CA2061850A1 - Rotating-access atm-stm packet switch - Google Patents

Rotating-access atm-stm packet switch

Info

Publication number
CA2061850A1
CA2061850A1 CA2061850A CA2061850A CA2061850A1 CA 2061850 A1 CA2061850 A1 CA 2061850A1 CA 2061850 A CA2061850 A CA 2061850A CA 2061850 A CA2061850 A CA 2061850A CA 2061850 A1 CA2061850 A1 CA 2061850A1
Authority
CA
Canada
Prior art keywords
atm
architecture
bsb
buffer
rotating
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.)
Granted
Application number
CA2061850A
Other languages
French (fr)
Other versions
CA2061850C (en
Inventor
Maged E. Beshai
Ernst August Munter
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of CA2061850A1 publication Critical patent/CA2061850A1/en
Application granted granted Critical
Publication of CA2061850C publication Critical patent/CA2061850C/en
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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/10—Packet switching elements characterised by the switching fabric construction
    • H04L49/104—Asynchronous transfer mode [ATM] switching fabrics
    • H04L49/105—ATM switching elements
    • H04L49/106—ATM switching elements using space switching, e.g. crossbar or matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/10—Packet switching elements characterised by the switching fabric construction
    • H04L49/104—Asynchronous transfer mode [ATM] switching fabrics
    • H04L49/105—ATM switching elements
    • H04L49/108—ATM switching elements using shared central buffer
    • 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
    • H04L49/15—Interconnection of switching modules
    • H04L49/1553—Interconnection of ATM switching modules, e.g. ATM switching fabrics
    • H04L49/1576—Crossbar or matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/45—Arrangements for providing or supporting expansion
    • H04L49/455—Provisions for supporting expansion in ATM switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/606—Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • 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
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0012—Switching modules and their interconnections
    • 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
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5649—Cell delay or jitter
    • 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
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
    • H04L2012/5679—Arbitration or scheduling
    • 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
    • H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
    • H04L2012/5681—Buffer or queue management

Abstract

A new architecture of an ATM or ATM/STM switching node which is functionally equivalent to the classical buffer-space-buffer (BSB) architecture is disclosed. In the basic embodiment, it uses middle packet buffers with a rotator (commutator) at its input and output. It has two main advantages over the BSB architecture. First of all, in the ATM mode, the need for arbitration when more than one inlet competes for the same outlet during the same time slot is eliminated. Each packet knows when to proceed without being aware of the competing packets.
This greatly simplifies the switching-control mechanism.
Secondly, the switch hardware complexity is reduced through the use of clock-driven rather than state-controlled cross points. The cross-point ratio is 4/?n, where n is the number of inlets (outlets).
CA002061850A 1991-04-11 1992-02-26 Rotating-access atm-stm packet switch Expired - Lifetime CA2061850C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/683,920 US5168492A (en) 1991-04-11 1991-04-11 Rotating-access ATM-STM packet switch
US07/683,920 1991-04-11

Publications (2)

Publication Number Publication Date
CA2061850A1 true CA2061850A1 (en) 1992-10-12
CA2061850C CA2061850C (en) 1994-08-02

Family

ID=24746011

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002061850A Expired - Lifetime CA2061850C (en) 1991-04-11 1992-02-26 Rotating-access atm-stm packet switch

Country Status (3)

Country Link
US (1) US5168492A (en)
JP (1) JP3023732B2 (en)
CA (1) CA2061850C (en)

Families Citing this family (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447769A3 (en) * 1990-03-12 1994-12-21 Sel Alcatel Ag Method and circuit arrangement for managing uniform unities and switching element
EP0528086B1 (en) * 1991-08-19 1999-08-04 Siemens Aktiengesellschaft Procedure and arrangement for the communication of STM-information through ATM-switching exchanges
EP0528087A1 (en) * 1991-08-19 1993-02-24 Siemens Aktiengesellschaft Procedure and arrangement for the communication of STM-information through ATM-switching exchanges
GB9200267D0 (en) * 1992-01-08 1992-02-26 Plessey Telecomm Stm switching arrangement
MX9306994A (en) * 1992-12-15 1994-06-30 Ericsson Telefon Ab L M FLOW CONTROL SYSTEM FOR PACKAGE SWITCHES.
JPH06276214A (en) * 1993-03-18 1994-09-30 Hitachi Ltd Stm/atm signal mixture processing method and switching system
US5377182A (en) * 1993-08-18 1994-12-27 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Non-blocking crossbar permutation engine with constant routing latency
FR2711465B1 (en) * 1993-10-20 1996-01-12 Boyer Pierre Input queuing system designed in particular to be connected to the inputs of a spatial type switching matrix without blocking.
SE515201C2 (en) * 1993-11-26 2001-06-25 Ericsson Telefon Ab L M Method and apparatus for clock signal generation
EP0737392B1 (en) * 1993-12-31 2000-04-12 International Business Machines Corporation Switching apparatus and method for multiple traffic classes
US6430195B1 (en) 1994-05-05 2002-08-06 Sprint Communications Company L.P. Broadband telecommunications system interface
US6031840A (en) * 1995-12-07 2000-02-29 Sprint Communications Co. L.P. Telecommunications system
US6172977B1 (en) * 1994-05-05 2001-01-09 Sprint Communications Company, L. P. ATM direct access line system
US6314103B1 (en) 1994-05-05 2001-11-06 Sprint Communications Company, L.P. System and method for allocating bandwidth for a call
US6023474A (en) * 1996-11-22 2000-02-08 Sprint Communications C.O.L.P. Broadband telecommunications system interface
US6633561B2 (en) 1994-05-05 2003-10-14 Sprint Communications Company, L.P. Method, system and apparatus for telecommunications control
US5920562A (en) * 1996-11-22 1999-07-06 Sprint Communications Co. L.P. Systems and methods for providing enhanced services for telecommunication call
US5926482A (en) 1994-05-05 1999-07-20 Sprint Communications Co. L.P. Telecommunications apparatus, system, and method with an enhanced signal transfer point
US5991301A (en) * 1994-05-05 1999-11-23 Sprint Communications Co. L.P. Broadband telecommunications system
US6181703B1 (en) 1995-09-08 2001-01-30 Sprint Communications Company L. P. System for managing telecommunications
WO1995031057A1 (en) 1994-05-05 1995-11-16 Sprint Communications Company, L.P. Method, system and apparatus for telecommunications control
IT1266895B1 (en) * 1994-07-26 1997-01-21 Cselt Centro Studi Lab Telecom PROCEDURE FOR THE OPTIMUM ALLOCATION OF RESOURCES FOR THE TRANSPORT OF VARIABLE BAND INFORMATION FLOWS ON NETWORKS IN ATM TECHNIQUE, AND NODE
IL110657A (en) * 1994-08-14 1997-07-13 Ornet Data Communication Techn Network switch
US5519700A (en) * 1994-12-07 1996-05-21 At&T Corp. Telecommunication system with synchronous-asynchronous interface
US5513174A (en) * 1994-12-07 1996-04-30 At&T Corp. Telecommunication system with detection and control of packet collisions
US5841771A (en) * 1995-07-07 1998-11-24 Northern Telecom Limited Telecommunications switch apparatus and method for time switching
EP1052813A1 (en) * 1995-07-07 2000-11-15 Nortel Networks Limited Telecommunications apparatus and method
US5862136A (en) * 1995-07-07 1999-01-19 Northern Telecom Limited Telecommunications apparatus and method
US5745486A (en) * 1995-10-26 1998-04-28 Northern Telecom Limited High capacity ATM switch
SE508050C2 (en) * 1995-11-09 1998-08-17 Ericsson Telefon Ab L M Device and method of packet delivery
US5903774A (en) * 1995-11-13 1999-05-11 Intel Corporation External network network interface device without interim storage connected to high-speed serial bus with low latency and high transmission rate
WO1997028622A1 (en) * 1996-02-02 1997-08-07 Sprint Communications Company, L.P. Atm gateway system
US5898830A (en) * 1996-10-17 1999-04-27 Network Engineering Software Firewall providing enhanced network security and user transparency
US5826014A (en) * 1996-02-06 1998-10-20 Network Engineering Software Firewall system for protecting network elements connected to a public network
US5870550A (en) * 1996-02-26 1999-02-09 Network Engineering Software Web server employing multi-homed, moldular framework
US8117298B1 (en) 1996-02-26 2012-02-14 Graphon Corporation Multi-homed web server
US6178169B1 (en) 1996-03-28 2001-01-23 British Telecommunications Public Limited Company Method of transmitting an ATM cell over an ATM network
US5940393A (en) * 1996-05-28 1999-08-17 Sprint Communications Co. L.P. Telecommunications system with a connection processing system
US6014378A (en) 1996-11-22 2000-01-11 Sprint Communications Company, L.P. Telecommunications tandem system for circuit-based traffic
BR9713283A (en) 1996-11-22 1999-10-26 Sprint Communications Co System and method for transporting a call on a telecommunications network
US6115380A (en) * 1996-11-22 2000-09-05 Sprint Communications Co., L.P. Broadband telecommunications system
US6002689A (en) * 1996-11-22 1999-12-14 Sprint Communications Co. L.P. System and method for interfacing a local communication device
US6493347B2 (en) * 1996-12-16 2002-12-10 Juniper Networks, Inc. Memory organization in a switching device
US6067299A (en) * 1997-04-16 2000-05-23 Sprint Communications Company, L.P. Communications system for providing ATM connections and echo cancellation
US6704327B1 (en) 1997-05-09 2004-03-09 Sprint Communications Company, L.P. System and method for connecting a call
US6137800A (en) * 1997-05-09 2000-10-24 Sprint Communications Company, L. P. System and method for connecting a call
US6178170B1 (en) 1997-05-13 2001-01-23 Sprint Communications Company, L. P. System and method for transporting a call
KR100290999B1 (en) 1997-06-11 2001-07-12 윤종용 Atm(asynchronous transfer mode)switching device and method for voice service
US6094430A (en) * 1997-09-24 2000-07-25 Xylan Corporation Switching fabric for a digital traffic switch
FR2771573B1 (en) * 1997-11-27 2001-10-19 Alsthom Cge Alkatel PACKET SWITCHING ELEMENT WITH BUFFER MEMORIES
US6563918B1 (en) 1998-02-20 2003-05-13 Sprint Communications Company, LP Telecommunications system architecture for connecting a call
US6483837B1 (en) 1998-02-20 2002-11-19 Sprint Communications Company L.P. System and method for connecting a call with an interworking system
US6546022B1 (en) 1998-04-03 2003-04-08 Sprint Communications Company, L.P. Method, system and apparatus for processing information in a telecommunications system
US6307852B1 (en) * 1998-04-09 2001-10-23 Nortel Networks Limited Rotator switch data path structures
US20030081548A1 (en) * 1998-04-09 2003-05-01 Michel Langevin Scheduling method for inputbuffer switch architecture
US6160871A (en) 1998-04-10 2000-12-12 Sprint Communications Company, L.P. Communications test system
US6351466B1 (en) * 1998-05-01 2002-02-26 Hewlett-Packard Company Switching systems and methods of operation of switching systems
US6028867A (en) * 1998-06-15 2000-02-22 Covad Communications Group, Inc. System, method, and network for providing high speed remote access from any location connected by a local loop to a central office
ITTO980529A1 (en) * 1998-06-19 1999-12-19 Alsthom Cge Alcatel CONNECTION MATRIX BETWEEN TAXES OF A TELECOMMUNICATIONS NETWORK AND RELATED MANAGEMENT METHOD.
US6590900B1 (en) 1998-12-16 2003-07-08 Pmc-Sierra Ltd. Time and space sliced non-blocking network switching fabric
US6381247B1 (en) 1998-12-17 2002-04-30 Nortel Networks Limited Service independent switch interface
US6587431B1 (en) * 1998-12-18 2003-07-01 Nortel Networks Limited Supertrunking for packet switching
US6510135B1 (en) * 1998-12-18 2003-01-21 Nortel Networks Limited Flow-level demultiplexing within routers
US6574230B1 (en) 1998-12-18 2003-06-03 Nortel Networks Limited Scheduling technique for delayed queue service
US6785282B1 (en) 1998-12-22 2004-08-31 Sprint Communications Company L.P. System and method for connecting a call with a gateway system
US6724765B1 (en) 1998-12-22 2004-04-20 Sprint Communications Company, L.P. Telecommunication call processing and connection system architecture
US6982950B1 (en) 1998-12-22 2006-01-03 Sprint Communications Company L.P. System and method for connecting a call in a tandem architecture
US6888833B1 (en) 1998-12-22 2005-05-03 Sprint Communications Company L.P. System and method for processing call signaling
US6856627B2 (en) 1999-01-15 2005-02-15 Cisco Technology, Inc. Method for routing information over a network
US6934305B1 (en) 1999-01-15 2005-08-23 Cisco Technology, Inc. Method and apparatus for detecting errors in a backplane frame
US6724757B1 (en) * 1999-01-15 2004-04-20 Cisco Technology, Inc. Configurable network router
US6982974B1 (en) * 1999-01-15 2006-01-03 Cisco Technology, Inc. Method and apparatus for a rearrangeably non-blocking switching matrix
US7293090B1 (en) 1999-01-15 2007-11-06 Cisco Technology, Inc. Resource management protocol for a configurable network router
US6853647B1 (en) 1999-02-17 2005-02-08 Covad Communications Group, Inc. System method and network for providing high speed remote access from any location connected by a local loop to a central office
US6934471B1 (en) 1999-06-03 2005-08-23 Avici Systems, Inc. Photonic switch using time-slot interchange
US6473397B1 (en) 1999-08-10 2002-10-29 Nortel Networks Limited Add/drop multiplexer and method, and Bi-directional line switcher ring featuring such multiplexers
CA2283627C (en) * 1999-09-27 2008-08-12 Nortel Networks Corporation High-capacity wdm-tdm packet switch
DE19961269A1 (en) * 1999-12-18 2001-06-21 Alcatel Sa Network node for conveying digital information of different types of protocol
JP3522619B2 (en) * 2000-01-05 2004-04-26 株式会社エヌ・ティ・ティ・ドコモ Transmitter in multi-carrier CDMA transmission system
US7012895B1 (en) 2000-11-17 2006-03-14 University Of Kentucky Research Foundation Packet-switching network with symmetrical topology and method of routing packets
US7209659B2 (en) * 2000-12-19 2007-04-24 Nortel Networks Limited Modular high capacity network
EP1397011B1 (en) * 2001-03-01 2008-09-17 Mitsubishi Denki Kabushiki Kaisha Mobile ip packet communication system
WO2002093843A1 (en) * 2001-05-14 2002-11-21 Opera Systems Limited Router
US7184431B2 (en) * 2001-09-18 2007-02-27 Nortel Networks Limited Rotator communication switch having redundant elements
US7082132B1 (en) 2001-12-26 2006-07-25 Nortel Networks Limited Universal edge node
US7394806B2 (en) * 2002-04-11 2008-07-01 Nortel Networks Limited Distributed space-time-space switch
US20040037558A1 (en) * 2002-08-20 2004-02-26 Nortel Networks Limited Modular high-capacity switch
CA2706654C (en) * 2003-02-20 2014-01-28 Nortel Networks Limited Circulating switch
ATE360329T1 (en) * 2003-05-14 2007-05-15 Koninkl Philips Electronics Nv TIME MULTIPLEX LINE SWITCHING ROUTER
US7545804B2 (en) * 2003-09-11 2009-06-09 Nortel Networks Limited High throughput rotator switch having excess tandem buffers
US7450575B2 (en) * 2004-02-17 2008-11-11 Nec Electronics Corporation Low redundancy data RAM architecture for monolithic time-space switches
US7602771B1 (en) 2004-12-30 2009-10-13 Nortel Networks Limited Two-dimensional circulating switch
US20100128734A1 (en) * 2004-02-19 2010-05-27 Beshai Maged E Polyphase rotating-access switch
US7639678B2 (en) * 2004-12-02 2009-12-29 Nortel Networks Limited Multimodal data switch
US7539181B2 (en) * 2004-12-13 2009-05-26 Nortel Networks Limited Balanced bufferless switch
US7965725B2 (en) * 2005-05-31 2011-06-21 Stmicroelectronics, Inc. Hyper-ring-on-chip (HyRoC) architecture
US7978690B2 (en) * 2007-03-31 2011-07-12 International Business Machines Corporation Method to operate a crossbar switch
US9219697B2 (en) 2009-08-27 2015-12-22 Maged E. Beshai Multiple petabit-per-second switching system employing latent switches
US9252909B2 (en) 2009-08-27 2016-02-02 Maged E. Beshai Single-rotator latent space switch with an embedded controller
US9154255B2 (en) * 2009-08-27 2015-10-06 Maged E. Beshai Single-rotator latent space switch with an external controller
US8971340B2 (en) * 2009-08-27 2015-03-03 Maged E. Beshai Latent space switch using a single transposing rotator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470139A (en) * 1981-12-28 1984-09-04 Northern Telecom Limited Switching network for use in a time division multiplex system
GB8701009D0 (en) * 1987-01-19 1987-02-18 Inmos Ltd Digital signal switch
FR2611411B1 (en) * 1987-02-27 1989-04-21 Francois Joel HYBRID TIME MULTIPLEX SWITCHING SYSTEM
FR2618624B1 (en) * 1987-07-24 1992-04-30 Michel Servel HYBRID TIME MULTIPLEX SWITCHING SYSTEM WITH OPTIMIZED BUFFER MEMORY
FR2625392B1 (en) * 1987-12-24 1993-11-26 Quinquis Jean Paul CIRCUIT FOR MANAGING BUFFER WRITE POINTERS IN PARTICULAR FOR SELF-ROUTING PACKET TIME SWITCH

Also Published As

Publication number Publication date
JP3023732B2 (en) 2000-03-21
US5168492A (en) 1992-12-01
CA2061850C (en) 1994-08-02
JPH0621966A (en) 1994-01-28

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