JPWO2009022374A1 - xDSL communication system - Google Patents

xDSL communication system Download PDF

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JPWO2009022374A1
JPWO2009022374A1 JP2009527967A JP2009527967A JPWO2009022374A1 JP WO2009022374 A1 JPWO2009022374 A1 JP WO2009022374A1 JP 2009527967 A JP2009527967 A JP 2009527967A JP 2009527967 A JP2009527967 A JP 2009527967A JP WO2009022374 A1 JPWO2009022374 A1 JP WO2009022374A1
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bridge tap
line
communication system
telephone line
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長谷川　一知
一知 長谷川
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Fujitsu Telecom Networks Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/066—Telephone sets adapted for data transmision

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Abstract

電話回線を利用して通信装置間でデータ伝送するｘＤＳＬ通信システムに関し、電話回線の分岐回線に相当するブリッジタップによるデータ伝送特性に与える影響を緩和する。モデムを含む通信装置を接続してデータ伝送する電話回線１のブリッジタップ２に、このブリッジタップ２と同等の特性インピーダンスを有する延長線路５又はこの延長線路５と同等の特性の擬似線路を接続した構成とする。The present invention relates to an xDSL communication system that transmits data between communication devices using a telephone line, and mitigates the influence on the data transmission characteristics by a bridge tap corresponding to a branch line of the telephone line. An extension line 5 having a characteristic impedance equivalent to the bridge tap 2 or a pseudo line having a characteristic equivalent to that of the extension line 5 is connected to the bridge tap 2 of the telephone line 1 for transmitting data by connecting a communication device including a modem. The configuration.

Description

本発明は、電話回線を利用してデータ伝送するｘＤＳＬ通信システムに関する。   The present invention relates to an xDSL communication system that transmits data using a telephone line.

銅等の金属線からなる電話回線を利用してデータ通信を行うＡＤＳＬ（Ａｓｙｍｍｅｔｒｉｃ Ｄｉｇｉｔａｌ Ｓｕｂｓｃｒｉｂｅｒ Ｌｉｎｅ）通信システムやＶＤＳＬ（Ｖｅｒｙ ｈｉｇｈ ｓｐｅｅｄ Ｄｉｇｉｔａｌ Ｓｕｂｓｃｒｉｂｅｒ Ｌｉｎｅ）通信システムが普及しており、両者を総合してｘＤＳＬ通信システムと称するものであり、電話回線により通話を行う場合の音声信号は、例えば、３００〜３，４００Ｈｚの周波数帯域を利用するものであるが、ｘＤＳＬ通信システムに於いては、最大で３０ＭＨｚ程度の周波数帯域まで使用してデータ伝送するものである。   An ADSL (Asymmetric Digital Subscriber Line) communication system and a VDSL (Very high speed Digital Subscriber Line) communication system that perform data communication using a telephone line made of a metal wire such as copper are widely used. An audio signal used for communication over a telephone line uses, for example, a frequency band of 300 to 3,400 Hz. In an xDSL communication system, the maximum is about 30 MHz. The data is transmitted using up to the frequency band.

このｘＤＳＬ通信システムは、例えば、図６に示すように、モデムを含む通信装置３，４間を電話回線１により接続した構成として、通信装置３，４間でデータ通信を行うものであり、その電話回線１には、分岐回線、即ち、ブリッジタップ２が接続され、このブリッジタップ２に電話端末が接続される場合もある。この電話端末と電話交換機や音声信号とデータとを分離するフィルタ等については図示を省略している。   For example, as shown in FIG. 6, the xDSL communication system performs data communication between communication devices 3 and 4 as a configuration in which communication devices 3 and 4 including modems are connected by a telephone line 1. A branch line, that is, a bridge tap 2 is connected to the telephone line 1, and a telephone terminal may be connected to the bridge tap 2. The telephone terminal and the telephone exchange, the filter for separating the voice signal and the data, etc. are not shown.

又ブリッジタップ２は、通信装置３，４間でデータ通信する場合に、開放端と見做す状態となるから、その開放端からの反射波の影響により、信号レベルが大きく低下する帯域が生じて、伝送速度が低下することになる。そこで、開放端に、例えば、コンデンサと抵抗との直列回路を終端回路として接続することが提案されている。その場合の周波数０〜３０ＭＨｚの周波数範囲について、電話回線の特性インピーダンスを図７の（ａ）、終端回路のインピーダンスを（ｂ）にそれぞれ示す。即ち、コンデンサと抵抗との直列回路による終端回路は、比較的低い周波数帯域に於いて無視できないようなインピーダンス不整合となり、ｘＤＳＬ通信に於けるデータ伝送特性が低下する。   In addition, the bridge tap 2 is regarded as an open end when data communication is performed between the communication devices 3 and 4, so that a band in which the signal level is greatly reduced is generated due to the influence of the reflected wave from the open end. As a result, the transmission speed decreases. Therefore, it has been proposed to connect, for example, a series circuit of a capacitor and a resistor to the open end as a termination circuit. FIG. 7A shows the characteristic impedance of the telephone line and FIG. 7B shows the impedance of the termination circuit in the frequency range of frequency 0 to 30 MHz in that case. That is, the termination circuit formed of a series circuit of a capacitor and a resistor has impedance mismatch that cannot be ignored in a relatively low frequency band, and data transmission characteristics in xDSL communication are degraded.

又ブリッジタップによる影響を緩和する為に、例えば、抵抗とコンデンサとを含む終端回路と、フィルタ構成のノイズ除去回路とをブリッジタップに接続した構成が提案されている（例えば、特許文献１参照）。又ブリッジタップに、このブリッジタップのインピーダンスに相当する抵抗、又はハイパスフィルタと抵抗、又は更にローパスフィルタを介して電話端末を接続する構成が提案されている（例えば、特許文献２参照）。又ブリッジタップに接続したモジュラジャックに、複数種類の終端回路とそれらを選択して接続する為のスイッチとを設けた構成も提案されている（例えば、特許文献３参照）。
特開２００４−１５１０９号公報 特開２００４−２６０６１０号公報 特開２００５−３４０８９７号公報 In order to reduce the influence of the bridge tap, for example, a configuration in which a termination circuit including a resistor and a capacitor and a noise elimination circuit having a filter configuration are connected to the bridge tap has been proposed (for example, see Patent Document 1). . Also, a configuration has been proposed in which a telephone terminal is connected to a bridge tap via a resistor corresponding to the impedance of the bridge tap, or a high-pass filter and a resistor, or further a low-pass filter (see, for example, Patent Document 2). There has also been proposed a configuration in which a modular jack connected to a bridge tap is provided with a plurality of types of termination circuits and a switch for selecting and connecting them (see, for example, Patent Document 3).
JP 2004-15109 A JP 2004-260610 A JP 2005-340897 A

電話回線を利用したｘＤＳＬ通信システムに於いて、データ伝送特性に与えるブリッジタップの影響を緩和する為に、従来から前述のように、各種の手段が提案されている。しかし、抵抗とコンデンサとを含む構成の終端回路をブリッジタップに接続した構成の場合、データ伝送帯域の中の一部について有効であるとしても、全データ伝送帯域について有効ではなかった。又モジュラジャックに複数種類の終端回路と選択スイッチとを設けた構成の場合は、コストアップとなると共に、比較的広いデータ伝送帯域にわたってブリッジタップの影響を緩和することは困難である。   In the xDSL communication system using a telephone line, various means have been proposed in the past as described above in order to reduce the influence of bridge taps on data transmission characteristics. However, in the case of a configuration in which a termination circuit having a configuration including a resistor and a capacitor is connected to a bridge tap, even if it is effective for a part of the data transmission band, it is not effective for the entire data transmission band. In the case where the modular jack is provided with a plurality of types of termination circuits and selection switches, the cost is increased and it is difficult to reduce the influence of the bridge tap over a relatively wide data transmission band.

本発明は、前述の従来の問題点を解決するもので、全データ伝送帯域にわたり、ブリッジタップによるデータ伝送特性に与える影響を緩和することを目的とする。   The present invention solves the above-described conventional problems, and an object thereof is to alleviate the influence of bridge taps on data transmission characteristics over the entire data transmission band.

本発明のｘＤＳＬ通信システムは、電話回線を介してデータ伝送するｘＤＳＬ通信システムに於いて、電話回線のブリッジタップに、延長線路を接続した構成とする。   The xDSL communication system of the present invention has a configuration in which an extension line is connected to a bridge tap of a telephone line in the xDSL communication system that transmits data via the telephone line.

又電話回線のブリッジタップに、該ブリッジタップと同等の特性インピーダンスを有する延長線路を接続することができる。又この延長線路と同等の伝達特性を有する擬似線路をブリッジタップに接続することができる。又この延長線路と同等の伝達特性を有する集中定数回路をブリッジタップに接続することができる。   An extension line having a characteristic impedance equivalent to that of the bridge tap can be connected to the bridge tap of the telephone line. A pseudo line having a transmission characteristic equivalent to that of the extension line can be connected to the bridge tap. A lumped constant circuit having a transmission characteristic equivalent to that of the extension line can be connected to the bridge tap.

ｘＤＳＬ通信システムに於ける全データ伝送帯域にわたって、ブリッジタップによる影響を緩和することが可能であり、安定且つ高速のデータ伝送特性を得ることが可能となる。   The influence of the bridge tap can be reduced over the entire data transmission band in the xDSL communication system, and stable and high-speed data transmission characteristics can be obtained.

本発明の実施例１の説明図である。It is explanatory drawing of Example 1 of this invention. ブリッジタップによる伝達特性の説明図である。It is explanatory drawing of the transfer characteristic by a bridge tap. ブリッジタップ長に対するＶＤＳＬ伝送速度のシミュレーション結果の説明図である。It is explanatory drawing of the simulation result of the VDSL transmission rate with respect to bridge | bridging tap length. 本発明の実施例２の説明図である。It is explanatory drawing of Example 2 of this invention. 本発明の実施例２の説明図である。It is explanatory drawing of Example 2 of this invention. 従来例のブリッジタップの説明図である。It is explanatory drawing of the bridge tap of a prior art example. 終端回路と電話回線とのインピーダンス特性説明図である。It is impedance characteristic explanatory drawing of a termination circuit and a telephone line.

本発明のｘＤＳＬ通信システムは、図１を参照すると、電話回線１のブリッジタップ２に、このブリッジタップ２と同等の特性インピーダンスを有する延長線路５を接続した構成とする。   Referring to FIG. 1, the xDSL communication system of the present invention has a configuration in which an extension line 5 having a characteristic impedance equivalent to that of the bridge tap 2 is connected to the bridge tap 2 of the telephone line 1.

図１は、本発明の実施例１の説明図であり、電話回線１を介してモデムを含む通信装置３，４を接続し、ブリッジタップ２に延長線路５を接続する。このブリッジタップ２の入力インピーダンスＺＢＴは、
ＺＢＴ＝Ｚ０ｃｏｓｈ（γｄ）／ｓｉｎｈ（γｄ）＝Ｚ０／ｔａｎｈ（γｄ）・・（１）
と表すことができる。なお、Ｚ０は特性インピーダンス、γは伝搬定数、ｄはブリッジタップの線路長を示す。即ち、線路長ｄを充分に長くすることにより、（１）式のｔａｎｈ（γｄ）は１に近付き、それにより、入力インピーダンスＺＢＴは、特性インピーダンスＺ０に近付くことになる。FIG. 1 is an explanatory diagram of Embodiment 1 of the present invention, in which communication devices 3 and 4 including a modem are connected via a telephone line 1 and an extension line 5 is connected to a bridge tap 2. The input impedance ZBT of this bridge tap 2 is
Z BT = Z 0 cosh (γd ) / sinh (γd) = Z 0 / tanh (γd) ·· (1)
It can be expressed as. Z 0 is a characteristic impedance, γ is a propagation constant, and d is a line length of the bridge tap. That is, when the line length d is made sufficiently long, tanh (γd) in the equation (1) approaches 1 so that the input impedance Z BT approaches the characteristic impedance Z 0 .

図２は、ブリッジタップの有無による伝達特性の一例を示すもので、縦軸を利得（Ｇａｉｎ〔ｄＢ〕）、横軸を周波数（Ｆｒｅｑｕｅｎｃｙ〔ＭＨｚ〕）として、０〜３０ＭＨｚの周波数範囲に於ける伝達特性を示し、ブリッジタップなしの場合に比較して、ブリッジタップ長無限大の場合は、３ｄＢ程度低い利得となるが、周波数の増加に従って減少する傾向は類似したものとなる。これらに対して、ブリッジタップ長が２ｍの場合、２４ＭＨｚ近傍に於いて大きな谷が生じる特性となり、この２４ＭＨｚ近傍の周波数帯をデータ伝送には充分には利用できなくなる。又ブリッジタップ長が２０ｍの場合は、周期的に小さい谷が生じる特性となる。即ち、ブリッジタップ長が充分に長い場合、例えば、前述の線路長ｄが充分に長い場合、伝達特性の大きな谷が生じることはなくなる。実際には、電話回線の種別にもよるが、数１００ｍ程度以上であれば、伝達特性の谷は充分に小さくなり、ｘＤＳＬ通信システムとして、所望のデータ伝送特性とすることができる。   FIG. 2 shows an example of transfer characteristics depending on the presence or absence of a bridge tap. In the frequency range of 0 to 30 MHz, the vertical axis represents gain (Gain [dB]) and the horizontal axis represents frequency (Frequency [MHz]). Compared to the case without a bridge tap, the gain is about 3 dB lower when the bridge tap length is infinite, but the tendency to decrease as the frequency increases is similar. On the other hand, when the bridge tap length is 2 m, a large valley is generated in the vicinity of 24 MHz, and the frequency band in the vicinity of 24 MHz cannot be sufficiently used for data transmission. In addition, when the bridge tap length is 20 m, it becomes a characteristic that small valleys are periodically generated. That is, when the bridge tap length is sufficiently long, for example, when the above-described line length d is sufficiently long, a trough having a large transfer characteristic does not occur. Actually, although it depends on the type of the telephone line, if it is about several hundred meters or more, the valley of the transfer characteristic becomes sufficiently small, and the xDSL communication system can have a desired data transmission characteristic.

図３は、ブリッジタップの長さ〔ｍ〕を０〜５００ｍとして、ＶＤＳＬ伝送速度〔Ｍｂｐｓ〕の変化のシミュレーション結果を示すものであり、ブリッジタップ長が５０ｍ程度までは、伝送速度は比較的大きな変化を有するものとなるが、それ以上の長さでは、伝送速度の変化は小さいものとなる。又４００ｍ程度以上では、伝送速度は、ほぼ一定値に収束するものとなった。即ち、ブリッジタップ長が４００ｍ等のように、充分に長ければ、電話回線を介して伝送するＶＤＳＬ信号に与える影響は小さくなることを示し、所望の伝送速度を維持することが可能となる。   FIG. 3 shows a simulation result of changes in the VDSL transmission rate [Mbps] when the bridge tap length [m] is 0 to 500 m. The transmission rate is relatively large until the bridge tap length is about 50 m. Although there is a change, if the length is longer, the change in the transmission rate is small. When the speed is about 400 m or more, the transmission speed converges to a substantially constant value. That is, if the bridge tap length is sufficiently long, such as 400 m, the influence on the VDSL signal transmitted via the telephone line is reduced, and a desired transmission rate can be maintained.

図４は、本発明の実施例２の説明図であり、図１と同一符号は同一名称部分を示し、６は擬似線路である。この擬似線路６は、延長線路５の特性と同等な伝達特性を有する線路を示し、この擬似線路６は、分布定数回路として実現することも可能であるが、集中定数回路で実現することも可能であり、この集中定数回路で実現した例を図５に示す。即ち、インダクタンスＬと抵抗Ｒ１，Ｒ２とコンデンサＣとにより構成することができる。なお、インダクタンスと抵抗とコンデンサとを含む集中定数回路の構成は、図５に示す接続構成以外の接続構成で実現することも可能である。又この擬似線路６の一方に前述の電話回線のブリッジタップを接続し、状況に応じて他方に図示を省略した電話端末を接続することになる。   FIG. 4 is an explanatory diagram of Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 denote the same names, and 6 denotes a pseudo line. This pseudo line 6 indicates a line having a transmission characteristic equivalent to the characteristic of the extension line 5, and this pseudo line 6 can be realized as a distributed constant circuit, but can also be realized as a lumped constant circuit. FIG. 5 shows an example realized by this lumped constant circuit. That is, it can be constituted by an inductance L, resistors R1 and R2, and a capacitor C. Note that the configuration of the lumped constant circuit including the inductance, the resistor, and the capacitor can be realized by a connection configuration other than the connection configuration illustrated in FIG. In addition, the above-described telephone line bridge tap is connected to one of the pseudo lines 6 and a telephone terminal (not shown) is connected to the other depending on the situation.

産業上の利用の可能性Industrial applicability

ブリッジタップを含む種々の敷設構成の電話回線を利用したＡＤＳＬ，ＶＤＳＬ等のｘＤＳＬ通信システムに適用可能であり、全データ伝送帯域にわたり、ブリッジタップによるデータ伝送特性に与える影響を緩和して、安定な高速通信を可能となる。   It can be applied to xDSL communication systems such as ADSL and VDSL using telephone lines with various laying configurations including bridge taps. High-speed communication is possible.

Claims (4)

電話回線を介してデータ伝送するｘＤＳＬ通信システムに於いて、
前記電話回線のブリッジタップに、延長線路を接続したことを特徴とするｘＤＳＬ通信システム。In an xDSL communication system that transmits data via a telephone line,
An xDSL communication system, wherein an extension line is connected to a bridge tap of the telephone line. 前記電話回線のブリッジタップに、該ブリッジタップと同等の特性インピーダンスを有する延長線路を接続したことを特徴とする請求項１記載のｘＤＳＬ通信システム。   The xDSL communication system according to claim 1, wherein an extension line having a characteristic impedance equivalent to that of the bridge tap is connected to the bridge tap of the telephone line. 前記電話回線のブリッジタップに、前記延長線路と同等の伝達特性を有する擬似線路を接続したことを特徴とする請求項１記載のｘＤＳＬ通信システム。   2. The xDSL communication system according to claim 1, wherein a pseudo line having a transfer characteristic equivalent to that of the extension line is connected to a bridge tap of the telephone line. 前記電話回線のブリッジタップに、前記延長線路と同等の伝達特性を有する集中定数回路を接続したことを特徴とする請求項１記載のｘＤＳＬ通信システム。   2. The xDSL communication system according to claim 1, wherein a lumped constant circuit having a transfer characteristic equivalent to that of the extension line is connected to a bridge tap of the telephone line.
JP2009527967A 2007-08-10 2007-08-10 xDSL communication system Pending JPWO2009022374A1 (en)

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