WO1997013203A2 - Verfahren zur aufrechterhaltung des mikrosynchronen betriebs von gedoppelten informationsverarbeitenden einheiten - Google Patents
Verfahren zur aufrechterhaltung des mikrosynchronen betriebs von gedoppelten informationsverarbeitenden einheiten Download PDFInfo
- Publication number
- WO1997013203A2 WO1997013203A2 PCT/DE1996/001843 DE9601843W WO9713203A2 WO 1997013203 A2 WO1997013203 A2 WO 1997013203A2 DE 9601843 W DE9601843 W DE 9601843W WO 9713203 A2 WO9713203 A2 WO 9713203A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- processing
- units
- atm30
- clock
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/555—Error detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1515—Non-blocking multistage, e.g. Clos
- H04L49/153—ATM switching fabrics having parallel switch planes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1553—Interconnection of ATM switching modules, e.g. ATM switching fabrics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5625—Operations, administration and maintenance [OAM]
- H04L2012/5627—Fault tolerance and recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
- H04L2012/5674—Synchronisation, timing recovery or alignment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1515—Non-blocking multistage, e.g. Clos
- H04L49/1523—Parallel switch fabric planes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/40—Constructional details, e.g. power supply, mechanical construction or backplane
Definitions
- the invention relates to a method for maintaining the microsynchronous operation of duplicated information processing units according to the preamble of patent claim 1.
- the duplicated units therefore work with a common internal processing clock, which is independent of the clock, with the information to be processed receive or information processing results are sent.
- such units are each equipped with a device for error monitoring of the information received and the information processing results to be transmitted.
- the reason for the above-mentioned duplication of the information processing units lies in the endeavor to ensure a high level of reliability and failure safety. If information which is received in accordance with the clock system mentioned is passed on to the other clock system for the purpose of processing, flip-flops which have been passed through in this connection can lead to fluctuations in the signal transfer by one clock period, so that the microsynchronism with respect to corresponding components of the two units is disturbed and the desired failure and error security can no longer be guaranteed. In addition, the information supplied to the units is influenced in different ways on the transmission paths there.
- the object of the invention is therefore to prevent the mentioned disturbances of the microsynchronicity of the operation of such double units.
- the exchanged synchronization signals are multiplex signals from individual synchronization signals for the individual internal input and output interface circuits.
- Claim 4 relates to the procedure when the processing units are taken into operation or put back into operation, accordingly the repetition cycles of the demultiplexed units delivered by the processing components of the units Individual synchronization signals are reset by a common reset signal derived from the internal system clock.
- Claim 5 specifies how the output interface circuits of the master and checker processing components are to be reset in the case of start-up or recommissioning if there is no separate reset signal available for the clock system relevant for these output interface circuits , this is rather derived from the system clock.
- the reset signal of the checker processing component is therefore derived from the output signal of the master processing component.
- FIG. 1 shows a possible constellation of information processing units with processing components to which the method according to the invention can be applied.
- FIGS. 2 and 3 are time diagrams to illustrate the time relationships of the synchronization signals.
- FIG. 4 shows the output areas of a master and an associated checker processing component to illustrate the conditions during a reset.
- FIG. 1 shows two information processing units CTRO and CTR1, which may be used, for example, to process ATM information. These processing units are connected here to a switching network, which in the case shown has duplicate parts SNO and SN1.
- the processing units CRTO and CRT1 are connected via a network of reception lines IrO, lrl and transmission lines ltO, ltl for the transmission Carrying ATM information connected to the switching network parts SNO and SN1 in such a way that ATM information coming from each switching network part equally reaches both the one and the other processing unit, and that ATM-In emitted by these processing units ⁇ formations can be supplied equally to both switching power supplies SNO and SN1.
- the processing units CTRO and CTR1 each have two processing components C-ATM30 and M-ATM30, which operate in a so-called master checker configuration, i.e. in the checker processing component C-ATM30, the transmission outputs TPO and TP1 are connected as inputs, the transmission outputs TPO and TP1 of the respective associated master processing component M-ATM30 and, in the first line, for transmission to the switching power supply units SNO or SNl receive certain ATM send information as input information.
- Internal comparators (not shown here) of the Checker processing components compare the input signals received in this way with signals generated internally as output signals and, if they are found to be unequal, emit a corresponding error message.
- the ATM information coming from the switching network halves SNO and SN1 is received with a reception clock RXCKO or RXCK1.
- the received ATM information is processed with a non-synchronous internal system clock SCLK.
- This dashed line influencing of reception area and transmission area and processing area of the processing components is illustrated by a dashed line crossing the processing units CTRO and CTR1.
- the signal transfer from a component of the processing components that is under the influence of one clock system to a component influenced by the other clock system can fluctuate by one clock period. This will be without any special Measures of the microsynchronous parallel operation of the processing components are disrupted, which means that the parallel operation of the processing units CTRO and CTR1 is no longer guaranteed.
- the information received is temporarily stored in a manner not shown here before it is processed or corresponding processing results are passed on before it is passed on, and the times of the transfer for information processing or the transfer of information results All processing components are synchronized with one another by exchanging information signals.
- the procedure is such that synchronous operation between the master and the
- Checker processing components of the two processing units are produced by delivering a synchronization signal MSO, which characterizes the processing phase and is derived from the internal system clock SCLK, to the respective other processing components, and then by exchanging synchronization signals RSO on the way via a control LC a parallel run of the processing components from processing unit to processing unit CTRO or CTR1 is produced.
- MSO synchronization signal
- FIG. 2 shows such a synchronization output signal MSO, which represents the synchronization input signal MSI of the respective other processing component.
- FIG. 3 shows the synchronizing output signals RSO exchanged between the processing units CTRO and CTR1, which are synchronizing input signals of the respective other processing unit.
- the mentioned synchronization signals MSO and RSO represent multiplex signals from individual synchronization signals for quasi-parallel operated parts of the processing components.
- the received ATM information can be affected in various ways by transmission errors on the way from the switching network parts SNO and SN1 to the processing units CTRO and CTRl. Such transmission errors are recognized by monitoring devices not shown here, with the result that the disturbed information is discarded, that is to say is not fed to processing, and that empty information is emitted as the corresponding processing result.
- Receiving disturbed ATM information also means that the processing unit concerned does not send a synchronization signal RSO to the partner unit. This in turn has the consequence that the partner unit also discards this due to the absence of the expected synchronization signal, even though it has received perfect ATM information, which prevents the processing units from sending out different ATM information.
- the repetition cycles of the synchronization signals MSO are reset by a common reset signal derived from the internal system clock SCLK.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Hardware Redundancy (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9513884A JPH11512854A (ja) | 1995-09-29 | 1996-09-26 | 二重化情報処理ユニットのマイクロ同期動作の維持方法 |
EP96938954A EP0852863A2 (de) | 1995-09-29 | 1996-09-26 | Verfahren zur aufrechterhaltung des mikrosynchronen betriebs von gedoppelten informationsverarbeitenden einheiten |
US09/043,985 US6353622B1 (en) | 1995-09-29 | 1996-09-26 | Process for maintaining the microsynchronous operation of double information-processing units |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19536518.6 | 1995-09-29 | ||
DE19536518A DE19536518C2 (de) | 1995-09-29 | 1995-09-29 | Verfahren zur Aufrechterhaltung des mikrosynchronen Betriebs von gedoppelten informationsverarbeitenden Einheiten |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997013203A2 true WO1997013203A2 (de) | 1997-04-10 |
WO1997013203A3 WO1997013203A3 (de) | 1997-05-15 |
Family
ID=7773704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001843 WO1997013203A2 (de) | 1995-09-29 | 1996-09-26 | Verfahren zur aufrechterhaltung des mikrosynchronen betriebs von gedoppelten informationsverarbeitenden einheiten |
Country Status (7)
Country | Link |
---|---|
US (1) | US6353622B1 (de) |
EP (1) | EP0852863A2 (de) |
JP (1) | JPH11512854A (de) |
CN (1) | CN1097914C (de) |
CA (1) | CA2233358A1 (de) |
DE (1) | DE19536518C2 (de) |
WO (1) | WO1997013203A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1186994A2 (de) * | 2000-09-06 | 2002-03-13 | Nec Corporation | Eingangsdaten-Verarbeitungs-Schaltung |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1096741A1 (de) * | 1999-10-26 | 2001-05-02 | Siemens Aktiengesellschaft | Verfahren zur Sicherstellung der synchronen Verarbeitung in Zwei Signalverarbeitungseinrichtungen |
DE10122693B4 (de) * | 2001-05-10 | 2004-05-06 | Siemens Ag | Verfahren zum Betreiben einer redundanten Prozessoreinheit für ein hochverfügbares Rechensystem |
CN1549970A (zh) * | 2001-08-31 | 2004-11-24 | 通过具有主设备-校验器冗余设计的电路中的异步接口传输大量数据 | |
JP2009176116A (ja) * | 2008-01-25 | 2009-08-06 | Univ Waseda | マルチプロセッサシステムおよびマルチプロセッサシステムの同期方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2258582A (en) * | 1991-08-02 | 1993-02-10 | Plessey Telecomm | An atm switching arrangement |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2612100A1 (de) * | 1976-03-22 | 1977-10-06 | Siemens Ag | Digitale datenverarbeitungsanordnung, insbesondere fuer die eisenbahnsicherungstechnik |
US4779087A (en) * | 1985-02-13 | 1988-10-18 | Fujitsu Limited | Loop transmission system with frame synchronization control |
NL8501737A (nl) * | 1985-06-17 | 1987-01-16 | At & T & Philips Telecomm | Hogere orde digitaal transmissiesysteem voorzien van een multiplexer en een demultiplexer. |
US5117442A (en) * | 1988-12-14 | 1992-05-26 | National Semiconductor Corporation | Methods and circuits for synchronizing signals in a modular redundant fault tolerant computer system |
JP2535615B2 (ja) * | 1989-08-14 | 1996-09-18 | 株式会社東芝 | デ―タ同期伝送方式 |
JP3158213B2 (ja) * | 1991-09-12 | 2001-04-23 | 富士通株式会社 | 並列伝送方法および装置 |
JP2671699B2 (ja) * | 1991-11-15 | 1997-10-29 | 三菱電機株式会社 | セル交換装置 |
DE4227118C1 (de) * | 1992-08-17 | 1993-11-25 | Ant Nachrichtentech | Vermittlungseinrichtung sowohl für dienstintegrierte als auch für dienstspezifische Netze zur Vermittlung von Schmal- und Breitband-Diensten |
KR0177733B1 (ko) * | 1994-08-26 | 1999-05-15 | 정장호 | 데이타 전송장치의 클럭동기 회로 |
JP3526492B2 (ja) * | 1995-09-19 | 2004-05-17 | 富士通株式会社 | 並列処理システム |
-
1995
- 1995-09-29 DE DE19536518A patent/DE19536518C2/de not_active Expired - Fee Related
-
1996
- 1996-09-26 EP EP96938954A patent/EP0852863A2/de not_active Withdrawn
- 1996-09-26 CN CN96197325A patent/CN1097914C/zh not_active Expired - Fee Related
- 1996-09-26 CA CA002233358A patent/CA2233358A1/en not_active Abandoned
- 1996-09-26 WO PCT/DE1996/001843 patent/WO1997013203A2/de not_active Application Discontinuation
- 1996-09-26 JP JP9513884A patent/JPH11512854A/ja not_active Ceased
- 1996-09-26 US US09/043,985 patent/US6353622B1/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2258582A (en) * | 1991-08-02 | 1993-02-10 | Plessey Telecomm | An atm switching arrangement |
Non-Patent Citations (1)
Title |
---|
ERICSSON REVIEW, Bd. 70, Nr. 1, 1993, SE, Seiten 12-20, XP000385546 M. LARSSON ET AL: * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1186994A2 (de) * | 2000-09-06 | 2002-03-13 | Nec Corporation | Eingangsdaten-Verarbeitungs-Schaltung |
EP1186994A3 (de) * | 2000-09-06 | 2006-07-05 | Nec Corporation | Eingangsdaten-Verarbeitungs-Schaltung |
Also Published As
Publication number | Publication date |
---|---|
CN1198279A (zh) | 1998-11-04 |
EP0852863A2 (de) | 1998-07-15 |
CN1097914C (zh) | 2003-01-01 |
US6353622B1 (en) | 2002-03-05 |
DE19536518C2 (de) | 1998-07-09 |
CA2233358A1 (en) | 1997-04-10 |
WO1997013203A3 (de) | 1997-05-15 |
JPH11512854A (ja) | 1999-11-02 |
DE19536518A1 (de) | 1997-04-10 |
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