WO2002067562A2 - Vorrichtung und verfahren zum charakterisieren der übertragungsparameter einer übertragungsstrecke zur hochbitratigen datenübertragung - Google Patents
Vorrichtung und verfahren zum charakterisieren der übertragungsparameter einer übertragungsstrecke zur hochbitratigen datenübertragung Download PDFInfo
- Publication number
- WO2002067562A2 WO2002067562A2 PCT/DE2002/000261 DE0200261W WO02067562A2 WO 2002067562 A2 WO2002067562 A2 WO 2002067562A2 DE 0200261 W DE0200261 W DE 0200261W WO 02067562 A2 WO02067562 A2 WO 02067562A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- modem
- line module
- test
- test signals
- transmission
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
Definitions
- the present invention relates to a line module for a switching center, a modem for high-bit data transmission for a subscriber for use with this line module and a method used in this line module and modem for characterizing the transmission parameters between the line module and the modem.
- EWSD digital digital dialing system
- POTS Piain Old Telephone Service
- ISDN Integrated Services Digital Network
- a data transmission rate of up to 8 Mbit per second and in the opposite direction (data upstream) of up to 640 kbit per second is possible.
- the interface between the subscriber and the exchange or the telecommunications network is formed by a so-called line module (also called subscriber line module, line card or SLMI, Subscriber Line Module Internet) in the exchange.
- line module also called subscriber line module, line card or SLMI, Subscriber Line Module Internet
- CPE customer premises equipment
- the data transmission takes place in different frequency ranges, each frequency range representing its own transmission channel for data transmission; the data for the telephone services are transmitted in one frequency range, the data for data transmission from the subscriber to the exchange (data upstream) in a second frequency range and the data for data transmission from the exchange to the subscriber (data downstream) in a third frequency range.
- the line modules described have an integrated voice / data chipset, with which both a transmission of
- Speech in the PCM system Pulse Code Modulation
- a voice network as well as the transmission of data (e.g. in the frame relay, Ethernet or ATM system) for packet-oriented data transmission via a data transmission network (e.g. the Internet) with high data transmission rates is possible.
- data e.g. in the frame relay, Ethernet or ATM system
- a data transmission network e.g. the Internet
- the transmission parameters such as check the amplitude frequency response of the transmit / receive interface (line transceiver) of the respective module and the subscriber line in between.
- Test transmitter and test receiver attaches and operates. In addition, only the transmission parameters of the subscriber line can be checked with this method.
- the object of the present invention is therefore to provide a method for determining the transmission parameters of a transmission link for high-bit data transmission, a line module and a modem for carrying out this method, in which a simple determination of the transmission parameters of the transmission link between modem, subscriber line and line module is made possible , the transmission parameters for further evaluation and
- This object is achieved by a method for determining the transmission parameters of a transmission link for high-bit data transmission according to appended claim 1, a line module according to appended claim 8 and a modem according to appended claim 11.
- the xDSL modem and the line module are actively involved in the measurement process, which is used to determine the parameters of the transmission link for high-bit-rate data transmission.
- the measuring process thus extends to the modem, the subscriber line and the line module.
- 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 according to the invention receives these first test signals with the aid of a modem test receiver.
- a modem evaluation device evaluates the first test signals with regard to the transmission parameters of the transmission link or the transmission channel from the line module to the modem.
- a modem protocol transmitter 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.
- the modem has a modem test transmitter for determining the transmission parameters from the modem to the line module.
- the modem test transmitter generates and sends second test signals to the line module in the exchange.
- the line module has a line module test receiver for this purpose. These test signals are evaluated with regard to the transmission parameters of the transmission link or the transmission channel from the modem to the line module by a line module evaluation device.
- the transmission parameters can be determined separately for both directions (modem to line module and vice versa) or carried out in one measurement process.
- the present invention consists in the fact that only one technician is required for the measurement of the transmission link, specifically in the exchange. The operator places a test order for the transmission path of a certain subscriber, whereupon the measurement is carried out automatically.
- the transmission parameters of the entire transmission path which includes the modem, subscriber line and line module, can be determined in one operation.
- the line module includes a communication interface which generally enables access to the line module for procedures which relate to the measuring process for determining the transmission parameters.
- This communication interface enables access to the line module evaluation device and the line module protocol receiver for reading out the evaluations of the test signals. Furthermore, these communication interfaces enable access to the line module test transmitter and the line module control transmitter for initializing and executing a test job for the modem and the line module and / or for updating measurement routines stored in the modem or line module.
- access is made manually by a technician on the basis of the transmission parameters determined qualitatively assesses the transmission link.
- the access can also be made automatically by a computer program, for example at regular intervals or when errors occur frequently.
- test routines in the modem by the line module ensures that flexible adaptation to changing requirements with regard to test types, test depth, etc. can take place.
- the transmission parameters in particular the available transmission bandwidth, are not known from the outset, it makes sense to carry out the data transmission for the test protocol with the lowest possible data transmission rate (bit rate). This ensures that data transmission can be carried out in any case, even if the subscriber line is damaged or has limited functionality with a restricted transmission bandwidth.
- a frequency range would be conceivable here, for example, which if possible at the beginning of the frequency range of the data
- Upstream transmission channel lies and roughly corresponds to the bandwidth of a voice transmission (4 kHz).
- data transmission in the frequency range in which the transmission of the telephone services normally takes place would also be conceivable, for example.
- the modem also has a modem control receiver.
- the modem control receiver receives from the line module the data that contain an initialization of the modem for a test job and / or an update of measurement routines stored in the modem. This data is processed by the modem control receiver, whereupon the respective actions (initialization or update) are stimulated in the modem.
- the first and second test signals exchanged between the line module and the modem are sine waves. signals that are tuned (varied) in a specific frequency band. In this way, the amplitude frequency response of the transmission link from the switching center (line module) to the subscriber (modem) and vice versa can be determined very easily by the respective evaluation devices.
- test signals can also be multi-tone signals that contain a specific frequency spectrum.
- test signals are spectrally evaluated by the respective evaluation devices, as a result of which the amplitude frequency response can be determined in a simple manner.
- the line module determines the transmission parameters by transmitting test signals only in one transmission direction.
- the line module generates a first test signal that covers the entire transmission range (data upstream and data downstream).
- the evaluation takes place in the modem, which sends a test protocol to the line module for further processing. This determination can also take place in the opposite direction of transmission. In this way, the test signals only have to be evaluated by one device (modem or line module).
- FIG. 2 is an illustration of the transmission link according to the present invention. The present invention is explained in more detail below with reference to FIG. 2, which shows a schematic representation of the transmission link.
- the transmission link that is considered with the present invention consists of a line module 1 in the exchange, a modem 2 (xDSL modem) at the subscriber and the subscriber line 3 for connecting the subscriber to the exchange.
- the subscriber line 3 is shown here so that it can be measured only for this line, as in the prior art, for example.
- the line module 1 includes, among other things, the line module test transmitter 11, the line module evaluation device
- the line module 1 contains a transmitting / receiving device 14, which in turn consists of the line module transmission interface 15 and the line module
- Receiving interface 16 for connecting the subscriber line 3 to the line module 1 is used for sending and receiving data.
- the modem 2 includes, among other things, the modem test transmitter 21, the modem evaluation device 22, the modem protocol transmitter 23 and the line module control receiver 27. Furthermore, the modem 2 contains a transceiver 24, which in turn originates from the modem transmission interface 25 and the modem reception interface 26 for connecting the subscriber line to the modem 2 for sending and receiving data.
- a signal generator (line module test transmitter 11) is present in the line module, which generates a signal (first test signal) whose Spectral components are in the desired frequency band for data downstream data transmission.
- the modem 2 at the subscriber is initiated by the modem control receiver 27 as a receiver for the first test signal by an initialization, which is excited via the communication interface 17 and sent to the line module control transmitter 18.
- the modem evaluation device 22 is designed as a spectrum analyzer. The modem 2 thus determines the amplitude values of the expected spectral components of the received first test signal (and thus the nodes of the data downstream amplitude frequency response).
- the spectral components are then encoded by the modem protocol transmitter 23 in a test protocol (measurement protocol) and sent to the line module 1 for further evaluation and received there by the line module protocol receiver 13.
- the test protocol is thus available via the communication interface 17 for further evaluation.
- the modem 2 is initialized as a signal generator using the initialization procedure.
- the modem test transmitter 21 sends a second test signal to the line module, which has the spectral components of the desired frequency in the data upstream.
- the line module 1 uses the line module evaluation device 12, which is also designed as a spectrum analyzer, to evaluate the amplitude values of the expected spectral components of the second test signal and thus determines the reference points of the data upstream frequency response.
- the line module evaluation device 12 which is also designed as a spectrum analyzer, to evaluate the amplitude values of the expected spectral components of the second test signal and thus determines the reference points of the data upstream frequency response.
- DSP algorithms digital signal processors
- the line module 1 and in the modem 2 enable the test signals of the respective test transmitter to be generated or the test signals received to be evaluated by the respective evaluation device (for example spectral evaluation).
- the respective measurement is initiated by a single technician in the exchange who has access to the line module 1 via the communication interface 17. This initiates a test job for a specific subscriber connection (modem 2, subscriber modem), whereupon the line module contacts the subscriber modem 2 via the test protocol and makes the necessary initializations and settings.
- modem 2 subscriber modem
- test protocol a measurement protocol transmitted to the line module 1 and are thus available to the technician in the office for further evaluation via the communication interface 17.
- test transmitter 21 In test runs in which a test transmitter on the subscriber side (modem test transmitter 21) is required, the subscriber modem takes over this task after appropriate initialization by the line module 1. The second test signal then received by the line module is evaluated and made available to the technician in a prepared form ,
- the present invention enables a particularly flexible measuring method for measuring the transmission path described.
- noise measurements and spectral measurements in freely selectable frequency or spectral ranges are possible.
- Event-controlled measurements are also conceivable if certain threshold values are exceeded.
- Such swelling values are eg. Bit errors, wherein when a certain bit error rate is exceeded by the modem 2 or the line module 1, feedback is sent to the exchange, whereupon a measurement is automatically initiated.
- data upstream can be qualified for a line over the entire data downstream bandwidth of the transmission link mentioned.
- the "method for characterizing the amplitude frequency response of an xDSL line transceiver , ⁇ ,” from Siemens AG proposed in the patent application with the application file number 100 22 710.4 is advantageously suitable for this measurement.
- test results obtained are used, for example, for the qualitative assessment of the transmission link by a technician, for example for troubleshooting and limitation, for setting predetermined parameters for the respective transmission link, etc.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Communication Control (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/432,636 US20040062378A1 (en) | 2001-02-16 | 2002-01-25 | Device and method for characterizing the transmission parameters of a transmission link for high bit rate data transmission |
EP02708161A EP1360828A2 (de) | 2001-02-16 | 2002-01-25 | Vorrichtung und verfahren zum charakterisieren der übertragungsparameter einer übertragungsstrecke zur hochbitratigen datenübertragung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10107438.7 | 2001-02-16 | ||
DE10107438A DE10107438A1 (de) | 2001-02-16 | 2001-02-16 | Vorrichtung und Verfahren zum Charakterisieren der Übertragungsparameter einer Übertragungsstrecke zur hochbitratigen Datenübertragung |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002067562A2 true WO2002067562A2 (de) | 2002-08-29 |
WO2002067562A3 WO2002067562A3 (de) | 2003-05-08 |
Family
ID=7674377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/000261 WO2002067562A2 (de) | 2001-02-16 | 2002-01-25 | Vorrichtung und verfahren zum charakterisieren der übertragungsparameter einer übertragungsstrecke zur hochbitratigen datenübertragung |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040062378A1 (de) |
EP (1) | EP1360828A2 (de) |
CN (1) | CN1529977A (de) |
DE (1) | DE10107438A1 (de) |
WO (1) | WO2002067562A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1693985A1 (de) * | 2003-12-12 | 2006-08-23 | Huawei Technologies Co., Ltd. | System und verfahren zum testen des teilnehmeranschlusses |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2004202340B2 (en) | 2003-05-27 | 2010-06-10 | Labtronix Concept Inc | Method of operating a grouped selection game |
DE102004031851B4 (de) * | 2004-06-30 | 2007-05-10 | Infineon Technologies Ag | Verfahren zum Aufbauen einer ratenadaptiven VDSL-Verbindung |
CN1870611A (zh) * | 2005-05-26 | 2006-11-29 | 华为技术有限公司 | 估算信道性能参数的方法及系统 |
Citations (3)
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WO1999014921A1 (en) * | 1997-09-15 | 1999-03-25 | Cisco Technologies, Inc. | LOOP INTEGRITY TEST DEVICE AND METHOD FOR DIGITAL SUBSCRIBER LINE (xDSL) COMMUNICATION |
WO1999039498A1 (en) * | 1998-01-29 | 1999-08-05 | Telia Ab (Publ) | Improvements in or relating to telecommunications |
WO2000038371A1 (en) * | 1998-12-18 | 2000-06-29 | Covad Communications Company | Method and system for reducing congestion in connection-oriented packet networks having digital subscriber line access |
Family Cites Families (10)
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US6389010B1 (en) * | 1995-10-05 | 2002-05-14 | Intermec Ip Corp. | Hierarchical data collection network supporting packetized voice communications among wireless terminals and telephones |
US5420516A (en) * | 1991-09-20 | 1995-05-30 | Audio Precision, Inc. | Method and apparatus for fast response and distortion measurement |
CA2118277C (en) * | 1993-12-23 | 1998-09-22 | Alexander Feiner | Facility type determination technique |
US5970088A (en) * | 1996-05-09 | 1999-10-19 | Texas Instruments Incorporated | Reverse channel next cancellation for MDSL modem pool |
US6253060B1 (en) * | 1996-12-20 | 2001-06-26 | Airnet Communications Corporation | Method and apparatus employing wireless remote loopback capability for a wireless system repeater to provide end-to-end testing without a wireline connection |
US5987320A (en) * | 1997-07-17 | 1999-11-16 | Llc, L.C.C. | Quality measurement method and apparatus for wireless communicaion networks |
US6198416B1 (en) * | 1999-04-16 | 2001-03-06 | Scott R. Velazquez | Linearity error compensator |
US6751254B1 (en) * | 1999-05-05 | 2004-06-15 | Panasonic Communications Co., Ltd. | Activation of multiple xDSL modems with power control measurement |
US6466649B1 (en) * | 1999-12-09 | 2002-10-15 | Harris Corporation | Detection of bridged taps by frequency domain reflectometry |
US7200180B2 (en) * | 1999-12-30 | 2007-04-03 | Tioga Technologies, Inc. | Data transceiver with filtering and precoding |
-
2001
- 2001-02-16 DE DE10107438A patent/DE10107438A1/de not_active Withdrawn
-
2002
- 2002-01-25 EP EP02708161A patent/EP1360828A2/de not_active Withdrawn
- 2002-01-25 US US10/432,636 patent/US20040062378A1/en not_active Abandoned
- 2002-01-25 CN CNA028050568A patent/CN1529977A/zh active Pending
- 2002-01-25 WO PCT/DE2002/000261 patent/WO2002067562A2/de not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999014921A1 (en) * | 1997-09-15 | 1999-03-25 | Cisco Technologies, Inc. | LOOP INTEGRITY TEST DEVICE AND METHOD FOR DIGITAL SUBSCRIBER LINE (xDSL) COMMUNICATION |
WO1999039498A1 (en) * | 1998-01-29 | 1999-08-05 | Telia Ab (Publ) | Improvements in or relating to telecommunications |
WO2000038371A1 (en) * | 1998-12-18 | 2000-06-29 | Covad Communications Company | Method and system for reducing congestion in connection-oriented packet networks having digital subscriber line access |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1693985A1 (de) * | 2003-12-12 | 2006-08-23 | Huawei Technologies Co., Ltd. | System und verfahren zum testen des teilnehmeranschlusses |
EP1693985A4 (de) * | 2003-12-12 | 2006-12-13 | Huawei Tech Co Ltd | System und verfahren zum testen des teilnehmeranschlusses |
US7542550B2 (en) | 2003-12-12 | 2009-06-02 | Huawei Technologies Co., Ltd. | System for testing subscriber lines and method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1360828A2 (de) | 2003-11-12 |
WO2002067562A3 (de) | 2003-05-08 |
CN1529977A (zh) | 2004-09-15 |
DE10107438A1 (de) | 2002-09-05 |
US20040062378A1 (en) | 2004-04-01 |
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