WO1998044679A1 - Procede et commutateur pour la detection automatique d'une methode de transmission et pour l'adaptation d'un terminal - Google Patents

Procede et commutateur pour la detection automatique d'une methode de transmission et pour l'adaptation d'un terminal Download PDF

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Publication number
WO1998044679A1
WO1998044679A1 PCT/DE1998/000997 DE9800997W WO9844679A1 WO 1998044679 A1 WO1998044679 A1 WO 1998044679A1 DE 9800997 W DE9800997 W DE 9800997W WO 9844679 A1 WO9844679 A1 WO 9844679A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch device
transmission method
transmission
communication network
terminal
Prior art date
Application number
PCT/DE1998/000997
Other languages
German (de)
English (en)
Inventor
Andreas Illg
Karsten Lüdtke
Frank Paetsch
Original Assignee
Teles Ag Informationstechnologien
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
Priority claimed from DE19734775A external-priority patent/DE19734775A1/de
Application filed by Teles Ag Informationstechnologien filed Critical Teles Ag Informationstechnologien
Publication of WO1998044679A1 publication Critical patent/WO1998044679A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0471—Terminal access circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5614—User Network Interface
    • H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5663—Support of N-ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13082—Power supply via phantom line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1309—Apparatus individually associated with a subscriber line, line circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13093—Personal computer, PC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13096—Digital apparatus individually associated with a subscriber line, digital line circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13174—Data transmission, file transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13199—Modem, modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13299—Bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • the invention relates to a method for signal transmission, in particular in telecommunications or data transmission, according to claim 1 and a switch device according to claim 14.
  • Telephone lines are used to a large extent for signal transmission with analog signals. This allows voice, fax or even files to be exchanged between end devices such as telephones, fax machines or computers. Modems are used to convert the analog (eg audio frequency signals of the telephone line) into digital (eg binary signals from a computer) or from digital to analog signals. Even if there have been alternatives to the analog for some time Signal transmission, this cost-effective technology will continue to be of considerable importance in the future.
  • xDSL stands e.g. for ADSL, HDSL and VDSL system or similar systems.
  • hybrid cards in which a computer is connected to an ISDN line, are known. Should an analog transmission method be used with the computer because e.g. If the communication partner only accepts analog signals, the hybrid card can simulate a modem and thus an analog transmission. However, a real switch between different transmission methods (e.g. connecting the hybrid card to an analog line) is not possible with such hybrid cards.
  • the transmission method must be known in advance so that a functioning data transmission is possible.
  • the invention is based on the object of providing a method and a device with which a terminal connected to a communication network can be operated. Various transmission methods should be usable on the communication network without having to know a priori which communication method is used for communication.
  • the method for signal transmission uses a switch device for automatic detection of a transmission method which is used when sending signals to at least one communication network and / or when receiving signals from at least one communication network, so that the terminals connected to the communication network are adapted to the transmission method used in each case become.
  • Communication networks are understood to mean, in particular, telecommunications and data networks. Analog and ISDN data transmission may be mentioned in particular as the transmission methods used.
  • the automatic detection of the transmission method makes it possible for a terminal device to adapt to the transmission method without the need for expensive modifications to the terminal device itself.
  • a terminal can thus be operated on different communication networks or with different transmission methods.
  • the adaptation to a transmission method takes place automatically.
  • the user of a terminal device is relieved by an automatic switchover, since he does not have to make any efforts, for example to switch from analog to ISDN data transmission.
  • the changeover is completely transparent to the user.
  • the automatic detection of the transmission method and / or the adaptation of a terminal to the transmission method takes place in connection with a network terminator (NT) of an ISDN connection.
  • NT network terminator
  • ISDN analog and digital
  • the automatic detection of the transmission method and / or the adaptation of a terminal to the transmission method takes place integrated together in the terminal. This enables a particularly compact design.
  • the switch device in the method according to the invention automatically recognizes the characteristics of an analog signal, an ISDN signal, an xDSL signal and / or an ATM signal. For example, the header information of an ATM signal or an analysis of a digital signal can be used.
  • a terminal can receive or send the signals required in each case without the need for modifications to the terminal.
  • the switch device measures signals coming in from the communication network during a first check of the transmission method.
  • first and second reviews do not necessarily have to be consecutive. Rather, it is within the scope of the invention to use only the first or the second check in each case.
  • the second check of the transmission method is used with particular advantage if the first check has not produced a clear result. This is advantageous since in the field of data transmission there are a large number of national exceptions to the generally applicable data transmission protocols, which may not be clearly identified with a first check. This series connection of the two checks thus serves to increase flexibility, since a wide variety of transmission methods can be identified.
  • an open circuit voltage is measured in the switch device and used to identify an analog transmission method or a data transmission on an ISDN U ⁇ Q interface (between NT and a switching center).
  • the transmission methods mentioned are characterized in different standards by different open circuit voltages, so that a simple voltage measurement that can be carried out can bring a quick result here.
  • the switch device measures phantom power (voltage), with which data transmission on an ISDN Sg interface can be recognized in a simple manner.
  • At least one data packet arriving from the communication network is advantageously examined for its structure.
  • This structure enables data transfers in Ethernet to be identified in a simple and quick manner.
  • the switch device switches on a loop current for checking an analog telephone connection ("the telephone is lifted”). An analog telephone transmission is clearly confirmed by a dial tone that is then received.
  • a line according to an S 0 or U ⁇ - Q ISDN interface specification is likewise advantageously activated by a method according to the invention. Successful activation means that the ISDN transmission method is recognized in a simple manner.
  • An inventive switch device for controlling a data transmission between at least one terminal and at least one communication network connected to the terminal, on which data can be transmitted using at least two different transmission methods allows the at least one terminal to be easily and without cumbersome modifications for data exchange with different ones Transfer methods can be used.
  • the switch device has means for automatic detection of the transmission method used in each case for data reception from the communication network and / or data transmission to the communication network.
  • at least one terminal connected to the switch device is adapted to the corresponding transmission method.
  • a user of a terminal can thus use the switching device according to the invention to switch back and forth between different types of data transmission.
  • the switch device has means for automatically adapting at least one terminal connected to the switch device to the transmission method required in each case.
  • This is e.g. a terminal that is connected to a switch device according to the invention, regardless of the transmission method with which it is addressed from the communication network.
  • An advantageous embodiment of the switch device according to the invention has means for automatically recognizing the transmission method and / or means for adapting to the transmission method, which are connected to and / or integrated in a network terminator (NT) of an ISDN connection.
  • a further advantageous embodiment of the switch device according to the invention has means for automatic detection of the transmission method and / or means for adaptation to the transmission method, which are integrated with or in the terminal.
  • means for automatically recognizing characteristics of an analog signal, an ISDN signal, an xDSL signal and / or an ATM signal are provided. Flexible switching between these transmission methods enables existing resources to be used efficiently.
  • the switch device has checking means for sending and / or receiving signals to the communication network or from the communication network.
  • the transmission methods can be easily identified on the basis of known characteristics.
  • the switch devices have means for measuring an open circuit voltage or phantom power (voltage). These measurements can be carried out quickly and easily, so that the testing of the transmission methods can be carried out just as quickly and easily.
  • the switch device advantageously has means for the structural examination of at least one data packet coming in from the communication network. This enables data transmission in Ethernet to be recognized in particular.
  • Switch devices also advantageously have means for switching on a loop current or for activating a line according to the S 0 or U ⁇ g ISDN interface specification. These means enable reliable detection of the transmission methods. It is particularly advantageous if at least one means for checking the signals sent to and / or received by the communication network is designed as software. Since the software can be easily adapted to the respective circumstances, the configuration is particularly flexible.
  • At least one means for checking the signals sent to and / or received by the communication network is designed as hardware. This allows e.g. Use specialized chips that can work particularly quickly.
  • the means for automatically recognizing the transmission method and / or the means for adapting to the transmission method are designed as software.
  • the switch device can be easily adapted to new transmission methods, which increases flexibility considerably.
  • the means for automatically recognizing the transmission method and / or the means for adapting to the transmission method are designed as hardware.
  • processors specially designed for this purpose a particularly high level of security against unauthorized manipulation can be achieved.
  • Figure 1 is a schematic representation of a switch device according to the invention for the automatic detection of signals that are transmitted with different transmission methods, and for the adaptation of a downstream terminal.
  • Fig. 2 is a schematic representation of the switch device according to the invention in connection with an ISDN network terminator
  • Fig. 3 is a schematic representation of the switch device according to the invention, which is integrated in a terminal;
  • Fig. 4 is a flowchart for the automatic detection of different transmission methods.
  • a switch device 4 In Fig. 1, the function of a switch device 4 according to the invention is shown in principle, with which data from a communication network 2 can be received with different transmission methods 5a, 5b. The data are exchanged between the communication network 2 and a terminal 1, which is connected to the switch device 4 according to the invention.
  • the interface 3 of the network connection e.g. between a household or an office and the communication network 2 is symbolized by a line.
  • the switch device 4 can be connected to more than one communication network 2, in which different transmission methods 5a, 5b are used accordingly.
  • the switch device 4 is connected to a communication network 2, on which, however, different transmission methods 5a, 5b can be used (for example a telephone network with analog or ISDN signals). It is essential that the data can reach the terminal 1 with at least two transmission methods 5a, 5b.
  • the terminal 1 is a computer in the present case. In principle, however, several terminals 1, such as faxes, telephones, servers etc., of the same or different types can also be connected to the switch device 4 according to the invention.
  • the switch device 4 which in the present case is designed as an electronic circuit separate from the terminal, has the task of recognizing the incoming transmission methods 5a, 5b.
  • analog signals 5a e.g. conventional telephone network
  • digital signals 5b e.g. ISDN
  • Software is stored in the electronic circuit of the switch device 4, with which the type of the incoming signals is automatically recognized. For this purpose, each signal is scanned to determine the type of signal and / or the transmission method 5a, 5b. Depending on this, the terminal 1 connected downstream of the switch device 4 is adapted so that it can process the incoming signals.
  • An incoming telephone call or data transmission from the analog communication network 2 is thus automatically recognized as an analog signal and forwarded to a computer telephony system, a telephone (not shown here) or a modem. If data transmission from the switch device 4 is detected using a digital ISDN transmission method 5b, the ISDN hardware and software of the terminal 1 is automatically addressed, which processes the data accordingly.
  • the switch device 4 detects a header of an ATM frame, for example, the downstream devices are adapted so that the data can be received by the terminal 1.
  • the detection of the transmission method 5a, 5b and the adaptation of the terminal devices 1 take place automatically without a user of the terminal device 1 having to interrupt his work or a reconfiguration of the terminal device 1 being necessary; the switchover is completely transparent.
  • the transmission method 5a, 5b is recognized automatically, a user of the terminal 1 e.g. via a display or a display on a screen of the terminal 1 is requested to carry out an adaptation (e.g. switching over the function of the terminal 1 or the switch device 4) by hand.
  • an adaptation e.g. switching over the function of the terminal 1 or the switch device 4
  • the illustrated function of the switch device 4 according to the invention for carrying out a method according to the invention relates to the reception of data from a communication network 2.
  • the device 4 according to the invention and the method according to the invention are suitable for data of different transmission methods 5a, 5b which are sent by one or more terminal devices 1 to be sent to communication networks 2.
  • the switch device 4 it is readily possible for the switch device 4 to automatically recognize data from a video conference, which is transmitted using the digital ATM method due to the high bandwidth required, and to establish a connection to a corresponding communication network 2. If, on the other hand, a modem is selected to send an e-mail, since no large bandwidth is required for this, the switch device 4 according to the invention ensures that a connection to a corresponding analog communication network 2 is established.
  • the switch device 4 has, on the side on which it can be connected to terminals 1, two analog lines a1, a2 to which terminals 1 such as a modem of a computer or analog telephones can be connected. Furthermore, the switch device 4 has an S 0 bus for an ISDN terminal. Depending on the transmission methods 5a, 5b offered on the communication network side, the analog connections al, a2 and the ISDN S Q -BU ⁇ can be operated in different configurations.
  • Such flexible network terminators are typically used when a telephone connection is to be switched from the analog telephone connection to ISDN operation.
  • the flexible network terminator is plugged into an existing TAE socket, whereby the new ISDN devices are connected to the flexible network terminator.
  • the actual changeover between the analog transmission method and the ISDN method takes place via a switching center of a telephone operator company. It is generally not known a priori at what point in time the switchover from the analog to the ISDN method will take place. Since the switchover can take place at any time period of several days, a functional communication of the terminal devices 1 with the communication network 2 is not possible during this time, since the connected terminal device 1 cannot know without special precautions how to interpret incoming signals or outgoing signals must be formed.
  • the flexible network terminator is equipped with a switch device 4 according to the invention, e.g. provided with suitable software, the user of a connected terminal 1 does not have to worry about when and in what way the transmission method 5a, 5b is changed by the telephone operator company.
  • the switch device 4 is integrated or connected together with the terminal 1 or with the switching center, not shown here.
  • FIG. 3 shows a configuration in which a PC as a terminal 1 can communicate with a communication network 2 using an analog transmission method 5a.
  • transmission methods e.g. analogue-digital, analogue-ATM, analogue-xDSL etc.
  • the hardware is connected to the appropriate methods must be adapted.
  • the connections must be exchanged during the changeover.
  • the switch device 4 is integrated together with the terminal 1.
  • the signals are recognized and adapted in a manner similar to that shown in the description of FIGS. 1 and 2.
  • FIG. 4 shows a flowchart which shows how different transmission methods 5a, 5b are recognized by the switch device 4 according to the invention.
  • a switch device 4 is to be used to recognize the following interfaces with their different transmission methods:
  • RJ-45 connectors are used for the ISDN and Ethernet interfaces.
  • the analog telephone line has a 6-pin RJ-11 connector.
  • the two plugs are usually mechanically compatible, so that an RJ-45 plug fits into an RJ-11 socket, and vice versa. Since TAE-6 plugs and sockets are used in Germany, corresponding adapters are required for the RJ plugs. In the following, reference is always made to the contact numbers of the RJ-45 connectors.
  • the transmission methods are identified in several stages. In a first check 101, 102, 103, 104, a preliminary decision is made about the type of data transmission based on static line properties in the idle state. For this purpose, a DC voltage is usually measured between two wire pairs. From this, a statement can be made as to which transmission method is likely to be used.
  • the first check 101, 102, 103, 104 is followed by a second check 121, 122, 123, 124 with a preparatory step 111, 112, 113, 114 in front of it.
  • Preparation step 111, 112, 113, 114 was shown separately here for reasons of clarity; it could also be seen as part of the second review.
  • the different transmission methods can be differentiated quickly and reliably, so that the switch device 4 can be adapted just as quickly and reliably.
  • the embodiment of the invention is not limited to the exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the invention even in the case of fundamentally different types.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé de transmission de données entre au moins un terminal (1) et au moins un réseau de communications (2) relié au terminal (1) et exploité selon au moins deux méthodes de transmission différentes (5a, 5b), en particulier de transmission analogique et RNIS de données. Pendant une première étape (a), le commutateur décrit (4) reconnaît automatiquement la méthode de transmission (5a, 5b) des données transmises et/ou reçues par le réseau de communications (2) et pendant une deuxième étape (b), au moins un terminal (1) relié au commutateur (4) est adapté à la méthode de transmission ainsi détectée (5a, 5b). On peut ainsi exploiter un terminal (1) sans qu'il soit nécessaire de connaître au préalable quelle méthode de transmission (5a, 5b) a été utilisée pendant une communication donnée.
PCT/DE1998/000997 1997-04-03 1998-04-01 Procede et commutateur pour la detection automatique d'une methode de transmission et pour l'adaptation d'un terminal WO1998044679A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19714897 1997-04-03
DE19714897.2 1997-04-03
DE19734775A DE19734775A1 (de) 1997-04-03 1997-08-05 Verfahren und Schaltervorrichtung für eine Signalübertragung
DE19734775.4 1997-08-05

Publications (1)

Publication Number Publication Date
WO1998044679A1 true WO1998044679A1 (fr) 1998-10-08

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PCT/DE1998/000997 WO1998044679A1 (fr) 1997-04-03 1998-04-01 Procede et commutateur pour la detection automatique d'une methode de transmission et pour l'adaptation d'un terminal

Country Status (1)

Country Link
WO (1) WO1998044679A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0942620A2 (fr) * 1998-03-11 1999-09-15 Siemens Aktiengesellschaft Méthode d'initialisation d'un dispositif de terminaison de réseau pour la connexion avec un réseau de communication numérique ou analogue
EP0989772A2 (fr) * 1998-09-23 2000-03-29 Alcatel Dispositif de terminaison de réseau d'un réseau de télécommunication
EP1259093A2 (fr) * 2001-05-16 2002-11-20 ELMEG GmbH & Co. KG Kommunikationstechnik Appareil de terminaison pour un réseau téléphonique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0685848A (ja) * 1992-09-07 1994-03-25 Mitsubishi Electric Corp 通信装置
EP0596648A1 (fr) * 1992-11-02 1994-05-11 National Semiconductor Corporation Détection de la capacité d'un point final d'un réseau
EP0668706A2 (fr) * 1994-01-27 1995-08-23 Siemens Schweiz AG Terminal de réseau
US5577115A (en) * 1995-03-31 1996-11-19 Lucent Technologies Inc. Customer premise equipment interface
EP0762693A2 (fr) * 1995-08-14 1997-03-12 Nec Corporation Unité de raccordement pour un réseau de service cablé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0685848A (ja) * 1992-09-07 1994-03-25 Mitsubishi Electric Corp 通信装置
EP0596648A1 (fr) * 1992-11-02 1994-05-11 National Semiconductor Corporation Détection de la capacité d'un point final d'un réseau
EP0668706A2 (fr) * 1994-01-27 1995-08-23 Siemens Schweiz AG Terminal de réseau
US5577115A (en) * 1995-03-31 1996-11-19 Lucent Technologies Inc. Customer premise equipment interface
EP0762693A2 (fr) * 1995-08-14 1997-03-12 Nec Corporation Unité de raccordement pour un réseau de service cablé

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CRANE E: "ISDN S/T/U AUTOMATIC DETERMINATION AND ACTIVATION INTERFACE", MOTOROLA TECHNICAL DEVELOPMENTS, vol. 17, 1 December 1992 (1992-12-01), pages 41 - 42, XP000329480 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 342 (E - 1570) 28 June 1994 (1994-06-28) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0942620A2 (fr) * 1998-03-11 1999-09-15 Siemens Aktiengesellschaft Méthode d'initialisation d'un dispositif de terminaison de réseau pour la connexion avec un réseau de communication numérique ou analogue
EP0942620A3 (fr) * 1998-03-11 2006-01-11 Siemens Aktiengesellschaft Méthode d'initialisation d'un dispositif de terminaison de réseau pour la connexion avec un réseau de communication numérique ou analogue
EP0989772A2 (fr) * 1998-09-23 2000-03-29 Alcatel Dispositif de terminaison de réseau d'un réseau de télécommunication
EP0989772A3 (fr) * 1998-09-23 2006-02-01 Alcatel Dispositif de terminaison de réseau d'un réseau de télécommunication
EP1259093A2 (fr) * 2001-05-16 2002-11-20 ELMEG GmbH & Co. KG Kommunikationstechnik Appareil de terminaison pour un réseau téléphonique
EP1259093A3 (fr) * 2001-05-16 2005-12-14 ELMEG Communication Systems GmbH Appareil de terminaison pour un réseau téléphonique

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