WO1996032799A1 - Dispositif de communication - Google Patents
Dispositif de communication Download PDFInfo
- Publication number
- WO1996032799A1 WO1996032799A1 PCT/FR1996/000531 FR9600531W WO9632799A1 WO 1996032799 A1 WO1996032799 A1 WO 1996032799A1 FR 9600531 W FR9600531 W FR 9600531W WO 9632799 A1 WO9632799 A1 WO 9632799A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component
- current
- characteristic
- operating point
- continuous
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/066—Telephone sets adapted for data transmision
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
- H04M1/715—Substation extension arrangements using two or more extensions per line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
Definitions
- the subject of the invention is a communication device comprising a detection of the stall of telephone sets, modems or communication devices connected to the same telephone line.
- the invention applies in particular to the automatic detection of the use of a telephone set by a data transmission modem.
- PSTN switched telephone network
- devices such as certain digital television decoders, which use a modem to establish a return connection to the program provider. This connection can be implemented without the knowledge of the viewer, for example at night.
- the viewer may therefore find the telephone line busy when he picks up a handset. This can be annoying and even dangerous when an urgent call needs to be made.
- the subject of the invention is a communication device connected in parallel with at least one communication device on a transmission line, said device and said device being in accordance with a given continuous component gauge, said device being characterized in that it comprises: means placing the operating point as a continuous component of said device alone outside the zones of said template where the continuous component of the current can be zero, means for determining the continuous component of the current flowing in said device, detection means of a variation of said direct current component.
- the operating point of the device according to the invention is adequately chosen so as to be able to obtain a variation detectable of the DC component of the current in said device when one of the devices enters into operation.
- said means for placing the operating point comprise means for generating a characteristic in continuous components such that it has intersections with the possible load characteristics of the transmission line located in zones of said template where the DC component cannot be zero.
- said characteristic in continuous components comprises a point of intersection with the characteristic of charge of 1400 Ohms, said point being located beyond 8.6 V.
- said template comprising a maximum current limit
- the characteristic of said device comprises a maximum slope in the zone delimited by the load characteristics and said maximum limit, said characteristic having a point in common with each possible load characteristic .
- the characteristic of the device then extends over the entire possible operating zone defined by the different load characteristics, the maximum slope maximizing the variation in current introduced for example when a telephone set connected to the same line is lifted.
- said means for detecting a variation of said continuous component comprises a circuit producing the derivative of the signal corresponding to said determined DC component.
- said means for detecting a variation of said DC component comprises means for comparing said determined DC component and the DC component at the operating point of said device alone.
- said device comprises a bridge for rectifying the voltage of the line interposed between the transmission line and an audio signal processing circuit.
- the positive output of the rectifier bridge being connected to the collectors of a first and second transistors mounted as an amplifier, said positive output being connected to the base of the first transistor through a first resistor, said amplifier outputs in a second resistance connected to the neutral output of said rectifier bridge.
- said device further comprises a capacitor connecting the base of the first transistor to the neutral output of the rectifier bridge.
- said device further comprises in series between the input of the amplifier and the neutral output of the rectifier bridge a third resistor, an interruption means and a first reference voltage generator, said means d interrupt closing when the line voltage exceeds a given value.
- said interrupting means and said voltage source comprise a Zener diode.
- said means for determining the DC component measure the voltage across the second resistance. According to a particular embodiment, said means for determining the DC component derive part of the current at the output of the current amplifier towards a current measurement circuit.
- the current branch branch comprises in series a second reference voltage generator and a fourth resistor.
- said detection means make a comparison between the value of the DC component measured by said current measurement circuit and the value of the DC component at the operating point of said device.
- said comparison is carried out with respect to a range around the value of the DC component at the operating point of said device.
- said determination circuit comprises a microprocessor connected to a digital analog converter and to a memory in which the value of the DC component is stored at the operating point, said digital analog converter being connected to the terminals of a resistor coupled to the branch branch through an opto-coupler.
- the invention uses a detector circuit placed in parallel on the signal path. Thus, a voltage drop which can be caused by a detector in series is avoided.
- FIG. 1a is an electrical diagram of a telephone line
- FIG. 1 b is the equivalent of the diagram of FIG. 1 a in continuous component
- FIG. 2 is a graph of the template for the characteristics of a current and voltage component as a DC component, as well as the operating characteristic of a device in accordance with the present embodiment
- FIG. 3 is an electrical diagram of the device. in accordance with this exemplary embodiment.
- a digital television decoder is provided with a modem and connected to the PSTN network of the subscriber to which are also connected a certain number of other stations, whether they are modems, conventional telephone sets or other devices.
- the television decoder checks that it is not busy.
- the television decoder monitors the line to detect the off-hook of a handset. If a call goes off, the data transmission is interrupted and the line released. The two detections can be carried out using the device according to the invention.
- FIG. 1a illustrates in a simplified manner the constitution of a telephone line of the PSTN network.
- the installation includes an audio signal generator 1 with a bandwidth of 300 to 3400 Hz.
- the internal resistance of the generator is symbolized by a resistance 2 of 600 Ohms placed in series with the generator.
- Resistor 2 and generator 1 are connected to the dual conductor transmission line (L1, L2) of the subscriber through two continuous decoupling capacities 3 and 4.
- the bridge of power supply itself it includes a voltage generator 5 in series with an internal resistance 6, and is connected to the lines L1 and L2 through respectively an inductance 7 and an inductance 8.
- the line itself has a length ranging from 0 3.5 km.
- Figure 2 illustrates the imposed size of the continuous characteristics of a device connected to the PSTN network in France.
- the voltage in volts is given on the abscissa, while the intensity is given in milliamps on the ordinate.
- the hatched areas correspond to unauthorized operating points.
- Table 1 gives the coordinates (abscissa-ordered pairs) of the two broken lines delimiting the authorized operating zone. This area is also limited by the two load lines labeled 300 Ohms and 1400 Ohms respectively.
- the detection of a device is carried out by monitoring the intensity of the DC component of the current flowing in the modem.
- the curve D in bold in FIG. 2 represents the DC current and voltage characteristic of the device according to this example, while the curve E in dotted lines represents the sum of the characteristic D and the characteristic of the telephone.
- the operating point X is located outside the zero intensity range, namely beyond 8.6 V in the present example.
- the template limits the DC component to 60 mA, which imposes a bend in the characteristic of the modem.
- a steep slope of the characteristic accentuates the variation in direct current inside the modem.
- FIG. 3 is an electrical diagram of the device according to this embodiment.
- the device comprises a protection circuit 10 against overvoltage, composed of a resistance RP in series with one of the conductors L1 or L2, as well as a resistance 11 varying according to the applied voltage and placed in parallel on the two drivers, after RP.
- the input voltage of the device is VL.
- a MOS relay with a resistor RO in the closed state is placed in series with RP, after the resistor 1 1.
- the two conductors supply a rectifier bridge composed of four diodes D1 to D4.
- the output of the MOS relay 12 is connected between the diodes D1 and D2, the conductor L2 being connected between the diodes D3 and D4.
- the connections between diodes D2 and D3, respectively D1 and D4 represent the "positive" P and "neutral" N outputs of the rectifier.
- the outputs of the rectifier bridge are connected to an audio processing circuit 13.
- This circuit 13 includes a decoupling capacitor 14 of the DC component connected in series between the point P and the primary of a transformer. The primary is also connected to the at ⁇ point N.
- the secondary load of the transformer is represented by a load impedance 16.
- the collectors of two transistors T1 and T2 mounted in Darlington (18) are also connected to the point P.
- the base of the transistor T1 is connected to the midpoint of a resistance bridge formed by a resistor R1 connected to the point P and a resistor R3 connected to point N through a D5 diode in series with a Zenner DZ diode.
- the Darlington can be replaced by another type of amplifier with sufficient gain.
- the Darlington output in this case the emitter of transistor T2 is connected to point N on the one hand through a resistor R2, on the other hand through, in series, two diodes D6 and D7, a resistor R4 and the emitting diode of an optocoupler 19.
- the role of this capacitor is to filter the frequencies corresponding to the audio signals, so as to prevent this signal from disturbing the current in R2.
- One function of the device is to create a continuous characteristic that meets the criteria defined above.
- the characteristic is made up substantially of two straight lines A and B which meet at an elbow C.
- Vrefl is determined by the D5 diode and the Zener diode.
- Vrefl is chosen to be located approximately at 8.6 V with respect to the voltage reference of VL.
- Diode D5 has a behavior as a function of temperature close to that of Darlington and increases the invariance of the characteristics of the circuit as a function of temperature.
- the second reference, Vref2 is determined by the two diodes D6 and D7. It is implemented for dropping out detection.
- REPLAC M NT (ÉGLE 26) ISLAND OF
- the current in the transmitter of T2 is substantially equal in absolute value to the direct current in RP.
- the voltage across resistor R2 gives an adequate picture of this current.
- the diodes D6 and D7 and the resistor R4 derive part of this current towards the optocoupler 19.
- the reference voltage created by D6 and D7 as well as the value of R4 (2.7 kOhm according to the present example) calibrate the current passing by the diode of the optocoupler 19.
- the phototransistor of this optocoupler is connected to a circuit 20 for determining the value of the DC component of the current. The value thus obtained is compared with a range of values located around the operating point X in FIG. 2. When the measured value of the current is outside this range, there is detection of a station in operation connected to the telephone line.
- the value of the current intensity at the operating point X is stored in a memory of the circuit 20.
- the latter also includes a microprocessor and an analog-to-digital converter converting the information supplied by the optocoupler into data interpretable by the microprocessor. According to the present exemplary embodiment, a variation of the order of magnitude of a few mA around this value determines the aforementioned range.
- said value of the intensity of the current at the operating point is automatically reprogrammed by the circuit 20 from time to time, for example at each successful line seizure.
- the detection circuit is implemented on different occasions:
- the modem is put into operation for a short time, the time to stabilize the current inside the circuit and to determine the value of the DC component of the current. In this way, it is possible to check the occupation of the line.
- the determination of the DC component is carried out periodically when a data transmission is in progress. If there is detection of another device in operation during this transmission, the latter is interrupted to give priority to the detected device. Transmission is resumed after a waiting time.
- the frequency of the determination of the DC component is intended to avoid excessive use of the microprocessor of the circuit 20, which can be used for other tasks.
- the circuit 20 comprises a circuit for bypassing the current supplied by the optocoupler. A variation of the current then triggers the stopping of a data transmission by creating an interruption at the level of a microprocessor controlling the modem.
- the device is only used for detecting the off-hook of another device during a communication.
- a safety distance is provided between the limits of the template and the characteristic of the modem.
- the example of embodiment described relates to a device including a modem and transmitting data modulated by the PSTN network. It is obvious that the invention is not limited to this example, any device connected to the PSTN network or a network having similar properties can be modified by a person skilled in the art to implement the invention.
- the point of continuous operation of the modem is chosen to be located in a zone of the template where the DC component of the current cannot be zero, this to avoid the non-detection of a device actually presenting a zero continuous component.
- the areas of the template are also avoided where the DC component of the current of a device other than the modem can be weak enough not to be inducing a variation in current detectable by the modem.
- the gauge in continuous components of figure 2 is the gauge valid in France. However, the invention is not limited to this particular template.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8530763A JPH10504159A (ja) | 1995-04-13 | 1996-04-09 | 通信装置 |
EP96912083A EP0765561B1 (fr) | 1995-04-13 | 1996-04-09 | Dispositif de communication |
DE69628794T DE69628794T2 (de) | 1995-04-13 | 1996-04-09 | Kommunikationsgerät |
US08/750,264 US6240177B1 (en) | 1995-04-13 | 1996-04-09 | Communication device comprising an off-hook detection circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9504478A FR2733108B1 (fr) | 1995-04-13 | 1995-04-13 | Dispositif de communication |
FR95/04478 | 1995-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996032799A1 true WO1996032799A1 (fr) | 1996-10-17 |
Family
ID=9478107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1996/000531 WO1996032799A1 (fr) | 1995-04-13 | 1996-04-09 | Dispositif de communication |
Country Status (6)
Country | Link |
---|---|
US (1) | US6240177B1 (fr) |
EP (1) | EP0765561B1 (fr) |
JP (1) | JPH10504159A (fr) |
DE (1) | DE69628794T2 (fr) |
FR (1) | FR2733108B1 (fr) |
WO (1) | WO1996032799A1 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000151761A (ja) * | 1998-11-18 | 2000-05-30 | Matsushita Electric Ind Co Ltd | 電話装置 |
US6895081B1 (en) * | 1999-04-20 | 2005-05-17 | Teradyne, Inc. | Predicting performance of telephone lines for data services |
GB2355361B (en) | 1999-06-23 | 2004-04-14 | Teradyne Inc | Qualifying telephone lines for data transmission |
DE19946442C2 (de) * | 1999-09-28 | 2003-05-22 | Siemens Ag | Verfahren zum Erkennen des Aushängezustandes |
GB0005227D0 (en) * | 2000-03-03 | 2000-04-26 | Teradyne Inc | Technique for estimatio of insertion loss |
GB2365253B (en) * | 2000-07-19 | 2004-06-16 | Teradyne Inc | Method of performing insertion loss estimation |
AU2002246853A1 (en) * | 2000-10-19 | 2002-07-30 | Teradyne, Inc. | Method and apparatus for bridged tap impact analysis |
US6687344B1 (en) | 2001-09-07 | 2004-02-03 | Pctel,Inx. | Parallel handset on-hook/off-hook detection by software-based signal power measurement |
US7386039B2 (en) * | 2003-09-26 | 2008-06-10 | Tollgrade Communications, Inc. | Method and apparatus for identifying faults in a broadband network |
DE102004040575A1 (de) * | 2004-08-21 | 2006-02-23 | Abb Patent Gmbh | Einrichtung zum Messen von elektrischem Strom, Spannung und Temperatur an einem aus starrem Material bestehenden elektrischen Leiter |
DE102012016163A1 (de) | 2012-08-14 | 2014-02-20 | Schoeller Arca Systems Gmbh | Behälter mit Eingriffsschutz, insbesondere Postbehälter |
US10306057B1 (en) * | 2016-01-07 | 2019-05-28 | William Sasso | Automatic call blocking and routing system and method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0430137A1 (fr) * | 1989-11-30 | 1991-06-05 | Alcatel Business Systems | Agencement adaptateur pour circuit intégré de poste ou terminal téléphonique téléalimenté par une ligne de type analogique |
EP0613286A1 (fr) * | 1993-02-26 | 1994-08-31 | Sharp Kabushiki Kaisha | Dispositif de communication utilisant une ligne publique |
JPH0723129A (ja) * | 1993-06-30 | 1995-01-24 | Ricoh Co Ltd | 網制御回路の構成方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686697A (en) * | 1983-11-21 | 1987-08-11 | Lifeline Systems, Inc. | Telephone care system with telephone line-checking |
US4998271A (en) * | 1989-08-28 | 1991-03-05 | Venture Technologies, Inc. | Telephone accessory |
US5592529A (en) * | 1994-09-29 | 1997-01-07 | International Business Machines Corporation | Telephone inadvertent off-hook condition detector |
-
1995
- 1995-04-13 FR FR9504478A patent/FR2733108B1/fr not_active Expired - Lifetime
-
1996
- 1996-04-09 EP EP96912083A patent/EP0765561B1/fr not_active Expired - Lifetime
- 1996-04-09 JP JP8530763A patent/JPH10504159A/ja active Pending
- 1996-04-09 DE DE69628794T patent/DE69628794T2/de not_active Expired - Lifetime
- 1996-04-09 US US08/750,264 patent/US6240177B1/en not_active Expired - Lifetime
- 1996-04-09 WO PCT/FR1996/000531 patent/WO1996032799A1/fr active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0430137A1 (fr) * | 1989-11-30 | 1991-06-05 | Alcatel Business Systems | Agencement adaptateur pour circuit intégré de poste ou terminal téléphonique téléalimenté par une ligne de type analogique |
EP0613286A1 (fr) * | 1993-02-26 | 1994-08-31 | Sharp Kabushiki Kaisha | Dispositif de communication utilisant une ligne publique |
JPH0723129A (ja) * | 1993-06-30 | 1995-01-24 | Ricoh Co Ltd | 網制御回路の構成方法 |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 19, no. 635 * |
TOUTE L'ELECTRONIQUE - N.522, no. 5, March 1987 (1987-03-01), PARIS, FRANCE, pages 83 - 86, XP002010317 * |
Also Published As
Publication number | Publication date |
---|---|
DE69628794D1 (de) | 2003-07-31 |
DE69628794T2 (de) | 2004-04-22 |
FR2733108B1 (fr) | 1997-05-16 |
JPH10504159A (ja) | 1998-04-14 |
EP0765561B1 (fr) | 2003-06-25 |
EP0765561A1 (fr) | 1997-04-02 |
FR2733108A1 (fr) | 1996-10-18 |
US6240177B1 (en) | 2001-05-29 |
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