EP1197010A1 - Module for connection and testing of high frequency transmission lines - Google Patents
Module for connection and testing of high frequency transmission linesInfo
- Publication number
- EP1197010A1 EP1197010A1 EP00948123A EP00948123A EP1197010A1 EP 1197010 A1 EP1197010 A1 EP 1197010A1 EP 00948123 A EP00948123 A EP 00948123A EP 00948123 A EP00948123 A EP 00948123A EP 1197010 A1 EP1197010 A1 EP 1197010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- module
- shield
- connection
- module according
- testing
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13003—Constructional details of switching devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13039—Asymmetrical two-way transmission, e.g. ADSL, HDSL
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13092—Scanning of subscriber lines, monitoring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/1316—Service observation, testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13298—Local loop systems, access network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13306—Ferro-electric elements
Definitions
- This invention relates to a module for connection and testing of transmission lines at high frequencies" , that is frequencies of approximately 100 megahertz and higher.
- Attenuation which consists of loss of power of the signal, in a manner which is directly proportional to the distance of transmission and the frequency. This attenuation is measured as decibels lost per 100 m (dB/lOOm).
- b) The diaphony of "next" (cross-talk) which occurs when the signal of a transmission line pair is filtered or connected to another adjacent pair and takes the form of noise.
- the generation of cross-talk noise increases with increasing frequency, but the transmission of this cross-talk noise along the adjacent pair is also subject to attenuation, measured as dB/lOOm, which attenuation also increases with the frequency.
- dB/lOOm which attenuation also increases with the frequency.
- the purpose of the present invention is to provide a module for connection and testing of transmission lines, which can operate at high frequencies of at least 100 MHz, and which complies with the values attributed to attenuation and diaphony in the standards which correspond to Category 5.
- the main concept for functional effectiveness of this module consists of separation of adjacent modules in line connection boxes by incorporation of earthed metal shields on one side of each module. Consequently, the design includes the means for establishing electrical continuity between the protective shield and the earthing electrode, which is obtained by means of a configuration in a single piece, suitably shaped by stamping (cutting and folding) of the metal shield and the earthing terminal.
- Figure 1 is a perspective view of the shielded module, seen from the side protected by the metal shield;
- Figure 2 is a perspective view of the single piece formed by the metal shield and the earthing terminal.
- the module (3) is of the aforementioned type described in EP-B-0711012 having connection means for forming connections to the line conductors, cut-off means comprising an extractable electrical continuity part of the module, and circuit- protection means connected to an earthing terminal (preferably by connection to the latter of a protective terminal which surrounds it) for protection against excess voltages.
- the circuit protection means preferably comprises an ionised noble gas discharger.
- the circuit protection means is joined to, preferably carried by, the extractable continuity part of the module.
- Each module (3) includes a flat metal screen (1) which is earthed, and at least partly covers one of the sides of the module, such as to create a barrier against inductive effects between each two adjacent modules in a connection box.
- Electrical continuity between the protective shield and the earthing electrode is established by making the metal shield (1) and the earthing terminal (2) as a single piece, for example by stamping and bending of sheet metal.
- the earthing terminal (2) is inserted (preferably potted) into the body of the module, as known per se from existing modules, to make contact in use with the central earthing electrode (not shown) of the extractable continuity part, shown in these drawings with an upwardly projecting knob or handle for convenient manual disconnection of the circuits.
- metal conductors connect the wires to be inserted in the twin apertures at either end of the module to the bridging conductors (not shown) in the continuity part, which also holds a circuit protection gas discharge tube (not shown) connected between the bridging conductors and the central earthing electrode.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Structure Of Telephone Exchanges (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Multi-Conductor Connections (AREA)
Abstract
Module (3) for connection and testing of high frequency transmission lines, characterised in that the module (3) includes an earthed electrically conductive (preferably metal) shield (1), which covers one side of the module sufficiently to act as a barrier against inductive effects between two or more such modules when arranged adjacent to each other (for example in an array of such modules in a connection box) with the shield between them.
Description
MODULE FOR CONNECTION AND TESTING OF HIGH FREQUENCY
TRANSMISSION LINES
This invention relates to a module for connection and testing of transmission lines at high frequencies" , that is frequencies of approximately 100 megahertz and higher.
The increasing use of telephone lines for transmission of data makes it necessary to operate with increasingly high frequencies, in order to obtain wider band widths. However, not all of the components originally designed for telephone service can provide an acceptable data service with performance levels required by the high frequency transmissions. In fact, when operating at high frequencies, there is accentuation of any disturbances in the transmission and reductions in the signal strength, generally in direct proportion to the increasing frequency.
These undesirable frequency effects include: a) Attenuation, which consists of loss of power of the signal, in a manner which is directly proportional to the distance of transmission and the frequency. This attenuation is measured as decibels lost per 100 m (dB/lOOm). b) The diaphony of "next" (cross-talk) which occurs when the signal of a transmission line pair is filtered or connected to another adjacent pair and takes the form of noise. The generation of cross-talk noise increases with increasing frequency, but the transmission of this cross-talk noise along the adjacent pair is also subject to attenuation, measured as dB/lOOm, which attenuation also increases with the frequency. Thus, there is a complex relationship between generation and attenuation of cross-talk noise with increasing frequency. In a voice line, diaphony (cross-talk) is inconvenient, but in a data transmission line it is seriously disruptive, making the content and interpretation of the signal unreliable. Consequently it is desirable to reduce its presence and effect to a minimum.
International standards have been established which make it possible to classify electrical components in categories according to their performance against standardised values of attenuation and cross-talk at difference frequencies, and Category 5 is obtained if there is compliance with the standards at frequencies of up to 100 Mhz. Known modules
for connection and testing of telephone lines, for example as described in EP-B-0711012, do not comply with the standards in question at such frequencies, and consequently, it is impossible on these lines to obtain the Category 5 rating required at present for the components of many transmission networks.
The purpose of the present invention is to provide a module for connection and testing of transmission lines, which can operate at high frequencies of at least 100 MHz, and which complies with the values attributed to attenuation and diaphony in the standards which correspond to Category 5.
The main concept for functional effectiveness of this module consists of separation of adjacent modules in line connection boxes by incorporation of earthed metal shields on one side of each module. Consequently, the design includes the means for establishing electrical continuity between the protective shield and the earthing electrode, which is obtained by means of a configuration in a single piece, suitably shaped by stamping (cutting and folding) of the metal shield and the earthing terminal.
The effectiveness of the solution described has been analysed in a laboratory, and it has been proved that the shielded module complies with all the technical requirements necessary for its classification in Category 5, i.e. with operation at frequencies of at least 100 MHz.
In order to further illustrate the invention, drawings of a specific embodiment are attached by way of example, which represent schematically different aspects of the shielded module. In these drawings:
Figure 1 is a perspective view of the shielded module, seen from the side protected by the metal shield; and
Figure 2 is a perspective view of the single piece formed by the metal shield and the earthing terminal.
Referring to the drawings, the module (3) is of the aforementioned type described in EP-B-0711012 having connection means for forming connections to the line conductors,
cut-off means comprising an extractable electrical continuity part of the module, and circuit- protection means connected to an earthing terminal (preferably by connection to the latter of a protective terminal which surrounds it) for protection against excess voltages. The circuit protection means preferably comprises an ionised noble gas discharger. In preferred constructions, the circuit protection means is joined to, preferably carried by, the extractable continuity part of the module.
Each module (3) includes a flat metal screen (1) which is earthed, and at least partly covers one of the sides of the module, such as to create a barrier against inductive effects between each two adjacent modules in a connection box. Electrical continuity between the protective shield and the earthing electrode is established by making the metal shield (1) and the earthing terminal (2) as a single piece, for example by stamping and bending of sheet metal. The earthing terminal (2) is inserted (preferably potted) into the body of the module, as known per se from existing modules, to make contact in use with the central earthing electrode (not shown) of the extractable continuity part, shown in these drawings with an upwardly projecting knob or handle for convenient manual disconnection of the circuits. Also as known per se, metal conductors (not shown) connect the wires to be inserted in the twin apertures at either end of the module to the bridging conductors (not shown) in the continuity part, which also holds a circuit protection gas discharge tube (not shown) connected between the bridging conductors and the central earthing electrode.
Claims
1. Module (3) for connection and testing of high frequency transmission lines, characterised in that the module (3) includes an earthed electrically conductive (preferably metal) shield (1), which covers one side of the module sufficiently to act as a barrier against inductive effects between two or more such modules when arranged adjacent to each other (for example in an array of such modules in a connection box) with the shield between them.
2. Module according to Claim 1, characterised in that electrical continuity between the protective shield (1) and an earthing electrode (2) is established by forming them integrally, preferably as a single piece of metal.
3. Module according to claim 2, characterised in that the shield is secured to the module at least partly by insertion and retention (preferably by potting) of the earthing electrode in the body of the module and/or at least partly by gripping of part of the module between the shield and the earthing electrode.
4. Module according to any preceding claim, wherein the said shield is substantially flat.
5. Module according to any preceding claim, being of the type (known per se) having connection means for forming connections to the line conductors, cut-off means comprising an extractable electrical continuity part of the module, and circuit-protection means connected to an earthing terminal (preferably by connection to the latter of a protective terminal which surrounds it) for protection against excess voltages.
6. Module according to claim 5, wherein the circuit protection means comprises an ionised noble gas discharger.
7. Module according to claim 5 or 6, wherein the circuit protection means is joined to, preferably carried by, the extractable continuity part of the module.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES009901946U ES1043862Y (en) | 1999-07-21 | 1999-07-21 | DISPLAYED MODULE FOR CONNECTION AND TESTING OF TRANSMISSION LINES AT HIGH FREQUENCIES. |
ES9901946 | 1999-07-21 | ||
PCT/GB2000/002702 WO2001006675A1 (en) | 1999-07-21 | 2000-07-14 | Module for connection and testing of high frequency transmission lines |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1197010A1 true EP1197010A1 (en) | 2002-04-17 |
Family
ID=8309780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00948123A Withdrawn EP1197010A1 (en) | 1999-07-21 | 2000-07-14 | Module for connection and testing of high frequency transmission lines |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1197010A1 (en) |
AR (1) | AR024889A1 (en) |
BR (1) | BR0012682A (en) |
ES (1) | ES1043862Y (en) |
MX (1) | MXPA02000690A (en) |
PE (1) | PE20010181A1 (en) |
WO (1) | WO2001006675A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7513797B2 (en) | 2004-02-27 | 2009-04-07 | 3M Innovative Properties Company | Connector apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0711912B1 (en) * | 1994-11-10 | 2000-03-22 | Regie Nationale Des Usines Renault S.A. | Method to control the fuel supply of internal combustion engines |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4800463A (en) * | 1985-12-05 | 1989-01-24 | Tandem Computers Incorporated | Circuit board barrier guide |
JPH09180085A (en) * | 1995-12-21 | 1997-07-11 | Kokusai Electric Co Ltd | Testing/measuring instrument |
-
1999
- 1999-07-21 ES ES009901946U patent/ES1043862Y/en not_active Expired - Fee Related
-
2000
- 2000-07-14 BR BR0012682-9A patent/BR0012682A/en not_active IP Right Cessation
- 2000-07-14 WO PCT/GB2000/002702 patent/WO2001006675A1/en not_active Application Discontinuation
- 2000-07-14 EP EP00948123A patent/EP1197010A1/en not_active Withdrawn
- 2000-07-14 MX MXPA02000690A patent/MXPA02000690A/en unknown
- 2000-07-18 PE PE2000000713A patent/PE20010181A1/en not_active Application Discontinuation
- 2000-07-21 AR ARP000103752A patent/AR024889A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0711912B1 (en) * | 1994-11-10 | 2000-03-22 | Regie Nationale Des Usines Renault S.A. | Method to control the fuel supply of internal combustion engines |
Non-Patent Citations (1)
Title |
---|
See also references of WO0106675A1 * |
Also Published As
Publication number | Publication date |
---|---|
PE20010181A1 (en) | 2001-02-22 |
ES1043862U (en) | 2000-01-16 |
ES1043862Y (en) | 2000-07-01 |
WO2001006675A1 (en) | 2001-01-25 |
AR024889A1 (en) | 2002-10-30 |
BR0012682A (en) | 2002-04-16 |
MXPA02000690A (en) | 2003-07-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20011221 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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17Q | First examination report despatched |
Effective date: 20030210 |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20040917 |