DE60126274D1 - Dynamische dienstqualität überwachung - Google Patents

Dynamische dienstqualität überwachung

Info

Publication number
DE60126274D1
DE60126274D1 DE60126274T DE60126274T DE60126274D1 DE 60126274 D1 DE60126274 D1 DE 60126274D1 DE 60126274 T DE60126274 T DE 60126274T DE 60126274 T DE60126274 T DE 60126274T DE 60126274 D1 DE60126274 D1 DE 60126274D1
Authority
DE
Germany
Prior art keywords
estimated
subjective quality
service quality
quality monitoring
dynamic service
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE60126274T
Other languages
English (en)
Other versions
DE60126274T2 (de
Inventor
D Clark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telchemy Inc
Original Assignee
Telchemy Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telchemy Inc filed Critical Telchemy Inc
Application granted granted Critical
Publication of DE60126274D1 publication Critical patent/DE60126274D1/de
Publication of DE60126274T2 publication Critical patent/DE60126274T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/14—Network analysis or design
    • H04L41/147—Network analysis or design for predicting network behaviour
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5061—Network service management, e.g. ensuring proper service fulfilment according to agreements characterised by the interaction between service providers and their network customers, e.g. customer relationship management
    • H04L41/5067—Customer-centric QoS measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/508—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement
    • H04L41/5087—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement wherein the managed service relates to voice services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/508—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement
    • H04L41/509—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement wherein the managed service relates to media content delivery, e.g. audio, video or TV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H04L43/087—Jitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/16—Threshold monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Telephonic Communication Services (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Closed-Circuit Television Systems (AREA)
DE60126274T 2000-05-19 2001-04-11 Dynamische dienstqualität überwachung Expired - Lifetime DE60126274T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US574472 1995-12-19
US09/574,472 US7075981B1 (en) 2000-05-19 2000-05-19 Dynamic quality of service monitor
PCT/US2001/040498 WO2001091343A2 (en) 2000-05-19 2001-04-11 Dynamic quality of service monitor

Publications (2)

Publication Number Publication Date
DE60126274D1 true DE60126274D1 (de) 2007-03-15
DE60126274T2 DE60126274T2 (de) 2007-11-08

Family

ID=24296276

Family Applications (1)

Application Number Title Priority Date Filing Date
DE60126274T Expired - Lifetime DE60126274T2 (de) 2000-05-19 2001-04-11 Dynamische dienstqualität überwachung

Country Status (6)

Country Link
US (2) US7075981B1 (de)
EP (1) EP1287708B1 (de)
AT (1) ATE352952T1 (de)
AU (1) AU2001263499A1 (de)
DE (1) DE60126274T2 (de)
WO (1) WO2001091343A2 (de)

Families Citing this family (69)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7653002B2 (en) * 1998-12-24 2010-01-26 Verizon Business Global Llc Real time monitoring of perceived quality of packet voice transmission
US7099282B1 (en) * 1998-12-24 2006-08-29 Mci, Inc. Determining the effects of new types of impairments on perceived quality of a voice service
US7075981B1 (en) * 2000-05-19 2006-07-11 Telchemy, Incorporated Dynamic quality of service monitor
US8543681B2 (en) * 2001-10-15 2013-09-24 Volli Polymer Gmbh Llc Network topology discovery systems and methods
US8868715B2 (en) * 2001-10-15 2014-10-21 Volli Polymer Gmbh Llc Report generation and visualization systems and methods and their use in testing frameworks for determining suitability of a network for target applications
US20030115320A1 (en) * 2001-12-19 2003-06-19 Yarroll Lamonte H.P. Method for tuning voice playback ratio to optimize call quality
US7408884B2 (en) * 2003-03-26 2008-08-05 Agilent Technologies, Inc. Methods and devices for correlating audio sample comparisons and network performance statistics
US7430179B2 (en) * 2003-06-28 2008-09-30 Geopacket Corporation Quality determination for packetized information
US7664122B1 (en) * 2003-07-03 2010-02-16 At&T Corp. Call tracking using voice quality measurement probe
US8140980B2 (en) 2003-08-05 2012-03-20 Verizon Business Global Llc Method and system for providing conferencing services
AU2006209834A1 (en) * 2005-02-04 2006-08-10 Apparent Networks, Inc. Method and apparatus for evaluation of service quality of a real time application operating over a packet-based network
US8059634B1 (en) * 2005-04-27 2011-11-15 Sprint Communications Company L.P. Method, system, and apparatus for estimating voice quality in a voice over packet network
US8107540B2 (en) * 2005-07-11 2012-01-31 Cheetah Technologies, L.P. Image complexity computation in packet based video broadcast systems
DE102005040301A1 (de) * 2005-08-25 2007-03-01 Deutsche Telekom Ag Verfahren zur automatischen objektiven technischen Qualitätsbewertung des Inhalts von Audio- und/oder Video-Material und zur Herausfilterung qualitätskritischer Sequenzen aus diesem Material
US20070263775A1 (en) * 2005-12-22 2007-11-15 Clark Alan D Distributed system and method for diagnosing network problems
CA2651061C (en) 2006-05-05 2014-07-08 Mariner Partners, Inc. Transient video anomaly analysis and reporting system
US8477614B2 (en) 2006-06-30 2013-07-02 Centurylink Intellectual Property Llc System and method for routing calls if potential call paths are impaired or congested
US8488447B2 (en) 2006-06-30 2013-07-16 Centurylink Intellectual Property Llc System and method for adjusting code speed in a transmission path during call set-up due to reduced transmission performance
US8289965B2 (en) 2006-10-19 2012-10-16 Embarq Holdings Company, Llc System and method for establishing a communications session with an end-user based on the state of a network connection
US8717911B2 (en) 2006-06-30 2014-05-06 Centurylink Intellectual Property Llc System and method for collecting network performance information
US9094257B2 (en) 2006-06-30 2015-07-28 Centurylink Intellectual Property Llc System and method for selecting a content delivery network
US7756136B2 (en) * 2006-07-10 2010-07-13 Cheetah Technologies, L.P. Spatial and temporal loss determination in packet based video broadcast system in an encrypted environment
US7688754B2 (en) * 2006-08-03 2010-03-30 Acterna Llc Triple play services tester
US8619600B2 (en) 2006-08-22 2013-12-31 Centurylink Intellectual Property Llc System and method for establishing calls over a call path having best path metrics
US8224255B2 (en) 2006-08-22 2012-07-17 Embarq Holdings Company, Llc System and method for managing radio frequency windows
US8015294B2 (en) 2006-08-22 2011-09-06 Embarq Holdings Company, LP Pin-hole firewall for communicating data packets on a packet network
US8274905B2 (en) 2006-08-22 2012-09-25 Embarq Holdings Company, Llc System and method for displaying a graph representative of network performance over a time period
US8189468B2 (en) 2006-10-25 2012-05-29 Embarq Holdings, Company, LLC System and method for regulating messages between networks
US8102770B2 (en) * 2006-08-22 2012-01-24 Embarq Holdings Company, LP System and method for monitoring and optimizing network performance with vector performance tables and engines
US8144587B2 (en) 2006-08-22 2012-03-27 Embarq Holdings Company, Llc System and method for load balancing network resources using a connection admission control engine
US8130793B2 (en) 2006-08-22 2012-03-06 Embarq Holdings Company, Llc System and method for enabling reciprocal billing for different types of communications over a packet network
US8743703B2 (en) 2006-08-22 2014-06-03 Centurylink Intellectual Property Llc System and method for tracking application resource usage
US8064391B2 (en) 2006-08-22 2011-11-22 Embarq Holdings Company, Llc System and method for monitoring and optimizing network performance to a wireless device
US8407765B2 (en) 2006-08-22 2013-03-26 Centurylink Intellectual Property Llc System and method for restricting access to network performance information tables
US8549405B2 (en) 2006-08-22 2013-10-01 Centurylink Intellectual Property Llc System and method for displaying a graphical representation of a network to identify nodes and node segments on the network that are not operating normally
US8223655B2 (en) 2006-08-22 2012-07-17 Embarq Holdings Company, Llc System and method for provisioning resources of a packet network based on collected network performance information
US8537695B2 (en) 2006-08-22 2013-09-17 Centurylink Intellectual Property Llc System and method for establishing a call being received by a trunk on a packet network
US8228791B2 (en) 2006-08-22 2012-07-24 Embarq Holdings Company, Llc System and method for routing communications between packet networks based on intercarrier agreements
US7843831B2 (en) 2006-08-22 2010-11-30 Embarq Holdings Company Llc System and method for routing data on a packet network
US8750158B2 (en) 2006-08-22 2014-06-10 Centurylink Intellectual Property Llc System and method for differentiated billing
US8238253B2 (en) 2006-08-22 2012-08-07 Embarq Holdings Company, Llc System and method for monitoring interlayer devices and optimizing network performance
US8199653B2 (en) 2006-08-22 2012-06-12 Embarq Holdings Company, Llc System and method for communicating network performance information over a packet network
US8307065B2 (en) 2006-08-22 2012-11-06 Centurylink Intellectual Property Llc System and method for remotely controlling network operators
US8576722B2 (en) 2006-08-22 2013-11-05 Centurylink Intellectual Property Llc System and method for modifying connectivity fault management packets
US7684332B2 (en) 2006-08-22 2010-03-23 Embarq Holdings Company, Llc System and method for adjusting the window size of a TCP packet through network elements
US8531954B2 (en) 2006-08-22 2013-09-10 Centurylink Intellectual Property Llc System and method for handling reservation requests with a connection admission control engine
US9479341B2 (en) 2006-08-22 2016-10-25 Centurylink Intellectual Property Llc System and method for initiating diagnostics on a packet network node
US9088589B2 (en) * 2006-09-27 2015-07-21 Avaya Inc. Bidirectional user notification system for media quality control
EP1995978B1 (de) * 2007-05-25 2010-07-07 Psytechnics Ltd Videoqualitätsbestimmung
EP2206303B1 (de) * 2007-07-16 2013-03-06 Telchemy, Incorporated Verfahren und system zur publikumsqualitätsschätzung von paketvideoströmen
US8559320B2 (en) * 2008-03-19 2013-10-15 Avaya Inc. Method and apparatus for measuring voice quality on a VoIP network
US8068425B2 (en) 2008-04-09 2011-11-29 Embarq Holdings Company, Llc System and method for using network performance information to determine improved measures of path states
US8125918B2 (en) * 2008-12-10 2012-02-28 At&T Intellectual Property I, L.P. Method and apparatus for evaluating adaptive jitter buffer performance
US10033618B1 (en) 2009-07-01 2018-07-24 Spirent Communications, Inc. Systems and methods for evaluating customer premises networks
US8146125B2 (en) * 2009-07-01 2012-03-27 Spirent Communications, Inc Computerized device and method for analyzing signals in a multimedia over coax alliance (MOCA) network and similar TDM / encrypted networks
US8239904B2 (en) * 2009-10-29 2012-08-07 Ixia Video path confirmation
US8423863B2 (en) * 2009-11-06 2013-04-16 Electronics And Telecommunications Research Institute Terminal transmission apparatus for providing multimedia service via satellite communication link and method for providing multimedia service using the same
EP2388947A1 (de) * 2010-05-20 2011-11-23 Thomson Licensing Verfahren zur Bestimmung der Übertragungsqualität einer Kommunikationsverbindung sowie zugehörige Vorrichtung
US9300562B2 (en) 2012-08-20 2016-03-29 Viavi Solutions Inc. Validating network traffic policy
US20150146012A1 (en) * 2013-11-27 2015-05-28 Sprint Communications Company L.P. Video presentation quality display in a wireless communication device
US9374417B1 (en) * 2014-05-27 2016-06-21 Amazon Technologies, Inc. Dynamic specification auditing for a distributed system
JP6689208B2 (ja) 2014-06-06 2020-04-28 シーティーエス・コーポレーションＣｔｓ Ｃｏｒｐｏｒａｔｉｏｎ 無線周波数状態変化測定システム及び方法
WO2015188188A1 (en) * 2014-06-06 2015-12-10 Filter Sensing Technologies, Inc. Radio frequency process sensing, control, and diagnostics network
US11258679B2 (en) 2015-07-28 2022-02-22 Spirent Communications, Inc. Systems and methods for automated testing of MoCA networks
US10382314B2 (en) 2016-03-11 2019-08-13 Spirent Communications, Inc. Systems and methods for automated testing of MoCA networks
US10129102B2 (en) 2016-05-11 2018-11-13 Spirent Communications, Inc. Service based testing
US9749686B2 (en) 2015-09-21 2017-08-29 Sling Media Pvt Ltd. Video analyzer
US9693063B2 (en) * 2015-09-21 2017-06-27 Sling Media Pvt Ltd. Video analyzer
US9917952B2 (en) 2016-03-31 2018-03-13 Dolby Laboratories Licensing Corporation Evaluation of perceptual delay impact on conversation in teleconferencing system

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381546A (en) 1979-03-02 1983-04-26 Paradyne Corporation System for the quantitative measurement of impairments in the communication channel of a quadrature amplitude modulation data communication system
US4663748A (en) * 1984-04-12 1987-05-05 Unisearch Limited Local area network
US5381404A (en) 1992-07-14 1995-01-10 Mita Industrial Co., Ltd. Packet-switching communication network and method of design
US5446492A (en) * 1993-01-19 1995-08-29 Wolf; Stephen Perception-based video quality measurement system
DE69430841T2 (de) * 1994-06-13 2002-10-02 Agilent Technologies Inc Verfahren und Vorrichtung zum Bestimmen der Netzwerkverzögerungen
US5710791A (en) 1994-10-27 1998-01-20 Northern Telecom Limited Methods and apparatus for predicting voice quality in AMPS cellular radio systems
US5598431A (en) * 1994-12-23 1997-01-28 Motorola, Inc. Method and apparatus for signal quality detection in a communication system
CA2148340C (en) 1995-05-01 2004-12-07 Gianni Di Pietro Method and apparatus for automatically and reproducibly rating the transmission quality of a speech transmission system
US5654989A (en) * 1995-11-03 1997-08-05 Motorola, Inc. Method and apparatus for symbol timing tracking
US5768527A (en) 1996-04-23 1998-06-16 Motorola, Inc. Device, system and method of real-time multimedia streaming
FI105431B (fi) * 1996-10-09 2000-08-15 Nokia Networks Oy Menetelmä päätelaitteen nopeuden määrittämiseksi ja vastaanotin
US5961599A (en) 1996-10-15 1999-10-05 Lucent Technologies Inc. Apparatus and method for computing the processing delay of adaptive applications network terminals and applications thereof
WO1998053589A1 (en) * 1997-05-16 1998-11-26 British Telecommunications Public Limited Company Testing telecommunications equipment
US6665271B1 (en) 1998-03-17 2003-12-16 Transnexus, Llc System for real-time prediction of quality for internet-based multimedia communications
US6542462B1 (en) * 1998-05-27 2003-04-01 Lucent Technologies Inc. Method and apparatus for overload control of multimedia communications in a hybrid switching system
US6512746B1 (en) 1998-09-11 2003-01-28 Nortel Networks Limited Method and apparatus for measuring voice grade of service in an IP network
US6370120B1 (en) * 1998-12-24 2002-04-09 Mci Worldcom, Inc. Method and system for evaluating the quality of packet-switched voice signals
US7653002B2 (en) * 1998-12-24 2010-01-26 Verizon Business Global Llc Real time monitoring of perceived quality of packet voice transmission
US6515964B1 (en) 1998-12-29 2003-02-04 At&T Corp. Method and apparatus for dynamically controlling the admission of calls to a network
US6363053B1 (en) 1999-02-08 2002-03-26 3Com Corporation Method and apparatus for measurement-based conformance testing of service level agreements in networks
US6785257B1 (en) * 1999-02-24 2004-08-31 Kokusai Electric Co., Ltd. Base station
US6819924B1 (en) 1999-05-25 2004-11-16 National Semiconductor Corporation Universal quality measurement system for multimedia and other signals
US7075981B1 (en) * 2000-05-19 2006-07-11 Telchemy, Incorporated Dynamic quality of service monitor
US6741569B1 (en) * 2000-04-18 2004-05-25 Telchemy, Incorporated Quality of service monitor for multimedia communications system
US20020183059A1 (en) * 2002-06-08 2002-12-05 Noreen Gary Keith Interactive system and method for use with broadcast media

Also Published As

Publication number Publication date
WO2001091343A3 (en) 2002-05-30
AU2001263499A1 (en) 2001-12-03
US7075981B1 (en) 2006-07-11
US20070140134A1 (en) 2007-06-21
WO2001091343A2 (en) 2001-11-29
EP1287708A2 (de) 2003-03-05
ATE352952T1 (de) 2007-02-15
DE60126274T2 (de) 2007-11-08
EP1287708B1 (de) 2007-01-24
US7869377B2 (en) 2011-01-11

Similar Documents

Publication Publication Date Title
DE60126274D1 (de) Dynamische dienstqualität überwachung
FI20002891A (fi) Sijainnin arviointi langattomissa tietoliikenneverkoissa
ATE393514T1 (de) Drahtloses kommunikationssystem mit erkennung von fremdstrahlungsquellen
NO20035020L (no) Kanalkvalitetsmålinger for nedlinjeressurstildeling
DE60136347D1 (de) Überwachungseinheit für die dienstqualität eines multimedia kommunikationssystems
AU2001250844A1 (en) Apparatus for and method of assessing, monitoring, and reporting on behavioral health disorders
AR051643A1 (es) Operaciones multiples de banda de frecuencia en redes inalambricas
DE69927772D1 (de) Empfänger für Reifendrucküberwacher
HK1095446A1 (en) Quality determination for a wireless communications link
DE602006019833D1 (de) Messung und überwachung der dienstqualität in dienstdifferenzierten drahtlosen netzwerken
NO993914D0 (no) Fremgangsmåte for kanalallokering
ATE409376T1 (de) Überwachungseinheit zur überwachung der dienstqualität
BR0309580A (pt) Método e aparelho para reduzir o monitoramento no modo comprimido no enlace ascendente em um dispositivo de comunicação
WO2002030042A3 (en) Monitoring quality of service in packet-based communications
WO2008114134A3 (en) Adaptive modulation in a wireless network
WO1998029961A3 (en) A cellular radio system and a method for measuring the interference level
ATE377871T1 (de) Passives optisches netzwerk und dessen überwachungsverfahren
ES2123957T3 (es) Procedimiento para detectar interacciones de servicios de redes inteligentes.
ES2199044A1 (es) Sistema de supervision de ruido.
ATE369651T1 (de) Verfahren zur überwachung eines hochspannungsnetzes
FI20012335A (fi) Spektrierottelevaan mittaukseen perustuva laadun- ja kunnonvalvonta
ATE477686T1 (de) Erzeuger von akustischen signalen für personen mit tinnitusstörungen
CA2498441A1 (en) Methods and apparatus for detecting a faulty component location along an optical path in an optical network
EE200000420A (et) Meetod ja seade kanali parameetrite jälgimiseks
TW200509727A (en) High fidelity hearing restoration

Legal Events

Date Code Title Description
8364 No opposition during term of opposition