JPH1056628A - Branching/distributing device for two-way catv - Google Patents
Branching/distributing device for two-way catvInfo
- Publication number
- JPH1056628A JPH1056628A JP8227483A JP22748396A JPH1056628A JP H1056628 A JPH1056628 A JP H1056628A JP 8227483 A JP8227483 A JP 8227483A JP 22748396 A JP22748396 A JP 22748396A JP H1056628 A JPH1056628 A JP H1056628A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- pass filter
- transmission line
- distributor
- output terminal
- 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
Landscapes
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、上り流合雑音を抑
制する双方向CATV用分岐/分配装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional CATV branch / distribution apparatus for suppressing upstream ingress noise.
【0002】[0002]
【従来の技術】CATVの需要家にて、下り信号のみを
利用する単方向サービス、例えばテレビを視聴すること
と、双方向サービス、例えばデータ通信を行うことの両
方を利用するとき、図4のように単方向サービス用と双
方向サービス用に2分配していた。ここで、ハイパスフ
ィルタ32は単方向サービス用端子から上り帯域の雑音
がセンタに上らないようにするために挿入している。2. Description of the Related Art When a CATV customer uses both a one-way service using only a downlink signal, for example, watching a television, and a two-way service, for example, performing data communication, FIG. As described above, two distributions are provided for one-way service and two-way service. Here, the high-pass filter 32 is inserted in order to prevent noise in the upstream band from reaching the center from the unidirectional service terminal.
【0003】しかし、図4の装置では上り帯域信号と下
り帯域信号が共に分配器を通ることになり両信号共に分
配器による分配損失の影響を受ける。そこで、上り帯域
信号の分配損失を補うために上り帯域信号を増幅する増
幅器を使用することが多くみられるが、増幅器は自ら雑
音を発生するので、多数の需要家にて増幅器を使用され
ると幹線に雑音が流合する結果、通信が妨害されてい
る。However, in the apparatus shown in FIG. 4, both the upstream band signal and the downstream band signal pass through the distributor, and both signals are affected by the distribution loss caused by the distributor. In order to compensate for the distribution loss of the upstream band signal, an amplifier that amplifies the upstream band signal is often used.However, since the amplifier itself generates noise, when an amplifier is used by many customers, Communication is obstructed as a result of noise flowing into the main line.
【0004】ところで、図5のような双方向分配器が知
られている(特開昭62−164322、特開平2−3
1507)。この双方向分配器の目的は、信号に重畳さ
れた電力を効率よく分配器の入力端子56から出力端子
581及び582に給電することであり(特開昭62−
164322)、多数の双方向分配器が接続されたとき
に伝送路の低周波インピーダンスの低下を防ぐことによ
り、低周波信号の高調波成分の電力損失の増加を防止す
ることで、波形歪の増大を抑制することである(特開平
2−31507)。Incidentally, a bidirectional distributor as shown in FIG. 5 is known (Japanese Patent Laid-Open No. Sho 62-164322, Japanese Patent Laid-Open No. Hei 2-3).
1507). The purpose of this bidirectional distributor is to efficiently supply the power superimposed on the signal from the input terminal 56 of the distributor to the output terminals 581 and 582.
164322) When a large number of bidirectional distributors are connected, lowering of the low-frequency impedance of the transmission line is prevented, thereby preventing an increase in power loss of harmonic components of the low-frequency signal, thereby increasing waveform distortion. (JP-A-2-31507).
【0005】さらに、図6のような双方向伝送路と単方
向伝送路を接続する装置が知られている(実公昭60−
12385)。この装置の目的は上り帯域のインピーダ
ンスの整合をとることにより、双方向伝送路にて上り帯
域信号の乱れと上り帯域妨害波の侵入を防ぐことであ
る。Further, a device for connecting a bidirectional transmission line and a unidirectional transmission line as shown in FIG. 6 is known.
12385). The purpose of this device is to prevent the disturbance of the upstream band signal and the intrusion of the upstream band interference wave in the bidirectional transmission line by matching the impedance of the upstream band.
【0006】[0006]
【発明が解決しようとする課題】上記のように、上り帯
域信号を分配器に通すと分配損失が発生するので増幅器
を用いる必要がある。しかし、増幅器は雑音を発生し、
その雑音が幹線に流合すると通信を妨害する。本発明の
目的は、双方向サービス端子からの上り帯域信号を分配
器に通さないことにより雑音発生源である上り帯域信号
の増幅器を不要にすることと単方向サービス端子からの
上り帯域の雑音を抑止することにより、上り帯域流合雑
音を減少させることである。As described above, when an upstream band signal is passed through a distributor, distribution loss occurs, so that an amplifier must be used. However, the amplifier generates noise,
If the noise flows into the main line, it interferes with communication. An object of the present invention is to eliminate the need for an amplifier for an upstream band signal which is a noise source by not passing an upstream band signal from a bidirectional service terminal to a distributor, and to reduce upstream band noise from a unidirectional service terminal. The suppression is to reduce the upstream band ingress noise.
【0007】[0007]
【課題を解決するための手段】請求項1の発明は図1に
示すように、センタと接続されている双方向伝送路に接
続される入力端子6に第1ハイパスフィルタ2の第1端
子2aと第1ローパスフィルタ4の第1端子4aが接続
されており、需要家端末に接続されている双方向伝送路
に接続される出力端子8に第2ハイパスフィルタ3の第
1端子3aと第1ローパスフィルタ4の第2端子4bが
接続されており、分配器1の入力端子1aには第1ハイ
パスフィルタ2の第2端子2bが接続されており、分配
器1の出力端子1bには単方向伝送路が接続される出力
端子7が接続されており、分配器1の出力端子1cには
第2ハイパスフィルタ3の第2端子3bが接続されてい
ることを特徴とする双方向分岐/分配装置である。According to the present invention, as shown in FIG. 1, a first terminal 2a of a first high-pass filter 2 is connected to an input terminal 6 connected to a bidirectional transmission line connected to a center. The first terminal 4a of the first low-pass filter 4 is connected to the first terminal 3a of the second high-pass filter 3 and the first terminal 3a of the second high-pass filter 3 to the output terminal 8 connected to the bidirectional transmission line connected to the customer terminal. The second terminal 4b of the low-pass filter 4 is connected, the input terminal 1a of the distributor 1 is connected to the second terminal 2b of the first high-pass filter 2, and the output terminal 1b of the distributor 1 is unidirectional. An output terminal 7 to which a transmission line is connected is connected, and an output terminal 1c of the distributor 1 is connected to a second terminal 3b of a second high-pass filter 3. It is.
【0008】請求項2の発明は図2に示すように、セン
タと接続されている双方向伝送路に接続される入力端子
26に第1ハイパスフィルタ22の第1端子22aと第
1ローパスフィルタ24の第1端子24aが接続されて
おり、需要家端末に接続されている双方向伝送路に接続
される出力端子28に第2ハイパスフィルタ23の第1
端子23aと第1ローパスフィルタ24の第2端子24
bが接続されており、分配器21の入力端子21aには
第1ハイパスフィルタ22の第2端子22bと第2ロー
パスフィルタ25の第1端子25aが接続されており、
分配器21の出力端子21bには単方向伝送路が接続さ
れる出力端子27が接続されており、分配器21の出力
端子21cには第2ハイパスフィルタ23の第2端子2
3bが接続されており、第2ローパスフィルタ25の第
2端子25bには終端抵抗29が接続されていることを
特徴とする双方向分岐/分配装置である。As shown in FIG. 2, the first terminal 22a of the first high-pass filter 22 and the first low-pass filter 24 are connected to an input terminal 26 connected to a bidirectional transmission line connected to the center. The first terminal 24a of the second high-pass filter 23 is connected to the output terminal 28 connected to the bidirectional transmission path connected to the customer terminal.
Terminal 23a and second terminal 24 of first low-pass filter 24
b is connected, the input terminal 21a of the distributor 21 is connected to the second terminal 22b of the first high-pass filter 22 and the first terminal 25a of the second low-pass filter 25,
The output terminal 21 b of the distributor 21 is connected to an output terminal 27 to which a unidirectional transmission line is connected, and the output terminal 21 c of the distributor 21 is connected to the second terminal 2 of the second high-pass filter 23.
3b, and a terminating resistor 29 is connected to the second terminal 25b of the second low-pass filter 25.
【0009】[0009]
【発明の実施の形態】以下、本発明を具体的な実施例に
基づいて説明する。図2は、本発明の構成を示したもの
である。双方向伝送路に接続される入力端子26には第
1ハイパスフィルタ22の第1端子22aと第1ローパ
スフィルタ24の第1端子24aが接続されている。信
号を分配する分配器21の入力端子21aには第1ハイ
パスフィルタ22の第2端子22bと第2ローパスフィ
ルタ25の第1端子25aが接続されており、第2ロー
パスフィルタ25の第2端子25bは終端抵抗29を介
して接地されている。また、分配器21の出力端子21
bにはTV受像機等の下り帯域信号のみを利用する装置
が接続される出力端子27が接続されている。そして、
分配器21の出力端子21cには第2ハイパスフィルタ
23の第2端子23bが接続されており、データ端末等
の双方向の信号を利用する装置が接続される出力端子2
8には第1ローパスフィルタ24の第2端子24bと第
2ハイパスフィルタ23の第1端子23aが接続されて
いる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments. FIG. 2 shows the configuration of the present invention. The first terminal 22a of the first high-pass filter 22 and the first terminal 24a of the first low-pass filter 24 are connected to the input terminal 26 connected to the bidirectional transmission path. A second terminal 22b of the first high-pass filter 22 and a first terminal 25a of the second low-pass filter 25 are connected to an input terminal 21a of the distributor 21 for distributing signals, and a second terminal 25b of the second low-pass filter 25 is connected. Are grounded via a terminating resistor 29. Also, the output terminal 21 of the distributor 21
An output terminal 27 to which a device such as a TV receiver that uses only the downstream band signal is connected is connected to b. And
The output terminal 21c of the distributor 21 is connected to the second terminal 23b of the second high-pass filter 23, and is connected to an output terminal 2 to which a device using bidirectional signals such as a data terminal is connected.
8, a second terminal 24b of the first low-pass filter 24 and a first terminal 23a of the second high-pass filter 23 are connected.
【0010】ハイパスフィルタ22、23は下り帯域信
号のみを通し、ローパスフィルタ24、25は上り帯域
信号のみを通す。センタより送出された下り帯域信号は
双方向伝送路より入力端子26に入力され、第1ハイパ
スフィルタ22の第1端子22a、第2端子22b、分
配器21の入力端子21aを通過して、分配器21によ
り分配器21の出力端子21bと21cから等分に分配
され出力される。分配器21の出力端子21bから出力
される下り帯域信号は出力端子27よりTV受像機等の
下り帯域信号のみを利用する装置に入力される。分配器
出力端子21cから出力される下り帯域信号は、第2ハ
イパスフィルタ23を通過して出力端子28よりデータ
端末等の双方向端末に入力される。The high-pass filters 22 and 23 pass only downstream band signals, and the low-pass filters 24 and 25 pass only upstream band signals. The downstream band signal transmitted from the center is input to the input terminal 26 from the bidirectional transmission path, passes through the first terminal 22a and the second terminal 22b of the first high-pass filter 22, and the input terminal 21a of the distributor 21, and is distributed. Is equally distributed from the output terminals 21b and 21c of the distributor 21 and output. The downstream band signal output from the output terminal 21b of the distributor 21 is input from the output terminal 27 to a device such as a TV receiver that uses only the downstream band signal. The downstream band signal output from the distributor output terminal 21c passes through the second high-pass filter 23 and is input from the output terminal 28 to a bidirectional terminal such as a data terminal.
【0011】一方、データ端末等の双方向端末より送出
された上り帯域信号は、出力端子28に入力され第1ロ
ーパスフィルタ24の第2端子24b、第1端子24a
を通過して入力端子26より双方向伝送路に出力されセ
ンタに送られる。この結果データ端末から送出される上
り帯域信号は分配器21を通過しないので、分配損失が
なくなるために雑音発生源である増幅器が不要となる。On the other hand, an upstream band signal transmitted from a bidirectional terminal such as a data terminal is input to an output terminal 28 and the second terminal 24b and the first terminal 24a of the first low-pass filter 24.
And output from the input terminal 26 to the bidirectional transmission path and sent to the center. As a result, the upstream band signal transmitted from the data terminal does not pass through the distributor 21, so that there is no distribution loss, so that an amplifier as a noise source is not required.
【0012】また、出力端子27より上り帯域の雑音が
入力した場合は、雑音は分配器21の出力端子21bに
入力され、雑音電力の半分は分配器21の内部抵抗にて
消費される。残りの半分は分配器21の入力端子21a
より出力され、第2ローパスフィルタ25の第1端子2
5a、第2端子25bを通過して終端抵抗29にてすべ
て消費される。上り帯域の雑音は第1ハイパスフィルタ
22によりセンタにつながる双方向伝送路には出力され
ず、また第2ローパスフィルタ25と終端抵抗29によ
りインピーダンス整合がとられているので反射されるこ
ともない。When noise in the upstream band is input from the output terminal 27, the noise is input to the output terminal 21b of the distributor 21, and half of the noise power is consumed by the internal resistance of the distributor 21. The other half is the input terminal 21a of the distributor 21.
From the first terminal 2 of the second low-pass filter 25
5a, the second terminal 25b passes through the terminal resistor 29, and is completely consumed. The noise in the upstream band is not output to the bidirectional transmission line connected to the center by the first high-pass filter 22, and is not reflected because the impedance is matched by the second low-pass filter 25 and the terminating resistor 29.
【0013】また、入力端子26、出力端子27、出力
端子28のどこから見ても上り帯域、下り帯域共にイン
ピーダンス整合がとれているので、送受端で信号の反射
もなく効率よく伝送される。In addition, since impedance matching is ensured in both the up band and the down band from any point of the input terminal 26, the output terminal 27, and the output terminal 28, signals are efficiently transmitted without reflection at the transmitting and receiving ends.
【0014】ところで図1のように、図2の第2ローパ
スフィルタ25と終端抵抗29がなくても構わない。こ
こで図1の1〜4は図2の21〜24に、図1の6〜8
は図2の26〜28に対応している。この場合、出力端
子8に入力された上り帯域信号は分配器1を通過せずに
入力端子6より双方向伝送路に出力されセンタに送られ
るので雑音発生源である増幅器が不要となる。また、出
力端子7より上り帯域の雑音が入力した場合、その雑音
は第1ハイパスフィルタ2によりセンタにつながる双方
向伝送路には出力されない。By the way, as shown in FIG. 1, the second low-pass filter 25 and the terminating resistor 29 shown in FIG. Here, 1 to 4 in FIG. 1 correspond to 21 to 24 in FIG. 2, and 6 to 8 in FIG.
Corresponds to 26 to 28 in FIG. In this case, the upstream band signal input to the output terminal 8 does not pass through the distributor 1 but is output from the input terminal 6 to the bidirectional transmission path and sent to the center, so that an amplifier as a noise source is not required. Also, when noise in the upstream band is input from the output terminal 7, the noise is not output to the bidirectional transmission path connected to the center by the first high-pass filter 2.
【0015】上記実施例では、双方向伝送路出力端子が
1つ、単方向伝送路出力端子が1つであるが、複数の単
方向伝送路出力端子が接続されていてもよい。図3に双
方向伝送路出力端子が1つ、単方向伝送路出力端子が3
つの場合を示す。図3の31〜36は図2の21〜26
に、図3の371〜373は図2の27に、図3の3
8、39は図2の28、29に対応する。分配器31は
4分配器である。出力端子371、372、373のど
こから上り帯域の雑音が入力しても、雑音は分配器31
に入力され、雑音電力の大部分は分配器31の内部抵抗
にて消費され、残りの雑音電力は分配器31の入力端子
31aより出力され、第2ローパスフィルタ35を通過
して終端抵抗39にてすべて消費される。上り帯域の雑
音は第1ハイパスフィルタ32によりセンタにつながる
双方向伝送路には出力されず、また第2ローパスフィル
タ35と終端抵抗39によりインピーダンス整合がとら
れているので反射されることもない。In the above embodiment, there is one bidirectional transmission line output terminal and one unidirectional transmission line output terminal, but a plurality of unidirectional transmission line output terminals may be connected. FIG. 3 shows one bidirectional transmission line output terminal and three unidirectional transmission line output terminals.
Two cases are shown. 3 are designated by reference numerals 31 to 36 in FIG.
3, 371 to 373 in FIG. 3 correspond to 27 in FIG.
8 and 39 correspond to 28 and 29 in FIG. The distributor 31 is a four-way distributor. No matter which of the output terminals 371, 372, 373, the noise in the upstream band is input,
, And most of the noise power is consumed by the internal resistance of the distributor 31, and the remaining noise power is output from the input terminal 31 a of the distributor 31 and passes through the second low-pass filter 35 to the terminating resistor 39. And all are consumed. The noise in the upstream band is not output to the bidirectional transmission line connected to the center by the first high-pass filter 32, and is not reflected because the impedance is matched by the second low-pass filter 35 and the terminating resistor 39.
【0016】また、上記実施例の分配器21を分岐器と
してもよい。例えば図2において分配器21を分岐器2
1としたとき、分岐器21の分岐端子を21b、出力端
子を21cとしても、また逆に出力端子を21b、分岐
端子を21cにしても構わない。The distributor 21 of the above embodiment may be a branch. For example, in FIG.
When it is set to 1, the branch terminal of the branching device 21 may be 21b and the output terminal may be 21c, and conversely, the output terminal may be 21b and the branch terminal may be 21c.
【図1】本発明の一実施例に係る双方向CATV用分岐
/分配装置の構成を示した回路図FIG. 1 is a circuit diagram showing a configuration of a bidirectional CATV branch / distribution apparatus according to an embodiment of the present invention.
【図2】本発明の他の実施例に係る双方向CATV用分
岐/分配装置の構成を示した回路図FIG. 2 is a circuit diagram showing a configuration of a bidirectional CATV branch / distribution apparatus according to another embodiment of the present invention.
【図3】本発明の他の実施例に係る双方向CATV用分
岐/分配装置の構成を示した回路図FIG. 3 is a circuit diagram showing a configuration of a bidirectional CATV branch / distribution apparatus according to another embodiment of the present invention.
【図4】従来の分配装置の構成を示した回路図FIG. 4 is a circuit diagram showing a configuration of a conventional distribution device.
【図5】その他の従来の分配装置の構成を示した回路図FIG. 5 is a circuit diagram showing a configuration of another conventional distribution device.
【図6】従来の伝送路接続装置の構成を示した回路図FIG. 6 is a circuit diagram showing a configuration of a conventional transmission line connection device.
1、21、41、51 …2分
配器 31 …4分
配器 2、22、32、42、52、62 …第1
ハイパスフィルタ 3、23、33、531、532 …第2
ハイパスフィルタ 4、24、34、541、542 …第1
ローパスフィルタ 25、35、65 …第2
ローパスフィルタ 6、26、36、46、56、66 …双方
向伝送路入力端子 7、27、371、372、373、47、67…単方
向伝送路出力端子 8、28、38、48、581、582 …双方
向伝送路出力端子 29、39、69 …終端
抵抗1, 21, 41, 51 ... two distributors 31 ... four distributors 2, 22, 32, 42, 52, 62 ... first
High-pass filter 3, 23, 33, 531, 532 ... second
High-pass filter 4, 24, 34, 541, 542 ... first
Low-pass filter 25, 35, 65 ... second
Low-pass filter 6, 26, 36, 46, 56, 66 ... bidirectional transmission path input terminal 7, 27, 371, 372, 373, 47, 67 ... unidirectional transmission path output terminal 8, 28, 38, 48, 581, 582 ... bidirectional transmission line output terminal 29, 39, 69 ... terminator
Claims (2)
送路及び少なくとも1つの単方向伝送路に分岐/分配す
る装置において、 入力端子に第1ハイパスフィルタの第1端子と第1ロー
パスフィルタの第1端子とを接続し、 双方向伝送路出力端子に前記第1ローパスフィルタの第
2端子と第2ハイパスフィルタの第1端子を接続し、 分岐/分配器入力端子に前記第1ハイパスフィルタの第
2端子を、一方の分岐/分配器出力端子に前記第2ハイ
パスフィルタの第2端子を、他方の分岐/分配器出力端
子に単方向伝送路出力端子を接続したことを特徴とする
双方向分岐/分配装置。An apparatus for branching / distributing a bidirectional transmission line into at least one bidirectional transmission line and at least one unidirectional transmission line, wherein the input terminals include a first terminal of a first high-pass filter and a first low-pass filter. A first terminal; a second terminal of the first low-pass filter and a first terminal of the second high-pass filter connected to a bidirectional transmission path output terminal; and a branch / distributor input terminal connected to the first high-pass filter. A bidirectional connection wherein a second terminal is connected to one branch / distributor output terminal, the second terminal of the second high-pass filter is connected to the other branch / distributor output terminal, and a unidirectional transmission line output terminal is connected. Branch / distributor.
て、 前記分岐/分配器入力端子に第2ローパスフィルタの第
1端子を接続し、 前記第2ローパスフィルタの第2端子に終端抵抗を接続
したことを特徴とする双方向分岐/分配装置。2. The bidirectional branching / distributing device according to claim 1, wherein a first terminal of a second low-pass filter is connected to the branching / distributing input terminal, and a terminating resistor is connected to a second terminal of the second low-pass filter. A bidirectional branching / distributing device characterized by being connected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22748396A JP3356934B2 (en) | 1996-08-09 | 1996-08-09 | Branching / distributing device for bidirectional CATV |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22748396A JP3356934B2 (en) | 1996-08-09 | 1996-08-09 | Branching / distributing device for bidirectional CATV |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1056628A true JPH1056628A (en) | 1998-02-24 |
JP3356934B2 JP3356934B2 (en) | 2002-12-16 |
Family
ID=16861599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22748396A Expired - Lifetime JP3356934B2 (en) | 1996-08-09 | 1996-08-09 | Branching / distributing device for bidirectional CATV |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3356934B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002135749A (en) * | 2000-10-18 | 2002-05-10 | Maspro Denkoh Corp | Interactive catv system |
JP2007300178A (en) * | 2006-04-27 | 2007-11-15 | Maspro Denkoh Corp | Distributor |
-
1996
- 1996-08-09 JP JP22748396A patent/JP3356934B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002135749A (en) * | 2000-10-18 | 2002-05-10 | Maspro Denkoh Corp | Interactive catv system |
JP4589515B2 (en) * | 2000-10-18 | 2010-12-01 | マスプロ電工株式会社 | Interactive CATV system |
JP2007300178A (en) * | 2006-04-27 | 2007-11-15 | Maspro Denkoh Corp | Distributor |
Also Published As
Publication number | Publication date |
---|---|
JP3356934B2 (en) | 2002-12-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3886454A (en) | Control apparatus for a two-way cable television system | |
US5255267A (en) | Apparatus for combining broadband and baseband signal transmissions | |
US9781472B2 (en) | CATV entry adapter and method for distributing CATV and in-home entertainment signals | |
US8429695B2 (en) | CATV entry adapter and method utilizing directional couplers for MoCA signal communication | |
US20130133019A1 (en) | Broadband reflective phase cancelling network interface device | |
US20180167668A1 (en) | Catv entry adapter and method for distributing catv and in-home entertainment signals | |
US9807467B2 (en) | Upstream noise suppression circuits and related radio frequency subscriber drop equipment and methods | |
US6509994B2 (en) | Burst-mode analog transmitter | |
JP3015094B2 (en) | Distortion canceling method for optical fiber transmission system and its apparatus and system | |
AU704402B2 (en) | System to reduce gain variance and ingress in CATV return transmissions | |
US6570465B2 (en) | Multi-tap kit for cable television systems | |
JP3356934B2 (en) | Branching / distributing device for bidirectional CATV | |
EP1675288A2 (en) | An arrangement for the transmission of a data signal in a cable television network | |
US6006066A (en) | Transmission system with tap devices which reduce the effects of interference | |
US6600900B1 (en) | System and method providing bi-directional communication services between a service provider and a plurality of subscribers | |
EP1787456B1 (en) | Telephone line interface, side-tone attenuation circuit and method | |
JP3717366B2 (en) | CATV network system | |
JP2003124772A (en) | Turnout and distributor | |
EP1119969A1 (en) | Cable television tap including modem | |
JP4713009B2 (en) | Bifurcation device and protector | |
KR200217517Y1 (en) | United amplifier of MATV signal and CATV signal | |
KR200224151Y1 (en) | Rf signals branch terminal | |
JPH07307937A (en) | Up joint noise suppressing method for bidirectional catv system and relay amplifier to be used for the same | |
JPS6139774B2 (en) | ||
JP4215728B2 (en) | CATV system and connector used in the CATV system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081004 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091004 Year of fee payment: 7 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101004 Year of fee payment: 8 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111004 Year of fee payment: 9 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121004 Year of fee payment: 10 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20131004 Year of fee payment: 11 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term |