WO1998013966A1 - Consignation et analyse des evenements dans des reseaux de telecommunications - Google Patents

Consignation et analyse des evenements dans des reseaux de telecommunications Download PDF

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Publication number
WO1998013966A1
WO1998013966A1 PCT/AU1997/000643 AU9700643W WO9813966A1 WO 1998013966 A1 WO1998013966 A1 WO 1998013966A1 AU 9700643 W AU9700643 W AU 9700643W WO 9813966 A1 WO9813966 A1 WO 9813966A1
Authority
WO
WIPO (PCT)
Prior art keywords
time
event
signal code
precision
pulse
Prior art date
Application number
PCT/AU1997/000643
Other languages
English (en)
Inventor
Andrew Louis Martin
Original Assignee
Martin Communications Pty. Ltd.
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 Martin Communications Pty. Ltd. filed Critical Martin Communications Pty. Ltd.
Priority to JP10515073A priority Critical patent/JP2001501395A/ja
Priority to BR9711547-9A priority patent/BR9711547A/pt
Priority to EP97918847A priority patent/EP0965197A1/fr
Priority to CA002267254A priority patent/CA2267254A1/fr
Priority to AU42911/97A priority patent/AU716041B2/en
Publication of WO1998013966A1 publication Critical patent/WO1998013966A1/fr
Priority to NO991498A priority patent/NO991498L/no

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • 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
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0604—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time
    • H04L41/0618—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time based on the physical or logical position

Definitions

  • TECHNICAL FIELD This invention relates to event recording, monitoring and analysis in telecommunication networks, to event correlation in large and complex telecommunication systems, to event recorders for use at local stations in such networks, and to methods of event correlation therein.
  • the invention has particular application to the recording and time-sequence analysis of faults or alarms in large telecommunications networks, though it also has value in the recording and analysis of other events, such as call-traffic data, to enable the performance of a network to be assessed.
  • a large network is one in which the geographical spread of nodes or exchanges is such that the time taken for a signal to pass across the network is significantly greater than the time taken to switch signals within an exchange.
  • Modern telecommunications networks are said to be the most complex systems devised by humans. Not only are there many millions of components — switches, links, multiplexers, modems, computer and software elements — interconnected in a vast and complex manner, but the distribution of call traffic is usually under adaptive software (computer) control so that the system adapts 'intelligently' to local congestion or faults. Thus, the route taken across the network by a given call or data packet between one subscriber and another is difficult if not impossible to determine as it depends upon local instantaneous traffic and fault conditions.
  • event monitoring and analysis is vital in modern telecommunications systems: it is key to gauging and improving system efficiency: it is essential for the resolution of fault avalanches and for discerning the peculiar combination of events which contribute to a last-straw or other unexpected system failures.
  • one or more event recorders or monitors are included in each network node or exchange and each is connected to monitor many events — perhaps hundreds — occurring in that node or exchange, the time and nature of each event being automatically recorded by the monitor.
  • Each monitor may be arranged to automatically report events which it has recorded to a central system or area control centre, or it may be periodically interrogated by the control centre to 'read' or download the recorded events, in this way, well over 100,000 events may be monitored at points spread over a geographical area the size of a continent.
  • This will allow improved fault/event recording, monitoring and analysis for telecommunications networks, improved telecommunications systems and networks incorporating such fault/event recording or monitoring systems, and improved event recorders for use in telecommunications networks.
  • the present invention is based upon the realisation that radio signals from earth satellite systems, such as the GPS satellite system, can be used to ensure that clocks used to log events in a telecommunications network can be synchronised with great precision in a manner which is independent of the integrity of the network or its configuration.
  • a GPS-referenced clock having a UTC-format time- signal output which is accurate to the second, together with the use of means for generating synchronised sub-second intervals, precise universal event timing can be achieved at as many locations across a telecommunications network as desired. Indeed, microsecond precision in event correlation across a large network can be achieved in this manner.
  • clocks can be built easily and cheaply from commercial components and, even if one is used with each of the thousands of event recorders in a large telecommunications network, the substantial cost savings which will be afforded over conventional methods of synchronisation will compounded by large cost savings in event correlation and analysis.
  • the need for separate lines or channels devoted to the transmission of synchronising pulses throughout the network is eliminated.
  • the invention consists of a method of recording events occurring in each of a plurality of stations across a telecommunications network wherein events occurring at each station are time-stamped to a common time reference by using time signals derived from the radio signals emitted by an earth satellite system, such as the GPS system.
  • an earth satellite system such as the GPS system.
  • a pulse-counter to count the oscillator pulses, and the synchronising pulses derived from the satellite signals to regularly reset the counter
  • a second of time can be sub-divided as required while remaining in precise synchronism with the remainder of the time signals.
  • a UTC-format time-signal code accurate to the microsecond can be readily achieved in this way. That is, events can be time-stamped to a highly precise time reference which is common across the network. This level of event-correlation precision has hitherto been wholly impossible on existing networks.
  • the invention comprises an event recorder for use at multiple sites in a large telecommunications system, which recorder comprises: an input for receiving event data registered by a plurality of event monitors; clock means for generating a precision time-signal code, including sub-second time intervals, from the radio signals received from an earth satellite system; and, memory means for recording the event data as it is received together with the time-signal code corresponding to the time of receipt of the event data.
  • the present invention comprises a telecommunications network having a plurality of such event recorders together with at least one central station capable of interrogating each recorder, downloading the time-stamped event data recorded thereby and automatically correlating event data from different recorders according to time.
  • Figure 1 is a diagram of a small part of the telecommunications network indicating telecommunications links between exchanges incorporating event- recorders and the Internet,
  • Figure 2 is a block circuit diagram of a stand-alone event recorder comprising the first example of the implementation of this invention
  • Figures 3A and 3B represent two plug-in boards (a data-capture board and a GPS clock board respectively) suitable for use with the bus system of a computer, comprising the second example of the implementation of this invention.
  • the telecommunications network 10 of this example comprises a plurality of switches or exchanges 12 interconnected by telecommunications links 14.
  • Each exchange includes an event recorder 16 adapted to record events (including faults and alarms) occurring within the exchange and detected by a plurality of event monitors or detectors 17 together with the time according to a local
  • each recorder functions as a datalogger which has an Internet address and is therefore capable of being interrogated via the Internet (generally indicated at 19) which may include portion of network 10.
  • the Internet generally indicated at 19
  • Also connected to the Internet is a central control/analysis station 20 with its own local clock 18a so that, either automatically or under human control, station 20 can be used to
  • the central station 15 interrogate any or all of recorders 16 to download their event data — each with its local time-stamp.
  • event data is downloaded from recorders in different exchanges
  • the central station is preferably programmed to automatically correlate and present the events to the operator in time sequence according to their time- stamps. If further analysis is necessary, this raw event data may then be used as
  • Typical transmission and transfer delays (signified by numerals followed by ⁇ s, indicating microseconds) have been inserted in some links 14 and in the exchanges
  • FIG. 30 illustrates a first example of the way in which the invention may be implemented in the hardware of each recorder 16.
  • the local clock 18 of Figure 1 is shown as a GPS receiver/clock module 22 which is based upon a board-based GPS receiver sold by Rockwell under the trade mark JUPITER using its ZODIAC chipset, GPS clock 22 being connected to a GPS antenna 24 (also available from Rockwell) via aerial feed-line 25.
  • GPS clock 22 has two outputs: (i) a data-bus 26 on which a UTC time signal is generated indicating the year, month, day, hour and second; and, (ii) a synch-line 28 which carries a precisely timed synchronising pulse of one microsecond duration each second to signify when the indicated UTC time is valid.
  • This synchronising pulse may hereafter be called the 'synch-pulse'.
  • the synch-pulse is fed via line 28a to each of a series of BCD decade counters 30a, 30b and 30c (eg 74HC160 chips) to precisely and simultaneously reset all counters once a second, and the synch-pulse is fed via line 28b to an interrupt port 32 on a microprocessor 34 to provide a precise time reference for microprocessor operations.
  • the first counter decade 30a in the series receives a 1 MHz clock input on line 36 from a divider circuit 38 which is fed in-turn from the clock oscillator 40 of microprocessor 34.
  • the microprocessor (eg an AT89C52) has a clock rate of 16 MHz and circuit 38 (eg, a 74HC161 chip) is arranged to divide by a factor of 16.
  • the carry-output of counter decade 30a is fed as the clock input to counter 30b and so-on down the counter series.
  • circuit 38 eg, a 74HC161 chip
  • the carry-output of counter decade 30a is fed as the clock input to counter 30b and so-on down the counter series.
  • only three counter decades are illustrated but it will be appreciated that a series of six decade counters would be needed to collectively provide an output count of microseconds in precise synchrony with the GPS clock 22.
  • divider 38 is arranged to divide by a factor of 16,000 rather than 16, giving a millisecond rather than a microsecond count, decade 30a counting milliseconds, decade 30b counting tens of milliseconds and decade 30c counting hundreds of milliseconds (as indicated on their respective output busses).
  • the outputs of counters 30a and 30b are fed to an 8-bit latch or buffer 42a (eg a 74HC374 chip) while the output of counter 30c is fed to a similar latch 42b.
  • latches 42a and 42b are together presented with a continuous and synchronised millisecond count. This count is precisely synchronised to the UTC-format coded time-signal generated by clock module 22.
  • Microprocessor 34 may be reset if desired by using a reset circuit 46.
  • event data is fed to recorder 16 via each of two 16-channel data input busses 50a and 50b via two input conditioning circuits 52a and 52b (eg 74HC4538 chips) into a multiplexer 54 (eg 74HC138 chips).
  • a 'select' signal on line 56 from microprocessor output port 58 data in the multiplexer
  • processor 34 generates a memory address at its address port 76 to indicate where all the data now presented to the memory device is to be stored.
  • the address 5 information is conveyed to memory 26 via address bus 78 and effects the recording of the presented event data as a time-stamped unit, completing the event-recording cycle.
  • recorder 16 can be implemented as plug-in cards on a computer bus so that the separate microprocessor (34) of the first example is not needed.
  • a system of this type is illustrated (in simplified form) in Figures 3A and 3B which represent two separate plug-in cards designed to interface with a VME bus.
  • card 100 shown in broken lines
  • Incoming event data from connector 104 is fed on input-bus 106, via signal conditioner 108, to a latch circuit 110 which is enabled by OR circuit 1 12 that detects the presence of incoming data on any of the input channels of bus 106a, the output of OR circuit 1 12 being fed to latch 110 via line 114.
  • the presence of incoming data is also signalled to the computer's processor via line 114a and VME bus connector
  • the output of a 1 MHz signal generator 116 is fed to a chain of six decade counters 1 18, the output from which — representing a microsecond count — is fed via bus line 120 to VME bus connector 102. Once a second a synchronising pulse on line 122 from connector 102 resets all counter decades 1 18.
  • the computer processor When the computer processor (not shown) receives the signal on line 120 and via bus connector 102 indicating the presence of data, it will address card 100 via connector 102 and address-bus 124 which is connected to a VME interface circuit 126. When interface 126 recognises the appropriate code on bus 124, it will enable — via control line 128 — the output of data held in latch 110 onto data-bus 106b. This data is read by the computer processor together with the microsecond count on data-bus 120.
  • FIG. 3B shows a GPS clock card 150 suitable for use in conjunction with the data- capture card of Figure 3A.
  • Card 150 is provided with a VME bus connector 152, an VME interface circuit 154, a data latch circuit 156 and a GPS clock module 158.
  • a connector 160 is provided for the GPS aerial (not shown) and is connected to module 158 via aerial line 162.
  • the UTC time output from GPS module 158 is placed on data bus 164 and presented to latch 156.
  • the time data is accepted by latch 156.
  • the latched time data is placed on the VME bus via bus 164a upon the receipt of an output- enable command from the processor via the VME interface 154 and line 170.
  • the synch-pulse from GPS module 158 (that effects resetting of counters 118 via line 122 in Figure 3A) appears on output line 172 which is connected direct to bus- connector 152.
  • VME-based of the second example functions in a very similar manner to the stand-alone circuit of the first example, it will not be described further.
  • the capture of the event and time data, as well as the generation of the microsecond count can be implemented in firmware on a microprocessor or by means of a stored software program in a computer. This would essentially eliminate the need for card 100 of Figure 3A, except that an input card for the event data is still required.
  • An example of a suitable firmware program is given below, the program comprising a series modules having discrete functions.
  • Network interfaces the network to the local microcontroller.
  • Datajink performs message transport between the local microprocessor and the network.
  • Network_message formats network command and data messages.
  • Network_buffer provides buffer space for storing (receive and transmit) unformatted debug and control messages.
  • Datajnterpret processes commands and data received from the network, generating and required response.
  • Event_reader reads event inputs.
  • Event_processor processes input events.
  • Event_buffer provides buffer space for storing processed event inputs.
  • RTC provides a reference derived real-time clock.
  • Timer_driver provides timing information for the UTC module.
  • UTC_message assembles and frames the UTC date and time message.
  • UTCjnterface provides the physical interface to the UTC source.
  • Time_date provides the real time and date referenced to UTC.
  • Timer provides event timing for Event_processor.
  • Memoryjnterface interfaces non-volatile memory.
  • Memory_driver effects transfer of data to memory.
  • Event_control a state machine that controls Event_reader.
  • UTC_message receives the UTC time code via UTCjnterface once every second.
  • RTC effects the subdivision of each second as required.
  • Event_read samples the inputs at discrete times determined by Schedular using 5 timing information from RTC.
  • Step 2 Old Input Sample is replaced by Current Input Sample. 0
  • the UTC time code is read from Time_date and stored with the Current Input Sample in memory by Memory_driver and Memoryjnterface. Events held by Event_buffer, Schedular directs Memoryj river and Memoryjnterface to transfer the event data to nonvolatile memory.
  • Messages received by Network via Datajink are formatted and buffered by Networkjnessage and Network_buffer, respectively. Any requests for input information will be formatted by Network ormat and handed to Networkj uffer and from thence to Datajnterpreter to place any information in non-volatile memory on the network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electric Clocks (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Radio Relay Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

La présente invention concerne une technique de consignation d'événements se produisant au niveau de stations (12) situées en des points géographiquement distincts dans toute l'étendue d'un grand réseau de télécommunications (10). L'invention, qui concerne également des dispositifs de consignation des événements (16), concerne aussi un système de télécommunications facilitant grandement la corrélation temporelle des événements consignés. En l'occurrence, les signaux radio provenant d'un système satellitaire terrestre servent à générer aux différents points géographiques des signaux temporels de précision qui permettent l'horodatage par chaque station (12) des données d'événements localement consignés. Les données consignées et les données horodatées provenant de chaque station (12) sont téléchargeables vers un centre de contrôle (20) et automatiquement classés chronologiquement avec une précision d'environ une ?s pour l'ensemble du réseau.
PCT/AU1997/000643 1996-09-27 1997-09-26 Consignation et analyse des evenements dans des reseaux de telecommunications WO1998013966A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP10515073A JP2001501395A (ja) 1996-09-27 1997-09-26 遠隔通信ネットワークにおける事象記録と分析
BR9711547-9A BR9711547A (pt) 1996-09-27 1997-09-26 Recuparação de eventos e análises em sistema detelecomunicações
EP97918847A EP0965197A1 (fr) 1996-09-27 1997-09-26 Consignation et analyse des evenements dans des reseaux de telecommunications
CA002267254A CA2267254A1 (fr) 1996-09-27 1997-09-26 Consignation et analyse des evenements dans des reseaux de telecommunications
AU42911/97A AU716041B2 (en) 1996-09-27 1997-09-26 Event recording and analysis in telecommunications networks
NO991498A NO991498L (no) 1996-09-27 1999-03-26 Hendelsesregistrering og -analyse i telekommunikasjonsnett

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO2649 1996-09-27
AUPO2649A AUPO264996A0 (en) 1996-09-27 1996-09-27 Event recording and analysis in telecommunication networks

Publications (1)

Publication Number Publication Date
WO1998013966A1 true WO1998013966A1 (fr) 1998-04-02

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PCT/AU1997/000643 WO1998013966A1 (fr) 1996-09-27 1997-09-26 Consignation et analyse des evenements dans des reseaux de telecommunications

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EP (1) EP0965197A1 (fr)
JP (1) JP2001501395A (fr)
AU (1) AUPO264996A0 (fr)
BR (1) BR9711547A (fr)
CA (1) CA2267254A1 (fr)
NO (1) NO991498L (fr)
WO (1) WO1998013966A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026289A1 (fr) * 1999-10-04 2001-04-12 Nokia Corporation Procede de mesure de la qualite de service, et appareil a cet effet
US6532274B1 (en) 1999-01-12 2003-03-11 Telefonaktiebolaget Lm Ericsson (Publ) Synchronization method and arrangement
JP2003526833A (ja) * 1999-02-26 2003-09-09 レヴェオ・インコーポレーテッド グローバル時間同期システム、装置および方法
WO2008118874A3 (fr) * 2007-03-23 2008-12-24 Qualcomm Inc Collecte et/ou traitement de données à l'aide de plusieurs capteurs
US7615875B1 (en) * 2007-02-02 2009-11-10 Sprint Communications Company L.P. Power system for a telecommunications facility
US8090972B2 (en) 2007-11-26 2012-01-03 Vestas Wind Systems A/S Method and system for registering events in wind turbines of a wind power system
DE10128927B4 (de) * 2001-06-15 2013-10-17 Deutsche Telekom Ag Verfahren zur Ermittlung der Uhrzeit in zumindest zwei miteinander zusammenwirkenden Messrechnern
US8898019B2 (en) 2007-09-21 2014-11-25 Geospace Technologies, Lp Low-power satellite-timed seismic data acquisition system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551126A1 (fr) * 1992-01-10 1993-07-14 Nec Corporation Système de téléappel à radiodiffusion synchronisée
WO1994028433A1 (fr) * 1993-05-27 1994-12-08 Stellar Gps Corporation Source de temps/frequence synchronisee basee sur un systeme de positionnement global (spg)

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551126A1 (fr) * 1992-01-10 1993-07-14 Nec Corporation Système de téléappel à radiodiffusion synchronisée
WO1994028433A1 (fr) * 1993-05-27 1994-12-08 Stellar Gps Corporation Source de temps/frequence synchronisee basee sur un systeme de positionnement global (spg)

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"ATHENA User's Guide", 26 March 1996. *
PROCEEDING OF 1995 IEEE 38TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, Part 1, HALANG et al., "A High Precision Timing and Interrupt Controller to Support Distributed Real-Time Operating", pages 9-12. *
REAL-TIME SYSTEMS, Vol. 12, No. 3, May 1997, VERISSIMO et al., "CESIUMSPRAY: A Precise and Acurate Global Time Service for Large-Scale Systems", pages 243-294. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6532274B1 (en) 1999-01-12 2003-03-11 Telefonaktiebolaget Lm Ericsson (Publ) Synchronization method and arrangement
JP2003526833A (ja) * 1999-02-26 2003-09-09 レヴェオ・インコーポレーテッド グローバル時間同期システム、装置および方法
US6577648B1 (en) 1999-10-04 2003-06-10 Nokia Corporation Method and apparatus for determining VoIP QoS characteristics of a network using multiple streams of packets and synchronizing measurements of the streams
WO2001026289A1 (fr) * 1999-10-04 2001-04-12 Nokia Corporation Procede de mesure de la qualite de service, et appareil a cet effet
DE10128927B4 (de) * 2001-06-15 2013-10-17 Deutsche Telekom Ag Verfahren zur Ermittlung der Uhrzeit in zumindest zwei miteinander zusammenwirkenden Messrechnern
US7615875B1 (en) * 2007-02-02 2009-11-10 Sprint Communications Company L.P. Power system for a telecommunications facility
US9220410B2 (en) 2007-03-23 2015-12-29 Qualcomm Incorporated Multi-sensor data collection and/or processing
WO2008118874A3 (fr) * 2007-03-23 2008-12-24 Qualcomm Inc Collecte et/ou traitement de données à l'aide de plusieurs capteurs
US11659996B2 (en) 2007-03-23 2023-05-30 Qualcomm Incorporated Multi-sensor data collection and/or processing
US8718938B2 (en) 2007-03-23 2014-05-06 Qualcomm Incorporated Multi-sensor data collection and/or processing
US8898019B2 (en) 2007-09-21 2014-11-25 Geospace Technologies, Lp Low-power satellite-timed seismic data acquisition system
US9255999B2 (en) 2007-09-21 2016-02-09 Geospace Technologies, Lp Low-power satellite-timed seismic data acquisition system
US8090972B2 (en) 2007-11-26 2012-01-03 Vestas Wind Systems A/S Method and system for registering events in wind turbines of a wind power system

Also Published As

Publication number Publication date
AUPO264996A0 (en) 1996-10-24
CA2267254A1 (fr) 1998-04-02
JP2001501395A (ja) 2001-01-30
NO991498D0 (no) 1999-03-26
NO991498L (no) 1999-05-14
BR9711547A (pt) 2001-11-27
EP0965197A1 (fr) 1999-12-22

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