JPH01120985A - Subscriber circuit - Google Patents
Subscriber circuitInfo
- Publication number
- JPH01120985A JPH01120985A JP27979787A JP27979787A JPH01120985A JP H01120985 A JPH01120985 A JP H01120985A JP 27979787 A JP27979787 A JP 27979787A JP 27979787 A JP27979787 A JP 27979787A JP H01120985 A JPH01120985 A JP H01120985A
- Authority
- JP
- Japan
- Prior art keywords
- input
- modem
- terminal equipment
- circuit
- impedance
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 235000009419 Fagopyrum esculentum Nutrition 0.000 description 1
- 240000008620 Fagopyrum esculentum Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Interface Circuits In Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電話交換機における２線・４線変換機能を有す
る加入者回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subscriber circuit having a two-wire/four-wire conversion function in a telephone exchange.
従来、との穏の加入者回路では、通話路とインターフェ
ースする回路内の入出力インピーダンスの値が固定され
るか、値の異なる入出力インピーダンスを複数設けてス
イッチ及びストラップ線等によシエ事者が切換えている
。Conventionally, in conventional subscriber circuits, the value of the input/output impedance in the circuit that interfaces with the communication path is fixed, or multiple input/output impedances with different values are provided and connected by switches, strap lines, etc. is switching.
加入者回路において、入出力インピーダンスの値が固定
さｎている場合、インピーダンス値が端末装置としての
電話機のインピーダンス値と等しいときはこの電話機の
通話特性は非常に良いが、変復調装置（モデム）が端末
装置として接続されたときは電話機とモデムのインピー
ダンス値が異なるため伝送特性の劣化を招く。In the subscriber circuit, if the value of the input/output impedance is fixed, if the impedance value is equal to the impedance value of the telephone as a terminal device, the communication characteristics of this telephone are very good, but if the modem is When connected as a terminal device, the impedance values of the telephone and modem are different, resulting in deterioration of transmission characteristics.
また、異なる値の入出力インピーダンスを複数設けて工
事者が切り換える場合、加入者回路に接続される端末装
置が電話機かモデムかを調査するために工事者がわざわ
ざ加入者の所まで行き、入出力インピーダンス値を切ｐ
換えるという作業をしなければならないため煩わしく、
工事時間の増加を招くだけでなく、入出力インピーダン
ス値の誤り設定を免扛ない。In addition, when installing multiple input/output impedances with different values and having the installer switch between them, the installer must go to the subscriber's location to investigate whether the terminal device connected to the subscriber's circuit is a telephone or a modem, and then Cut the impedance value
It is troublesome because you have to go through the process of changing it.
This not only increases construction time, but also leads to incorrect settings of input and output impedance values.
本発明の加入者回路は２線・４線変換機能を有する電話
交換機の加入者回路において、特定の周波数信号全検出
する検出手段と、通話路とインターフェースする個所に
設定される入出力インピーダンスの値を前記検出手段の
出力に応じて変化させるインピーダンス制御手段と全備
える。The subscriber circuit of the present invention is a subscriber circuit of a telephone exchange having a 2-wire/4-wire conversion function, and includes a detection means for detecting all specific frequency signals, and an input/output impedance value set at a location that interfaces with a communication path. and impedance control means for changing the impedance according to the output of the detection means.
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加入者回路を示す構成図で
ある。ここでは、加入者端末装置（′ｒ）１２が発呼し
たとき、電流供給回路（Ｉ ＳＵＰ ）１１から直流電
流を供給する。このとき、トーン検出回路（ＴＤＥＴ
）ｌ Ｏによりてモデムからのアンサ−トーンを検出し
た場合、トーン検出回路１０はインピーダンス制御回路
（ＩＭＰＣＯＮ）４にモデムの入出力インピーダンス（
Ｚ１２ ＋ Ｚｚｔ）７．８を選択させる信号を出力す
るものとする。FIG. 1 is a block diagram showing a subscriber circuit according to an embodiment of the present invention. Here, when the subscriber terminal device ('r) 12 makes a call, a DC current is supplied from the current supply circuit (ISUP) 11. At this time, the tone detection circuit (TDET
)l O, when an answer tone from the modem is detected, the tone detection circuit 10 sends the input/output impedance (IMPCON) of the modem to the impedance control circuit (IMPCON) 4.
It is assumed that a signal for selecting Z12 + Zzt)7.8 is output.
第２図は入出力インピーダンスとして電話機のインピー
ダンス（Ｚｌｔ １Ｚ２１） ５ ｒ ６を設定したと
き、加入者回路に端末装置１２として電話機が接続され
た場合とモデムが接続された場合の伝送特性を示す。ま
た、第３図は入出力インピーダンスとしてモデムのイン
ピーダンス７．８を設定したとき、加入者回路に端末装
置１２として電話機が接続さ扛た場合とモデムが接続さ
扛た場合の伝送特性を示す。FIG. 2 shows the transmission characteristics when a telephone is connected as the terminal device 12 to the subscriber circuit and when a modem is connected, when the impedance of the telephone (Zlt 1Z21) 5 r 6 is set as the input/output impedance. FIG. 3 shows the transmission characteristics when a telephone is connected as the terminal device 12 to the subscriber circuit and when a modem is not connected, when the impedance of the modem is set to 7.8 as the input/output impedance.
第１図、第２図及び第３図を参照すると、端末装置１２
が発呼した場合、電流供給回路１１は端末装置１２に直
流電流全供給する。端末装置１２がモデムであれば、ア
ンサ−トーンが到来する。Referring to FIGS. 1, 2, and 3, the terminal device 12
When the terminal device 12 makes a call, the current supply circuit 11 supplies the entire DC current to the terminal device 12. If the terminal device 12 is a modem, an answer tone will arrive.
トーン検出回路１０は特定の周波数信号のアンサ−トー
ンを検出し、インピーダンス制御回路４にアンサ−トー
ンが到来していること全通知する。Tone detection circuit 10 detects an answer tone of a specific frequency signal and notifies impedance control circuit 4 of the arrival of the answer tone.
インピーダンス制御回路４はこれによシ入出力インピー
ダンス金モデムの入出力インピーダンス７゜８に切換え
る。もし、アンサ−トーンが到来しなければ、端末装置
１２は電話機であるため、入出力インピーダンスとして
電話機の入出力インピーダンス５，６を選択する。こｎ
により、端末装置１２として電話機及びモデムのいずれ
が接続されたとしても良好な伝送特性を得られる。なお
、第１図において、１はコーデック（Ｃ，０ＤＥＣ）、
２゜３は増幅回路（Ａ）、９は平衡回路網（ＢＭＷ）を
含み２線・４線変換機能金有するノ・イブリッド回路（
ＨＹＢ）である。The impedance control circuit 4 thereby switches the input and output impedance of the gold modem to 7.8. If an answer tone does not arrive, since the terminal device 12 is a telephone, the input/output impedances 5 and 6 of the telephone are selected as the input/output impedance. This
Therefore, good transmission characteristics can be obtained regardless of whether a telephone or a modem is connected as the terminal device 12. In addition, in FIG. 1, 1 is a codec (C, 0DEC),
2.3 is an amplifier circuit (A), 9 is a hybrid circuit (including a balanced circuit network (BMW) and has a 2-wire/4-wire conversion function).
HYB).
以上説明したように本発明によｎば、特定の周波数信号
全検出して通話路とインターフェースする個所に設定さ
扛る入出力インピーダンスの値を変化させることにより
、端末装置として電話機及びモデムのいずｎが接続され
たとしても良好な伝送特性に得ることができる。As explained above, according to the present invention, by detecting all specific frequency signals and changing the value of the input/output impedance set at the point where it interfaces with the communication path, it is possible to use a telephone or modem as a terminal device. Even if Zn is connected, good transmission characteristics can be obtained.
第１図、第２図及び第３図は本発明の一実施例金示す図
である。
４・・・・・・インピーダンス制御回路、５，６，７゜
８・・・−、ｔ 出力インピーダンス、９・・・・・・
ノ・イブリッド回路、１０・・・・・・トーン検出回路
、１２・・・・・・端末装置。
代理人 弁理士 内 原 音
□蕎Ｈ阿鼾FIGS. 1, 2, and 3 are views showing one embodiment of the present invention. 4... Impedance control circuit, 5, 6, 7° 8...-, t Output impedance, 9...
hybrid circuit, 10...Tone detection circuit, 12...Terminal device. Agent: Patent Attorney Oto Uchihara□Soba H Ano
Claims (1)
おいて、特定の周波数信号を検出する検出手段と、通話
路とインターフェースする個所に設定される入出力イン
ピーダンスの値を前記検出手段の出力に応じて変化させ
るインピーダンス制御手段とを備えることを特徴とする
加入者回路。In a subscriber circuit of a telephone exchange having a 2-wire/4-wire conversion function, a detection means for detecting a specific frequency signal and an input/output impedance value set at a point interfacing with a communication path are set as outputs of the detection means. and impedance control means for changing the impedance accordingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27979787A JPH01120985A (en) | 1987-11-04 | 1987-11-04 | Subscriber circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27979787A JPH01120985A (en) | 1987-11-04 | 1987-11-04 | Subscriber circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01120985A true JPH01120985A (en) | 1989-05-12 |
Family
ID=17616048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27979787A Pending JPH01120985A (en) | 1987-11-04 | 1987-11-04 | Subscriber circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01120985A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05111064A (en) * | 1991-10-14 | 1993-04-30 | Nec Corp | Main wire trunk for automatic telephone exchange |
| JP4771943B2 (en) * | 2004-04-23 | 2011-09-14 | ツカサ工業株式会社 | Powder sorting device |
-
1987
- 1987-11-04 JP JP27979787A patent/JPH01120985A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05111064A (en) * | 1991-10-14 | 1993-04-30 | Nec Corp | Main wire trunk for automatic telephone exchange |
| JP4771943B2 (en) * | 2004-04-23 | 2011-09-14 | ツカサ工業株式会社 | Powder sorting device |
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