JPH03231595A - Test instrument for catv transmission line adjustment - Google Patents
Test instrument for catv transmission line adjustmentInfo
- Publication number
- JPH03231595A JPH03231595A JP2027579A JP2757990A JPH03231595A JP H03231595 A JPH03231595 A JP H03231595A JP 2027579 A JP2027579 A JP 2027579A JP 2757990 A JP2757990 A JP 2757990A JP H03231595 A JPH03231595 A JP H03231595A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- signal
- test
- center
- level
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 33
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Details Of Television Systems (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はＣＡＴＶ伝送路調整用試験器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a tester for adjusting CATV transmission lines.
従来のＣＡＴＶシステムの上り伝送路の調整法は、伝送
路の中継増幅器から試験信号を入力し、これをセンタに
て規定レベルで受信できるよう、中継増幅器側とセンタ
側とにそれぞれ人員を配置して１対１の対向にて試験を
行なう方法である。The conventional adjustment method for the upstream transmission line of a CATV system is to input a test signal from the relay amplifier on the transmission line, and to ensure that the test signal is received at the specified level at the center, personnel are assigned to each side of the relay amplifier and center. In this method, the test is conducted one-on-one face-to-face.
上述した従来のＣＡＴＶ伝送路調整法では、センタ側と
伝送路側とで２パ一テイ以上の調整員を必要とするので
、人件費が多大になり経済的でないという欠点がある。The above-mentioned conventional CATV transmission line adjustment method requires two or more coordinators on the center side and the transmission line side, which has the drawback of increasing personnel costs and being uneconomical.
本発明の試験器は、ＣＡＴＶシステムの伝送路に設置し
た中継増幅器に接続して試験用信号をセンタに向けて送
信するための試験信号発生部と、前記ＣＡＴＶシステム
のセンタに設置され前記試験用信号を受信して規定レベ
ルであれば応答用の制御信号を発生する試験信号受信部
と、該試験信号受信部からの制御信号を受けて前記伝送
路に返送するための試験応答信号を発生する試験応答信
号発生部とを備えている。The tester of the present invention includes a test signal generator for connecting to a relay amplifier installed in a transmission line of a CATV system and transmitting a test signal toward a center; a test signal receiving section that receives a signal and generates a response control signal if it is at a specified level; and a test signal receiving section that receives the control signal from the test signal receiving section and generates a test response signal for sending back to the transmission path. and a test response signal generator.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。本実施
例のＣＡＴＶシステムは、センタ４と、樹枝状に延びた
伝送路に設置した中継増幅器７〜１０とを具備して構成
される。伝送路調整時には、双方向伝送路及び片方向伝
送路にかかわらず、センタ４に近い位置より調整が行な
われる。FIG. 1 is a block diagram of one embodiment of the present invention. The CATV system of this embodiment includes a center 4 and repeater amplifiers 7 to 10 installed on a transmission line extending in a dendritic manner. When adjusting the transmission path, the adjustment is performed from a position close to the center 4, regardless of whether the transmission path is a bidirectional transmission path or a unidirectional transmission path.
下り方向伝送での調整時に、センタ４から規定の信号レ
ベルで送信される再送信、自主放送、パイサービス等が
各中継増幅器７〜１０において同じ出力レベルになる様
調整されるが、上り方向伝送の調整時には、各中継増幅
器７〜１０の出力レベルを、センタ４における入力レベ
ルが規定値となるよう調整しなければならず、従来は各
中継増幅器７〜１０側から試験信号を入力し、センタ４
にて規定入力レベルとなるように、１対１の対向にて調
整を行なっている。During adjustment in downstream transmission, retransmissions, independent broadcasts, PI services, etc. transmitted from the center 4 at a specified signal level are adjusted to have the same output level at each relay amplifier 7 to 10, but in upstream transmission When adjusting the output level of each relay amplifier 7 to 10, it is necessary to adjust the output level of each relay amplifier 7 to 10 so that the input level at the center 4 becomes the specified value. 4
Adjustments are made on a one-to-one basis so that the specified input level is reached.
本実施例では、例えば中継増幅器９の分岐端子或いはテ
スト用端子に試験信号発生部１から発生される試験信号
を入力する。この試験信号には、上り伝送帯域に（１０
〜１５ＭＨｚ＞の任意の周波数を使用する。この試験信
号は、センタ４に到達すると方向性１戸波器５により分
波されて試験信号受信部２に入力され、規定レベルでセ
ンタ４へ入力された場合にのみ、制御信号を発生させる
。In this embodiment, a test signal generated from the test signal generator 1 is inputted to a branch terminal or a test terminal of the relay amplifier 9, for example. This test signal includes (10
Use any frequency >~15MHz. When this test signal reaches the center 4, it is demultiplexed by the directional single-channel transducer 5 and input to the test signal receiving section 2, and only when it is input to the center 4 at a specified level, a control signal is generated.
中継増幅器９の出力レベルを調整していき、試験信号受
信部２からの制御信号に応じて下り伝送帯域の任意周波
数の試験応答を発生する試験応答信号発生部３と、下り
信号を結合させる混合器６とが接続し、試験応答信号が
方向性７戸波器５、中継増幅器７〜８を介し中継増幅器
９へ到達すれば、上り方向伝送の調整を完了する。A test response signal generator 3 adjusts the output level of the relay amplifier 9 and generates a test response at an arbitrary frequency in the downlink transmission band in response to a control signal from the test signal receiver 2, and a mixer combines the downlink signal. When the test response signal reaches the relay amplifier 9 via the directional transducer 5 and the relay amplifiers 7 to 8, the adjustment of uplink transmission is completed.
以状説明したように本発明は、伝送路の中継増幅器から
試験用信号をセンタに向けて送信し、センタにおいて試
験信号の受信レベルが規定値に達したら自動的に試験応
答信号を発生信号を発生して伝送路に返送することによ
り、伝送路側の１パーテイだけで伝送路調整を行なうこ
とが可能となり調整作業を経済的に行なえる効果がある
。As explained above, the present invention transmits a test signal from a relay amplifier on a transmission line toward a center, and automatically generates a test response signal when the reception level of the test signal reaches a specified value at the center. By generating the signal and sending it back to the transmission line, only one party on the transmission line side can adjust the transmission line, which has the effect of making the adjustment work economical.
第１図は本発明の実施例のブロック図である。
１・・・試験信号発生部、２・・・試験信号受信部、３
・・・試験応答信号発生部、４・・・センタ、５・・・
方向性ろ波器、６・・・混合器、７〜１０・・・中継増
幅器。FIG. 1 is a block diagram of an embodiment of the invention. 1... Test signal generation section, 2... Test signal reception section, 3
...Test response signal generation section, 4...Center, 5...
Directional filter, 6...mixer, 7-10...relay amplifier.
Claims (1)
して試験用信号をセンタに向けて送信するための試験信
号発生部と、前記ＣＡＴＶシステムのセンタに設置され
前記試験用信号を受信して規定レベルであれば応答用の
制御信号を発生する試験信号受信部と、該試験信号受信
部からの制御信号を受けて前記伝送路に返送するための
試験応答信号を発生する試験応答信号発生部とを備えて
いることを特徴とするＣＡＴＶ伝送路調整用試験器。A test signal generation unit is connected to a repeater amplifier installed in the transmission line of the CATV system and transmits the test signal toward the center; If so, a test signal receiving section that generates a response control signal, and a test response signal generating section that receives the control signal from the test signal receiving section and generates a test response signal to be sent back to the transmission path. A CATV transmission line adjustment tester characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2027579A JP3010668B2 (en) | 1990-02-06 | 1990-02-06 | CATV transmission line adjustment tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2027579A JP3010668B2 (en) | 1990-02-06 | 1990-02-06 | CATV transmission line adjustment tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03231595A true JPH03231595A (en) | 1991-10-15 |
| JP3010668B2 JP3010668B2 (en) | 2000-02-21 |
Family
ID=12224888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2027579A Expired - Lifetime JP3010668B2 (en) | 1990-02-06 | 1990-02-06 | CATV transmission line adjustment tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3010668B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100379456B1 (en) * | 1999-09-28 | 2003-04-10 | 엘지전자 주식회사 | A Failure Diagnostic Method of Digital TV Translator |
-
1990
- 1990-02-06 JP JP2027579A patent/JP3010668B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100379456B1 (en) * | 1999-09-28 | 2003-04-10 | 엘지전자 주식회사 | A Failure Diagnostic Method of Digital TV Translator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3010668B2 (en) | 2000-02-21 |
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