WO2003019833A3 - Sdh/sonet hitless switching - Google Patents

Sdh/sonet hitless switching Download PDF

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Publication number
WO2003019833A3
WO2003019833A3 PCT/IL2002/000715 IL0200715W WO03019833A3 WO 2003019833 A3 WO2003019833 A3 WO 2003019833A3 IL 0200715 W IL0200715 W IL 0200715W WO 03019833 A3 WO03019833 A3 WO 03019833A3
Authority
WO
WIPO (PCT)
Prior art keywords
segment
vcs
versions
checksum
byte
Prior art date
Application number
PCT/IL2002/000715
Other languages
French (fr)
Other versions
WO2003019833A2 (en
Inventor
Rony Levy
Zvi Topman
Eli Lotan
Moshe Topman
Original Assignee
Radiotel Ltd
Rony Levy
Zvi Topman
Eli Lotan
Moshe Topman
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 Radiotel Ltd, Rony Levy, Zvi Topman, Eli Lotan, Moshe Topman filed Critical Radiotel Ltd
Priority to AU2002329018A priority Critical patent/AU2002329018A1/en
Publication of WO2003019833A2 publication Critical patent/WO2003019833A2/en
Publication of WO2003019833A3 publication Critical patent/WO2003019833A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H04J3/0623—Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
    • H04J2203/0094—Virtual Concatenation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

In a system for transmitting a digital data stream, wherein the data are formatted into a series of virtual containers (VCs) and routed through several paths in parallel - a method for hitless switching between the versions that arrive over the various paths. The method includes inserting into each VC an identifying code and a parity checksum, or, in the case of a multi-segment VC, a checksum for each segment. At the node of convergence the method calls for delaying any received version by a respective amount, such that will cause all the versions to become aligned in time, so that VCs having the same identifying code flow synchronously byte-for-byte. For each received version and for each VC or segment, parity is calculated and compared with the corresponding checksum, to determine a respective error level. The error levels are compared among the versions for each successive VC or segment and the VC or segment with the lowest error level is selected and inserted into an output data stream. Whenever the version, from which a next VC or segment is selected, changes, switching occurs at the boundary between successive VCs or segments, thus avoiding hits.
PCT/IL2002/000715 2001-08-30 2002-08-29 Sdh/sonet hitless switching WO2003019833A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002329018A AU2002329018A1 (en) 2001-08-30 2002-08-29 Sdh/sonet hitless switching

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL14521501A IL145215A0 (en) 2001-08-30 2001-08-30 Sdh/sonet hitless switching
IL145215 2001-08-30

Publications (2)

Publication Number Publication Date
WO2003019833A2 WO2003019833A2 (en) 2003-03-06
WO2003019833A3 true WO2003019833A3 (en) 2004-03-04

Family

ID=11075751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2002/000715 WO2003019833A2 (en) 2001-08-30 2002-08-29 Sdh/sonet hitless switching

Country Status (3)

Country Link
AU (1) AU2002329018A1 (en)
IL (1) IL145215A0 (en)
WO (1) WO2003019833A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463808A2 (en) * 1990-06-28 1992-01-02 AT&T Corp. Switching of a digital signal to an alternate channel transmitted via a different route
US5644567A (en) * 1994-08-03 1997-07-01 Fujitsu Limited Line switching method and line switching apparatus
EP0999653A2 (en) * 1998-11-05 2000-05-10 Alcatel Method and system for hit-less switching
US6246668B1 (en) * 1998-06-09 2001-06-12 Nortel Networks Limited Hitless manual path switching using linked pointer processors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463808A2 (en) * 1990-06-28 1992-01-02 AT&T Corp. Switching of a digital signal to an alternate channel transmitted via a different route
US5644567A (en) * 1994-08-03 1997-07-01 Fujitsu Limited Line switching method and line switching apparatus
US6246668B1 (en) * 1998-06-09 2001-06-12 Nortel Networks Limited Hitless manual path switching using linked pointer processors
EP0999653A2 (en) * 1998-11-05 2000-05-10 Alcatel Method and system for hit-less switching

Also Published As

Publication number Publication date
AU2002329018A1 (en) 2003-03-10
WO2003019833A2 (en) 2003-03-06
IL145215A0 (en) 2002-06-30

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