JPH03250962A - Sealing current supply system - Google Patents

Sealing current supply system

Info

Publication number
JPH03250962A
JPH03250962A JP2047978A JP4797890A JPH03250962A JP H03250962 A JPH03250962 A JP H03250962A JP 2047978 A JP2047978 A JP 2047978A JP 4797890 A JP4797890 A JP 4797890A JP H03250962 A JPH03250962 A JP H03250962A
Authority
JP
Japan
Prior art keywords
digital subscriber
circuit
subscriber circuit
current supply
connection
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
Application number
JP2047978A
Other languages
Japanese (ja)
Inventor
Kenji Tsutsumi
堤 謙二
Noboru Ise
伊勢 登
Ryoji Shimozono
下園 良二
Kenji Fujiwara
健二 藤原
Yasuo Tanaka
康夫 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Fujitsu Communication Systems Ltd
Original Assignee
Fujitsu Ltd
Fujitsu Communication Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, Fujitsu Communication Systems Ltd filed Critical Fujitsu Ltd
Priority to JP2047978A priority Critical patent/JPH03250962A/en
Publication of JPH03250962A publication Critical patent/JPH03250962A/en
Pending legal-status Critical Current

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  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To simplify the circuit and to utilize a cable connection section by allowing a connection control means to control each connection means synchronously with a time when a test equipment is connected to each digital subscriber circuit and connecting each digital subscriber circuit to a DC current supply means sequentially one by one circuit. CONSTITUTION:A connection control section 122 selects periodically one by one line of each digital subscriber circuit 11 (e.g. once a day, mainly at night) to confirm the normality of each digital subscriber circuit 11 and each digital subscriber line 2 and activates a built-in UA relay 112 to operate an SC relay 114 provided in the selected digital subscriber circuit 11 prior to the connection to a test equipment (not shown) via a test use drawing line 14 and a selector 13. A DC current supply circuit 132 receives an external DC power supply (e.g. -48V) and supplies a prescribed DC current (i) (e.g. 20mA) to the digital subscriber line 2 accommodated in the selected digital subscriber circuit 11 via the test use drawing line 14 and a closed contact sc.

Description

【発明の詳細な説明】 [概要] ディジタル交換機におけるシーリングカレント供給方式
に関し、 ディジタル加入者回路の経済化および小型化を損なうこ
と無く、ディジタル加入線にケーブル接続部の活性化を
図る為の直流電流(シーリングカレント)を供給するこ
とを目的とし、 ディジタル加入者回路に接続された場合に、ディジタル
加入者回路に収容されるディジタル加入線に所定の直流
電流を供給する直流電流供給手段を、複数のディジタル
加入者回路に共通に設け、各ディジタル加入者回路をそ
れぞれ直流電流供給手段に接続する接続手段を各ディジ
タル加入者回路に設け、試験装置を各ディジタル加入者
回路に接続する時期に同期して各接続手段を制御し、各
ディジタル加入者回路を一回路宛、直流電流供給手段に
順次接続させる接続制御手段を設ける様に構成する。
[Detailed Description of the Invention] [Summary] Regarding a ceiling current supply method in a digital exchange, a direct current is used to activate cable connections to digital subscriber lines without sacrificing economy and miniaturization of digital subscriber circuits. (ceiling current), and when connected to a digital subscriber circuit, a plurality of DC current supply means are used to supply a predetermined DC current to a digital subscriber line housed in the digital subscriber circuit. Connecting means is provided in common to the digital subscriber circuits and connects each digital subscriber circuit to the DC current supply means, and the connection means is provided in each digital subscriber circuit to connect the test equipment to each digital subscriber circuit. A connection control means is provided which controls each connection means and sequentially connects each digital subscriber circuit to the direct current supply means one circuit at a time.

[産業上の利用分野〕 本発明は、ディジタル交換機におけるシーリングカレン
ト供給方式に関する。
[Industrial Application Field] The present invention relates to a ceiling current supply system in a digital exchange.

ディジタル交換機に収容される二線式のディジタル加入
線は、通常交換局から加入者宅比−本のケーブルで構成
されることは無く、複数本のケーブルが縦続接続される
ことにより構成されている。
A two-wire digital subscriber line accommodated in a digital exchange usually does not consist of a single cable from the exchange center to the subscriber's premises, but instead consists of multiple cables connected in cascade. .

各ケーブルの接続部は、接続される両方のケーブルの芯
線を互いに縫合わせただけの場合が多く、時間の経過と
共に接触抵抗が増大し、線路損失が増加する恐れがある
In many cases, the connection portion of each cable is simply the core wires of both cables to be connected, which are simply sewn together, and as time passes, there is a risk that contact resistance will increase and line loss will increase.

この種の接触抵抗の増大を防止する手段として、ディジ
タル加入線に所定(例えば20ミリアンペア程度)の直
流電流(シーリングカレントとも称する)を周期的に流
し、ケーブルの接続部を活性化することが有効とされて
いる。
As a means to prevent this type of increase in contact resistance, it is effective to periodically flow a predetermined (for example, about 20 milliampere) direct current (also called sealing current) through the digital joining line to activate the cable connection. It is said that

〔従来の技術〕[Conventional technology]

第3図は従来あるディジタル加入者回路シェルフの一例
を示す図である。
FIG. 3 is a diagram showing an example of a conventional digital subscriber circuit shelf.

第3図において、ディジタル加入者回路シェルフlには
、複数のディジタル加入者回路11と、各ディジタル加
入者回路11に共通に設けられた共通制御装置12およ
びセレクタ13とが設けられている。
In FIG. 3, a digital subscriber circuit shelf l is provided with a plurality of digital subscriber circuits 11, and a common control device 12 and a selector 13 that are commonly provided to each digital subscriber circuit 11.

各ディジタル加入者回路11には、加入者宅内に設けら
れた網終端装置3が、それぞれディジタル加入線2を経
由して接続されている。
Each digital subscriber circuit 11 is connected to a network termination device 3 provided in the subscriber's premises via a digital subscriber line 2, respectively.

各ディジタル加入者回路11内には、それぞれディジタ
ル加入線2を経由して網終端装置3との間で、ディジタ
ル信号を送受信する伝送回路111と、試験引込み用の
UAリレー112とが設けられ、また共通制御装置12
内には、試験対象ディジタル加入者回路11を一回路宛
選択する接続制御部121が設けられ、更にセレクタ1
3内にはRLリレー131が設けられている。
Each digital subscriber circuit 11 is provided with a transmission circuit 111 that transmits and receives digital signals to and from the network termination device 3 via the digital subscriber line 2, and a UA relay 112 for test lead-in. Also, the common control device 12
A connection control unit 121 for selecting one digital subscriber circuit 11 to be tested is provided therein, and a selector 1
3, an RL relay 131 is provided.

接続制御部121は、各ディジタル加入者回路11を周
期的に(例えば−日に一回、主として夜間に)一回路宛
順次選択し、内蔵するUAリレー112を動作させると
共に、セレクタ13に設けられているRLリレー131
を動作させ、選択したディジタル加入者回路11の通話
路を、接点Ua、試験用引込線14および接点rlを経
由して、図示されぬ試験装置に接続し、ディジタル加入
線2の試験、並びにディジタル加入者回路11の試験を
各ディジタル加入者回路11毎に順次実行し、それぞれ
の正常性を確認する。
The connection control unit 121 periodically selects each digital subscriber circuit 11 (for example, once a day, mainly at night), operates the built-in UA relay 112, and operates the built-in UA relay 112. RL relay 131
is operated, and the communication path of the selected digital subscriber circuit 11 is connected to a test device (not shown) via the contact Ua, the test lead-in line 14, and the contact rl, and the digital subscriber circuit 2 is tested and the digital subscriber circuit 11 is tested. The test of the subscriber circuit 11 is sequentially executed for each digital subscriber circuit 11 to confirm the normality of each subscriber circuit 11.

なお各テ゛イジタル加入者回路11には、ディジタル加
入線2を経由して網終端装置3に直流電流iを供給する
機能が設けられていない為、ディジタル加入線2を構成
する複数のケーブル相互のケーブル接続部21の活性化
は図れず、ディジタル加入線2の線路損失が時間の経過
と共に増加する恐れがある。
Note that since each digital subscriber circuit 11 is not provided with a function of supplying direct current i to the network termination device 3 via the digital subscriber line 2, the cables between the plurality of cables constituting the digital subscriber line 2 are The connection portion 21 cannot be activated, and there is a possibility that the line loss of the digital joining line 2 will increase over time.

(発明が解決しようとする課題〕 以上の説明から明らかな如く、従来あるディジタル加入
者回路シェルフにおいては、ディジタル加入線2にケー
ブル接続部21の活性化を図る手段が設けられていなか
った為、時間の経過と共に接触抵抗が増大し、線路損失
が増加する恐れがあった。
(Problems to be Solved by the Invention) As is clear from the above explanation, in the conventional digital subscriber circuit shelf, the digital subscriber line 2 was not provided with a means for activating the cable connection section 21. There was a risk that contact resistance would increase over time and line loss would increase.

かかる問題点の防止策として、各ディジタル加入者回路
11に直流電流供給回路113を設け、ディジタル加入
線2に対して周期的に所定の直流tiiを供給し、ケー
ブル接続部21を活性化させることにより、接触抵抗の
増大防止を図ることも考慮されるが、各ディジタル加入
者回路11に直流を流供給回路113を設ける必要があ
り、ディジタル加入者回路の経済化および小型化を損な
うこととなり、適切な解決策とは成り得ない。
As a measure to prevent this problem, each digital subscriber circuit 11 is provided with a DC current supply circuit 113, and a predetermined DC current tii is periodically supplied to the digital subscriber line 2 to activate the cable connection section 21. Therefore, it is considered to prevent an increase in contact resistance, but it is necessary to provide a direct current supply circuit 113 to each digital subscriber circuit 11, which impairs economicalization and miniaturization of the digital subscriber circuit. It can't be a proper solution.

本発明は、ディジタル加入者回路の経済化および小型化
を損なうこと無く、ディジタル加入線にケーブル接続部
の活性化を図る為の直流電流(シーリングカレント)を
供給することを目的とする。
SUMMARY OF THE INVENTION An object of the present invention is to supply a direct current (ceiling current) to a digital subscriber line for activating a cable connection portion without impairing economicalization and miniaturization of digital subscriber circuits.

〔課題を解決するための手段〕[Means to solve the problem]

第1図は本発明の原理を示す図である。 FIG. 1 is a diagram showing the principle of the present invention.

第1図において、2はディジタル加入線、11は各ディ
ジタル加入綿2を収容するディジタル加入者回路、10
0は、周期的に一回路宛接続されるディジタル加入者回
路11を経由してディジタル加入wA2およびディジタ
ル加入者回路11の試験を実行する試験装置である。
In FIG. 1, 2 is a digital subscriber line, 11 is a digital subscriber circuit accommodating each digital subscriber line 2, and 10 is a digital subscriber circuit.
0 is a test device that tests the digital subscription wA2 and the digital subscriber circuit 11 via the digital subscriber circuit 11 that is periodically connected to one circuit.

200は、本発明により複数のディジタル加入者回路1
1に共通に設けられた直流電流供給手段である。
200 comprises a plurality of digital subscriber circuits 1 according to the present invention.
1 is a direct current supply means provided in common.

300は、本発明により各ディジタル加入者回路11に
設けられた接続手段である。
Reference numeral 300 represents connection means provided in each digital subscriber circuit 11 according to the present invention.

400は、本発明により設けられた接続制御手段である
400 is a connection control means provided according to the present invention.

〔作用] 直流電流供給手段200は、ディジタル加入者回路11
に接続された場合に、該ディジタル加入者回路11に収
容されるディジタル加入線2に所定の直流電流を供給す
る。
[Function] The DC current supply means 200 connects the digital subscriber circuit 11
When connected to the digital subscriber circuit 11, a predetermined direct current is supplied to the digital subscriber line 2 accommodated in the digital subscriber circuit 11.

接続手段300は、各ディジタル加入者回路11をそれ
ぞれ直流電流供給手段200に接続する。
The connection means 300 connects each digital subscriber circuit 11 to the direct current supply means 200, respectively.

接続制御手段400は、試験装置100を各ディジタル
加入者回路11に接続する時期に同期して、各接続手段
300を制御し、各ディジタル加入者回路11を一回路
宛、直流電流供給手段200に順次接続させる。
The connection control means 400 controls each connection means 300 in synchronization with the timing of connecting the test device 100 to each digital subscriber circuit 11, and connects each digital subscriber circuit 11 to one circuit to the DC current supply means 200. Connect sequentially.

従って、直流電流供給手段を複数のディジタル加入者回
路に共通に設けるのみで、各ディジタル加入者回路毎に
設ける必要が無くなり、ディジタル加入者回路の経済化
および小型化を損なうこと無くケーブル接続部の活性化
を図る為の直流電流(シーリングカレント)を供給する
ことが可能となり、また直流電流供給手段の各ディジタ
ル加入者回路への接続は、試験装置の接続と同期して制
御される為、接続制御手段も簡易化が可能となる。
Therefore, by simply providing a DC current supply means in common to a plurality of digital subscriber circuits, there is no need to provide one for each digital subscriber circuit, and the cable connection portion can be easily reduced without impairing the economy and miniaturization of digital subscriber circuits. It is possible to supply direct current (ceiling current) for activation, and since the connection of the direct current supply means to each digital subscriber circuit is controlled in synchronization with the connection of the test equipment, the connection The control means can also be simplified.

(実施例〕 以下、本発明の一実施例を図面により説明する。(Example〕 An embodiment of the present invention will be described below with reference to the drawings.

第2図は本発明の一実施例によるディジタル加入者回路
シェルフを示す図である。なお、全図を通じて同一符号
は同一対象物を示す。
FIG. 2 is a diagram illustrating a digital subscriber circuit shelf in accordance with one embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

第2図においては、第1図における直流電流供給手段2
00として直流電流供給回路132がセレクタ13内に
設けられ、また第1図における接続手段300としてS
Cリレー114が各ディジタル加入者回路11内に設け
られ、また第1図における接続制御手段400として接
続制御部122が共通制御装置12内に設けられている
In FIG. 2, the direct current supply means 2 in FIG.
A DC current supply circuit 132 is provided in the selector 13 as 00, and S as connection means 300 in FIG.
A C relay 114 is provided in each digital subscriber circuit 11, and a connection control section 122 is provided in the common control device 12 as the connection control means 400 in FIG.

第2図において、接続制御部122は、第3図における
接続制御部121と同様に、各ディジタル加入者回路1
1およびディジタル加入線2の正常性を確認する為に、
一回路宛周期的に(例えば−日に一回、主として夜間に
)選択するが、内蔵するUAリレー112を動作させて
試験用引込線14およびセレクタ13を経由して、図示
されぬ試験装置に接続する前に、選択したディジタル加
入者回路11内に設けられているSCリレー114を動
作させる。
In FIG. 2, a connection control section 122 connects each digital subscriber circuit 1, similar to the connection control section 121 in FIG.
In order to confirm the normality of 1 and digital access line 2,
One circuit is selected periodically (for example, once a day, mainly at night), and the built-in UA relay 112 is operated and connected to a test device (not shown) via the test lead-in line 14 and selector 13. Before doing so, the SC relay 114 provided in the selected digital subscriber circuit 11 is activated.

動作したS C’Jシレー14の接点scは導通状態に
設定され、選択されたディジタル加入者回路11の通話
路を、直流電流供給線15を経由してセレクタ13内に
設けられている直流電流供給回路132に接続する。
The contact sc of the operated SC'J relay 14 is set to conductive state, and the communication path of the selected digital subscriber circuit 11 is connected to the DC current provided in the selector 13 via the DC current supply line 15. Connect to supply circuit 132.

直流電流供給回路132は、外部から直流電源(例えば
−48ボルト)を供給されて、試験用引込線14、並び
に導通状態に設定されている接点scを経由して、選択
されたディジタル加入者回路11に収容されているディ
ジタル加入vA2に所定の直流電流i (例えば20ミ
リアンペア)を供給する。
The DC current supply circuit 132 is supplied with DC power (for example, -48 volts) from the outside and supplies the selected digital subscriber circuit 11 via the test lead-in line 14 and the contact sc set in a conductive state. A predetermined direct current i (for example 20 milliamps) is supplied to the digital connection vA2 accommodated in the .

なおディジタル加入線2に接続されている網終端装置3
は、直流電流供給回路132から供給される直流電流i
の通電経路を内蔵している為、直流電流供給回路132
から供給される直流電流】はディジタル加入線2上を流
れ、ディジタル加入線2上に存在するケーブル接続部2
1を活性化する。
Note that the network termination device 3 connected to the digital access line 2
is the DC current i supplied from the DC current supply circuit 132
DC current supply circuit 132 has a built-in energizing path.
The direct current supplied from ] flows on the digital add-in line 2 and the cable connection 2 present on the digital add-in line 2
Activate 1.

接続制御部122は、ケーブル接続部21を活性化する
に充分な時間(例えば5秒乃至10秒間)、SCリレー
114を動作させた後、SCリレー114を復旧させ、
次に同一ディジタル加入者回路11内のUAリレー11
2を動作させ、前述と同様の過程でディジタル加入者回
路11およびディジタル加入線2の正常性の確認を開始
する。
The connection control unit 122 operates the SC relay 114 for a sufficient time (for example, 5 seconds to 10 seconds) to activate the cable connection unit 21, and then restores the SC relay 114.
Next, the UA relay 11 in the same digital subscriber circuit 11
2 is operated, and confirmation of the normality of the digital subscriber circuit 11 and the digital subscriber line 2 is started in the same process as described above.

以上の説明から明らかな如く、本実施例によれば、接続
制御部122が所定周期で各ディジタル加入者回路11
を順次選択し、ディジタル加入者回路11およびディジ
タル加入線2の正常性を確認する際に、選択されたディ
ジタル加入者回路11内に設けたSCリレー114を所
定時間動作させることにより、共通に設けられている直
流電流供給回路132からディジタル加入線2に所定の
直流電流iを供給し、ケーブル接続部21を活性化する
ことが可能となる為、各ディジタル加入者回路11にそ
れぞれ直流を流供給回路113(第3図)を設ける必要
も無くなり、また接続制御部122も従来ある接続制御
部121(第3図)に比し、SCリレー114を動作さ
せる為の機能追加のみで済み、ディジタル加入者回路シ
ェルフ1の経済化および小型化を損なうこと無くケーブ
ル接続部21の活性化が可能となる。
As is clear from the above description, according to this embodiment, the connection control unit 122 connects each digital subscriber circuit 11 at a predetermined period.
are sequentially selected and when confirming the normality of the digital subscriber circuit 11 and the digital subscriber line 2, by operating the SC relay 114 provided in the selected digital subscriber circuit 11 for a predetermined time, Since it is possible to supply a predetermined DC current i from the DC current supply circuit 132 that is connected to the digital subscriber line 2 to activate the cable connection section 21, it is possible to supply DC current to each digital subscriber circuit 11 respectively. There is no need to provide the circuit 113 (Fig. 3), and compared to the conventional connection control part 121 (Fig. 3), the connection control section 122 only requires the addition of a function to operate the SC relay 114, and digital connection is possible. The cable connection portion 21 can be activated without impairing the economy and miniaturization of the circuit shelf 1.

なお、第3図はあく迄本発明の一実施例に過ぎず、例え
ば複数のディジタル加入者回路11はディジタル加入者
回路シェルフ1を構成するものに限定されることは無く
、また直流電流供給回路132はセレクタ13内に設け
るものに限定されることは無く、他に幾多の変形が考慮
されるが、何れの場合にも本発明の効果は変わらない。
It should be noted that FIG. 3 is merely one embodiment of the present invention, and for example, the plurality of digital subscriber circuits 11 are not limited to those constituting the digital subscriber circuit shelf 1, and may also include a DC current supply circuit. 132 is not limited to being provided within the selector 13, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

また接続手段300および接続制御手段400は図示さ
れるものに限定されることは無く、他に幾多の変形が考
慮されるが、何れの場合にも本発明の効果は変わらない
Further, the connection means 300 and the connection control means 400 are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

〔発明の効果] 以上、本発明によれば、前記ディジタル交換機において
、直流電流供給手段を複数のディジタル加入者回路に共
通に設けるのみで、各ディジタル加入者回路毎に設ける
必要が無くなり、ディジタル加入者回路の経済化および
小型化を損なうこと無くケーブル接続部の活性化を図る
為の直流電流(シーリングカレント)を供給することが
可能となり、また直流電流供給手段の各ディジタル加入
者回路への接続は、試験装置の接続と同期しで制御され
る為、接続制御手段も簡易化が可能となる。
[Effects of the Invention] As described above, according to the present invention, in the digital exchange, the DC current supply means is simply provided in common to a plurality of digital subscriber circuits, and there is no need to provide it for each digital subscriber circuit. It is now possible to supply direct current (ceiling current) for activating cable connections without sacrificing economy and miniaturization of subscriber circuits, and it is also possible to connect direct current supply means to each digital subscriber circuit. Since this is controlled in synchronization with the connection of the test equipment, the connection control means can also be simplified.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の原理を示す図、第2図は本発明の一実
施例によるディジタル加入者回路シェルフを示す図、第
3図は従来あるディジタル加入者回路シェルフの一例を
示す図である。 図において、1はディジタル加入者回路シェルフ、2は
ディジタル加入線、3は網終端装置、11はディジタル
加入者回路、12は共通制御装置、13はセレクタ、1
4は試験用引込線、15は直流電流供給線、21はケー
ブル接続部、100は試験装置、111は伝送回路、1
12はUA’Jレー 113および132は直流電流供
給回路、114はSCリレー 121および122は接
続制御部、131はRLリレー 200は直流電流供給
手段、300は接続手段、400は接続制御手ツ00 2θθ $発明の原理図 第 111Z)
FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a digital subscriber circuit shelf according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a conventional digital subscriber circuit shelf. . In the figure, 1 is a digital subscriber circuit shelf, 2 is a digital access line, 3 is a network termination device, 11 is a digital subscriber circuit, 12 is a common control device, 13 is a selector, 1
4 is a test lead-in line, 15 is a DC current supply line, 21 is a cable connection part, 100 is a test device, 111 is a transmission circuit, 1
12 is a UA'J relay, 113 and 132 are DC current supply circuits, 114 is an SC relay, 121 and 122 are connection control units, 131 is an RL relay, 200 is a DC current supply means, 300 is a connection means, 400 is a connection control means 00 2θθ $ Principle Diagram of Invention No. 111Z)

Claims (1)

【特許請求の範囲】 それぞれディジタル加入線(2)を収容する複数のディ
ジタル加入者回路(11)を一回路宛、所定周期毎に順
次試験装置(100)に接続し、前記ディジタル加入線
(2)およびディジタル加入者回路(11)の試験を実
行するディジタル交換機において、 前記ディジタル加入者回路(11)に接続された場合に
、該ディジタル加入者回路(11)に収容されるディジ
タル加入線(2)に所定の直流電流を供給する直流電流
供給手段(200)を、前記複数のディジタル加入者回
路(11)に共通に設け、 前記各ディジタル加入者回路(11)をそれぞれ前記直
流電流供給手段(200)に接続する接続手段(300
)を前記各ディジタル加入者回路(11)に設け、 前記試験装置(100)を前記各ディジタル加入者回路
(11)に接続する時期に同期して前記各接続手段(3
00)を制御し、前記各ディジタル加入者回路(11)
を一回路宛、前記直流電流供給手段(200)に順次接
続させる接続制御手段(400)を設けることを特徴と
するシーリングカレント供給方式。
[Scope of Claims] A plurality of digital subscriber circuits (11) each accommodating a digital access line (2) are sequentially connected to the test device (100) at predetermined intervals for one circuit, and the digital access line (2) ) and a digital subscriber circuit (11) in a digital exchange that tests the digital subscriber circuit (11), when connected to the digital subscriber circuit (11), the digital subscriber circuit (2) accommodated in the digital subscriber circuit (11). A DC current supply means (200) for supplying a predetermined DC current to the plurality of digital subscriber circuits (11) is provided in common to the plurality of digital subscriber circuits (11), and each digital subscriber circuit (11) is connected to the DC current supply means (200), respectively. connection means (300) connected to
) is provided in each of the digital subscriber circuits (11), and each of the connection means (3
00) and each digital subscriber circuit (11)
A ceiling current supply system characterized in that a connection control means (400) is provided for sequentially connecting one circuit to the direct current supply means (200).
JP2047978A 1990-02-28 1990-02-28 Sealing current supply system Pending JPH03250962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2047978A JPH03250962A (en) 1990-02-28 1990-02-28 Sealing current supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2047978A JPH03250962A (en) 1990-02-28 1990-02-28 Sealing current supply system

Publications (1)

Publication Number Publication Date
JPH03250962A true JPH03250962A (en) 1991-11-08

Family

ID=12790405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2047978A Pending JPH03250962A (en) 1990-02-28 1990-02-28 Sealing current supply system

Country Status (1)

Country Link
JP (1) JPH03250962A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006052288A1 (en) * 2004-11-10 2006-05-18 Alcatel Lucent Control circuit for causing cyclic application of sealing current for local loops supporting data network telephony
EP1843566A1 (en) 2006-04-03 2007-10-10 Huawei Technologies Co., Ltd. Method and devices for providing wetting current

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5599870A (en) * 1979-01-23 1980-07-30 Nec Corp Detection system for alternating current induction
JPH0248849A (en) * 1988-08-10 1990-02-19 Fujitsu Ltd Digital subscriber line fault monitor system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5599870A (en) * 1979-01-23 1980-07-30 Nec Corp Detection system for alternating current induction
JPH0248849A (en) * 1988-08-10 1990-02-19 Fujitsu Ltd Digital subscriber line fault monitor system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006052288A1 (en) * 2004-11-10 2006-05-18 Alcatel Lucent Control circuit for causing cyclic application of sealing current for local loops supporting data network telephony
CN101057487A (en) * 2004-11-10 2007-10-17 阿尔卡特朗讯 Control circuit for causing cyclic application of sealing current for local loops supporting data network telephony
US7991123B2 (en) 2004-11-10 2011-08-02 Alcatel Lucent Control circuit for causing cyclic application of sealing current for local loops supporting data network telephony
KR101222274B1 (en) * 2004-11-10 2013-01-15 알까뗄 루슨트 Control circuit for causing cyclic application of sealing current for local loops supporting data network telephony
EP1843566A1 (en) 2006-04-03 2007-10-10 Huawei Technologies Co., Ltd. Method and devices for providing wetting current
AU2007234199B2 (en) * 2006-04-03 2010-06-24 Huawei Technologies Co., Ltd. Method and devices for providing wetting current
US8275094B2 (en) 2006-04-03 2012-09-25 Huawei Technologies Co., Ltd. Method and devices for providing wetting current

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