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WO1999034591A1 - Procede pour raccorder un appareil peripherique alimente a distance - Google Patents

Procede pour raccorder un appareil peripherique alimente a distance Download PDF

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Publication number
WO1999034591A1
WO1999034591A1 PCT/AT1998/000317 AT9800317W WO9934591A1 WO 1999034591 A1 WO1999034591 A1 WO 1999034591A1 AT 9800317 W AT9800317 W AT 9800317W WO 9934591 A1 WO9934591 A1 WO 9934591A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission line
voltage
unit
peripheral device
circuit arrangement
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.)
Ceased
Application number
PCT/AT1998/000317
Other languages
German (de)
English (en)
Inventor
Franz Haselsteiner
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.)
Ericsson Austria GmbH
Original Assignee
Ericsson Austria GmbH
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 Ericsson Austria GmbH filed Critical Ericsson Austria GmbH
Priority to EP98960857A priority Critical patent/EP1042908A1/fr
Priority to IL13683798A priority patent/IL136837A/en
Priority to SI9820087A priority patent/SI20296A/sl
Priority to AU16466/99A priority patent/AU1646699A/en
Priority to HU0100695A priority patent/HUP0100695A3/hu
Publication of WO1999034591A1 publication Critical patent/WO1999034591A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations

Definitions

  • the invention relates to a method for connecting a peripheral device fed from a central location via a transmission line
  • Message transmission system wherein in a first step the peripheral device is connected to the transmission line when the remote supply voltage is switched off.
  • Remote power supplies from various telecommunications device devices are widely used in many telephone systems, for example in pair gain systems.
  • a central location e.g. a local exchange
  • a DC voltage source is available, which provides the required operating current for the device connected to the peripheral ends of the transmission line.
  • the main task of the transmission line is to transmit signals or data in the low-voltage range. For this reason, no facilities serving to protect people are usually provided for such transmission lines. Tensions that are dangerous for the human body are therefore not used even with conventional remote power supplies.
  • the usual supply voltages are 48V or 60V, with fluctuations of up to 20% being tolerated.
  • the development of recent years shows a clear tendency in the direction of ever higher device outputs, which cause very high currents and thus power losses when the supply voltage limits are maintained.
  • connection work can be carried out when the remote power supply is switched off.
  • the remote power supply is switched off.
  • it must be prevented with certainty that a dangerously high remote supply voltage can occur on the transmission line during the assembly time. It must therefore be ensured that the operating supply voltage cannot occur if the peripheral device is not connected or is incorrectly connected.
  • attempts have already been made, after applying a voltage, to determine via a current measurement of the current flowing in the transmission line whether the device in question is actually connected or whether there are open peripheral ends of the transmission line.
  • Another way of avoiding these obstacles is to provide a defined resistance in the peripheral device which can be switched off during operation and which can be used to check the connection status of the peripheral device when the voltage is safe from a safety point of view.
  • the disadvantage of this solution is that a separate circuit in the remotely powered device is required, which has to monitor the provision of the measuring resistor and a later disconnection.
  • the measuring resistor would have to be designed to have a relatively low resistance in order to distinguish such a measurement from the measured values caused by cable leakage currents.
  • cable errors can easily lead to incorrect results.
  • the object of the invention is therefore to provide a method of the type mentioned at the beginning, with the aid of which personal protection is made possible during the assembly of remote-powered devices and an exact determination and differentiation of .connection states of a peripheral device is possible.
  • this is achieved in that, in a second step, a test voltage, which is less than the remote supply voltage of the device intended for operation, is applied to the central ends of the transmission line and the connection state of the peripheral ends of the transmission line by measuring the central side of the transmission line flowing amount of charge is determined, and that in a third step when determining the correct connection state of the transmission line, the remote supply voltage is increased to the operating supply voltage.
  • the assembly can be carried out in a voltage-free state and a risk to the assembly personnel from high voltages can be excluded.
  • the input capacities in the peripheral devices which differ significantly from the line capacities, can be used to detect the correct connection status by measuring the amount of charge flowing into the transmission line when the test voltage is applied.
  • test voltage is applied in a continuously repeating sequence and that into the
  • the amount of charge flowing through the transmission line is determined until the correct one
  • the time intervals between the individual measuring processes are preferably selected periodically, but it can also be switched to manual control of the if necessary
  • Time intervals may be provided so as to influence the
  • Test personnel can thus switch the measuring process on and off at will.
  • Test voltage to the peripheral device flowing current is measured.
  • the amount of charge flowing into the transmission line can be measured indirectly via the current, as a result of which interference signals on the transmission line which have a negative influence and which could occur in the case of direct charge measurement cannot have an effect on the measurement result.
  • the invention further relates to a circuit arrangement for implementing the method according to the invention, with which the connection state of a peripheral device can be determined precisely and reliably.
  • the unit for determining the amount of charge by a unit for generating a voltage proportional to the current flowing to the peripheral device and by a unit connected to this unit
  • Integrator unit is formed.
  • a simple implementation according to the invention can consist in that the unit for
  • Reference voltage source is connected, via which the threshold for changing the
  • Comparator output is adjustable.
  • the integrator consists of an inverting operational amplifier with an integrating capacitor in the
  • FigJ is a block diagram of a remotely powered communication system with a central location, a transmission line and a peripheral device;
  • FIG. 5 shows a circuit diagram of an embodiment of the circuit arrangement according to the invention.
  • a procedural method for connecting a device remotely powered from a central point via a transmission line is proposed in a communication system, the first step being peripheral device 2 is connected to the transmission line 1 when the remote supply voltage is switched off.
  • a test voltage which is less than the remote supply voltage of the peripheral device 2 intended for operation is then applied to the central ends of the transmission line 1 and the connection state of the peripheral ends of the transmission line 1 by measuring the central side of the transmission line flowing amount of charge determined.
  • the remote supply voltage is increased to the operating supply voltage when the correct connection state of the transmission line 1 is determined. Basically, no remote supply voltage is maintained on the transmission line 1 before the peripheral device is connected. As a result, the peripheral ends are free of tension and the connection work can be carried out without endangering the assembly personnel. If the correct connection status is determined and the connection work has therefore been completed correctly, the remote supply voltage is increased to the value suitable for operation.
  • the input capacitance of the peripheral device 2 which differs significantly from line or other parasitic capacitances, can be determined via the charge measurement.
  • the input part of a local part 2 is depicted in FIG. 2, which is usually formed by a DC-DC converter 5 which, in addition to capacitors 4 and 6, has a bridge rectifier to enable a polarity-independent connection.
  • the capacitances of the capacitors 4 and 6 are substantially larger than the line capacitances of the transmission line 1 and therefore enable a reliable differentiation based on the charge measurement as to whether the device 2 in question is in the correctly connected state or not.
  • the charge measurement can, however, also be carried out at voltages that are not dangerous for humans.
  • 3 and 4 each show central arrangements which are suitable for implementing the method according to the invention. For this purpose, a unit for generating a voltage jump 10 and a unit for determining the amount of charge 11 delivered into the transmission line are provided in FIG.
  • Fig. 5 also contains equivalent circuit diagrams for a better understanding of the mode of operation.
  • the transmission line 1 is approximately represented by a line resistance R8, a line capacitance C5 and a line inductance Ll
  • the peripheral device 2 for example a local part of pair gain systems or HDSL units, is represented by an input resistor R9 and an input capacitor C4
  • leakage currents resulting from the transmission line 1 are included in resistor R9.
  • the unit for generating a voltage 13 proportional to the current is replaced by a low-ohmic resistor Rl formed at one end with the two-wire transmission line 1 and at the other
  • the time course of the voltage VI and the time course of the current I are mainly determined by the value of the input capacitance C4.
  • the current I rises when the voltage spiral is applied first to its maximum value, since the initially uncharged capacitor C4 acts as a short circuit, and decreases with increasing charging
  • the time-dependent current curve could also be used to measure the input capacity of the peripheral device, but this form of measurement is the one
  • this integrator unit comprises an inverting operational amplifier
  • a resistor R4 is connected in parallel to the integrating capacitor C3, which after the charging process of the
  • Input capacitor C4 prevents the leakage currents that occur due to poor insulation, as can occur, for example, with old lines
  • the resistor R4 is dimensioned such that it discharges the after the charging of the input capacitor C4 Integierkondensators C3 causes and thus lowers the output voltage of the integrator Ul after reaching a maximum value. Due to the characteristic course of the voltage V2 that occurs in the process, as shown in FIG. 8, the correct connection state of the peripheral device 2 can be detected by the comparator unit 15 connected downstream.
  • a reference voltage U re f is provided at the reference input of an operational amplifier U5 forming the comparator unit, and thereby a threshold voltage is established, which is entered in FIG. 8, for example, at 2.5V.
  • the output voltage of integrator U1 exceeds the defined voltage threshold and thus causes the output state of comparator unit 15 to tilt.
  • the integrated charge continues to increase and reaches a maximum value at time t2, at which time input capacitor C4 is in the charged state.
  • the relatively flat gradient after exceeding the maximum output voltage value is determined by the parallel resistor R4, which has a value that is at least a power of ten below the worst possible insulation resistance of the transmission line. Due to the discharge of the integrating capacitor C3, the output voltage V2 of the integrator unit 14 falls below the threshold of 2.5 V and thus causes the output state of the comparator unit 15 to flip again.
  • the time period between times t tl and t3 can thus be further processed by a corresponding logic. Within certain tolerances, the occurrence of this time period can be interpreted as the correct connection of the peripheral device 2.
  • the remote supply voltage should not be upgraded to the operating value, since otherwise Danger to the assembly personnel cannot be excluded. This means that open connections of the transmission line cannot cause any danger or incorrectly connected devices can be prevented from being destroyed.
  • the too high capacitance of the capacitor C4 can be due to the fact that, for example, two or more peripheral devices 2 were erroneously connected in parallel, commissioning should therefore be prevented since the power supply cannot be guaranteed for both devices or the two devices have an excessive supply current would cause on the transmission line and thus excessive power loss.
  • the input part of the district 2 can, however, also be faulty or there can be a transmission line with excessive leakage currents.
  • FIG. 18 An embodiment of the circuit arrangement according to the invention is implemented in FIG. 18, in which the integrator is formed by an RC element.
  • the RC element consists of the resistor R20 and the capacitor C10.
  • the current I caused by the resistor R8 when the peripheral device is correctly connected is shown in FIG. 19 and the voltage curve V2 after integration by the RC element is shown in FIG.
  • the comparator output voltage V3 provides the corresponding detection possibility for the correct ./Vnschlußstatus.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

L'invention concerne un procédé pour raccorder un appareil périphérique alimenté à distance par un organe central par l'intermédiaire d'une ligne de transmission, dans un système de communication. Dans une première étape de ce procédé, l'appareil périphérique est raccordé à la ligne de transmission, la tension d'alimentation à distance étant coupée. Dans une deuxième étape, une tension de contrôle inférieure à la tension d'alimentation à distance prévue pour le fonctionnement de l'appareil, est appliquée aux extrémités de la ligne de transmission, côté central, puis l'état de connexion des extrémités périphériques de la ligne de transmission est constaté par mesure, côté central, de la charge dans la ligne de transmission. Dans une troisième étape, lorsque l'état de connexion correcte de la ligne de transmission a été constaté, la tension d'alimentation à distance est augmentée pour atteindre la tension d'alimentation de service.
PCT/AT1998/000317 1997-12-23 1998-12-21 Procede pour raccorder un appareil peripherique alimente a distance Ceased WO1999034591A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP98960857A EP1042908A1 (fr) 1997-12-23 1998-12-21 Procede pour raccorder un appareil peripherique alimente a distance
IL13683798A IL136837A (en) 1997-12-23 1998-12-21 Method for connecting a remotely powered peripheral unit
SI9820087A SI20296A (sl) 1997-12-23 1998-12-21 Postopek za priključitev daljinsko napajane periferne priprave
AU16466/99A AU1646699A (en) 1997-12-23 1998-12-21 Method for connecting a remotely powered peripheral unit
HU0100695A HUP0100695A3 (en) 1997-12-23 1998-12-21 Method for connecting a remotely powered peripheral unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA2183/97 1997-12-23
AT0218397A AT407321B (de) 1997-12-23 1997-12-23 Verfahren zum anschliessen eines ferngespeisten, peripheren geräts

Publications (1)

Publication Number Publication Date
WO1999034591A1 true WO1999034591A1 (fr) 1999-07-08

Family

ID=3529494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1998/000317 Ceased WO1999034591A1 (fr) 1997-12-23 1998-12-21 Procede pour raccorder un appareil peripherique alimente a distance

Country Status (7)

Country Link
EP (1) EP1042908A1 (fr)
AT (1) AT407321B (fr)
AU (1) AU1646699A (fr)
HU (1) HUP0100695A3 (fr)
IL (1) IL136837A (fr)
SI (1) SI20296A (fr)
WO (1) WO1999034591A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8902760B2 (en) 1998-04-10 2014-12-02 Chrimar Systems, Inc. Network system and optional tethers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089927A (en) * 1989-10-12 1992-02-18 Northern Telecom Limited Power feed circuit for digital communications terminal equipment
US5144544A (en) * 1989-08-31 1992-09-01 Alcatel Business Systems Power feed system for telephone and/or information technology terminals
WO1994010809A1 (fr) * 1992-10-27 1994-05-11 Semcotec Handelsgesellschaft M.B.H. Systeme de transmission d'informations
JPH1013576A (ja) * 1996-06-20 1998-01-16 Fujitsu Ltd 給電回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144544A (en) * 1989-08-31 1992-09-01 Alcatel Business Systems Power feed system for telephone and/or information technology terminals
US5089927A (en) * 1989-10-12 1992-02-18 Northern Telecom Limited Power feed circuit for digital communications terminal equipment
WO1994010809A1 (fr) * 1992-10-27 1994-05-11 Semcotec Handelsgesellschaft M.B.H. Systeme de transmission d'informations
JPH1013576A (ja) * 1996-06-20 1998-01-16 Fujitsu Ltd 給電回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 098, no. 005 30 April 1998 (1998-04-30) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8902760B2 (en) 1998-04-10 2014-12-02 Chrimar Systems, Inc. Network system and optional tethers
US8942107B2 (en) 1998-04-10 2015-01-27 Chrimar Systems, Inc. Piece of ethernet terminal equipment
US9019838B2 (en) 1998-04-10 2015-04-28 Chrimar Systems, Inc. Central piece of network equipment
US9049019B2 (en) 1998-04-10 2015-06-02 Chrimar Systems, Inc. Network equipment and optional tether
US9812825B2 (en) 1998-04-10 2017-11-07 Chrimar Systems, Inc. Ethernet device

Also Published As

Publication number Publication date
AT407321B (de) 2001-02-26
SI20296A (sl) 2000-12-31
ATA218397A (de) 2000-06-15
IL136837A (en) 2004-12-15
HUP0100695A3 (en) 2002-02-28
AU1646699A (en) 1999-07-19
IL136837A0 (en) 2001-06-14
EP1042908A1 (fr) 2000-10-11
HUP0100695A2 (hu) 2001-06-28

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