speed communication systems of the above-described first to seventh embodiments include means for injecting and extracting a high-frequency signal such as an OFDM (orthogonal frequency division multiplexing) carrier by frequency multiplexing into a transmission line used by the existing communication system, and this OFDM. It is also equipped with means for transmitting high-speed and wide-band signals using high-frequency signals such as carriers, and means for minimizing deterioration of communication characteristics due to reflected signals generated at the branch part of the communication line. For example, a modem used in a high-speed communication system equipped with a power line carrier modem technology using a carrier signal of 10 kHz to 450 kHz approved for use in the Radio Law, or a high-speed power line carrier modem using a carrier signal of 2 MHz to 30 MHz. This can be realized by diverting this technology.

  Further, the transmission medium that is the transmission path of the above-described first to seventh embodiments may be a twisted pair line, a coaxial line, an optical fiber, a control line, or a power line.

  According to the above-described first to seventh embodiments, as described above, not only point-to-point (1: 1) but also point-to-multipoint (1: N) or multipoint-to-multipoint (M : N) It is possible to use a star shape, a dendritic shape, or a loop shape capable of communication, making it easy to apply to existing communication lines in terms of cost and construction time, and improving communication performance compared to conventional methods. Therefore, even when a new communication line is used, it is possible to realize the cost merit by reducing the communication line and the communication terminal station and the improvement of the reliability by making the communication line and the communication terminal station redundant.

  In the above-described first to seventh embodiments, means for injecting and extracting a high-frequency signal such as an OFDM (orthogonal frequency division multiplexing) carrier into a transmission line used by an existing communication system, an OFDM carrier, etc. It is equipped with means for transmitting high-speed, wide-band signals using high-frequency signals and means for minimizing deterioration of communication characteristics due to reflected signals generated at the branch part of the communication line. The modem used in the high-speed communication system is, for example, a power line carrier modem technology using a carrier signal of 10 kHz to 450 kHz, which is approved for use in the Radio Law, or a high speed power line carrier modem technology using a carrier signal of 2 MHz to 30 MHz. This can be realized by diverting.

  As described above, the above-described embodiment has the following technical singularities as compared with the conventional communication system.

  Singularity 1: High frequency connected to the main transmission line of a communication system in which 1: 1 communication is performed by a transmission line having a main transmission line and a plurality of parallel branch transmission lines via an additional main transmission line A communication master station, and a plurality of high-frequency communication slave stations that are connected to each branch transmission line via high-frequency connection via additional branch transmission lines, and the additional communication between the high-frequency communication master station and each high-frequency communication slave station. A communication system that performs M: N (where M is a natural number of 1 or more and N is a natural number of 2 or more) high-frequency communication using the main transmission line, the branch transmission line, and the additional branch transmission line as transmission media.

  Singularity 2: In the communication system of singularity 1, the communication system in which the 1: 1 communication is performed is an existing communication system, the main transmission path is an existing main transmission path, and each branch transmission path is A communication system characterized by being an existing branch transmission line.

  Singularity 3: In the communication system of singularity 1, the communication system in which the 1: 1 communication is performed is a new communication system, the main transmission path is a new main transmission path, and each branch transmission path is A communication system characterized by being a new branch transmission line.

  Singularity 4: The communication system according to any one of the singularities 1 to 3, wherein the 1: 1 communication is communication by private broadcasting.

  Singularity 5: The communication system according to any one of the singularities 1 to 3, wherein the 1: 1 communication is a private telephone communication.

  Singularity 6: The communication system according to any one of the singularities 1 to 3, wherein the main transmission path and each branch transmission path are connected by a loop transmission path.

  Singularity 7: The communication system according to any one of the singularities 1 to 3, wherein the high-frequency communication master station is additionally provided via an additional main transmission line.

  Singularity 8: The communication system according to any one of singularities 1 to 3, wherein the 1: 1 communication is communication by a telephone for equipment maintenance.

  Singularity 9: The communication system according to any one of singularities 1 to 3, wherein the main transmission path and each branch transmission path are paging lines.

  Singularity 10: A communication line whose main purpose is to transmit voice, such as a telephone line, a broadcast line, and a maintenance communication line, and a signal superimposed on a higher frequency band than the existing voice transmission band by frequency multiplexing. In a communication system including a communication modem for performing broadband communication and a transmission apparatus for transmitting and receiving video signals and large-capacity data through the communication modem, the transmission path form is not limited to point-to-point (1: 1) but the transmission path itself. A communication system characterized by branching or coupling to point-to-multipoint (1: N) or multipoint-to-multipoint (M: N) (where communication is mainly intended to transmit audio) The line may be a working line, an idle standby line, or a newly established line, and may extend not only to the premises such as factories and electric stations, but also to the outside of the premises. It will remain to operate the existing system, and when adding a new RF communication systems, the functionality of the existing system a new RF communication system is conceivable when implementing encompasses).

  Singularity 11: In the communication system of singularity 10, communication lines in the form of transmission path of point-to-point (1: 1) are connected to each other by IDF or the like, and point-to-multipoint (1: N) or multipoint-to-multi By adopting a point (M: N) transmission path configuration, one master station modem can communicate with many slave station modems, and broadcast communication and communication between slave stations can be easily realized. A communication system.

  Singularity 12: In the communication system of singularity 10, the point-to-multipoint (1: N) or multipoint-to-multipoint (M: N) communication is realized by configuring the transmission line form in a loop. A featured communication system.

  Singularity 12: A communication system characterized in that a redundant configuration such as duplication of a communication terminal station is realized by adding a branch of a transmission path in the communication system of any of the singularity 10 and the singularity 11 (note that In a loop transmission path, a redundant configuration may be realized by providing a new branch in the loop).

It is a figure which shows Embodiment 1 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 2 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 3 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 4 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 5 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 6 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system. It is a figure which shows Embodiment 7 of this invention, and is a figure which shows the example of the system configuration | structure of a communication system.

Explanation of symbols

1 Existing voice band communication master station,
2 Existing voice band communication slave stations,
3 Transmission line,
3M main transmission line,
3AM additional main transmission line,
3AMB,
3B branch transmission line,
3AB additional branch transmission line,
4 High frequency communication master station,
5 High-frequency communication slave stations,
6 Central IDF,
7 Jumper line 7 (connection line),
8 Terminal IDF,
9a Existing private branch exchange,
9b telephones at various locations on the existing premises,
10 Monitoring control master station,
11 Monitored control station,
12 Central operation monitoring panel,
13 Line selection switch,
14 high frequency signal coupler,
15 High frequency communication repeater,
16 Existing control panel,
17 Jack for existing calls,
18 branch box,
19 Existing main unit,
20 handset stations,
21 amplifier,
22 speakers,
41 CODEC,
42 monitor,
51 cameras,
52 CODEC,
A Branch point.

Claims (9)

  A high-frequency communication master station that is high-frequency connected to the main transmission line of the communication system in which 1: 1 communication is performed by a transmission line having a main transmission line and a plurality of parallel branch transmission lines via an additional main transmission line; And a plurality of high-frequency communication slave stations connected to each of the branch transmission lines via high-frequency branch transmission lines, and the additional main transmission line between the high-frequency communication master station and each of the high-frequency communication slave stations And M: N (where M is a natural number of 1 or more and N is a natural number of 2 or more) using the branch transmission path and the additional branch transmission path as a transmission medium.   The communication system according to claim 1, wherein the communication system in which the 1: 1 communication is performed is an existing communication system, the main transmission line is an existing main transmission line, and each branch transmission line is an existing communication line. A communication system characterized by being a branch transmission line.   2. The communication system according to claim 1, wherein the communication system in which the 1: 1 communication is performed is a new communication system, the main transmission line is a new main transmission line, and each branch transmission line is newly installed. A communication system characterized by being a branch transmission line.   The communication system according to any one of claims 1 to 3, wherein the 1: 1 communication is communication by local broadcasting.   The communication system according to any one of claims 1 to 3, wherein the 1: 1 communication is a private telephone communication.   The communication system according to any one of claims 1 to 3, wherein the main transmission line and each branch transmission line are connected by a loop transmission line.   The communication system according to any one of claims 1 to 3, wherein the high-frequency communication master station is additionally provided via an additional main transmission line.   4. The communication system according to claim 1, wherein the 1: 1 communication is communication by a telephone for equipment maintenance. 5.   4. The communication system according to claim 1, wherein the main transmission line and each branch transmission line are paging lines. 5.

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