JP3694400B2 - Multi-channel signal distribution system - Google Patents

Multi-channel signal distribution system Download PDF

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Publication number
JP3694400B2
JP3694400B2 JP05197798A JP5197798A JP3694400B2 JP 3694400 B2 JP3694400 B2 JP 3694400B2 JP 05197798 A JP05197798 A JP 05197798A JP 5197798 A JP5197798 A JP 5197798A JP 3694400 B2 JP3694400 B2 JP 3694400B2
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Japan
Prior art keywords
channel signal
signal
channel
circuit
transmission
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Japanese (ja)
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JPH11251971A (en
Inventor
尚也 桜井
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Nippon Telegraph and Telephone Corp
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Nippon Telegraph and Telephone Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、多チャンネル信号を伝送する送受信装置を具える多チャンネル信号分配システムの信頼性を向上させるための冗長構成に関するものである。
【０００２】
【従来の技術】
図１に従来の多チャンネル信号分配システムの構成を示す。ＣＡＴＶに代表される多チャンネル分配システムにおいては、ヘッドエンドで多重された多チャンネル信号を分配網を利用して分配する。ケーブルモデム、ビデオオンデマンド等のようなサービスを提供する場合、多チャンネル信号は提供するサービスエリア毎に内容が異なるため、複数の送受信装置によりヘッドエンドから複数のサービスエリアに伝送される。このようなサービスでは、ヘッドエンドから各サービスエリアに伝送される信号が装置の故障により途絶えた場合は、そのサービスエリア全体にわたってサービスが停止される。
【０００３】
このため、伝送装置の信頼性を上げるため、装置を二重化する方法が考えられる。これは図２に示すように構成される。即ち、送信装置の送信回路及び受信装置の受信回路が二重化されている。このシステムでは、送信装置及び受信装置それぞれにおいて、入力信号を分岐して装置に入力し、装置の故障を検出して出力側の選択回路を制御し予備回路に切替えることにより、高い信頼性を得るものである。しかしながら、このようなシステムでは、全くの二重化を行うことから、経済的な観点における問題点が指摘されていた。
【０００４】
【発明が解決しようとする課題】
本発明の目的は、上述の問題点に鑑み、信頼性及び経済性が両立した冗長構成を具備する多チャンネル信号分配システムを提供することにある。
【０００５】
【課題を解決するための手段】
本発明の多チャンネル信号分配システムは、上記の目的を達成するため、複数のサービスエリアに対応し、複数の対向する多チャンネル信号送信装置及び多チャンネル信号受信装置により、全サービスエリア共通の多チャンネル信号と各エリア独立の多チャンネル信号とを多重して作成された多チャンネル信号の分配を行う多チャンネル信号分配システムにおいて、前記複数のサービスエリアに対応して複数の多チャンネル信号送信装置を並設し、各多チャンネル信号送信装置が信号分岐回路及び信号選択回路を具え、各信号分岐回路は自己の多チャンネル信号送信装置の送信信号を２分岐して出力し、この分岐した一方の信号は自装置の信号選択回路に供給され、分岐した他方の信号は当該自装置に並設された後段の多チャンネル信号送信装置における選択回路に供給され、各選択回路は自装置における分岐回路からの送信信号と、当該自装置の前段の多チャンネル信号送信装置における分岐回路からの送信信号とのいずれかを選択して出力するように、前記複数の多チャンネル信号送信装置を相互に信号接続した冗長構成を具備することを特徴とする。
【０００６】
また、他の本発明の多チャンネル信号分配システムは、複数のサービスエリアに対応し、複数の対向する多チャンネル信号送信装置及び多チャンネル信号受信装置により、全サービスエリア共通の多チャンネル信号と各エリア独立の多チャンネル信号とを多重して作成された多チャンネル信号の分配を行う多チャンネル信号分配システムにおいて、複数のサービスエリアに対応して複数の多チャンネル信号受信装置を並設し、各多チャンネル信号受信装置が信号分岐回路及び信号選択回路を具え、各信号分岐回路は自己の多チャンネル信号受信装置の受信信号を２分岐して出力し、この分岐した一方の信号は自装置の信号選択回路に供給され、分岐した他方の信号は当該自装置に並設された後段の多チャンネル信号受信装置における選択回路に供給され、各選択回路が自装置における分岐回路からの受信信号と、当該自装置の前段の多チャンネル信号受信装置における分岐回路からの受信信号とのいずれかを選択して出力するように、前記複数の多チャンネル信号受信装置を相互に信号接続した冗長構成を具備することを特徴とする。
【０００７】
【発明の実施の形態】
次に、図面を用いて本発明の実施例を説明する。図３にケーブルモデム、ビデオオンデマンド等のようなサービスを提供する場合における、各サービスエリアに伝送される信号のチャンネル配置例を示す。各サービスエリアの多チャンネル信号は、全サービスエリア共通の信号と各サービスエリア用の信号とを多重したものである。図３は両信号を周波数軸上でＦＤＭ多重した例を示すが、時間軸上のＴＤＭ多重であっても同様である。
【０００８】
図４は、本発明の多チャンネル信号分配システムにおける冗長構成を具えた多チャンネル信号送信装置の実施例のブロック図である。本発明の多チャンネル信号分配システムにおいては、必要な台数ｎ個の同様構成の多チャンネル信号送信装置11,12,...,1nを設置し、装置冗長を実現するため、第２番目の多チャンネル信号送信装置12には、第２番目のサービスエリアに分配する多チャンネル信号及び第１番目の装置11の分岐出力を入力し、以下同様にして第１番目の多チャンネル信号送信装置11には、第１番目のサービスエリアに分配する多チャンネル信号及び第ｎ番目の装置1nの分岐出力を入力し、全ての多チャンネル信号送信装置を相互接続する。
【０００９】
即ち、多チャンネル信号送信装置11,12,...,1nは、入力信号を送信信号の形式に変換する送信回路21,22,...,2n、送信信号を２分岐して出力する分岐回路31,32,...,3n、及び自装置11,12,...,1n内の分岐回路31,32,...,3nからの送信信号と他装置11,12,...,1nからの送信信号とのいずれかを選択する選択回路41,42,...,4nを具えている。部品点数の観点からは、送信回路21,22,...,2nの部品点数は多いが、分岐回路31,32,...,3n及び選択回路41,42,...,4nは部品点数の少ない高信頼性のブロックである。
【００１０】
多チャンネル信号送信装置は、構成部品点数の多い送信回路21,22,...,2nの故障に対して耐力を持たなければならない。通常、各選択回路41,42,...,4nは自装置内の分岐出力を選択して出力するが、例えば第２番目の多チャンネル信号送信装置12の送信回路22が故障したとすると、多チャンネル信号送信装置12内でこの故障を検出し、選択回路42を制御して第１番目の多チャンネル信号送信装置11からの分岐出力を選択し出力する。この場合、多チャンネル信号送信装置12には、全サービスエリア共通の信号及び第１番目のサービスエリア独立の信号が多重した信号を送信信号形式に変換された信号が伝送される。
【００１１】
このように、本発明の冗長構成を具える多チャンネル信号分配システムによれば、多チャンネル信号送信装置の送信回路21,22,...,2nの故障の場合、自己エリア独立の信号は出力できないが、全サービスエリア共通の信号は出力できる。映像分配の基本的サービスは全サービスエリア共通の信号で提供されることが一般的であることから、故障の場合にも基本的なサービスを維持することができることになる。
【００１２】
また、図５は、本発明の多チャンネル信号分配システムにおける冗長構成を具えた多チャンネル信号受信装置の実施例のブロック図である。本発明の多チャンネル信号分配システムにおいては、必要な台数ｎ個の同様構成の多チャンネル信号受信装置51,52,...,5nを設置し、装置冗長を実現するため、第２番目の多チャンネル信号受信装置52には、第２番目のサービスエリアに分配する多チャンネル信号及び第１番目の装置51の分岐出力を入力し、以下同様にして第１番目の多チャンネル信号受信装置51には、第１番目のサービスエリアに分配する多チャンネル信号及び第ｎ番目の装置5nの分岐出力を入力し、全ての多チャンネル信号受信装置を相互接続する。
【００１３】
即ち、多チャンネル信号受信装置51,52,...,5nは、入力信号を多チャンネル信号の形式に変換する受信回路61,62,...,6n、受信信号を２分岐して出力する分岐回路71,72,...,7n、及び自装置51,52,...,5n内の分岐回路71,72,...,7nからの受信信号と他装置51,52,...,5nからの受信信号とのいずれかを選択する選択回路81,82,...,8nを具えている。部品点数の観点からは、受信回路61,62,...,6nの部品点数は多いが、分岐回路71,72,...,7n及び選択回路81,82,...,8nは部品点数の少ない高信頼性のブロックである。
【００１４】
多チャンネル信号受信装置は、構成部品点数の多い受信回路61,62,...,6nの故障に対して耐力を持たなければならない。通常、各選択回路81,82,...,8nは自装置内の分岐出力を選択して出力するが、例えば第２番目の多チャンネル信号受信装置52の受信回路62が故障したとすると、多チャンネル信号受信装置52内でこの故障を検出し、選択回路82を制御して第１番目の多チャンネル信号受信装置51からの分岐出力を選択し出力する。この場合、第２番目のサービスエリアには、全サービスエリア共通の信号及び第１番目のサービスエリア独立の信号が多重した信号が分配される。
【００１５】
このように、本発明の冗長構成を具える多チャンネル信号分配システムによれば、多チャンネル信号受信装置の受信回路51,52,...,5nの故障の場合、自己エリア独立の信号は分配できないが、全サービスエリア共通の信号は分配できる。映像分配の基本的サービスは全サービスエリア共通の信号で提供されることが一般的であることから、故障の場合にも基本的なサービスを維持することができることになる。
【００１６】
【発明の効果】
以上説明したとおり、本発明の冗長構成を具える多チャンネル信号分配システムによれば、部品点数の多い送信回路及び受信回路を冗長に持つことなく、映像分配の基本的サービスを高い信頼性で提供することができるという、優れた効果を奏する。
【図面の簡単な説明】
【図１】従来の多チャンネル信号分配システムの構成を示す図である。
【図２】送信回路及び受信回路を二重化した従来の多チャンネル信号分配システムの構成を示す図である。
【図３】多チャンネル信号分配サービスを提供する場合における、各サービスエリアに伝送される信号のチャンネル配置例を示す図である。
【図４】本発明の冗長構成を具える多チャンネル信号送信装置の実施例のブロック図である。
【図５】本発明の冗長構成を具える多チャンネル信号受信装置の実施例のブロック図である。
【符号の説明】
11,12,...,1n 多チャンネル信号送信装置
21,22,...,2n 送信回路
31,32,...,3n 分岐回路
41,42,...,4n 選択回路
51,52,...,5n 多チャンネル信号受信装置
61,62,...,6n 受信回路
71,72,...,7n 分岐回路
81,82,...,8n 選択回路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a redundant configuration for improving the reliability of a multi-channel signal distribution system including a transmission / reception device for transmitting multi-channel signals.
[0002]
[Prior art]
FIG. 1 shows the configuration of a conventional multi-channel signal distribution system. In a multi-channel distribution system represented by CATV, a multi-channel signal multiplexed at the head end is distributed using a distribution network. When providing a service such as a cable modem or video on demand, the contents of the multi-channel signal are different for each service area to be provided, and are transmitted from the head end to a plurality of service areas by a plurality of transmission / reception devices. In such a service, when a signal transmitted from the head end to each service area is interrupted due to a device failure, the service is stopped over the entire service area.
[0003]
For this reason, in order to increase the reliability of the transmission apparatus, a method of duplicating the apparatus can be considered. This is configured as shown in FIG. That is, the transmission circuit of the transmission device and the reception circuit of the reception device are duplicated. In this system, high reliability is obtained by branching the input signal into each of the transmitting device and the receiving device, detecting the failure of the device, controlling the selection circuit on the output side, and switching to the standby circuit. Is. However, in such a system, since it is completely duplicated, problems from an economic viewpoint have been pointed out.
[0004]
[Problems to be solved by the invention]
In view of the above-described problems, an object of the present invention is to provide a multi-channel signal distribution system having a redundant configuration that achieves both reliability and economy.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a multi-channel signal distribution system according to the present invention corresponds to a plurality of service areas, and a multi-channel common to all service areas by a plurality of opposing multi-channel signal transmitters and multi-channel signal receivers. In a multi-channel signal distribution system that distributes multi-channel signals created by multiplexing signals and multi-channel signals independent of each area, a plurality of multi-channel signal transmitters are arranged in parallel corresponding to the plurality of service areas. Each multi-channel signal transmission device includes a signal branch circuit and a signal selection circuit. Each signal branch circuit bifurcates and outputs the transmission signal of its own multi-channel signal transmission device. The other split signal supplied to the signal selection circuit of the device is the multi-channel signal transmission of the subsequent stage that is arranged in parallel with the device itself Each selection circuit selects and outputs either the transmission signal from the branch circuit in its own device or the transmission signal from the branch circuit in the multi-channel signal transmission device in the previous stage of its own device. As described above, a redundant configuration in which the plurality of multi-channel signal transmission devices are connected to each other is provided.
[0006]
Another multi-channel signal distribution system of the present invention corresponds to a plurality of service areas, and a multi-channel signal common to all service areas and each area by a plurality of opposing multi-channel signal transmitters and multi-channel signal receivers. In a multi-channel signal distribution system that distributes multi-channel signals created by multiplexing independent multi-channel signals, a plurality of multi-channel signal receivers are arranged in parallel corresponding to a plurality of service areas. The signal receiving device includes a signal branch circuit and a signal selection circuit, and each signal branch circuit branches and outputs the reception signal of its own multi-channel signal reception device, and one of the branched signals is the signal selection circuit of its own device. The selection signal in the multi-channel signal receiving apparatus in the subsequent stage is arranged in parallel with the own apparatus. Each of the selection circuits is configured to select and output either a reception signal from the branch circuit in the own device and a reception signal from the branch circuit in the multi-channel signal reception device in the previous stage of the own device. A redundant configuration in which a plurality of multi-channel signal receiving devices are connected to each other in signal is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows an example of channel arrangement of signals transmitted to each service area when a service such as a cable modem or video on demand is provided. The multi-channel signal in each service area is obtained by multiplexing a signal common to all service areas and a signal for each service area. FIG. 3 shows an example in which both signals are FDM multiplexed on the frequency axis, but the same applies to TDM multiplexing on the time axis.
[0008]
FIG. 4 is a block diagram of an embodiment of a multi-channel signal transmission apparatus having a redundant configuration in the multi-channel signal distribution system of the present invention. In the multi-channel signal distribution system according to the present invention, the second multi-channel signal transmission apparatus 11, 12,... The channel signal transmitter 12 receives the multi-channel signal to be distributed to the second service area and the branch output of the first device 11, and the same goes to the first multi-channel signal transmitter 11. The multi-channel signal distributed to the first service area and the branch output of the n-th device 1n are input, and all the multi-channel signal transmission devices are interconnected.
[0009]
That is, the multi-channel signal transmission device 11, 12,..., 1n is a transmission circuit 21, 22,..., 2n that converts an input signal into a transmission signal format, and a branch that outputs the transmission signal in two branches. Circuits 31, 32, ..., 3n and the own devices 11, 12, ..., 1n, branch circuits 31, 32, ..., 3n, transmission signals and other devices 11, 12, ... , 4n are provided for selecting one of the transmission signals from 1n. From the viewpoint of the number of parts, the transmission circuits 21, 22, ..., 2n have many parts, but the branch circuits 31, 32, ..., 3n and the selection circuits 41, 42, ..., 4n are parts. It is a highly reliable block with a small number of points.
[0010]
The multi-channel signal transmission device must be resistant to the failure of the transmission circuits 21, 22,..., 2n having a large number of components. Normally, each selection circuit 41, 42,..., 4n selects and outputs a branch output in its own device. For example, if the transmission circuit 22 of the second multi-channel signal transmission device 12 fails, This failure is detected in the multi-channel signal transmitter 12, and the selection circuit 42 is controlled to select and output the branch output from the first multi-channel signal transmitter 11. In this case, the multi-channel signal transmitter 12 transmits a signal obtained by converting a signal obtained by multiplexing a signal common to all service areas and a first service area independent signal into a transmission signal format.
[0011]
Thus, according to the multi-channel signal distribution system having the redundant configuration of the present invention, in the case of a failure of the transmission circuits 21, 22,..., 2n of the multi-channel signal transmission device, the self-independent signal is output. It is not possible to output signals common to all service areas. Since the basic service of video distribution is generally provided by signals common to all service areas, the basic service can be maintained even in the event of a failure.
[0012]
FIG. 5 is a block diagram of an embodiment of a multi-channel signal receiving apparatus having a redundant configuration in the multi-channel signal distribution system of the present invention. In the multi-channel signal distribution system according to the present invention, the second multi-channel signal receiving apparatus 51, 52,... The channel signal receiving device 52 receives the multi-channel signal distributed to the second service area and the branch output of the first device 51, and the same applies to the first multi-channel signal receiving device 51. The multi-channel signal distributed to the first service area and the branch output of the n-th device 5n are input, and all the multi-channel signal receiving devices are interconnected.
[0013]
In other words, the multi-channel signal receivers 51, 52,..., 5n receive the receiving circuits 61, 62,. Branch circuit 71,72, ..., 7n and its own device 51,52, ..., 5n received signal from branch circuit 71,72, ..., 7n and other device 51,52, ... ., 8n are provided for selecting one of the received signals from 5n. From the viewpoint of the number of parts, the receiving circuits 61, 62, ..., 6n have many parts, but the branch circuits 71, 72, ..., 7n and the selection circuits 81, 82, ..., 8n are parts. It is a highly reliable block with a small number of points.
[0014]
The multi-channel signal receiving apparatus must be resistant to failure of the receiving circuits 61, 62,..., 6n having a large number of components. Normally, each selection circuit 81, 82,..., 8n selects and outputs a branch output in its own device. For example, if the reception circuit 62 of the second multi-channel signal reception device 52 fails, This failure is detected in the multi-channel signal receiving device 52, and the selection circuit 82 is controlled to select and output the branch output from the first multi-channel signal receiving device 51. In this case, a signal in which a signal common to all service areas and a signal independent of the first service area are multiplexed are distributed to the second service area.
[0015]
As described above, according to the multi-channel signal distribution system having the redundant configuration of the present invention, in the case of the failure of the receiving circuits 51, 52,. It is not possible to distribute signals common to all service areas. Since the basic video distribution service is generally provided by signals common to all service areas, the basic service can be maintained even in the event of a failure.
[0016]
【The invention's effect】
As described above, according to the multi-channel signal distribution system having the redundant configuration of the present invention, the basic service of video distribution is provided with high reliability without having redundant transmission circuits and reception circuits with a large number of parts. There is an excellent effect of being able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a conventional multi-channel signal distribution system.
FIG. 2 is a diagram showing a configuration of a conventional multi-channel signal distribution system in which a transmission circuit and a reception circuit are duplicated.
FIG. 3 is a diagram illustrating an example of channel arrangement of signals transmitted to each service area when a multi-channel signal distribution service is provided.
FIG. 4 is a block diagram of an embodiment of a multi-channel signal transmission apparatus having a redundant configuration according to the present invention.
FIG. 5 is a block diagram of an embodiment of a multi-channel signal receiving apparatus having a redundant configuration according to the present invention.
[Explanation of symbols]
11,12, ..., 1n Multi-channel signal transmitter
21,22, ..., 2n Transmitter circuit
31,32, ..., 3n branch circuit
41,42, ..., 4n selection circuit
51,52, ..., 5n Multi-channel signal receiver
61,62, ..., 6n Receiver circuit
71,72, ..., 7n branch circuit
81,82, ..., 8n selection circuit

Claims (2)

複数のサービスエリアに対応し、複数の対向する多チャンネル信号送信装置及び多チャンネル信号受信装置により、全サービスエリア共通の多チャンネル信号と各エリア独立の多チャンネル信号とを多重して作成された多チャンネル信号の分配を行う多チャンネル信号分配システムにおいて、前記複数のサービスエリアに対応して複数の多チャンネル信号送信装置を並設し、各多チャンネル信号送信装置が信号分岐回路及び信号選択回路を具え、各信号分岐回路は自己の多チャンネル信号送信装置の送信信号を２分岐して出力し、この分岐した一方の信号は自装置の信号選択回路に供給され、分岐した他方の信号は当該自装置に並設された後段の多チャンネル信号送信装置における選択回路に供給され、各選択回路は自装置における分岐回路からの送信信号と、当該自装置の前段の多チャンネル信号送信装置における分岐回路からの送信信号とのいずれかを選択して出力するように、前記複数の多チャンネル信号送信装置を相互に信号接続した冗長構成を具備することを特徴とする多チャンネル信号分配システム。  A multi-channel signal corresponding to a plurality of service areas and created by multiplexing a multi-channel signal common to all service areas and a multi-channel signal independent of each area by a plurality of opposing multi-channel signal transmitters and multi-channel signal receivers. In a multi-channel signal distribution system for distributing channel signals, a plurality of multi-channel signal transmitters are arranged in parallel corresponding to the plurality of service areas, and each multi-channel signal transmitter includes a signal branching circuit and a signal selection circuit. Each signal branch circuit bifurcates and outputs the transmission signal of its own multi-channel signal transmission device, one of the branched signals is supplied to the signal selection circuit of the own device, and the other branched signal is the own device. Are supplied to a selection circuit in a multi-channel signal transmission device in a subsequent stage, and each selection circuit is a branch circuit in its own device. The plurality of multi-channel signal transmitters are signal-connected to each other so as to select and output one of the transmission signal from the transmitter and the transmission signal from the branch circuit in the multi-channel signal transmitter in the previous stage of the device itself A multi-channel signal distribution system comprising a redundant configuration. 複数のサービスエリアに対応し、複数の対向する多チャンネル信号送信装置及び多チャンネル信号受信装置により、全サービスエリア共通の多チャンネル信号と各エリア独立の多チャンネル信号とを多重して作成された多チャンネル信号の分配を行う多チャンネル信号分配システムにおいて、複数のサービスエリアに対応して複数の多チャンネル信号受信装置を並設し、各多チャンネル信号受信装置が信号分岐回路及び信号選択回路を具え、各信号分岐回路は自己の多チャンネル信号受信装置の受信信号を２分岐して出力し、この分岐した一方の信号は自装置の信号選択回路に供給され、分岐した他方の信号は当該自装置に並設された後段の多チャンネル信号受信装置における選択回路に供給され、各選択回路が自装置における分岐回路からの受信信号と、当該自装置の前段の多チャンネル信号受信装置における分岐回路からの受信信号とのいずれかを選択して出力するように、前記複数の多チャンネル信号受信装置を相互に信号接続した冗長構成を具備することを特徴とする多チャンネル信号分配システム。  A multi-channel signal corresponding to a plurality of service areas and created by multiplexing a multi-channel signal common to all service areas and a multi-channel signal independent of each area by a plurality of opposing multi-channel signal transmitters and multi-channel signal receivers. In a multi-channel signal distribution system that distributes channel signals, a plurality of multi-channel signal receivers are arranged in parallel corresponding to a plurality of service areas, and each multi-channel signal receiver includes a signal branching circuit and a signal selection circuit. Each signal branch circuit bifurcates and outputs the received signal of its own multi-channel signal receiver. One of the branched signals is supplied to the signal selection circuit of the own device, and the other branched signal is supplied to the own device. Supplied to the selection circuit in the multi-channel signal receiving apparatus in the subsequent stage arranged in parallel, and each selection circuit from the branch circuit in its own apparatus A redundancy in which the plurality of multi-channel signal receiving devices are connected to each other so as to select and output either a received signal or a received signal from a branch circuit in the multi-channel signal receiving device in the preceding stage of the own device A multi-channel signal distribution system comprising a configuration.
JP05197798A 1998-03-04 1998-03-04 Multi-channel signal distribution system Expired - Lifetime JP3694400B2 (en)

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