CN1126352C - 通信线路端接检测 - Google Patents

通信线路端接检测 Download PDF

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CN1126352C
CN1126352C CN98118600A CN98118600A CN1126352C CN 1126352 C CN1126352 C CN 1126352C CN 98118600 A CN98118600 A CN 98118600A CN 98118600 A CN98118600 A CN 98118600A CN 1126352 C CN1126352 C CN 1126352C
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slic
line
connection
switch
lines
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CN1220539A (zh
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R·D·史密斯
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Marconi UK Intellectual Property Ltd
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Marconi Communications Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

从电话交换机到用户的一个2-线连接中，该连接经过一个用户线路接口电路(SLIC)和端接盒建立，端接盒有一个在连接的两线之间以及SLIC和用户之间的串联的电容和电阻。SLIC包括一个用于反转连接的两线极性的设备，还有一个测量设备，可以测量将电容改变为相对电极所需的电流，使得能够测量连接的两线之间的阻抗。

Description

通信线路端接检测
本发明涉及用于确定由2-线通信线路的两线之间的阻抗。
对测试2-线通信线路的阻抗的低花费设备的需求有所增长。这可以被用于确定线路泄漏或检测端接设备的存在(电话)。也可以检测诸如断路和短路等故障状态。
能够被使用的一种建议情况是综合业务数字网线路被端接，以提供一个ISDN连接和2-线模拟连接。
对于连接到2-线模拟端口的电话的检测被认为是，负载阻抗的实际部分是300Kohm或更少的地方。
从交换机到2-线连接的电路部件是一个用户线接口电路(SLIC)，它通常位于交换机或远端集线器侧。SLIC通常是一个集成电路，并且有一种线路反向功能。和断开2线连接之一的设备。在专利No.GB2093314B中描述了一个SLIC的例子。
专利No.GB2269073中描述了一种测试电话用户环路的方法，其中经过环路的支路提供电脉冲，并确定了由环路电流引起的瞬变电压的性质。可通过对环路电源的极性反向提供脉冲。可以经和环路串接的电阻被连接的差分放大器测量瞬变。典型地，测量最大电压，电压衰减到最大电压的某个特定比所需的时间和长期残留电压。这些测量值被返回到交换机，以识别环路中的故障状况。公开的内容要求连接支路中的串联电阻和进行切换的附加继电器。
根据本发明提供了一种用于确定由由一个用户线路接口电路(SLIC)到一个用户电路的2-线连接的两线之间的阻抗的装置，该装置包括一个由一个电话交换机到该用户电路的连接，该连接经由SLIC和端接盒而建立，端接盒有串联在连接的两线之间以及SLIC和端接盒之间的一个电容和一个电阻，而该端接盒位于该SLIC与该用户电路之间，SLIC包括一个用于断开2-线连接中一线的开关，进而依次还有一个和所述一线及SLIC供电干线相连接的开关，并且有一个电流监视点，从而可以监视电容放电所需的时间，使得能够确定该2-线连接的两线之间的阻抗。
下面将结合附图通过举例说明本发明，
图1显示的是根据本发明的一个实施例。
其中，图1示出了在交换机和用户10之间连接的一个SLIC1，和SLIC1和用户10之间的通过2-线连接的经由用户端接盒2的连接，该连接有连接支路A，B和与支路A，B之间的电阻6串联原电容5。
SLIC1包括一个开关断开两线连接之间的A-支路的开关，和用于监视A-支路放电电流的设备，进而ALIC1有一个开关SW1，它将断开A支路，通常开关SW1在SLIC支路中用于允许地呼叫/地键信号的检测。另外，在SLIC1中一个开关SW2被从支路A连接到负电压干线，该干线在连接中有一个电流监视位置3。
最初开关SW1是接通的而开前SW2是断开的，由SLCI1将电压提供在A，B之路之间。这对电容5和固有2W线电容充电。对于实际线路长度，线电容相对于电容5很小所以可以被忽略。
来自交换机的控制信号9被提供给SLIC1，使开关SW1断开而开关SW2接通，这样就可以监视从电容5经电阻6的放电，以及通过测量电流降低到预定值所用时间，或者测量预定时间之后的电流所确定的电路阻抗。
通过使用在断开开关SW1和接通开关SW2之前的SLCI1进行线路反向，电流值可以翻倍而使测量容易和简单。
以上结构的益处在于，消除了静态反馈电流效应并且无需校准，不需要附加继电器来提供开关，这在现有技术中是需要的。另外，所述装置不需要和电源串接的电阻和二极管，这些部件消耗电能并且减少了线路的可能长度。

Claims (2)

1.一种用于确定由由一个用户线路接口电路(SLIC)到一个用户电路的2-线连接的两线之间的阻抗的装置，该装置包括一个由一个电话交换机到该用户电路的连接，该连接经由SLIC和端接盒而建立，端接盒有串联在连接的两线之间以及SLIC和端接盒之间的一个电容和一个电阻，而该端接盒位于该SLIC与该用户电路之间，SLIC包括一个用于断开2-线连接中一线的开关，进而依次还有一个和所述一线及SLIC供电干线相连接的开关，并且有一个与该开关相串联的电流监视点，从而可以监视电容放电所需的时间，使得能够确定该2-线连接的两线之间的阻抗。
2.如权利要求1的装置，进一步包括通过从交换机提供给SLIC的控制信号，对两线连接的线之间极性进行反转的设备。
CN98118600A 1997-09-02 1998-09-02 通信线路端接检测 Expired - Fee Related CN1126352C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9718428.7A GB9718428D0 (en) 1997-09-02 1997-09-02 Telelcommunications line termination test
GB9718428.7 1997-09-02

Publications (2)

Publication Number Publication Date
CN1220539A CN1220539A (zh) 1999-06-23
CN1126352C true CN1126352C (zh) 2003-10-29

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US (1) US6169784B1 (zh)
EP (1) EP0901264B1 (zh)
CN (1) CN1126352C (zh)
AU (1) AU8306798A (zh)
DE (1) DE69832671T2 (zh)
GB (1) GB9718428D0 (zh)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
DE10051383C1 (de) * 2000-10-17 2002-04-04 Infineon Technologies Ag Verfahren zur Messung einer Lastimpedanz
US6522249B1 (en) * 2001-08-30 2003-02-18 United Electric Controls, Co. Two wire output/power mechanism for remote devices
DE50108493D1 (de) * 2001-11-16 2006-01-26 Swisscom Fixnet Ag Bern Verfahren und system zum klassifizieren von netzwerkverbindungen
US6983038B2 (en) * 2002-10-29 2006-01-03 Bellsouth Intellectual Property Corporation Maintenance termination unit
DE102004014449B4 (de) * 2004-03-24 2006-02-09 Infineon Technologies Ag Verfahren zur Widerstandsmessung für eine Teilnehmeranschlussschaltung mittels einer Schutzschaltung
DE102005046383B4 (de) * 2005-09-28 2007-10-25 Siemens Ag Verfahren und Einrichtung zur Überprüfung der Funktion zur Invertierung der Polarität auf einer mehrere Adern umfassenden Teilnehmeranschlussleitung
CN101064751B (zh) * 2006-04-28 2011-06-08 鸿富锦精密工业（深圳）有限公司 U接口回路极性自动反转系统及方法
TWI309117B (en) * 2006-05-19 2009-04-21 Hon Hai Prec Ind Co Ltd Internet telephony gateway and method for detecting connection error thereof
US9842628B2 (en) * 2008-07-10 2017-12-12 Agiga Tech Inc. Capacitor enablement voltage level adjustment method and apparatus

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FR2504274A1 (fr) * 1981-04-17 1982-10-22 Poitevin Jean Pierre Dispositif de localisation de defauts dans une ligne bifilaire
US4373121A (en) 1981-06-15 1983-02-08 Bell Telephone Laboratories, Incorporated Maintenance termination device
EP0303142B1 (de) * 1987-08-07 1993-12-15 Siemens Aktiengesellschaft Verfahren zur Messung von Leitungsparametern von Teilnehmeranschlussleitungen eines Fernmeldenetzes
GB2269073B (en) * 1992-07-23 1996-06-19 Northern Telecom Ltd Remote line tester
US6084946A (en) * 1998-11-30 2000-07-04 Bell Atlantic Network Services, Inc. Qualifying a telephone line for digital transmission service

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DE69832671D1 (de) 2006-01-12
EP0901264A2 (en) 1999-03-10
GB9718428D0 (en) 1997-11-05
AU8306798A (en) 1999-03-18
EP0901264B1 (en) 2005-12-07
CN1220539A (zh) 1999-06-23
US6169784B1 (en) 2001-01-02
DE69832671T2 (de) 2006-07-13
EP0901264A3 (en) 2003-11-26

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