WO2002017546A2 - Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm) - Google Patents

Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm) Download PDF

Info

Publication number
WO2002017546A2
WO2002017546A2 PCT/US2001/026557 US0126557W WO0217546A2 WO 2002017546 A2 WO2002017546 A2 WO 2002017546A2 US 0126557 W US0126557 W US 0126557W WO 0217546 A2 WO0217546 A2 WO 0217546A2
Authority
WO
WIPO (PCT)
Prior art keywords
nxsts
sts
pipe
nxvt
sonet
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.)
Ceased
Application number
PCT/US2001/026557
Other languages
English (en)
Other versions
WO2002017546A3 (fr
Inventor
Gordon Lee
Kevin Huang
Wen-Lung Chen
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.)
GEYSER NETWORKS Inc
Original Assignee
GEYSER NETWORKS 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 GEYSER NETWORKS Inc filed Critical GEYSER NETWORKS Inc
Priority to AU2001286758A priority Critical patent/AU2001286758A1/en
Publication of WO2002017546A2 publication Critical patent/WO2002017546A2/fr
Publication of WO2002017546A3 publication Critical patent/WO2002017546A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • 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
    • 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
    • H04J2203/0005—Switching elements
    • 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
    • H04J2203/0005—Switching elements
    • H04J2203/0008—Time switch details
    • 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
    • H04J2203/0028—Local loop
    • H04J2203/0039—Topology
    • H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • 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
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0075—Connection-oriented
    • 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
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6424—Access arrangements

Definitions

  • the present invention relates to optical networks. More particularly, the invention relates to a system and method of virtually concatenating VT1.5s and STS-ls over SONET and SDH and WDM. BACKGROUND OF THE INVENTION
  • Multiprotocol Label Switching Architecture IETF Draft Document. August, 1999 and http://www.ietf.org/intemet-drafts/draft-ietf-mpls-arch-06.txt.). This work allows network devices to employ a standards-based method by which packet traffic can traverse a network, while receiving a previously agreed upon Quality of Service.
  • VT1.5 and a TU-11 or TU-12 can only be concatenated into a STS-1 and a STM-0 or a STM-1, respectively, with a minimum granularity of 51 megabits per second (Mbps).
  • VT1.5s and TU-1 Is or TU-12s require pointer adjustment, which is costly mechanically complex, and difficult to implement.
  • bandwidth of connections can only be adjusted via software, in a non-real time manner.
  • standard SONET's GR-253 allows for 4 frames per multiple-frame.
  • the GR-253 VT1.5 virtual tributary structure uses bytes interleaved with 3 separate columns for one Tl mapping.
  • the present invention provides a system and method of virtually concatenating VT1.5s and STS-ls over SONET and SDH and WDM.
  • the system and method includes (1) creating a nxSTS-1 virtually concatenated pipe out of STS-ls, (2) within the nxSTS-1 pipe, forming one or more nxVT pipes out of VTs, and (3) mapping an application to a nxVT pipe or a nxSTS-1 pipe based upon a service level agreement.
  • the creating includes (a) terminating SONET framing, (b) processing pointers, and (c) compensating for delay, thereby aligning the STS-ls in the nxSTS-1 virtually concatenated pipe.
  • the forming includes (a) processing VT overhead of the VTs and (b) mapping traffic to nxVT pipes or nxSTS-1 pipes according to a connection identification.
  • the mapping includes (a) processing traffic and (b) mapping traffic to a nxVT pipe or a nxSTS-1 pipe based upon the service level agreement.
  • the present invention provides for the virtual concatenation of a VT 1.5 and a TU-11 or TU-12 a granularity of a VT1.5 and a TU-11 or TU-12, respectively, does not require pointer adjustment, and supports real-time dynamic bandwidth allocation.
  • Figures 1A, IB, and 1C illustrate prior art details of standard SONET and SDH.
  • Figure 2 illustrates nxSTS-1 and nxVT virtual concatenation in accordance with an exemplary embodiment of the present invention.
  • Figure 3 illustrates a SONET STS-1 path ring in accordance with an exemplary embodiment of the present invention.
  • Figure 4 illustrates a nxSTS-1 system with STS-ls going through different routes in a public network in accordance with an exemplary embodiment of the present invention.
  • Figure 5 illustrates a STS-1 superframe or framing structure in accordance with an exemplary embodiment of the present invention.
  • the present invention provides a system and method of virtually concatenating VT1.5s and STS-ls over SONET and SDH and WDM.
  • the present invention allows users to setup connections or pipes with configurable bandwidth over either nxSTS-l/nxAU-3/nxAU-4 or nxVT1.5/nxTU-l 1/nxTU- 12 within a nxSTS-l/nxAU-3/nxAU-4 pipe on an existing SONET/SDH network.
  • This provides a connection or pipe of adjustable bandwidth with a granularity of close to 1.5 Mbps to fit the needs of applications.
  • the resulting connection can be treated as a TDM like connection.
  • a dynamic bandwidth allocation (DBA) protocol which is described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, allows for dynamically changing the throughput of all nxVT connections, based on the real-time traffic loads of applications using the nxVT connections.
  • the DBA protocol allows for the efficient use of the SONET/SDH bandwidth through statistical multiplexing.
  • the same dynamic bandwidth allocation protocol applies to nxSTS-1 and nxAU-3/nxAU-4.
  • the present invention provides for virtual concatenation, which includes creating a logical connection or pipe by combining multiple, n (where n is a positive integer), STS-1 or VT connections or pipes, which may be contiguous or non-contiguous, into a single connection or pipe, nxSTS-1 or nxVT, respectively, in order to support a connection or pipe with a higher throughput than the throughput of the original STS-1 or VT pipes.
  • Geyser nxSTS-1 and nxVT virtual concatenation Referring to Figure 2, the present invention provides for the following two kinds of "virtual concatenated" connections: (1) a nxSTS-1 210, 220, 230; and (2) a nxVT 214, 216, 218.
  • nxSTS-1 210, 220, 230 is formed from (a) multiple STS-ls residing in a single or multiple OC-n (OC-3, 12, 48, 192, etc.) interface(s) or (b) multiple ⁇ in a DWDM system or (c) multiple fiber cable.
  • the STS-ls may be scattered over multiple wavelengths or interfaces or may reside in the same fiber or different fibers.
  • the STS-ls may be randomly picked from the OC-n interfaces or ⁇ or fiber to form nxSTS-1 pipe 210, 220, 230.
  • the STS-ls may be contiguous or non- contiguous.
  • Multiple nxSTS-ls 210, 220, 230 can be setup in the same SONET or SDH system.
  • nxVT 214, 216, 218 is formed with multiple VTs 212 in a single nxSTS-1 pipe 210. Again, the VTs 212 do not need to be contiguous. Any sets of VTs inside the nxSTS-1 pipe 210 may be used to form an nxVT connection 214, 216, 218. nxVT 214, 216, 218 may be formed across STS-ls within the same nxSTS-1 210. Multiple nxVTs 214, 216, 218 may be setup in one nxSTS-1 connection 210.
  • nxSTS-ls 210, 220, 230 may be formed, where each nxSTS-1 210, 220, 230 may support one or more nxVT connections 214, 216, 218 within the nxSTS- 1.
  • each nxVT 214, 216, 218 cannot be formed across multiple nxSTS-ls 210, 220, 230.
  • a STS-1 is logically broken up with a granularity of one VT.
  • a connection may be made with, at a minimum, one VT.
  • a connection may be made with one STS-1.
  • nxSTS-1 210, 220, 230 may be used as a single connection or pipe for an application 222, 232 or (b) may consist of many nxVTs 214, 216, 218 where each nxVT 214, 216, 218 may be used as a connection or pipe for an application 215, 217, 219, respectively.
  • the resulting connection may be a TDM, Packet based, or ATM based connection.
  • the number, n, of VTs 212 or STS-ls used for a connection is selected to fit the bandwidth required by application using the connection.
  • a 10 Mbps Ethernet application may need a 6xVT connection to accommodate its throughput, while a MPEG application may need al 7xVT connection.
  • the present invention places no limit on the number, n, of STS-ls that may be used to form an nxSTS-1 pipe 210, 220, 230.
  • the number, n, of VTs 212 used to form nxVT connection 214, 216, 218 is limited by nxSTS-1 210.
  • nxVT connection 214, 216, 218 In a packet or ATM based connection, the bandwidth usage depends on the actual traffic pattern. Usually the data packet traffic can be very bursty. Assigning a fixed value of n for nxVT connection 214, 216, 218 may not be optimal. A more optimal solution is to dynamically adjust the value of n, and therefore the bandwidth of the connection, based on the real traffic load running in the pipe.
  • nxSTS-1 210, 220, 230 and nxVT 214, 216, 218 are based on the SONET path layer running as a ring 300.
  • Figure 3 shows the nxSTS-1 ring implementation 300.
  • Path ring 300 includes nodes 310, 320, 330, and 340. In Figure 3, all nodes 310, 320, 330, and 340 use a common synchronized timing, either bits clock or recovered clock, in order to avoid delay compensation buffer overflow or underflow.
  • Nodes 310, 320, 330, and 340 include pointer processing (PP) buffers 314, 315, 324, 325, 334, 335, and 344, 345, respectively.
  • Nodes 310, 320, 330, and 340 also include delay compensators (DC) 312, 322, 332, and 342, respectively.
  • node 310 is a SONET framing termination node.
  • node 320 is a delay compensation node performing Jl alignment.
  • Node 320 makes Jl aligned to compensate the Jl delay among STS- 1 s caused by PP XMT and RC V buffer (i.e. pointer adjustment).
  • Node 320 can freely generate SJ1/J1/H4.
  • node 330 is a delay compensation node performing SJ and H4 termination.
  • Node 330 writes from PP buffer 334 to a SJ1 byte of DC 332 according to a received SPE.
  • Node 330 also includes (1) a free running SJl/Jl/SPE module 338, (2) a SJ node internal system clock 339, which inputs to free running SJl/Jl/SPE module 338, and (3) a H4 coding module 336 .
  • Node 330 reads out from the SJ1 byte of DC 332 using a freely generated SPE from free running SJl/Jl/SPE module 338.
  • node 340 is a delay compensation node performing multiple frame alignment.
  • DC 342 includes a Jl byte with a maximum delay.
  • node 340 receives STS-ls from a first network input 346 and STS-ls from a second network input 348.
  • only one node includes system clock 339.
  • only one node includes free running SJl/Jl/SPE module 338, thereby minimizing delay.
  • at least one node may include a free running SJl/Jl/SPE module.
  • only one node includes H4 coding module 336.
  • At least one nodes may include a H4 coding module.
  • every node 310, 320, 330, 340 maps to or de-maps from path layer framing structure 300.
  • at least one of the nodes e.g. node 330, acts as a master node to provide the timing information for everyone else. If the master timing were not available, every node would try to follow the timing received from its previous node. Since it is a ring topology, this would lead to an infinite loop, and the timing would become unstable.
  • the present invention avoids this kind of dead loop of framing and timing by having a master node 330.
  • master node 330 In ring topology 300, master node 330 generates the following timings: (a) super frame pulse SJ1/J1, where Jl marks the 1st byte of SONET-SPE, via free running SJl/Jl/SPE module 338; and (b) the Frame sequence number H4, via H4 coding module 336.
  • super frame pulse SJ1/J1 where Jl marks the 1st byte of SONET-SPE, via free running SJl/Jl/SPE module 338
  • the Frame sequence number H4 via H4 coding module 336.
  • nxSTS-1 210, 220, 230 has an 8 SONET frames based super frame structure.
  • one super frame consists of 8 SONET frames.
  • the start of a super frame is represented by a SJ1 pulse.
  • SJ1 is the position of the first Jl in one super frame.
  • master node 330 generates a SJ1 pulse and the Jl pulse freely via free running SJl/Jl/SPE module 338 and with input from free running clock 339. Once this timing is generated, all other nodes 310, 320, and 340 receive SJ1/J1 from its previous node and perform pointer adjustment based on the incoming SJ1/J1. Eventually this SJl pulse is propagated across the whole ring 300 and sent back to master node 330. In an exemplary embodiment, due to the delay/pointer processing in each node, master node 330 receives an incoming SJl different from the freely generated SJl from free running SJl/Jl/SPE module 338 at the transmitting side.
  • Master node 330 compensates for the difference between incoming SJl and the freely generated SJl by buffering all the data between the two timings. In this way, master node 330 compensates and ensures that the payload delay across ring 300 is a multiple of super-frame delay, thereby resulting in stable timing.
  • ring 300 is stable only when the total ring delay is equal to the time of n x super frame, where n is a positive integer.
  • the generation of Jl and SJl may be performed in different nodes.
  • the generation of Jl and SJl is performed in the same node 330.
  • SJl generation may cover Jl generation, and therefore, only SJl generation may needed in
  • a sequence number of 8 bits is put at the STS-1 H4 byte overhead, which serves two purposes.
  • the SJl may be embedded in the H4 byte.
  • the SJl is the first Jl of the super-frame.
  • the super-frame will carry 8 SONET frames with H4 sequence number 0, 1, 2, 3, ..., 255.
  • master node 330 re-generating J1/SJ1 will generate the H4 code also, via H4 coding module 336.
  • the H4 sequence number is used to specify the delay of each STS-1 when they go through different routes.
  • the H4 byte is used to specify an 8-bit sequence number, which can differentiate up to 256 SONET frames, or equivalently 32 msec. This allows for a delay compensation of up to 16 msec.
  • H4 coding method may be used instead of a flat coding.
  • Figure 4 shows a nxSTS-1 system 400 with STS-ls going through different routes in a public network in accordance with an exemplary embodiment of the present invention.
  • System 400 includes nodes 420 and 430, routers 440 and 442, and public networks 410 and 450, logically interconnected as shown in Figure 4.
  • Nodes 420 and 430 are examples of node 340 from Figure 3.
  • Public networks 410 and 450 may be a SONET or SDH or DWDM network.
  • node 430 combines network inputs 346 and 348.
  • the virtual concatenated STS-ls' SJl/Jls are aligned at every node 310, 320, 330, 340, 420, 430 in order for packet to map or de-map correctly.
  • the present invention provides for the following three kinds of delay compensation: (1) pointer processor buffer delay compensation; (2) super frame termination delay compensation; and (3) configured maximum SONET framing delay compensation.
  • a downstream node e.g. node 320
  • the transmitter pointer processor e.g. PP 314
  • the receiver pointer processor e.g. PP 324
  • Each of the nodes 310, 320, 330, 340 only introduces minimal additional latency to compensate the pointer adjustment delay, which is in the worst of 2 times of the Pointer_Processor_buffer_size delay.
  • only one master node 330 in ring 300 exists and compensates the whole ring delay to be a multiple of super-frame delay.
  • master node 330 needs to keep a stable and synchronized SJl pulse. Master node 330 attempts to buffer all of the data in a nxSTS-1 payload such that the relative difference between the received SJl pulse and the locally generated SJl pulse from module 338 remains fixed. This is equivalent to doing a delay compensation such that the whole ring delay is exactly an integer multiple of the super-frame delay. In this way, the received data in the nxSTS-1 payload can be safely passed to the next node without buffer overflow or under flow. Configured Maximum SONET Framing Delay Compensation
  • some STS-ls may go through a different route or fiber or ⁇ in a network from other STS-ls.
  • the delay of each STS-1 route can be different and each STS-1 can be floating in OC-n (where n is an integer) signal or WDM networks. This is especially true when the STS-ls go through different public networks 410 and 450 as shown in Figure 4.
  • the delay variations among all the STS-ls are much higher when the traffic is going through public networks 410 and 450.
  • the H4 byte is used to carry an 8-bit sequence number. The sequence number will cover up to 256 SONET frames. It allows the node to compensate for a delay of plus or minus 16 msec. In order to cover even larger delay variations, more bytes of overhead or hierarchy H4 coding recommended in the ITU-T standard may be used.
  • STS-1 superframe or framing structure 500 in accordance with an exemplary embodiment of the present invention is shown.
  • the present invention's STS-1 framing structure supports the nxSTS-1 and nxVT virtual concatenation shown in Figure 2.
  • STS-1 framing structure 500 is compatible with GR-253 in STS-1 frames.
  • STS-1 framing structure 500 may pass safely through the standard SONET networking environment.
  • the present invention provides the following two additions: (1) a super- frame (SFRM) 500; and (2) a virtual tributary structure.
  • STS-1 Super-Frame STS-1 super-frame (SFRM) 500 consists of 8 STS-1 frames, as , compared with GR-253's 4 frames per multiple-frame.
  • STS-1 super-frame (SFRM) 500 one STS-1 SPE has a total of 87(column) x 9 (row) x 8 (frame) bytes.
  • the STS-1 overhead is defined to be the same as GR-253 to maintain compatibility.
  • the two fix stuffed columns 550 and 552 remain the same but may be optionally used for data payload.
  • Super-frame structure 500 may also apply to super-frames that consist of n frames, where n is a positive integer.
  • a virtual tributary (VT) structure 510 is defined differently from the standard SONET GR-253 VTl .5 structure.
  • the GR-253 VTl.5 virtual tributary structure uses bytes interleaved with 3 separate columns for one Tl mapping.
  • virtual tributary structure 510 is provided which uses a word interleaved multiplexing scheme.
  • the format of the present invention's SFRM structure for VT is shown in Figure 5.
  • one word of VT is mapped to one slot within a STS-1 super-frame.
  • the first row and the second 1/3 row within one super-frame carry the overhead byte for 28 VTl.5s.
  • Each VTl.5 in one super frame has an overhead of one word (4 bytes) and a payload of 212 bytes.
  • the payload slots start from the second 1/3 row of second row.
  • the present invention's word interleaved virtual tributary is abbreviated as VT.
  • VTl.5 overhead can be distributed in any location of the super-frame.
  • STS-1 superframe 500 includes 28 slots for 28 VTs. Each VT includes 53 words. In Figure 5, a sloti ⁇ ] refers to the ith VT and the jth word in the VT, where i is between 1 and 28 and j is between 1 and 53. STS-1 superframe 500 is 1000 ⁇ s in duration.
  • the path overhead bytes of a SONET STS-1 are stored in path overhead 520.
  • P, Q, U, and V bytes, as described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, of a VT.15 are stored in bytes 530.
  • the payload of the 1st VT1.5 is stored in slotl[l] (slot 1, word 1) 540 to slotl[53] (slot 1, word 53) 542, as shown in Figure 5.
  • the ith VTl.5 is stored in sloti[l] (slot i, word 1) to sloti[53] (slot i, word 53).
  • STS-1 Superframe and Virtual Tributary Structure STS-1 superframe 500 and virtual tributary structure 510 has several important features.
  • the virtual tributary payload overhead 520 is largely decreased.
  • the present invention's payload per VT is 1.696 Mbps as compared with the standard SONET GR-253's payload per VT of 1.6 Mbps.
  • super-frame 500 of 8 frames allows for each virtual tributary payload 510 to carry exactly 4 ATM cells. Whenever an ATM cell is mapped onto the present invention's VT tributary 510, the ATM cell boundary is aligned with the super-frame boundary. In this case, the present invention allows for the easy transmission or reception of ATM cells without the need of either implementing ATM cell delineation or additional coding such as HDLC.
  • the byte interleaving based standard SONET stream was defined for 8-bit wide data path.
  • the throughput gets higher, it's mandatory to use a wider data path in the design to support the higher data rate.
  • the present invention makes it very easy to match between the VT data stream and the internal data path. No additional memory or conversion is needed.
  • the present invention relates to optical networks. More particularly, the invention relates to a system and method of virtually concatenating VTl .5s and STS-ls over SONET and SDH and WDM.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un système et un procédé de concaténation de VT1,5s et STS-1S, sur un réseau optique synchrone (SONET), sur un réseau hiérarchique numérique synchrone et sur un réseau à multiplexage de longueurs d'ondes. Dans un mode de réalisation, le système et le procédé consistent (1) à créer un canal nxSTS-1 virtuellement concaténé, (2) à former, dans ce canal nxSTS-1, un ou plusieurs canaux nxVT à partir des VT, et (3) à faire correspondre une application à un canal nxVT ou à un canal nxSTS-1, d'après un accord de niveau de service. Dans ce système et ce procédé, la création consiste (a) à achever l'encadrement du réseau SONET, (b) à traiter des pointeurs, et (c) à compenser le retard, de manière à aligner STS-1s dans le canal nxSTS-1 virtuellement concaténé, et la formation consiste (a) à traiter le surdébit VT des VT et (b) à faire correspondre le trafic aux canaux nxVT ou aux canaux nxSTS-1 en fonction d'une identification de connexion.
PCT/US2001/026557 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm) Ceased WO2002017546A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001286758A AU2001286758A1 (en) 2000-08-23 2001-08-23 System and method of virtually concatenating vt1.5s ans sts-1s over sonet and sdh and wdm

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22800800P 2000-08-23 2000-08-23
US60/228,008 2000-08-23
US27279301P 2001-03-01 2001-03-01
US60/272,793 2001-03-01

Publications (2)

Publication Number Publication Date
WO2002017546A2 true WO2002017546A2 (fr) 2002-02-28
WO2002017546A3 WO2002017546A3 (fr) 2002-08-01

Family

ID=26921978

Family Applications (6)

Application Number Title Priority Date Filing Date
PCT/US2001/026534 Ceased WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns
PCT/US2001/026557 Ceased WO2002017546A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
PCT/US2001/026567 Ceased WO2002017580A1 (fr) 2000-08-23 2001-08-23 Architecture de commutation double, destinee aux transports par paquets/circuits melanges sur reseau optique synchrone(sonet)/reseau hierarchique numerique synchrone(sdh)/reseau de multiplexage en longueur d'onde dense(dwdm)
PCT/US2001/026535 Ceased WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026542 Ceased WO2002017545A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
PCT/US2001/026533 Ceased WO2002017542A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2001/026534 Ceased WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns

Family Applications After (4)

Application Number Title Priority Date Filing Date
PCT/US2001/026567 Ceased WO2002017580A1 (fr) 2000-08-23 2001-08-23 Architecture de commutation double, destinee aux transports par paquets/circuits melanges sur reseau optique synchrone(sonet)/reseau hierarchique numerique synchrone(sdh)/reseau de multiplexage en longueur d'onde dense(dwdm)
PCT/US2001/026535 Ceased WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026542 Ceased WO2002017545A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
PCT/US2001/026533 Ceased WO2002017542A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle

Country Status (2)

Country Link
AU (6) AU2001290570A1 (fr)
WO (6) WO2002017543A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150229423A1 (en) * 2014-02-12 2015-08-13 Tellabs Operations, Inc. Procedure, apparatus, and computer program for reducing a probability of fragmentation when supporting virtual concatenation (vcat) services

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1254054C (zh) * 2002-12-26 2006-04-26 华为技术有限公司 一种光网络中建立双向标签交换路径的方法
CN1310473C (zh) * 2003-01-07 2007-04-11 华为技术有限公司 基于同步数字传送网的数据传送方法
CN100484054C (zh) 2003-01-28 2009-04-29 华为技术有限公司 数字传送网上不同的数据帧接入和传送的系统和方法
CN100440824C (zh) * 2003-01-28 2008-12-03 华为技术有限公司 数字传送网上不同的数据帧接入和传送的方法
EP1545080B1 (fr) * 2003-12-19 2007-05-30 Alcatel Lucent Procédé pour transférer une trame pour multiplexage à répartition dans le temps, sur un réseau MPLS
DE602005006521D1 (de) 2005-03-09 2008-06-19 Nokia Siemens Networks Gmbh Hybrides digitales Koppelfeld zur Vermittlung von Leitungs- und paketbasierten Datenströmen
CN101127628B (zh) * 2006-08-14 2010-07-21 华为技术有限公司 一种管理和传送细粒度业务的方法和装置
JP2008306478A (ja) * 2007-06-07 2008-12-18 Nec Corp データ転送装置、データ転送方法及びデータ転送プログラム
GB2465589A (en) * 2008-11-24 2010-05-26 George Tsirakakis Integrated Multilayer Network Restoration using Hybrid Network Elements.
KR101401752B1 (ko) 2010-05-06 2014-05-30 엘에스산전 주식회사 링 네트워크에서의 링 매니저 선출 방법 및 노드
KR102239110B1 (ko) 2014-06-27 2021-04-13 삼성전자주식회사 통신 서비스 운용 방법 및 전자 장치

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731785A (en) * 1986-06-20 1988-03-15 American Telephone And Telegraph Company Combined circuit switch and packet switching system
JPH05183530A (ja) * 1991-06-06 1993-07-23 Fujitsu Ltd 同期ペイロードポインタ処理方式
US5315594A (en) * 1992-03-02 1994-05-24 Alcatel Network Systems, Inc. Inter-network transport element of sonet overhead
US5784377A (en) * 1993-03-09 1998-07-21 Hubbell Incorporated Integrated digital loop carrier system with virtual tributary mapper circuit
US5579323A (en) * 1994-07-22 1996-11-26 Alcatel Network Systems, Inc. Virtual tributary/tributary unit transport method and apparatus
JP3264803B2 (ja) * 1995-09-25 2002-03-11 富士通株式会社 固定長セルをサポートしたアド・ドロップ多重化装置
JP3419627B2 (ja) * 1996-06-11 2003-06-23 株式会社日立製作所 ルータ装置
JP3581765B2 (ja) * 1996-09-20 2004-10-27 株式会社日立コミュニケーションテクノロジー 複合リング形ネットワークシステムにおけるパス切替方法及び装置
US6148000A (en) * 1996-10-02 2000-11-14 International Business Machines Corporation Merging of data cells at network nodes
US6011802A (en) * 1996-10-22 2000-01-04 Sprint Communications Co. L.P. Method and system for conversion and transmission of communication signals
JP3425046B2 (ja) * 1996-11-29 2003-07-07 富士通株式会社 受信ポインタ処理装置
US6044088A (en) * 1997-09-30 2000-03-28 Alcatel Usa Sourcing, L.P. System and circuit for telecommunications data conversion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150229423A1 (en) * 2014-02-12 2015-08-13 Tellabs Operations, Inc. Procedure, apparatus, and computer program for reducing a probability of fragmentation when supporting virtual concatenation (vcat) services
US9350563B2 (en) * 2014-02-12 2016-05-24 Coriant Operations, Inc. Procedure, apparatus, and computer program for reducing a probability of fragmentation when supporting virtual concatenation (VCAT) services

Also Published As

Publication number Publication date
WO2002017545A3 (fr) 2002-05-30
WO2002017544A2 (fr) 2002-02-28
WO2002017542A2 (fr) 2002-02-28
WO2002017546A3 (fr) 2002-08-01
WO2002017543A2 (fr) 2002-02-28
WO2002017544A3 (fr) 2002-05-16
WO2002017543A3 (fr) 2002-05-30
AU2001288406A1 (en) 2002-03-04
WO2002017580A1 (fr) 2002-02-28
AU2001286758A1 (en) 2002-03-04
AU2001290570A1 (en) 2002-03-04
WO2002017542A3 (fr) 2002-05-16
AU2001288398A1 (en) 2002-03-04
AU2001288396A1 (en) 2002-03-04
AU2001288397A1 (en) 2002-03-04
WO2002017545A2 (fr) 2002-02-28

Similar Documents

Publication Publication Date Title
JP4530385B2 (ja) Ｓｏｎｅｔに任意の信号をマッピングする方法
US7961755B2 (en) Efficient transport of TDM services over packet networks
US8571062B1 (en) Multichannel data conversion into packets
US7130276B2 (en) Hybrid time division multiplexing and data transport
US7133415B2 (en) SONET circuit emulation with VT compression
US7031256B2 (en) Methods and apparatus for implementing LCAS ( link capacity adjustment scheme) sinking with rate based flow control
WO2002017546A2 (fr) Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
EP0788696A1 (fr) Procede d'etablissement d'une interface de reseau et interface de reseau pour reseau de transmission numerique
WO2008106888A1 (fr) Réseau sdh/sonet convergent
US7353288B1 (en) SONET/SDH payload re-mapping and cross-connect
US6836486B2 (en) Switching of low order data structures using a high order switch
US7672315B2 (en) Methods and apparatus for deskewing VCAT/LCAS members
US7609729B2 (en) System and method of multiplexing TDM and packet data
WO2008127383A1 (fr) Mise en œuvre hiérarchisable et efficace d'un vcat/lcas pour des signaux sdh et pdh
CN101243656A (zh) 在sonet中对链路容量调整方案(lcas)的硬件和软件组合实现
US7542484B2 (en) Managing payload specific latencies in a cross-connect system
US20010015980A1 (en) Mapping of dynamic synchronous transfer mode network onto an optical network
EP1926256B1 (fr) Procédé d'alignement dans le temps d'abonnés d'une groupe virtuelle concatenée dans un système de transmission synchrone
EP1047214A2 (fr) Strutures de multiplexage dans des réseaux de communication
US7715443B1 (en) Boundary processing between a synchronous network and a plesiochronous network
Dutta et al. Grooming mechanisms in SONET/SDH and next-generation SONET/SDH

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AU BR CN DE DK ES GB IN JP KR MX PT SG

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
AK Designated states

Kind code of ref document: A3

Designated state(s): AU BR CN DE DK ES GB IN JP KR MX PT SG

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSANT TO RULE 69(1) EPC

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP