JPH067697B2 - CATV device terminal test method - Google Patents
CATV device terminal test methodInfo
- Publication number
- JPH067697B2 JPH067697B2 JP61077667A JP7766786A JPH067697B2 JP H067697 B2 JPH067697 B2 JP H067697B2 JP 61077667 A JP61077667 A JP 61077667A JP 7766786 A JP7766786 A JP 7766786A JP H067697 B2 JPH067697 B2 JP H067697B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- test
- terminal device
- subscriber terminal
- central
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は有線テレビジョン装置（以下「ＣＡＴＶ装置」
という）に利用する。特に、中央装置と加入者端末装置
との対向試験に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cable television device (hereinafter referred to as "CATV device").
Called). In particular, it relates to a face-to-face test between the central device and the subscriber terminal device.
本発明は、中央装置と加入者端末装置との間でポーリン
グにより双方向通信を行うＣＡＴＶ装置において、 通信に用いる周波数と異なる搬送波周波数で送受信を行
う試験装置を伝送路に接続し、被試験端末装置に周波数
変換装置を接続して試験を行うことにより、 中央装置の処理効率および伝送路の使用効率を低下させ
ることなしに端末装置の試験を行うものである。The present invention relates to a CATV device that performs bidirectional communication by polling between a central device and a subscriber terminal device, by connecting a test device that transmits and receives at a carrier frequency different from the frequency used for communication to a transmission line, By connecting a frequency converter to the equipment and conducting a test, the terminal equipment is tested without reducing the processing efficiency of the central equipment and the use efficiency of the transmission line.
第２図は双方向ＣＡＴＶ装置のブロック構成図であり、
従来例ＣＡＴＶ装置の端末装置試験方法を示す。中央装
置１には、伝送路３を介して複数の加入者端末装置５が
接続される。FIG. 2 is a block diagram of the interactive CATV device.
A terminal device testing method for a conventional CATV device will be described. A plurality of subscriber terminal devices 5 are connected to the central device 1 via a transmission line 3.
双方向ＣＡＴＶ装置では、中央装置１からの指令により
個々の加入者端末装置５を選択するポーリング・セレク
ティング方式が用いられている。中央装置１は、第一の
周波数ｆ１の搬送波を用いて個々の加入者端末装置５に
指令を送出し、第二の周波数ｆ２の搬送波用いてその加
入者端末装置５からのデータを受信する。加入者端末装
置５は、受信した指令を復調部で復調し、データ受信部
で解析し、データ送信部で変調してデータを送出する。In the bidirectional CATV device, a polling / selecting method is used in which an individual subscriber terminal device 5 is selected by a command from the central device 1. The central unit 1 uses the carrier wave of the first frequency f 1 to send a command to each subscriber terminal device 5 and receives the data from the subscriber terminal device 5 using the carrier wave of the second frequency f 2. To do. The subscriber terminal device 5 demodulates the received command by the demodulation unit, analyzes it by the data reception unit, modulates it by the data transmission unit, and sends the data.
中央装置１は多数の加入者端末装置５を制御し、各種の
双方向サービスを行うとともに、各加入者端末装置５の
状態監視等のために、常時ポーリングを行っている。The central device 1 controls a large number of subscriber terminal devices 5 to perform various interactive services, and at the same time constantly polls for monitoring the status of each subscriber terminal device 5.
この双方向ＣＡＴＶ装置が稼働中に、加入者端末装置の
増設、移動または故障の診断を行う場合には、加入者宅
で試験を行う必要がある。従来の試験方法では、通常の
通信と同じ第一の周波数ｆ１および第二の周波数ｆ２を
用いて、中央装置１から加入者端末装置５に制御信号を
送信し、加入者端末装置５がこれに応答してデータを中
央装置１に送っていた。When this bidirectional CATV device is in operation, if a subscriber terminal device is to be added, moved, or diagnosed as a failure, it is necessary to conduct a test at the subscriber's house. In the conventional test method, a control signal is transmitted from the central device 1 to the subscriber terminal device 5 using the first frequency f 1 and the second frequency f 2 which are the same as those in normal communication, and the subscriber terminal device 5 In response to this, the data was sent to the central unit 1.
しかし、従来の試験方法では試験の制御に中央装置を用
いているので、中央装置の処理効率が低下し、双方向サ
ービスが低下する欠点があった。However, in the conventional test method, since the central device is used for controlling the test, there is a drawback that the processing efficiency of the central device is lowered and the interactive service is lowered.
本発明は、以上の問題点を解決し、ＣＡＴＶ装置におい
て中央装置の処理効率を低下させることなしに加入者端
末装置の試験を行う方法を提供するものである。The present invention solves the above problems and provides a method of testing a subscriber terminal device without reducing the processing efficiency of the central device in the CATV device.
本発明のＣＡＴＶ装置の端末装置試験方法は、中央装置
と端末装置との間でポーリングにより双方向通信を行う
ＣＡＴＶ装置の試験を行う方法において、中央装置側
で、通信に用いる周波数と異なる搬送波周波数で送受信
を行う試験装置を伝送路に接続し、被試験端末装置側の
伝送路に上記搬送波周波数を上記通信に用いる周波数に
変換する周波数変換装置を挿入接続して試験を行うこと
を特徴とする。A terminal device testing method for a CATV device according to the present invention is a method for testing a CATV device in which two-way communication is performed between a central device and a terminal device by polling, in which a carrier frequency different from a frequency used for communication on the central device side. A test device for transmitting and receiving is connected to a transmission line, and a frequency conversion device for converting the carrier frequency to a frequency used for the communication is inserted and connected to the transmission line of the terminal device under test to perform the test. .
本発明のＣＡＴＶ装置の端末装置試験方法は、通信に用
いる周波数と異なる搬送波周波数で送受信を行う試験装
置を伝送路に接続し、被試験端末装置に周波数変換装置
を接続して試験を行う。試験装置を接続することによ
り、中央装置の介在なしで端末装置の試験を行うことが
できる。また、中央装置と端末装置との通信に用いる周
波数とは異なる搬送波周波数で試験を行うので、中央装
置および他の端末装置の動作には影響を与えることがな
い。In the terminal device testing method for a CATV device of the present invention, a test device that performs transmission and reception at a carrier frequency different from the frequency used for communication is connected to the transmission path, and a frequency conversion device is connected to the terminal device under test to perform the test. By connecting the test equipment, the terminal equipment can be tested without intervention of the central equipment. Further, since the test is performed at a carrier frequency different from the frequency used for communication between the central device and the terminal device, the operations of the central device and other terminal devices are not affected.
第１図は本発明実施例ＣＡＴＶ装置の端末装置試験方法
を示すブロック構成図である。FIG. 1 is a block diagram showing a method for testing a terminal device of a CATV device according to an embodiment of the present invention.
中央装置１および試験装置２は伝送路３に接続される。
伝送路３には加入者端末装置５が接続される。被試験加
入者端末装置５′は周波数変換装置４を介して伝送路３
に接続される。The central unit 1 and the test unit 2 are connected to the transmission line 3.
A subscriber terminal device 5 is connected to the transmission line 3. The subscriber terminal device 5 ′ under test is connected to the transmission line 3 via the frequency conversion device 4.
Connected to.
周波数変換装置４は分波器41、44および周波数変換器4
2、43で構成される。分波器41は伝送路３に接続され、
分波器44は被試験加入者端末装置５′に接続される。分
波器41と分波器44とは周波数変換器42、43を介して接続
される。The frequency converter 4 includes the demultiplexers 41 and 44 and the frequency converter 4
It consists of 2, 43. The demultiplexer 41 is connected to the transmission line 3,
The duplexer 44 is connected to the subscriber terminal device 5'under test. The demultiplexer 41 and the demultiplexer 44 are connected via frequency converters 42 and 43.
中央装置１は、第一の周波数ｆ１の搬送波を用いて個々
の加入者端末装置５に指令を送出し、第二の周波数ｆ２
の搬送波を用いて個々の加入者端末装置５からのデータ
を受信する。加入者端末装置５は、受信した指令を復調
部で復調し、データ受信部で解析し、データ送信部で変
調してデータを送出する。The central unit 1 sends a command to each of the subscriber terminal units 5 using the carrier wave of the first frequency f 1 and the second frequency f 2
The data from each of the subscriber terminal devices 5 is received using the carrier wave. The subscriber terminal device 5 demodulates the received command by the demodulation unit, analyzes it by the data reception unit, modulates it by the data transmission unit, and sends the data.
試験装置２は、中央装置１の使用する第一および第二の
周波数ｆ１、ｆ２とは異なる第三の周波数ｆ３の搬送波
を用いて、被試験加入者端末装置５′に制御信号を送出
する。周波数変換装置４は、分波器41、周波数変換器42
および分波器44を経由して、上記制御信号の周波数をｆ
３からｆ１に変換し、これを被試験加入者端末装置５′
に供給する。The test apparatus 2 uses the carrier wave of the third frequency f 3 different from the first and second frequencies f 1 and f 2 used by the central apparatus 1 to send a control signal to the subscriber terminal device 5 ′ under test. Send out. The frequency conversion device 4 includes a demultiplexer 41 and a frequency converter 42.
And the frequency of the control signal via the demultiplexer 44 to f
3 to f 1 and converts this to the subscriber terminal device 5 ′ under test.
Supply to.
被試験加入者端末装置５′は制御信号に対する応答デー
タを周波数ｆ２の搬送波を用いて出力する。周波数変換
装置４は、分波器44、周波数変換器43および分波器41を
経由して、搬送波周波数を周波数をｆ２からｆ４に変換
し、これを伝送路３を介して試験装置２に送る。Tested subscriber terminal 5 'outputs using a carrier wave of frequency f 2 the response data to the control signal. The frequency conversion device 4 converts the carrier frequency from f 2 to f 4 via the demultiplexer 44, the frequency converter 43, and the demultiplexer 41, and this is converted into the test device 2 via the transmission line 3. Send to.
このように、被加入者端末装置５′では周波数ｆ１およ
びｆ２の搬送波を用いて通信を行うが、伝送路３上で
は、試験装置２と被試験加入者端末装置５′との間の通
信を周波数ｆ３およびｆ４の搬送波を用いて行ってい
る。伝送路３上の周波数が異なることから、中央装置１
および他の加入者端末装置３は、試験に関係なしに通常
の動作を実行できる。Thus, 'performs the communication using the carrier wave of the frequency f 1 and f 2, on the transmission path 3, and the test apparatus 2 to be tested subscriber terminal 5' the subscriber terminal 5 between the Communication is performed using carrier waves having frequencies f 3 and f 4 . Since the frequency on the transmission line 3 is different, the central unit 1
And the other subscriber terminals 3 can carry out normal operation regardless of the test.
以上説明したように、本発明のＣＡＴＶ装置の端末装置
試験方法は、中央装置の介在なしで個々の端末装置の試
験を行うことができる。また、試験用に通常の通信に用
いる周波数とは異なる周波数を用いるので、中央装置の
ポーリング動作と無関係に個々の加入者端末装置を試験
でき、しかも伝送路の使用効率を高めることができる。As described above, the CATV device terminal device testing method of the present invention can test individual terminal devices without the intervention of a central device. Further, since a frequency different from the frequency used for normal communication is used for the test, each subscriber terminal device can be tested regardless of the polling operation of the central device, and the use efficiency of the transmission line can be improved.
したがって本発明は、ＣＡＴＶ装置のメンテナンス、特
に加入者端末装置の増設、移動または故障の診断に効果
がある。Therefore, the present invention is effective for the maintenance of CATV devices, especially for the diagnosis of addition, movement or failure of subscriber terminal devices.
第１図は本発明実施例ＣＡＴＶ装置の端末装置試験方法
を示すブロック構成図。 第２図は従来例ＣＡＴＶ装置の端末装置試験方法を示す
ブロック構成図。 １…中央装置、２…試験装置、３…伝送路、４…周波数
変換装置、５…加入者端末装置、５′…被試験加入者端
末装置、41、44…分波器、42、43…周波数変換器。FIG. 1 is a block diagram showing a method for testing a terminal device of a CATV device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a method of testing a terminal device of a conventional CATV device. 1 ... Central apparatus, 2 ... Test apparatus, 3 ... Transmission line, 4 ... Frequency conversion apparatus, 5 ... Subscriber terminal apparatus, 5 '... Subscriber terminal apparatus under test, 41,44 ... Splitter, 42,43 ... Frequency converter.
Claims (1)
より双方向通信を行うＣＡＴＶ装置の試験を行う方法に
おいて、 中央装置側で、通信に用いる周波数と異なる搬送波周波
数で送受信を行う試験装置を伝送路に接続し、 被試験端末装置側の伝送路に上記搬送波周波数を上記通
信に用いる周波数に変換する周波数変換装置を挿入接続
して試験を行う ことを特徴とするＣＡＴＶ装置の端末装置試験方法。1. A method for testing a CATV device which performs bidirectional communication by polling between a central device and a terminal device, wherein a test device for transmitting and receiving at a carrier frequency different from a frequency used for communication is provided on the central device side. A terminal device test method for a CATV device, characterized in that the test is performed by connecting to a transmission line, and inserting and connecting a frequency conversion device for converting the carrier frequency into a frequency used for the communication in the transmission line on the side of the terminal device under test. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61077667A JPH067697B2 (en) | 1986-04-04 | 1986-04-04 | CATV device terminal test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61077667A JPH067697B2 (en) | 1986-04-04 | 1986-04-04 | CATV device terminal test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62234497A JPS62234497A (en) | 1987-10-14 |
| JPH067697B2 true JPH067697B2 (en) | 1994-01-26 |
Family
ID=13640230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61077667A Expired - Lifetime JPH067697B2 (en) | 1986-04-04 | 1986-04-04 | CATV device terminal test method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067697B2 (en) |
-
1986
- 1986-04-04 JP JP61077667A patent/JPH067697B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62234497A (en) | 1987-10-14 |
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