WO2002058406A1 - Blindage et gestion de la compatibilite electromagnetique dans les systemes de communication - Google Patents

Blindage et gestion de la compatibilite electromagnetique dans les systemes de communication Download PDF

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Publication number
WO2002058406A1
WO2002058406A1 PCT/SE2002/000061 SE0200061W WO02058406A1 WO 2002058406 A1 WO2002058406 A1 WO 2002058406A1 SE 0200061 W SE0200061 W SE 0200061W WO 02058406 A1 WO02058406 A1 WO 02058406A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication related
cables
shielding casing
conductive plate
electrically conductive
Prior art date
Application number
PCT/SE2002/000061
Other languages
English (en)
Other versions
WO2002058406A8 (fr
Inventor
Niklas RAMSTRÖM
Lan Gao
Aleksander Tempel
Åke ERICSSON
Original Assignee
Telefonaktiebolaget Lm Ericsson
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 Telefonaktiebolaget Lm Ericsson filed Critical Telefonaktiebolaget Lm Ericsson
Publication of WO2002058406A1 publication Critical patent/WO2002058406A1/fr
Publication of WO2002058406A8 publication Critical patent/WO2002058406A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/65912—Specific features or arrangements of connection of shield to conductive members for shielded multiconductor cable
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/10—Exchange station construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/11—Protection against environment
    • H04Q1/116—Protection against environment lightning or EMI protection, e.g. shielding or grounding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/14—Distribution frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2201/00—Constructional details of selecting arrangements
    • H04Q2201/14—Screening, grounding or crosstalk reduction details

Definitions

  • the present invention generally relates to the field of communications, and more specifically to a digital distribution frame device for interconnecting two shielded communication related systems, to a communication system comprising two interconnected shielded communication related systems, and to a method for interconnecting two shielded communication related systems .
  • Communication systems such as e.g. exchange and transmission systems, can be directly connected to one another.
  • electrical signals are transferred among the systems via digital distribution frame devices (hereinafter referred to as DDF devices) .
  • DDF devices digital distribution frame devices
  • the DDF device is used for the following reasons. In cases where systems or apparatuses from different manufacturers are used, connectors for wiring, terminals, and types of cables used often differ from manufacturer to manufacturer, requiring interfacing points for resolving the differences. Also, when systems or apparatuses are installed at different times, interfacing points that permit the wiring to be switched for the individual apparatuses are required in order to enhance the efficiency of the installation work. Further, since rewiring after installation consumes a great deal of man-hours and cost, interfacing points that facilitate rewiring are needed. To meet the requirements, the DDF device provides a line switching function by means of cross-connection lines and, optionally, a signal monitoring function, and thus is indispensable to the communication systems. In a typical DDF device, connections of signal lines are performed at the rear, whereas cross-connection, signal monitoring during on-site adjustment and maintenance are conducted at the front side.
  • the grounded shields of the two systems may be directly connected to each other.
  • the systems may come from different manufacturers and be located at different places remote from each other, and in such cases the two separated systems may be on separated grounding systems of different ground potential and accordingly, a current (DC or 50/60 Hz) will be driven in the interconnected grounding systems. This may cause not only operational upsets but also in the worse case permanent damages because of overheating of signal cables.
  • a telecommunication exchange system such as an Ericsson AXE exchange system
  • CBN common bonding network
  • MET main earth terminal
  • the common bonding network of such an exchange system also is the positive polarity of the -48 VDC power for the exchange system, the current driven between the two grounding systems may affect the power quality and consequently introduce disturbances to the signals.
  • the main object of the present invention is to provide a DDF device for interconnecting a first and a second communication related systems such as an exchange system and a transmission system, with the function of preventing current (DC and optionally 50/60 Hz AC current) flowing in the grounding system through the cable shields, if the two communication systems are installed in separated grounding systems .
  • interconnections comprises a plurality of input/output cables, each cable including at least one signal conductor and a surrounding grounded shield, it is a particular object of the invention to provide such DDF device without the need to provide a large number of capacitors and having each of them connected in a respective one of the grounded shields of the plurality of cables.
  • DDF device which is flexible and which allows for fast and simple interconnection of the grounded cable shields of the respective communication related systems and to have the shields either connected or disconnected depending on whether the first and the second communication related systems are installed with a common grounding system or with separated grounding systems. It is yet a further object of the invention to provide such device, which is reliable, simple, of low cost and compact in size.
  • a DDF device which comprises a shielding casing of a conducting material and a plurality of cross-connectors located within the shielding casing for electrically interconnecting the signal conductor (s) of each of the cables of the first communication related system and the signal conductor (s) of each of the cables of the second communication related system to thereby enable signals to be transferred between the first and second communication related systems.
  • the DDF device further comprises first shield connectors in electrical connection with the shielding casing for electrically connecting the surrounding grounded shield of each of the cables of the first communication related system to the shielding casing; and an electrically conductive plate arranged at a distance from the shielding casing and electrically insulated from the shielding casing.
  • the plate includes a plurality of second shield connectors for electrically connecting the surrounding grounded shield of each of the cables of the second communication related system to the plate to thereby prevent any DC current from flowing between the grounded shields of the respective communication related system.
  • the DDF device may be equipped with an electrical connection between the shielding casing and the electrically conductive plate, which connection is switchable between a disconnected state, in which the shielding casing and the electrically conductive plate are electrically disconnected, and a connected state, in which the shielding casing and the electrically conductive plate are electrically connected, in dependence on the difference of the ground potentials of the first and second communication related systems .
  • the DDF device may include a gas discharge tube connected between the shielding casing and the electrically conductive plate.
  • the DDF device is arranged such that the signal conductor (s) of each of the cables of the second communication related system is unshielded at a portion only, which is insufficient to affect the shielding effect at frequencies lower than a predetermined frequency, e.g. 1 GHz.
  • a predetermined frequency e.g. 1 GHz.
  • a further object of the present invention is to provide a communication system comprising a first and a second communication related system as defined above, which are interconnected by a DDF device and wherein any DC current is prevented from flowing between the grounded shields of the respective communication related system.
  • a communication system comprising a first and a second shielded communication related system, each of the systems being either an exchange system or a transmission system and each comprising a plurality of input/output cables, where each cable includes at least one signal conductor and a surrounding grounded shield, the communication system further comprising a DDF device according to the first aspect of the invention connected between the first and second shielded communication related systems.
  • a further object of the present invention is to provide a method for interconnecting a first and a second shielded communication related system, where each of the systems is either an exchange system or a transmission system and each comprises a plurality of input/output cables, where each cable including at least one signal conductor and a surrounding grounded shield, which is flexible, fast, simple, inexpensive and reliable.
  • An advantage of the present invention is that a very flexible interconnection of the grounding systems of the two communication related systems is obtained.
  • Fig. 1 illustrates, in a schematic top view, a DDF device according to a general embodiment of the present invention, said device being mounted in a termination cabinet.
  • Fig. 2 illustrates, in a schematic perspective view as seen from the rear side, a DDF device according to a particular embodiment of the present invention.
  • FIG. 1 illustrates, in a schematic top view, a DDF device or sub-rack for the interconnection of two shielded communication related systems, a general embodiment of the present invention will be described.
  • the DDF device denoted by 1 in Fig. 1, comprises a shielding casing or box 3 of a conductive material having a rear cover 5, a front cover 7, two side covers 9, 11 and top and bottom covers (not illustrated in Fig. 1) .
  • the interior of casing 3 comprises a plurality of terminal blocks, of which only two 13, 15 are shown in Fig. 1, and a plurality of cross-connection lines releasably connectable between the blocks, of which lines also only two 17, 19 are illustrated in Fig. 1.
  • the front cover 7 of casing 3 is a fold-down cover that folds down to give ease access to the plurality of terminal blocks.
  • the DDF device 1 is preferably mounted in a rack or system cabinet, such as e.g. the Ericsson BYB 501 termination cabinet, of which portions of a rear cover 21 is illustrated in Fig. 1.
  • the DDF device is a sub-rack hinged at 23 such that it is pivotable for ease access also to the rear of the device.
  • the rear of DDF device 1 includes a plurality of openings operating as shield connectors and signal conduit passages, which will be described in close detail. First, however, the communication related systems to be interconnected by DDF device 1 and their respective interfaces will be described briefly.
  • the shielded communication related systems may each be any of an exchange or a transmission system, but in the following a first communication related system will be referred to as an exchange system and a second communication related system will be referred to as a transmission system.
  • the input/output interface of the exchange system is a plurality of shielded cables, of which only one 25 is shown in Fig. 1.
  • Each such cable 25 includes, in the illustrated case, a 2-pair wire 27 for signal transfer and a grounded shield conductor (not explicitly distinguishable in Fig. 1) surrounding 2-pair wire 27.
  • Each of the grounded shield conductors is electrically connected to the grounding system of the exchange system.
  • Such grounding system may as well be the positive polarity of a negative DC voltage for the exchange system.
  • the transmission system interface includes a plurality of shielded cables, of which only one 29 is shown in Fig. 1.
  • Each such cable 29 includes, in the illustrated case, a 2-pair wire 31 for signal transfer and a grounded shield conductor (not explicitly distinguishable in Fig. 1) surrounding 2-pair wire 31.
  • Each of the grounded shield conductors of the transmission interface is electrically connected to the grounding system of the transmission system.
  • each individual signal conductor as well as each grounded shield conductor of the communication related systems are covered by a respective insulator (neither explicitly distinguishable in Fig. 1) .
  • the present invention is applicable for other kind of cable such as e.g. 8-pair cable, 16-pair cable and coaxial cable.
  • cover 5 includes a plurality of paired openings, of which only one is illustrated in Fig. 1, each pair being referred to as a shield connector for electrical connection of a respective one of the grounded shield conductors of the exchange system to the shielding casing 3 and for allowing the respective 2-paired wire 27, which is surrounded by the grounded shield conductor, to pass through the cover to the terminal blocks in the interior of the DDF device 1.
  • the 2-paired wire 27 is connected to terminal block 13.
  • each of the cables 25 of the system is provided with a respective cable clamp 33, which is crimped around, and thus electrically connected to, the shield conductor of that cable.
  • Each cable clamp 33 is introduced into a first opening of a respective pair, while the other opening receives a screw, bolt or similar 35 for fastening the respective cable clamp, and thus cable, to the casing 3.
  • rear cover 5 includes a plurality of individual openings, of which only one is illustrated in Fig. 1, for allowing each of the 2-paired wires 31, which is surrounded by a respective grounded shield conductor, to pass through the cover to the terminal blocks in the interior of the DDF device 1.
  • the 2-paired wire 31 is connected to terminal block 15.
  • the signal conductors of each of the plurality of cables of the exchange system and the signal conductors of each of the plurality of cables of the transmission system can be selectively connected to enable signals to be transferred between the exchange and transmission systems.
  • DDF device 1 further comprises an electrically conductive plate 37 arranged at a distance D from shielding casing 3 by means of dielectric distances 39 such that plate 37 is electrically insulated from shielding casing 3.
  • the electrically conductive plate 37 and the rear cover 5 of the casing 3 are substantially planar and are arranged in parallel with each other separated by the distance D.
  • the electrically conductive plate 37 includes a plurality of paired openings, of which only one is illustrated in Fig. 1, each pair being referred to as a shield connector for electrical connection of a respective one of the grounded shield conductors of the transmission system to the plate 37 and for allowing the respective 2-paired wire 31, which is surrounded by the grounded shield conductor, to pass through plate 37.
  • Each of the pair of openings in the plate 37 is preferably aligned with a respective one of the individual openings in rear cover 5 of casing 3; thus the respective 2-paired wire 31 can be introduced into the casing 3.
  • each of the cables 29 of the system is provided with a respective cable clamp 41, which is crimped around, and thus electrically connected to, the shield conductor of that cable.
  • Each cable clamp 41 is introduced into a first opening of a respective pair, while the other opening receives a screw, bolt or similar 43 for fastening the respective cable clamp, and thus cable, to the casing 3.
  • the conductive plate 37 may be provided with opening (s) for the plurality of cables of the exchange system as indicated in the Figure. Alternatively, the plate 37 only covers a portion of the rear cover 5 where the transmission equipment cables are to be installed.
  • the grounding systems of the respective shielded communication related system i.e. the exchange and the transmission system
  • DC current possibly also low frequency AC current
  • the DDF device 1 is reliable, simple, of low cost and compact in size.
  • the DC-barrier function is to be applied only when needed, i.e. when the two systems are installed with separated grounding systems.
  • DDF connection complies with EMC, i.e. that the DDF device will neither cause electromagnetic disturbances, nor itself be affected by other equipment.
  • EMC electrospray Detection Counter
  • the distance d between the front of the respective cable cramp 41 and the shielding casing 3, the distance D between the electrically conductive plate 37 and the shielding casing 3, or more generally, any other appropriate dimension of unshielded signal conductors is preferably adjusted in dependence on the frequency range, e.g., 0 - 1 GHz, of the shielding desired.
  • such frequency range may correspond to an unshielded portion of the signal conductor (s) of each of the plurality of cables of the transmission system of a dimension of less than 20 mm, preferably less than 15 mm, more preferably less than 12 mm, and most preferably 1-5 mm.
  • the DDF device is arranged such that the signal conductor (s) of each of the plurality of cables of the transmission system is unshielded at a portion only, which is insufficient to affect the shielding effect at frequencies lower than a predetermined frequency.
  • a predetermined frequency may be set by requirements set by the manufacturer or owner, e.g. service provider, of any of the communication systems, or it may be set by standards or regulations.
  • FIG. 2 illustrates, in a schematic perspective view, a as seen from the rear side, a particular embodiment design of the present invention will briefly be overviewed.
  • the DDF device 1 comprises the shielding casing 3 including rear cover 5 and front cover 7. Note that front cover 7 is shown folded down, whereby access to the interior of the device, i.e. the cross-connectors, is enabled. Further, electrically conductive plate is arranged at the upper half only of the rear cover, the plate 37 being separated from the rear cover 5 by means of dielectric distances 39.
  • the rear cover includes a plurality of paired through holes 51, 53 constituting shield connectors for electrically connecting the grounded shield of each of the plurality of cables of the exchange system to shielding casing 3 and passages for the signal conductor (s) of each of the plurality of cables of the exchange system.
  • the electrically conductive plate 37 includes a plurality of paired through holes 55, 57 constituting shield connectors for electrically connecting the grounded shield of each of the plurality of cables of the transmission equipment to plate 37 and passages for the signal conductor (s) of each of the plurality of cables of the transmission equipment.
  • a respective individual through hole 59 formed in the rear cover, the purpose of which being to allow the signal conductor (s) of each of the plurality of cables of the transmission equipment to pass through.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Cable Accessories (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

La présente invention concerne un dispositif de châssis de distribution numérique (DDF, Digital Distribution Frame) qui est destiné à relier un premier et un second dispositif de communication blindé, chacun de ces dispositifs comprenant une pluralité de câbles d'entrée/sortie (25, 29), chacun des câbles comprenant au moins un conducteur de signal (27, 31) et étant entouré d'un blindage de protection relié à la terre. Le dispositif DDF de l'invention comprend une enveloppe de protection (3) dans une matière conductrice et des raccordements croisés (17,19) placés à l'intérieur de l'enveloppe de protection, qui permettent de relier entre eux les conducteurs de signaux de chacun des câbles du premier et du second système de communication afin de permettre le transfert des signaux entre les systèmes. Le dispositif DDF précité comprend en outre de premiers connecteurs de blindage (51, 53) qui permettent de relier au boîtier le blindage relié à la terre entourant chacun des câbles du premier système ; et une plaque conductrice (37) agencée à une certaine distance (D) et isolée du boîtier de blindage, qui comprend de seconds connecteurs de blindage (55, 57) permettant de relier le blindage relié à la terre entourant chacun des câbles du second système à la plaque afin d'empêcher un quelconque courant continu de circuler entre les blindages reliés à la terre des systèmes respectifs.
PCT/SE2002/000061 2001-01-19 2002-01-15 Blindage et gestion de la compatibilite electromagnetique dans les systemes de communication WO2002058406A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0100156-9 2001-01-19
SE0100156A SE0100156L (sv) 2001-01-19 2001-01-19 Avskärmning samt hantering av EMC i kommunikationssystem

Publications (2)

Publication Number Publication Date
WO2002058406A1 true WO2002058406A1 (fr) 2002-07-25
WO2002058406A8 WO2002058406A8 (fr) 2004-05-27

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ID=20282670

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/000061 WO2002058406A1 (fr) 2001-01-19 2002-01-15 Blindage et gestion de la compatibilite electromagnetique dans les systemes de communication

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WO (1) WO2002058406A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808116A (en) * 1984-03-21 1989-02-28 Reliance Comm/Tec Corporation Telephone distribution frame connector assembly
EP0485245A2 (fr) * 1990-11-05 1992-05-13 Adc Telecommunications, Inc. Module pour répartiteur des signaux numériques
US5861783A (en) * 1997-08-01 1999-01-19 Lucent Technologies Inc. Crosstalk reduction in parasitically coupled circuits with an RC network connecting circuit grounds

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808116A (en) * 1984-03-21 1989-02-28 Reliance Comm/Tec Corporation Telephone distribution frame connector assembly
EP0485245A2 (fr) * 1990-11-05 1992-05-13 Adc Telecommunications, Inc. Module pour répartiteur des signaux numériques
US5861783A (en) * 1997-08-01 1999-01-19 Lucent Technologies Inc. Crosstalk reduction in parasitically coupled circuits with an RC network connecting circuit grounds

Also Published As

Publication number Publication date
SE0100156L (sv) 2002-07-20
WO2002058406A8 (fr) 2004-05-27
SE0100156D0 (sv) 2001-01-19

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