DE102004027043A1 - Service e.g. asymmetric digital subscriber line service, provision testing device for use over telecommunication network, has display device connected with program controlled control unit for program and/or operating status indication - Google Patents

Abstract

The device has a digital subscriber line (xDSL) - chipset (CH) that is arranged in a casing with a program controlled control unit or control logic (DSP). A display device (A) is connected with the control unit for program and/or operating status indication and an input device (U) is provided for program and/or operating control. A battery or a rechargeable battery is provided for power supply of the device. An independent claim is also included for a procedure for local testing of provision of service in a telecommunication network.

Description

The The invention primarily relates to a testing device for checking a proper provision of services in a telecommunication network (claim 1). Furthermore, the invention relates to a method for decentralized implementation of exams therefor (Claim 6).

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 in the range from about 300 Hz to 3400 Hz is provided (POTS: plain old telephone service). To a maximum to transmission security to ensure, is becoming increasingly the existing analogue transmission technology the digital transmission technology replaced. In this case, for example, for a DSL transmission method (digital subscriber line), using a crossover, for example a splitter matrix, language and data usually by passive Low-pass or high-pass filter separated and on the telephone cable given. The voice connections go to a classic exchange called PSTN (public switched telephone network), and the data goes after the splitter on 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 network and computer data network 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 understood that high-bandwidth both POTS or ISDN (Integrated Services Digital Network) 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, with about 800 kbps), in the Direction from the network to the user (downstream), however, relatively high rate (for example, up to about 8 Mbit / s) takes place. In addition to the ADSL technology Other DSL techniques are common, such as 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 application case are optimized and under the generic term xDSL transmission technology be summarized.

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. The use of a maintenance technician, who performs the test on site, is complex and also requires a relatively long period of time for error detection and troubleshooting. This contradicts the requirement to quickly resolve errors that occur in a telecommunications network in order to minimize the damage caused thereby. In addition, the maintenance technician must carry special test equipment. The technician is limited in terms of number, size and weight of the required equipment due to its properties located in person. For the reasons mentioned, test functions for testing the subscriber lines or the lines between the exchanges are therefore usually integrated in the exchanges in the telecommunications network. For example, is from the DE 101 40 545 A1 a test adapter for testing a telephone connection with additional ADSL devices is known, which 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 without interrupting the telephone connection testing the ADSL Access of the switching device can be done. 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, it is already known before beginning 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 the respective subscriber line characterizing parameters (line length, terminating impedance, position of bridge taps, etc.) determine (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). In order to determine the line characteristic (s) between a local loop modem and a subscriber modem with a relatively high selectivity is out of the DE 101 54 937 C1 a device arranged in the local exchange, which is so configured; that it can cause the output of a test signal on the line, and determines the line characteristic or the line characteristics from the echo signal received via the line. For this purpose, the device has a signal processing device to which the untransformed echo signal or an untransformed signal derived therefrom is supplied, and which processes the echo signal or the signal obtained 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.

Furthermore, for the automatic test of Internet supplementary services (Internet Supplementary Services) from the DE 199 37 746 A1 a method is known in which a long-term test of the system under load without significant personnel costs during the actual test procedure and with significantly reduced hardware use can be performed. For this purpose, the test arrangement on a modem rack with a plurality of highly integrated analog modems to which a LINUX PC and on the other hand, a plurality of telephone hardware components are connected on the one hand. As a control device of the overall configuration, a control PC is provided in which an ISTS (Integrated Signaling and Traffic Simulator) interface is implemented. The analog modems are coupled to the operating system via an additional program for the creation of additional serial ports, in particular the program "Netty" based on the "TELNET" protocol.

Similarly, centralized inspection and maintenance measures are taken at the DE 101 07 43 8 A1 known methods for determining the transmission parameters of a transmission path for high bit rate data transmission applied. In this case, 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 Leitungsmo for this purpose dul test receiver. 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 of the transmission parameters can be carried out separately for both directions (modem according to line module and vice versa) or carried out in one measurement process. In this case, only one technician, in the central office, is needed for the measurement of the transmission link. 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. However, damage repair itself can often only be carried out locally, which is why the central inspection and maintenance measures offer advantages only insofar as the maintenance technician can be provided with an analysis of the error that is generated from the data available at the exchange. However, for quality assurance, performing additional checks is often necessary.

A combination of centrally running test processes and the ability to perform a test in a simple manner decentralized, is advantageous for the above reasons. This is from the DE 100 47 910 A1 a method and an arrangement for testing and maintenance of an exchange in a telecommunications network 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 a further embodiment, it 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.

A similar approach is used in a WO 02/37739 A2 or corresponding thereto EP 1 332 564 A2 known device or a method known therefrom for configuring and testing a subscriber device with a conventional modem and a DSL modem embarked. In this case, the communication connection is established via the modem in operation to the centrally arranged test site and the DSL modem is configured and tested in dialogue between the test station and arranged in the subscriber device processor with diagnostic software.

In order to enable an efficient checking of a communication connection between the main distributor and a subscriber line embodied as a _KO interface, the DE 199 47 990 A1 an attachment known, which can be inserted for the purpose of checking the communication connection by the service technician at any, arranged between the main distributor and a subscriber line interface interface in the communication link. In this case, the auxiliary device is characterized by the fact that it simulates an office-side line termination and via a So the interface enabling the connection of test equipment as well as means for activating a loop in the network termination of a Subscriber line has. The test communication connection is performed in the inserted at the Anschaltpunkt device via a unit for signal extraction and coupling and decoupled by means of this unit data signal is first fed to a converter whose downstream-side, connected to the unit for Signalaus- and -einkopplung port the specifications of a u _KO interface, while the upstream-side port is designed as an IOM interface (IOM - ISDN Oriented Modular Interface). The unit for signal extraction and coupling is, for example, a transformer with double center tap, via which the supply voltage is tapped and fed to a bridge rectifier. This ensures that the signal is always present at the network terminating device with the same polarity, regardless of the official polarity.

A similar one Way is in a known from WO 01/95598 A2 device or a known method for checking a communication connection with a remote controlled test DSL modem (RTI remote test interface) taken. Here, the communication connection is in dialogue between a test station (NOC network operations center) with an attached Loop circuit control means (loop management device) and tested the test DSL modem, which between the loop closure controller and a subscriber side Splitter can be connected.

Finally, out of the DE 100 23 891 A1 a system and method for testing a digital subscriber line, in particular an ISDN basic line and a loop device for use in such a system known, which allows a customer to easily and inexpensively check his digital subscriber line for bit errors, without a service technician must drive to the customer. The test system has a test device (loop-box) connectable to the communication network and a loop device. The loop device has a connection device for connection to a network termination device assigned to the digital subscriber line to be tested. Further, this includes a means for automatically detecting the type of digital subscriber line, such. B. a multi-device connection or a point-to-point connection. A communication controller implemented in the loop device is for accepting a connection request of the tester or for automatically initiating a connection setup to the tester and for forming a test loop in a predetermined channel of the established connection in response to a predetermined test pattern generated bit pattern. The test device can be implemented in an exchange assigned to the digital subscriber line or can be a separate test device which can be connected to the communication network and which is connected to a digital subscriber line which can be reached under a specific telephone number. The test loop can then be used to loop back and evaluate the test signals coming from the tester. The connection establishment can also be initiated by the test device itself to the ISDN basic connection to be tested. In this case, the communication controller performs all the necessary procedures for accepting the connection. By means of the loop box, a customer is thus able to have a check of his ISDN basic line carried out without him having special ISDN knowledge for operating an ISDN measuring device or ordering a service technician.

As Extensive research has revealed that in practice significant percentage of xDSL deployments failed. Frequently found Causes are e.g. a wrong wiring, a problem with the connection line, a wrong configuration of the DSLAM port, as well as a defect in the splitter or an incompatibility of the customer ADSL modems. To have an xDSL connection already at deployment to check function to be able to needed a maintenance technician a service equipment that is in the minimum equipment from a test modem, a charger, a battery pack and various Cables. With the help of this equipment, the maintenance technician switches Customer on the line and tests if the test modem synchronized with the DSLAM of the central office or not. If this connection is working properly, then usually provided by the service provider, the connection performance and therefore the deployment completed successfully.

A practical approach to verifying an ADSL deployment is based on the replication of the very first part of the so-called handshake phase according to ITU G.994.1. During the handshake phase, according to the standard, only certain ADSL carrier frequencies are active, which, in addition to the data transmission, also serve as the activation signal, ie the user modem initially sends them unmodulated as an "activation request" to the line and waits for a specific response from the DSLAM; this in turn consists of very specific ADSL carrier frequencies. For different ADSL variants (ITU G.992.1 Annex A, B, C,.,.) In each case different carrier combinations are provided. At the beginning of the test, the tester sends out corresponding carrier frequencies as an activation stimulus and evaluates the direct response from the DSLAM far away there is one.

As the above assessment of the prior art are differently designed Method and devices for testing a digital subscriber line known in a telecommunications network. In the centrally running test processes is used for purposes of suppression, Commissioning or maintenance of analog or ISDN lines in usually the test bus used by the respective exchange. In case of interference will then determined by the exchange from the section to the area of responsibility the user in order or disturbed is. This basically results Problems, because the interface to the user is not reactive is, 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.

The Decentralized audits described above assume that on-site at least one end of the line to be tested access is possible. Furthermore, the service equipment commonly used by maintenance technicians is in Terms of dimensions and weight as unwieldy to call and needed a time-consuming wiring. Another problem is that equipment consists of several parts, e.g. will be an extra charger and battery pack for a network-independent use needed. Also the applied in practice approach (evaluation of the answer on an activation signal) is also not without weaknesses. The test result is based on that fact exclusively on the evaluation of the very first phase of ADSL initialization. For example, should a successful synchronization occur despite an initial one Answer of the DSLAM can not come about, the tester does not notice this, but instead reports success, such a scenario is quite realistic, since e.g. recurrent CRC errors during data transmission while could occur during initialization for example due to excessive line attenuation. It would come in this Case constantly to restart the synchronization without it ever being successful would be completed. A Another weakness of this method is also in the following fact: A random on a neighboring double wire ADSL handshake procedure, the interspersed by the crosstalk examined, could be considered positive response to the activation incentive. In But reality is, for example, an incorrect connection of the examined Lead to the DSLAM before, nevertheless the test runs in this case successful.

Therefore lacks in practice a handy device, which the service technician in the field To help make a provided ADSL connection fast and straightforward to test. 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.

Of the Invention is opposite the known devices and methods for performing exams the subscriber lines in a telecommunications network the task is based on a device for testing a proper provision of services available to deliver.

• 1. als gesondertes Gerät ausgebildet ist, das zwischen Teilnehmereinrichtung und Vermittliungsstelle anschaltbar ist und am Gehäuse angeordnete Anschlussmittel aufweist,
• 2. mindestens einen im Gehäuse angeordneten xDSL-Chipsatz mit einer programmgesteuerten Steuereinheit oder Steuerlogik aufweist,
• 3. mindestens ein mit der Steuereinheit verbundenes Anzeigemittel zur Programm- und/oder Betriebszustandsanzeige und mindestens ein Eingabemittel zur Programm- und/oder Betriebssteuerung aufweist und
• 4. Batterien oder wiederaufladbare Batterien zur Stromversorgung des Geräts aufweist.

This object is, according to claim 1, in a tester for decentralized testing of a proper provision of services in a telecommunications network with subscriber lines, connected to an exchange main distributor, to the main distributor an access multiplexer and / or a splitter are connected or integrated in the main distributor, and with analog and digital subscriber devices which are connected via a subscriber line circuit or a subscriber modem and splitter or a network termination and the subscriber lines to the main distributor, which:

• 1. is designed as a separate device which can be connected between the subscriber device and the switching center and has connection means arranged on the housing,
• 2. has at least one xDSL chip set arranged in the housing with a program-controlled control unit or control logic,
• 3. at least one connected to the control unit display means for program and / or operating status display and at least one input means for program and / or operation control, and
• 4. Have batteries or rechargeable batteries to power the device.

The testing device according to the invention has the advantage that a commissioning, service and interference suppression of xDSL lines is made possible in a cost-effective manner. The possible places of use / connection points of the test device include the main distributor, the cable divider, the TAE socket at the customer's site and the modem connection on the customer's splitter. The handy tester helps the service technician quickly and easily test a provided xDSL connection, such as an ADSL connection, by using the tester as a reference user side modem attempts to successfully synchronize with the appropriate DSLAM port in the central office. Also in the switching center or device, the test device according to the invention provides an improved test option for quick fault isolation. The use of modem chips in a data communication network is from the G 91 08 235.8 known.

Farther This object is achieved in a Method for decentralized testing a proper provision of services in a telecommunication network, for a test apparatus according to claim 1, according to claim 6 solved, at disconnected the subscriber line and connected the tester is monitored and by means of the control unit, the connection of the xDSL chipset and possibly restarting the synchronization initiated becomes.

The inventive method allows In a simple way, the cost-effective testing of the provision of Services in a telecommunications network. The connection of the tester can doing this at any location of the communication link, for this the exam no additional Splitter needed becomes. The crossover can be omitted, as the service technician before connecting the device disconnected the line to the customer, and thus during the follow-up exam no other transmission signals (such as ISDN) than that from the tester to the central office walk. In the exchange, in turn, is a splitter in the DSLAM present, so that at the receiving end also no other signals disturb the communication in the ADSL band.

at a preferred embodiment of the invention is, according to claim 2, by means of a switch in the wires of the subscriber line a detection circuit connected to a display means stands, einschleifbar.

In Further education has, according to claim 3, the detection circuit a series resistor and a downstream of this bridge circuit on, whereby a remote supply voltage regardless of the Anklemmrichtung can be detected and displayed.

If when connecting the trunk to the DSLAM only one of the two Cores (a or b) has been correctly launched to the customer, then exists the possibility, that the xDSL chipset, for example for ADSL, in the tester at otherwise Great Conditions (such as low line loss) are nevertheless synchronized and thus a proper provision signaled, although this is not given. This source of error becomes in the supply test according to the invention reliably excluded.

In Further development of the invention is, according to claim 4, in addition to a Interface circuit for external connection of a PC or as portable computer designed test / measurement space provided.

These Development of the invention has the advantages that the service technician on-site at any time the available standing processes for examination and maintenance, which by selecting a menu item on the display of the test station can be started. Across from A simple display by means of LEDs on the tester itself can be extended to a PC Diagnostic information, such as line attenuation, SNR values, bit allocation, etc. By supplementing the displayed command with additional data can for example be a test order for one Call number assigned subscriber connection requested in a simple manner become. If necessary, you can so also changed data Be the exam and maintain an exchange. Thereby stands a particularly powerful Procedure for introduction new features or to change existing functions available, because the changes decentralized and on-site the impact can be reliably verified. Still lies that with the exam and maintenance entrusted service technicians immediately after End of a test that Result before. Based on this quickly made further decisions, or more Test orders transmitted become.

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 tester according to the invention,

2 the possible places of use / connection points of the test device in a telecommunication system and

3 in detail an embodiment of a detection circuit.

The introduction of xDSL techniques creates additional metrological requirements in the field of pre-qualification of existing analog lines or ISDN lines for xDSL services as well as metrological requirements regarding the maintenance and suppression of already operating xDSL lines. These new requirements are solved differently by the individual network operators. In the area of pre-qualification of the lines, metrological procedures as well as data-technical approaches (line databases) are pursued. The mainte- nance and debugging of 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.

2 shows the possible places of use / connection points (dotted line) of the test device PG according to the invention in a telecommunication system. The telecommunication network has a main distributor HVT connected to an exchange VST, wherein an access multiplexer DSLAM and / or a splitter SPV are connected to the main distributor HVT or are integrated in the main distributor HVT. Furthermore, the telecommunication network has analog or digital subscriber devices TE, which are connected to the main distributor HVT via a subscriber line circuit (not shown) or via a subscriber modem DSLM and splitter SPT or via a network termination NTBA and the subscriber line AL. As 2 shows, the possible locations / connection points of the tester PG in the field of subscriber line AL, among others, the main distributor HVT, the KVZ cable divider, the connection point line APL (transfer point of the telecommunications network to the customer), the TAE box at the customer and the modem connection on the customer's splitter SPT.

This in 1 illustrated test device PG according to the invention is designed as a separate device, which is switchable, for example, locally between the subscriber device TE and the subscriber line AL and arranged on the housing connecting means FE. Furthermore, an xDSL chip set CH is arranged in the housing, which has a program-controlled control unit or control logic DSP. To the control unit DSP display means A, preferably LED, for operating status display and input means for program and / or operation control, for example, for switching by means of switch U, connected. Finally, a power supply SV, for example with batteries or rechargeable batteries, provided for the tester PG, whereby a network-independent use is ensured. If required, the rechargeable batteries can be charged directly in the PG tester via a 12V adapter (eg in a car) by means of a correspondingly integrated charging circuit. A display means A, for example, a "low battery" - LED on the tester PG instructs the service technician on a low battery level of the battery.

• • LED leuchtet nicht: Keine Verbindung möglich oder DSLAM antwortet nicht.
• • LED blinkt: Verbindungsaufbau im Gange (Initialisierung nach ITU G.994.1 und G.992.1).
• • LED leuchtet dauerhaft: „Showtime" läuft, d.h. Synchronisation war erfolgreich, ATM-Schicht ist aufgebaut.

The detection of a successful synchronization can take place in the test device PG according to the invention, for example, via an LED as the display means A, which indicates the current connection status via three possible states:

• • LED does not light up: No connection possible or DSLAM does not answer.
• • LED flashes: Connection is in progress (initialization according to ITU G.994.1 and G.992.1).
• • LED lights up permanently: "Showtime" is running, ie synchronization was successful, ATM layer is established.

optional the test device PG according to the invention additionally has a Interface circuit / interface USB (Ethernet or USB), via which the service technician with a portable computer (notebook) as Testing / measuring station MP received further diagnostic information on the examined connection can, for example Line loss, SNR values, bit allocation, and the maximum possible data rate in up and down Downstream. This information could be one on the notebook installed software from the registers of the xDSL chipset CH, for example, an ADSL chipset, read. It should be noted, however, that the above data are only available. when the synchronization and thus the test was successful.

When more option can also another software on the notebook the functionality of the ADSL connection even higher Test level by trying an IP test connection with the Broadband PoP (Point of Presence), as e.g. already with the freely available "T-DSL Speedmanager "the Deutsche Telekom AG possible is.

During operation on the notebook MP, the test device PG according to the invention can also be supplied via the battery SV directly via the USB interface USB with power, so that in this Be operation mode, the rechargeable batteries SV of the tester PG are protected.

3 shows in detail a detection circuit SP, which is einschleifbar by means of a switch U in the wires a, b of the subscriber line AL and communicates with a display means A. Preferably, the detection circuit SP is configured as a circuit for detecting an existing supply voltage independently of the clamping direction of the test device PG according to the invention; However, mains and measuring currents can also be measured as measurement and diagnostic tasks. In one embodiment, a series resistor V and a downstream bridge circuit B are additionally connected between the wires a, b of the subscriber line AL, whereby a remote supply voltage can be detected independently of the Anklemmrichtung. When there is a supply voltage for POTS or ISDN, an LED is lit as a display means A, regardless of whether it is an analogue or ISDN connection. This means a corresponding dimensioning of the series resistor V, so that the LED lights in a voltage range of about 40 to 96 volts. If a voltage is present and the LED lights up, then you must be connected to both cores a, b, ie this possibility can be excluded for the deployment test as a source of error. However, this test requires that in addition to ADSL, either POTS or ISDN be provided for the port being examined, which is the rule. For example, Deutsche Telekom offers - like virtually all network operators in Germany - ADSL not as a single product, but only in conjunction with an analog or ISDN connection. However, the test for an existing supply voltage must not take place directly on or behind the splitter SPT of the user side, since the low-frequency component including DC voltage has already been filtered out.

• • Handlichkeit des Geräts in Bezug auf Größe und Gewicht, alle Funktionen sind in einem Gerät PG integriert.
• • Detektion einer vorhandenen POTS- oder ISDN-Speisespannung, um die Möglichkeit der Anschaltung nur einer Ader (a oder b) als Fehlerquelle auszuschließen.
• • Prüfung der kompletten xDSL-Initialisierung, beispielsweise ADSL-Initialisierung, bis hin zum Abschluss der Synchronisation mit dem DSLAM (Übergang zu „Showtime").
• • Netzunabhängige Stromversorgung SV über Akkus, Ladeschaltung im Gerät integriert, Anzeige eines niedrigen Ladezustands der Akkus über eine LED als Anzeigemittel A.
• • Optionale Erweiterbarkeit auf weitere ADSL-Diagnosefunktionen bei Anschluss eines Notebooks MP per USB- oder Ethernet-Interface USB.

The test device PG according to the invention or the method according to the invention has essentially the following advantages:

• • Handiness of the device in terms of size and weight, all functions are integrated in a device PG.
• • Detection of an existing POTS or ISDN supply voltage in order to exclude the possibility of connecting only one wire (a or b) as a source of error.
• • Checking the complete xDSL initialization, for example ADSL initialization, up to the completion of the synchronization with the DSLAM (transition to "Showtime").
• • Mains-independent power supply SV via rechargeable batteries, charging circuit integrated in the device, display of a low charge state of the rechargeable batteries via an LED as display means A.
• • Optional expandability to further ADSL diagnostic functions when connecting a notebook MP via USB or Ethernet interface USB.

Thereby is available to all telecommunications network operators who provide their customers with ADSL, for example offer as a broadband service, a cost-effective and easy-to-use Tester PG for available with which ensures a quick and successful deployment can be.

In Development of the invention, the preferably for the short-term, mobile set on site suitable tester PG also a remotely controllable Switch (or over USB and DSP controllable switch), creating a quasi "fixed" and from a central Point of accessible measurement technology is available. For example, the exams via PC / web server or via mobile measuring station (GSM or at higher bandwidths UMTS) be, with the network connection over the interface circuit (eg, an IP interface; also packet-switched network) can take place. By the combination of decentralized and centralized audit can be a higher overall quality standard (Quality-of-Services = QoS) can be achieved, occurring errors can be quickly resolved and a flexible "temporary" extension of the Functionality - for example to the most different transmission methods or for the Determination of line parameters z. B. to the use of time domain based Reflection metrology method or TDR method (TDR = Time Domain Reflectometry) or frequency-domain based reflection metrology method (FDR method, FDR = Frequency Domain Reflectometry) or to prequalification procedures or diagnostic procedure is enabled.

Claims (7)

Testing device (PG) for the decentralized checking of the provision of services in a telecommunication network with subscriber lines (AL), with a central distributor (HVT) connected to a central office (VST), to the main distributor (HVT) an access multiplexer (DSLAM) and / or Splitter (SPV) connected or integrated in the main distribution (HVT), and with analog and digital subscriber equipment (TE), which via a subscriber line circuit (TAE) or a subscriber modem (DSLM) and splitter (SPT) or a network termination (NTBA) and the Subscriber connection lines (AL) are in communication with the main distributor (HVT), which: 1. is designed as a separate device (PG) between the subscriber device (TE) and switch 2. at least one xDSL chip set (CH) arranged in the housing with a program-controlled control unit or control logic (DSP), 3. at least one with the control unit (VST) can be connected and arranged on the housing connecting means (FE, USB) DSP) associated display means (A) for program and / or operating status display and at least one input means (U) for program and / or operation control and 4. Batteries or rechargeable batteries for power supply (SV) of the device (PG). Tester (PG) after Claim 1, characterized in that by means of a switch (U) in the wires (a, b) of the subscriber line (AL) a Detection circuit (SP), which with a display means (A) in Connection stands, is einschleifbar. Tester (PG) after Claim 2, characterized in that the detection circuit (SP) a series resistor (V) and this downstream bridge circuit (B), whereby a remote supply voltage independent of the Anklemmrichtung can be detected and displayed. Tester (PG) after Claim 1, characterized in that additionally an interface circuit (USB) for external connection as a PC or as a portable computer designed test / measuring station (MP) is provided. Tester (PG) after Claim 1, characterized in that the display means (A) as LED are designed. Method for the decentralized check of a proper provision of services in a telecommunication network for a test device according to claim 1, characterized characterized in that the subscriber line (AL) separated and the tester (PG) connected and that by means of the control unit (DSP) the connection of the xDSL chipset (CH) monitored and if necessary, a restart of the synchronization is initiated. Method according to claims 3 and 6, characterized that in addition the presence of the remote supply voltage is checked.