DE10336020B4 - Test system and method for centralized testing of subscriber lines in a telecommunications network - Google Patents

Abstract

Test system for centrally carrying out tests of subscriber lines (AL _analogue , AL _xDSL , AL _ISDN ) and / or connection lines in a telecommunication network with a main distributor (HVT) connected to an exchange (VST), whereby an access multiplexer (DSLAM) is sent to the main distributor (HVT) and / or a splitter (SPV) connected or integrated in the main distribution (HVT), and with analog or digital subscriber equipment (FeAP, TE), which via a subscriber line circuit (TAE) or a subscriber modem (DSLM) and splitter (SPT) or a Network termination (NTBA) and the subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) are connected to the main distributor (HVT) and looped through, which has:
• at least one central measuring station (MP),
At least one metal test access (MTA) arranged in or at the main distributor (HVT),
At least one test device (PG3) which can be connected via a test bus (PB1, PB2, PB3) to the main distributor (HVT), the test bus (PB1, PB2, PB3) having three bus sections and the first bus section (PB1) being connected between test device (PG3) and metallic test access (MTA), the second bus section (PB2) between metallic test access (MTA) and ...

Description

The The invention relates to a test system (Claim 1 and 2). Furthermore, the invention relates to a method to the central implementation of exams the subscriber lines in a telecommunications network (claims 4 and 5).

The Plurality of connections to the Internet or other data services gets over with modems a telephone cable, i. a copper double wire (so-called a / b wire pair or subscriber line) made, which actually for voice transmission is provided in the range of about 300 Hz to 3400 Hz (POTS).

Around a maximum to transmission security to ensure, is becoming increasingly the existing analog transmission technology through the digital transmission technology replaced. In the wired transmission technology come here mainly systems are used, which according to the standard for "Integrated Services Digital Network ", short ISDN, work.

With Help a crossover, for example, a splitter matrix, be Speech and data are usually separated by passive low-pass or high-pass filters and on the telephone line (for example for a DSL transmission procedure). The voice connections go to a classic exchange, called PSTN (Public Switched Phone Network), and the data goes to the splitter to a DSLAM (Digital Subscriber Line Access Multiplexer - a device which converts the signals of several DSL lines into a broadband channel). A sharp dividing line between conventional telecommunications networks and computer data networks can not be pulled at this point therefore become. Both ends of the connection will be DSL modems as the most important element for a DSL connection turned on.

in the DSLAM, for example, the ADSL technology (Asymmetric Digital Subscriber Line, asymmetric DSL data transmission method) become. Below is a transmission technology Understand the high bandwidth of both Plain Old Phone Services (POTS) or ISDN for the call transfer as well as an unbalanced multimedia service without regenerators on the same pair of wires trouble-free allows. Asymmetric (ADSL) because of the direction from the user to the Network (upstream) the transmission relatively low-rate (for example, at about 800 kbps), in the direction from the network to the user (downstream), however, relatively high rate (for example with up to approx. 8 Mbit / s). In addition to ADSL technology are others DSL techniques in use, for example, HDSL = High Data Rate Digital Subscriber Line; SDSL = Single Line Digital Subscriber Line; MDSL = Multirate Digital Subscriber Line; RADSL = Low Rate Adaptive Digital Subscriber Line and VDSL = Very High Rate Digital Subscriber Line, each for the use case are optimized and summarized under the generic term xDSL transmission technology become.

If the participant experiences disruptions in the operation of the xDSL connection, an error should first be ruled out with the network operator in the switching technology or existing errors should be limited and eliminated. In order to provide an improved testing facility for ADSL facilities is out of the DE 101 40 545 A1 a test adapter for testing a telephone line with additional ADSL facilities known. The test adapter makes it possible to switch the centrally located on the main distributor connections to the remote ADSL modules, consisting of modem and splitter, so that a check of the ADSL access of the switching device is made possible without interrupting the telephone connection. The test adapter is equipped for this purpose with two test plug with tabs and on both sides electrically separate plug contact surfaces, which are connected via a switching device, such as a commercial, 4-pin miniature switch, and wherein the isolator contacts are closed during operation. To test an ADSL port with the test adapter, place a function switch of the test adapter in the "plug in" position and plug the test plugs into the corresponding isolating plug. Then a test modem is switched on, put the function switch of the test adapter in position "Check" and checked the ADSL access. The corresponding connections are reassigned so that a test modem connected to the switching device is connected to the ADSL device to be tested and the direct connection from the subscriber to the telephone exchange is not interrupted. After completion of the test, the test modem is removed again, put the function switch of the test adapter in the "plug" position and removed the test adapter.

Furthermore, from the DE 100 47 910 A1 a method and an arrangement for testing and maintenance of an exchange in a Telekomiunikationsnetz and the connected lines and devices known. In order to improve the decentralized control of the test process is provided in detail that a tester is connected to any digital subscriber line in the telecommunications network and that the control of the running in the exchange for testing and maintenance test process using this tester. In further Embodiment is provided that the instruction set for controlling the test process displayed on an output unit of the tester, the individual commands selected by input unit of the tester and sent to the exchange, the commands are stored in particular in the tester or transmitted from the exchange to this. The test personnel are at any time before the available processes for testing and maintenance, which can be started by selecting a menu item on the display of a telecommunications terminal in the exchange. By supplementing the displayed command with additional data, for example, a test order for a subscriber number associated with a subscriber line can be requested in a simple manner. If necessary, it is also possible to modify data that serves to test and maintain an exchange. If the commands are transmitted from the central office, there is an efficient way to introduce new functions or to modify existing functions, since the changes must be made only in the central office and not in the individual test devices. The testing process may include measuring electrical parameters of telecommunications terminals, lines and modules, in particular measuring electrical voltages, currents, resistances, capacitances and inductances. Thus, basic parameters can be measured in the telecommunications network and transmitted to the tester, with analog search sounds can be fed into connected to the exchange lines or the test process includes the establishment of a call connection. Finally, test processes can also be controlled from other data networks, wherein the testing device is a personal computer, in particular a portable personal computer, provided with means for transmitting and receiving digital data.

Furthermore, from the DE 101 07 438 A1 a method for determining the transmission parameters of a transmission path for high bit rate data transmission known, wherein the transmission path consists of a line module in an exchange, a modem at a subscriber and a subscriber line for connection between line module and modem. In order to determine the transmission parameters of the data transmission between the xDSL modem, the subscriber line and the line module in one operation, the xDSL modem and the line module are actively included in the measuring process, which is used to determine the parameters of the transmission path for high bit rate data transmission. The measuring process thus extends to the modem, the subscriber line and the line module. For this purpose, the line module has a line module test transmitter for generating first test signals and for sending these test signals to a modem. The modem receives these first test signals using a modem test receiver. A modem evaluation device evaluates the first test signals with respect to the transmission parameters of the transmission path or of the transmission channel from the line module to the modem. A modem protocol sender then sends a test protocol to the line module. The test protocol contains the evaluation of the first test signals; the line module receives the test protocol by means of a line module protocol receiver. To determine the transmission parameters from the modem to the line module, the modem has a modem test transmitter. The modem test transmitter generates and sends second test signals to the line module in the central office. The line module has a line module test receiver for this purpose. The evaluation of these test signals with regard to the transmission parameters of the transmission path or the transmission channel from the modem to the line module is performed by a line module evaluation device. The determination - the transmission parameter can be separated for both directions (modem according to line module and vice versa) or carried out in a measuring process. Only one technician is needed for the measurement of the transmission link, namely in the central office. This sets a test order for the transmission link of a particular subscriber, whereupon the measurement is performed automatically. Furthermore, the transmission parameters of the entire transmission path, including the modem, subscriber line and line module, can be determined in one operation. This reduces the effort required for commissioning and maintaining an xDSL transmission link; there is no external test device and no more technician use at the participant required.

Furthermore, it is already known before starting the actual data transmission, and before connecting a subscriber-side modem (single-ended operation) by the respective transmitting or transmitting / receiving unit one or more parameters characterizing the respective subscriber line (line length, terminating impedance, position from bridge taps, etc.) (prequalification procedure). In a method alternative to the prequalification procedure (diagnostic method), the check can also be carried out after connection of a subscriber-side modem (double-ended operation). To determine the line characteristic (s) with relatively high selectivity, is from the DE 101 54 937 C1 a device is known, which is such that it can cause the output of a test signal on the line, and the line characteristic or the Lei tion properties determined from the echo signal received via the line. The device for determining line properties can, for. B. in a local exchange and has a signal processing device to which the untransformed echo signal or an obtained, untransformiertes signal is supplied, and which processes the echo signal or the signal derived therefrom. In detail, a signal transformation device is provided which transforms the corresponding signal processed by the signal processing device into the frequency domain and determines the line characteristic or the line characteristics from a vector representing the strength of individual frequency domain spectral components of the corresponding processed signal. For this purpose, the vector representing the individual frequency-domain spectral components is compared with a plurality of pattern vectors. The signal processing device processes the echo signal or the signal obtained therefrom or the pattern vectors are selected so that they have the greatest possible distance, in particular Euclidean distance to one another. The test signal is obtained from a pseudorandom bit string and this pseudorandom bit string can be modulated by means of a DSL method, for which the apparatus comprises a control device, in particular a digital signal processor, which causes the output of the test signal. Alternatively, the determination of the property or of the properties of the line can be carried out by a further control device, in particular by a host processor (eg a further general task for one or more modems, which is arranged on the corresponding modem module) ), be performed. During simulation, the subscriber line is disconnected from the local loop modem in response to a signal provided to a relay by the controller or digital signal processor.

Farther is from US 2002/0101823 A1 a method and an apparatus for testing within the central office of a plurality of line termination circuits, with those telephone sets and / or data terminal and / or connection circuits are connected, known. To the line connection circuits with the BORSCHT functions is for forwarding / receiving digital words a PCM bus and onward to control the inspection process an internal test bus and a control bus (backplane bus) connected. to automatic testing line termination circuits with POTS and DSL connections, contains the device a control device and a with this and the tester connected to the line terminal circuits, wherein during the test the respective subscriber line disconnected with a relay becomes.

Furthermore, from the US 6,259,676 B1 a test system with a combination of a test bus with superimposed switch bus and switching elements known. The test device can be coupled via a test bus integrated in the access node. However, this is not suitable for the lines with xDSL services, since the tester / the measuring head does not "see" the line directly, but only through the splitter, ie only the low-frequency signal components are fed to the measuring head. Thus, a measurement technique in the extended frequency range, which is used by the xDSL services, in particular testing without the influence of the splitter is not possible.

Furthermore, from the DE 101 37 219 C1 an electronic dialing system and a method for prequalification of subscriber lines known. In order to easily perform the prequalification of operating subscriber lines in accordance with the POTS or ISDN standard, without having to use separate test equipment, means are provided for prequalification of subscriber lines in the at least one xDSL subscriber line module, wherein at least one subscriber line output to a test bus An input / output is designed to be routable via a first output circuit.

Furthermore, a test bus is provided between the at least one xDSL subscriber line module and the at least one POTS / ISDN subscriber line module and control means in the management and control system, which carry out a prequalification of a subscriber line connected to a POTS / ISDN subscriber line module redirects a subscriber line port output of the at least one xDSL subscriber line subassembly. The first output circuit is configured such that either the subscriber line or the test bus input / output is connected to a subscriber line connection output of the xDSL subscriber line module. Furthermore, it is proposed to implement the second output circuit such that either a subscriber line connection output or the test bus input / output is connected to a subscriber line of the POTS / ISDN subscriber line module. As a result of this design of the output circuits, it is possible to ensure trouble-free testing of an "old" subscriber line of the POTS / ISDN subscriber line module, even with fully occupied connections in the xDSL subscriber line module. Finally, in at least one of the xDSL subscriber line modules, at least one subscriber is present line connection output switchable reference impedance, with which the means for prequalification can be tested for operability and / or calibrated. This embodiment makes it possible to operate internal fault diagnostics, or to carry out a calibration of the prequalification function on the basis of the known reference impedance. Furthermore, this is from the DE 101 37 219 C1 known method, characterized in that controlled by a management and control system, a subscriber line output of the xDSL subscriber line module is connected via a test bus on one of the subscriber lines of the POTS / ISDN subscriber line module and the integrated prequalification function of the xDSL subscriber line module, the subscriber line POTS / ISDN Subscriber line module is tested. That from the DE 101 37 219 C1 Thus, known methods require an integrated testing technique in the subscriber line module and the integration of the access multiplexer in the central office to enable a uniform testing technique. In this case, at least one relay in the coupling matrix must be kept at the main distributor for each line / xDSL line in order to be able to selectively guide the line to the measuring head / testing device.

A similar way in which a uniform testing technique is provided at a very high cost for the entire system is taken in the test system according to WO 03/065699 A1. It is mandatory that all Telnehmeranschlussleitungen running together on the main distribution over a switching matrix (metallic test access) are performed. The metrological access to the lines is made exclusively via the test device and a permutator with a large number of integrated connection units. This concept of integrated test technology, including the integration of the access multiplexer, requires exactly the same as that from the DE 101 37 219 C1 known concept, a considerable investment of the network operator and is not suitable for a gradual migration on the basis of today's architecture.

As the above assessment of the prior art are differently designed Methods and apparatus for testing an exchange in a telecommunication network and the connected lines and devices known. For purposes of filtering, Commissioning or maintenance of analog or ISDN lines usually the test bus used by the respective exchange. This will be partly external testing technology using external switching networks to the test bus the exchange switched on and thus the physical Access to the respective connecting cable made.

• • Zusätzliche Kosten für Anschaffung und Betrieb eines eigenen Messsystems für xDSL-Leitungen und
• • Erhaltungsaufwand für ursprüngliches Messsystem für POTS-Leitungen bleibt bestehen.

With the introduction of xDSL technologies, new requirements regarding the prequalification (prequalification procedure) of the line for DSL operation and new requirements for the suppression and maintenance of these lines with connections already switched to DSL technology are being introduced to the testing technology. These new requirements can be realized only partially via the previous connection via the test bus of the exchange. Taking into account the aforementioned prior art, it would be conceivable to now realize the test access to the connecting line via a broadband test bus. In this case, the low-pass effect of the exchange affects. The implementation of this approach will typically result in the introduction of a new xDSL line testing system that will be introduced and operated in parallel with the existing POTS line testing system. This approach has some disadvantages:

• • Additional costs for purchasing and operating your own measuring system for xDSL cables and
• • Maintenance effort for original POTS line measurement system remains.

in the Trap of disturbances is to determine from the exchange whether the section to the area of responsibility the user in order or disturbed is. This basically causes problems because the interface to the user is not non-reactive, and because between loop switch and user terminals inevitably switching elements lie. It can happen on the one hand, that by a disturbance in the User the command transmission prevents, and on the other hand, that the diagnosis is error-free is, although at the user terminals, for example, one of the network termination caused disturbance is present. Therefore, in practice, a device and a method are lacking to carry out exams the subscriber lines in a telecommunications network, which cost a uniform testing technique for POTS and xDSL lines including the prequalification (prequalification procedure) and a fast and secure location in digital transmission systems allows. This is particularly significant because the telecommunications industry as extremely advanced, development-friendly industry are very fast Take up and put into action improvements and simplifications.

The invention is compared to the known devices and methods for performing tests of the subscriber lines in a telecommunications network the task of providing such a test system and a method for this purpose, which cost a uniform and improved testing technology for POTS and xDSL cables.

• • mindestens einen zentralen Messplatz,
• • mindestens einen im oder am Hauptverteiler angeordneten metallischen Testzugang,
• • mindestens ein über einen zum Hauptverteiler geführten Prüfbus anschaltbares Prüfgerät, wobei der Prüfbus drei Busabschnitte aufweist und der erste Busabschnitt zwischen Prüfgerät und metallischen Testzugang, der zweite Busabschnitt zwischen metallischen Testzugang und Zugangsmultiplexer und der dritte Busabschnitt zwischen metallischen Testzugang und Vermittlungsstelle geführt ist,

derart, dass zur Migration der Prüftechnik in eine einheitliche Prüftechnik für POTS- oder ISDN- oder xDSL-Leitungen der Prüfzugriff des zentralen Messplatzes mittels Prüfgerät auf die Teilnehmeranschlussleitungen und/oder Verbindungsleitung zusammengeführt wird, indem die zweiten und dritten Busabschnitte auf den ersten Busabschnitt des Prüfbusses unter Verwendung der Schaltglieder des metallischen Testzugangs zusammengeführt werden.This object is achieved according to the invention in a test system for the central execution of tests of subscriber lines and / or interconnections in a telecommunication network with a main distributor connected to an exchange, wherein an access multiplexer and / or a splitter are connected to the main distributor or integrated in the main distributor, and with analog or digital subscriber devices which are connected and looped via a subscriber line circuit or a subscriber modem and splitter or a network termination and the subscriber lines to the main distributor, solved according to claim 1, which comprises:

• • at least one central measuring station,
• At least one metal test access arranged in or on the main distributor,
• At least one test device which can be connected via a test bus routed to the main distributor, the test bus having three bus sections and the first bus section between test device and metallic test access, the second bus section between metallic test access and access multiplexer and the third bus section between metallic test access and switching center,

in such a way that, for the migration of the test technology into a uniform test technology for POTS or ISDN or xDSL lines, the test access of the central measuring station is brought together by means of test equipment on the subscriber lines and / or connecting line by the second and third bus sections on the first bus section of the test bus be merged using the switching elements of the metallic test access.

• • Service, Inbetriebnahme und Entstörung von POTS-Leitungen,
• • Vorqualifizierung,
• • Service, Inbetriebnahme und Entstörung von xDSL-Leitungen und
• • Prüfen von direkt geschalteten Leitungen zu anderen Netzbetreibern

mit nur einem Prüfsystem sowie das Umgehen der Tiefpasswirkung der Vermittlungsstelle. Der Prüfprozess wird dabei mit Hilfe der Prüfgeräte, welche mit der Vermittlungsstelle in Verbindung stehen, gesteuert. Das mit der Prüfung und Instandhaltung betraute Personal muss den Test also nicht vor Ort durchführen, sondern kann diesen beispielsweise von einem Call Center aus durchführen. Das erfindungsgemäße Prüfsystem entlastet somit den Wartungstechniker, wobei für jede Vermittlungsstelle zumindest ein Prüfkopf/Prüfgerät vorgesehen ist. Weiterhin ist von Vorteil, dass die Busabschnitte jeweils kurz gehalten werden können und im metallischen Testzugang jeweils ein einfacher Schalter ausreichend ist.The test system according to the invention has the advantage that in the exchanges, in which xDSL technology is built, the previous test technology for POTS or ISDN lines separated from the test bus of the exchange and specially reserved for this purpose Anschaltepunkte the arranged in or on the main distributor switching matrix be guided. This measure ensures that there is a uniform connection for the purpose of testing the connection line. Further advantages of the solution according to the invention are:

• • Service, commissioning and interference suppression of POTS lines,
• • pre-qualification,
• • Service, commissioning and debugging of xDSL cables and
• • Checking directly connected lines to other network operators

with only one test system and bypassing the low-pass effect of the exchange. The testing process is controlled by means of the test equipment, which are connected to the exchange. The personnel entrusted with testing and maintenance do not have to perform the test on site, but can do so from a call center, for example. The test system according to the invention thus relieves the maintenance technician, with at least one test head / test device being provided for each exchange. Furthermore, it is advantageous that the bus sections can each be kept short and in the metallic test access in each case a simple switch is sufficient.

• • minestens einen zentralen Messplatz,
• • mindestens einen im Prüfgerät angeordneten metallischen Testzugang und
• • mindestens ein an einen Prüfbus, welcher mit dem Hauptverteiler in Verbindung steht und welcher zwei Busabschnitte aufweist, wobei der erste Busabschnitt zwischen metallischen Testzugang und Zugangsmultiplexer und der zweite Busabschnitt zwischen metallischen Testzugang und Vermittlungsstelle geführt ist, anschaltbares Prüfgerät,

derart, dass zur Migration Prüftechnik in eine einheitliche Prüftechnik für POTS- oder ISDN- oder xDSL-Leitungen der Prüfzugriff des zentralen Messplatzes mittels dem Prüfgerät auf die Teilnehmeranschlussleitungen und/oder Verbindungsleitung zusammengeführt wird, indem die ersten und zweiten Busabschnitte auf die Schaltglieder des metallischen Testzugangs des Prüfgeräts zusammengeführt werden.Furthermore, this object is achieved according to the invention in a test system for the central implementation of tests of subscriber lines and / or interconnections in a telecommunications network with a central distributor connected to an exchange, with an access multiplexer and / or a splitter are connected to the main distributor or integrated in the main distributor, and with analog or digital subscriber devices which are connected and looped via a subscriber line circuit or a subscriber modem and splitter or a network termination and the subscriber lines to the main distributor, according to claim 2, which comprises:

• • at least one central measuring station,
• • at least one metal test access arranged in the test instrument and
• At least one connected to a test bus, which communicates with the main distributor and which has two bus sections, the first bus section between metallic test access and access multiplexer and the second bus section between metallic test access and switching center, connectable test device,

in such a way that the test access of the central measuring station is combined by means of the test device with the subscriber access lines and / or connecting line for the migration of test technology into a uniform test technology for POTS or ISDN or xDSL lines, by connecting the first and second bus sections to the switching elements of the metallic test access be brought together of the tester.

in the Comparison to the test system according to claim 1, the test system according to claim 2 has the advantages on that the test bus shorter guided that can be a costly installation of the metallic Test access in the main distributor is not required and that therefore the new test system can be put into operation immediately.

Farther This object is according to claim 4 or claim 5 in a method for performing exams of subscriber lines and / or connecting lines in a telecommunications network by means of a test system according to claim 1 or Claim 2 solved.

• • die Prüftechnik des dritten Prüfgeräts ist kompatibel zur Prüftechnik des ersten bzw. zweiten Prüfgeräts bezüglich der POTS- bzw. ISDN-Messungen,
• • die Prüftechnik des dritten Prüfgeräts ist kompatibel zur Prüftechnik des ersten bzw. zweiten Prüfgeräts bezüglich der Ansteuerung durch die zentrale Applikation,
• • die Prüftechnik des dritten Prüfgeräts ist erweiterbar um Messtechnik für die Vorqualifizierung der Anschlussleitung,
• • die Prüftechnik des dritten Prüfgeräts ist erweiterbar um Messtechnik für die breitbandige Messung der Anschlussleitung.

The inventive method according to claim 4 or claim 5 allows in a simple manner the cost-effective migration of testing technology for POTS or ISDN lines in a uniform testing technology for POTS, ISDN and xDSL lines. In general, should apply:

• The test equipment of the third tester is compatible with the test technique of the first or second tester with regard to the POTS or ISDN measurements,
• The test technique of the third tester is compatible with the test technique of the first or second tester with respect to the control by the central application,
• • the test equipment of the third tester can be extended by measuring technology for pre-qualification of the connecting cable,
• • The test equipment of the third tester can be extended by measurement technology for the broadband measurement of the connecting cable.

Farther can audit processes which are stored centrally in the measuring station, comparatively simple be changed or extended by the operator of a telecommunications network, It is a substantial increase in the area of application allows and It can do a variety of maintenance tests and maintenance under fast and secure data transmission between testing device, exchange and central measuring station become.

at a preferred embodiment of the invention is, according to claim 3, the central measuring station designed as a PC and this is for control the test via control lines with the central office, the access multiplexer and the main distributor in connection.

• – Rufnummernorientierte Prüfung von Teilnehmeranschlüssen,
• – Gruppenprüfung mit Auflistung der einzelnen Messwerte,
• - Einzelprüfungen spezieller Art,
• – Einspeisen von analogen Suchtönen für die Leitungsidentifizierung,
• – Messen und Speichern der charakteristischen Leitungsdaten,
• - Zugriff auf eine zentral geführte Datenbank sowie
• - Kontaktaufnahme mit dem Teilnehmer zum Zwecke der Fehlerbehebung.

This embodiment of the invention has the advantages that overall a higher quality standard (Quality of Services = QoS) can be achieved, that occurring errors can be quickly resolved, that a flexible adaptation of the measurement or extension of functionality - for example, the most diverse Transmission method or for the determination of line parameters z. As to the use of time domain based Refiexionsmesstechnikverfahren or TDR method (TDR = Time Domain Reflectometry) or frequency range-based reflection measurement technique (FDR method, FDR = Frequency Domain Reflectometry) or pre-qualification method or diagnostic method - allows the controller of the test process can be carried out from the call center and that the decentralized control of a test process running in the measuring station / call center is made possible. It is also possible to carry out the checks from any point in the telecommunication network by means of a PC / web server or by means of a mobile measuring station (GSM or, in the case of higher bandwidths, UMTS), wherein the network connection can take place via an IP interface (also packet-switched network). The tests include, for example, the

• - Number-based checking of subscriber lines,
• - group check with listing of the individual measured values,
• - individual tests of a special kind,
• - feeding analogue search tones for line identification,
• Measuring and storing the characteristic line data,
• - Access to a centrally managed database as well
• - Contact the participant for the purpose of troubleshooting.

Farther this embodiment of the invention has the advantages that the testing personnel at any time the available standing processes for examination and maintenance, which by selecting a menu item can be started on the display of the central measuring station. By complement of the displayed command with additional For example, data may be a test job for one a subscriber number associated subscriber connection in a simple manner be requested. If necessary, data can also be changed in this way the exam and maintain an exchange. Be the commands transmitted from the central measuring station, is a particularly powerful Procedure for introduction new features or to change existing functions available, because the changes only in the central measuring station and not in the individual Testing equipment. Farther is that with the test and maintenance entrusted test personnel immediately after the end of an exam the result before. Based on this, further decisions can be made quickly taken, or further test orders are transmitted, taking time-consuming or compute-intensive testing also to a later one Time carried out can be to which this process is not detrimental to the use of the telecommunications network and also routinely testing processes triggered and the results obtained can be stored. Farther can testing processes be controlled from other data networks.

Finally is in development of the invention, according to claim 7, the controller the testing process secured against unauthorized access and the expiry of the review process is at the respective test device in the central Measuring station logged.

These Development of the invention has the advantage that the test or Maintenance can only be carried out by the entrusted test personnel. It is possible, too, access to different groups of processes with different ones Secure access codes so as to have the responsibilities within the inspection staff demarcate or distribute differently. For example, CUG (closed user group) via ISDN are formed, so that the previously used method of callback numbers can be omitted and, for example, a displacement of the measuring head not to a software change leads.

Further Advantages and details can be found in the following description a preferred embodiment of the invention with reference to the drawing. In the Drawing shows:

1 the block diagram of an embodiment of the test system according to the invention,

2 the block diagram of an embodiment for the previous centralized metrology and

3 the arrangement of the metallic test access in the main distributor or in the tester.

in the Field of public Telephony (analogue / ISDN lines) is used by larger network operators for the purpose Centralized the commissioning and maintenance of customer lines Measuring technology used.

In this case, the installation of suitable access technology (coupling fields) and measurement technology is usually carried out in the respective exchange. The physical access to the customer lines takes place using the existing switching networks in the switching systems. In addition, external switching networks (see KF, 2 ) is used for further concentration on a measuring bus.

The Control of the measuring technology or the coupling fields takes place either locally or centrally, e.g. from the workplaces of a call Center. Here, the parameterization of the respective measurement takes place as well as the evaluation and representation of the measured values for diagnostic purposes.

By the introduction xDSL techniques create additional metrological requirements in the field of pre-qualification of existing analogue Lines or ISDN lines for xDSL services as well as metrological requirements regarding the maintenance and suppression of already in operation xDSL lines.

Depending on the measuring philosophy, new crosspoints sometimes have to be set up (see DSLAM, 2 ) to perform a broadband measurement.

These new requirements are different by the individual network operators solved. So In the field of pre-qualification of the lines, both metrological Procedures and data-technical approaches (line databases) pursued. The maintenance or suppression from xDSL lines usually requires the introduction of new measurement technology.

• • Einsatz von Außendienstkräften unter Verwendung von tragbarer Messtechnik.
• • Auslesen der DSLAM-Informationen über geeignete Schnittstellen.
• • Verwendung von in die Übertragungstechnik integrierter bzw. externer Messtechnik.
• • Verwendung von Datenbankinformationen aus Leitungsdatenbanken.
• • Verwendung von Expertensystemen.

The following solution models can be found at the individual network operator:

• • Use field staff using portable instrumentation.
• • Reading out the DSLAM information via suitable interfaces.
• • Use of measuring technology integrated or external to the transmission technology.
• • Use of database information from pipeline databases.
• • Use of expert systems.

Depending on The maintenance concepts of the individual network operators become these systems pro active (i.e., measurements are made regularly; problems will be recognized in part before the customer) or the measurements will be only in the case of a recognized or by the customer made fault report carried out.

As can be seen from the above explanations, the introduction of xDSL services usually leads to the introduction of new measurement technology, which is operated in parallel to the measurement technology for analogue / ISDN lines. 2 shows in detail the block diagram of an embodiment for the previous centralized measurement technology.

The centralized measurement technology is based on a telecommunications network with a central office VST connected to the main distributor HVT, wherein the main distributor HVT an access multiplexer DSLAM and / or a splitter SPV are connected or integrated in the main distributor HVT. Furthermore, the telecommunications network to analog or digital subscriber devices FeAP, TE, which via a subscriber line circuit TAE or via a subscriber modem DSLM and Splitter SPT or via a network termination NTBA and the subscriber lines AL _analog , AL _xDSL , AL _ISDN with the main distributor HVT in connection.

This in 1 illustrated test system according to the invention has at least one (third) connectable to a test bus tester PG3, according to the invention - to migrate the test technology in a single test technique for POTS or ISDN or xDSL lines - the test access of the central measuring station MP means (third) test device PG3 is merged to the subscriber lines AL _analog , AL _xDSL , AL _ISDN and / or trunk. As a result, both a first test device PG1, which is connected directly or via a coupling field KF to the main distributor HVT, and optionally also a second test device PG2, which is connected to the access multiplexer DSLAM (as in the prior art) are omitted. Preferably, the central measuring station MP is configured as a PC, which is connected to control the test via control lines ST to the exchange VST, the access multiplexer DSLAM and the main distributor HVT. The test bus has three bus sections, with the first bus section PB I between third test device PG3 and metallic test access MTA, the second bus section PB2 between metallic test access MTA and access multiplexer DSLAM and the third bus section PB3 between metallic test access MTA and exchange VST.

At the in 3 illustrated second alternative, the metallic test access MTA in the tester PG3 is arranged. For the migration of the test technology into a uniform test technique for POTS or ISDN or xDSL lines, the test access of the central measuring station MP is also combined by means of the test device PG3 to the subscriber lines AL _analog , AL _xDSL , AL _ISDN and / or connection line. The test bus then has two bus sections, wherein the first bus section PB2 'between metallic test access MTA and access multiplexer DSLAM and the second bus section PB3' again between metallic test access MTA and exchange VST is performed.

The Inventive test system or guaranteed procedure a simple, functional, cost-saving and therefore optimal Usability and significantly reduces the cost of migration the testing technology for POTS and ISDN lines in a uniform testing technique for POTS, ISDN and xDSL lines including prequalification. there the bus portions PB2 and PB3 are applied to the bus portion PB1 of the test bus using the switching elements of the metallic test access Merged MTA, i.e. the test buses the exchange and the DSLAMs are on the switching network returned to the main distributor. This has the advantage that the tester also on can access such lines that are not routed through the switching matrix. From the point of view of the network operator, this represents a considerable economic benefit Advantage, or makes the introduction A coupling field technology at the main distributor even possible.

Claims (7)

Test system for centrally carrying out tests of subscriber lines (AL _analogue , AL _xDSL , AL _ISDN ) and / or connection lines in a telecommunication network with a main distributor (HVT) connected to an exchange (VST), whereby an access multiplexer (DSLAM) is sent to the main distributor (HVT) and / or a splitter (SPV) connected or integrated in the main distribution (HVT), and with analog or digital subscriber equipment (FeAP, TE), which via a subscriber line circuit (TAE) or a subscriber modem (DSLM) and splitter (SPT) or a Network termination (NTBA) and the subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) are connected to the main distributor (HVT) and looped through, which comprises: • at least one central measuring station (MP), • at least one in or on the main distributor (HVT) arranged metallic test access (MTA), • at least one via a main distributor (HVT) guided test bus (PB1, P B2, PB3) connectable tester (PG3), wherein the test bus (PB1, PB2, PB3) has three bus sections and the first bus section (PB1) between tester (PG3) and metallic test access (MTA), the second bus section (PB2) between metallic Test access (MTA) and access multiplexer (DSLAM) and the third bus section (PB3) between metallic test access (MTA) and switching center (VST) is performed, such that the migration of the test technology in a uniform testing technique for POTS or ISDN or xDSL Lines of the test access of the central measuring station (MP) by means of testing device (PG3) on the subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) and / or connecting line is merged by the second and third bus sections (PB2 and PB3) on the first bus section ( PB 1) of the test bus are merged using the switching elements of the metallic test access (MTA). Test system for centrally carrying out tests of subscriber lines (AL _analogue , AL _xDSL , AL _ISDN ) and / or connection lines in a telecommunication network with a main distributor (HVT) connected to an exchange (VST), whereby an access multiplexer (DSLAM) is sent to the main distributor (HVT) and / or a splitter (SPV) connected or in the main distributor (HVT) integrated and with analog or digital subscriber equipment (FeAP, TE), which via a subscriber line circuit (TAE) or a subscriber modem (DSLM) and splitter (SPT) or a network termination (NTBA) and the subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) are connected to the main distributor (HVT) and looped through, which comprises: • at least one central measuring station (MP), • at least one metallic test access (MTA) arranged in the test device (PG3) and • at least one to a test bus (PB2 ', PB3 ') communicating with the main distributor (HVT) and having two bus sections, the first bus section (PB2') between metallic test access (MTA) and access multiplexer (DSLAM) and the second bus section (PB3 ') between metallic test access (MTA) and switching center (VST), connectable test device (PG3), such that the migration of the test technology into a single test technique f r POTS or ISDN or xDSL lines of the test access _(analog AL, AL _xDSL, AL _ISDN) of the central measuring station (MP) by means of the tester (PG3) to the subscriber lines and / or connecting line is joined by the first and second bus sections (PB2 'and PB3') to the switching elements of the metallic test access (MTA) of the tester (PG3) are merged. Test System according to claim 1 or 2, characterized in that the central Measuring station (MP) is designed as a PC and that this to control the Check via control lines (ST) to the central office (VST), the access multiplexer (DSLAM) and the metallic test access (MTA). Method for carrying out tests of subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) and / or connection lines in a telecommunication network by means of a test system according to claim 1. Method for carrying out tests of subscriber lines (AL _analog , AL _xDSL , AL _ISDN ) and / or connection lines in a telecommunication network by means of a test system according to claim 2. Method according to claim 4 or 5, characterized that the central measuring station (MP) is designed as a PC and that which control the testing process provided commands on an output unit of the measuring station (MP) displayed, selected by means of an input unit of the measuring station (MP) and via a Network or switched connections to the respective test device (PG3) transmitted become. Method according to claim 4 or 5, characterized that the control of the testing process secured against unauthorized access and that the expiration of the review process at the respective test device (PG3) is logged in the central measuring station (MP).