WO2000062575A1 - Systeme et procede de transmission de paquets sur un reseau optique longue distance - Google Patents

Systeme et procede de transmission de paquets sur un reseau optique longue distance Download PDF

Info

Publication number
WO2000062575A1
WO2000062575A1 PCT/US2000/010131 US0010131W WO0062575A1 WO 2000062575 A1 WO2000062575 A1 WO 2000062575A1 US 0010131 W US0010131 W US 0010131W WO 0062575 A1 WO0062575 A1 WO 0062575A1
Authority
WO
WIPO (PCT)
Prior art keywords
packets
transmission
optical fiber
pπoπty
level
Prior art date
Application number
PCT/US2000/010131
Other languages
English (en)
Inventor
Mohommed Majd
Peter K. Runge
Patrick Trischitta
Richard W. Muise
William C. Marra
Original Assignee
Tyco Submarine Systems, 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
Priority claimed from US09/291,335 external-priority patent/US6680948B1/en
Application filed by Tyco Submarine Systems, Ltd. filed Critical Tyco Submarine Systems, Ltd.
Publication of WO2000062575A1 publication Critical patent/WO2000062575A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • 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

Definitions

  • the present invention relates generally to the optical transmission of information and, more particularly, to systems and techniques for improving transmission capabilities over long haul optical fiber transmission systems.
  • long-haul network 10 incorporates four terminal or "landing" stations indicated generally at 12, 14, 16, and 18 respectively. Within each terminal station, SDH multiplexing/demultiplexing equipment 20 is provided for accepting and aggregating voice and data traffic from multiple subscribers (not shown).
  • each such subscriber illustratively an internet service provider (ISP) supplies a stream of voice or data traffic at an agreed upon SDH transmission rate as, for example, 155 Mb/s, 622 Mb/s or 2.5 Gb/s.
  • ISP internet service provider
  • LTU line terminating equipment
  • switches and bridges and monitoring and control circuitry.
  • these devices have accommodated a number of architecture and networking options, including the most widely used add/drop line switched ring-protected configuration shown in FIG. 1.
  • the stations are interconnected by multiple fiber pairs, each fiber pair 24a- 24d extending between respective LTUs.
  • network topology of FIG. 1 which as will be recalled is chosen to achieve the high reliability generally demanded by subscribers, it will be readily appreciated by those skilled in the art that the distinction between "working" and
  • protection fibers translates into only fifty percent of the nominally available transmission capacity being made available to subscribers for carrying transmission capacity that can be protected against failures.
  • Packets are received at a first boundary node of a long haul optical communication network which may either interconnect originating and destination communication networks or form an integral part of a single end-to-end network. Packets are reclassified to reflect a higher p ⁇ onty of transmission than non-long haul bound packets, as by marking them with an indication of a modified p ⁇ o ⁇ ty level of transmission. Reclassified packets are transmitted over a long-haul optical hnk to a second boundary node.
  • packets arriving at the second boundary node may be re-mapped or reclassified to a value recognized as being of at least equal and, preferably, higher p ⁇ o ⁇ ty than that o ⁇ gmally established by the o ⁇ ginatmg network and/or first boundary node.
  • a substantially equal p ⁇ o ⁇ ty value in the reclassification establishes at least a consistent, end-to-end quality of service for each packet that has traversed the long haul portion of a communications network.
  • More efficient use of transmission resources is realized by associating a higher p ⁇ o ⁇ ty with packets that have traversed the long haul portion of the network, each packet increasing in value as it nears the ultimate destination. Essentially, the reclassification decreases the likelihood that a packet, having made such substantial progress as to have traversed the length of the long haul portion of the network, will be dropped p ⁇ or to reaching its destination and require retransmission.
  • the p ⁇ o ⁇ ty classification scheme of the present invention also permits different classes of service to be defined.
  • Long haul optical fiber communication networks especially long haul undersea optical fiber communication networks, typically interface many different ISP domains with heterogeneous application requirements.
  • Utilizing a packet classification scheme permits the long haul network owner or operator to not only accommodate these diffe ⁇ ng application requirements, but also to offer flexible p ⁇ cing. By way of illustration, this may be achieved in an IP traffic carrying network by configu ⁇ ng the boundary router to evaluate a field in the packet header in conjunction with the source port address.
  • the owner or operator of the long haul network may, for example, sell a certain amount of capacity as "guaranteed” or "premium” class transmission services - corresponding to that portion of the network which can be reliably served (e g., that capacity which would otherwise have been provided, for example, by the "working fiber” in the conventional topology of FIG. 1.
  • Additional capacity may be sold to ISP networks and other data communication networks in accordance with an "assured services" contract for transmission services.
  • the entire capacity may again be sold to still other data communication networks in accordance with a contract for "best effort" services. In this manner, service is pledged to those subsc ⁇ bers willing to pay, while others can contract for whatever capacity is left over when and as it becomes available.
  • packets ar ⁇ vmg from the first data communication network are examined to determine the destination port address.
  • most or all of the processing resources of the boundary router are reserved for traffic to be routed via the long-haul network to which the boundary router is connected.
  • segmentation is achieved between, on the one hand, the long haul optical fiber communication network itself, and on the other hand, the data communications networks connected thereto such, for example, as the first and second data communication networks.
  • this may be achieved an IP traffic carrying network by assigning at least one of a plurality of interfaces of a source boundary router to at least the particular IP address associated with the second data communication network.
  • Still others of the interfaces of the source boundary router may be assigned to respective IP addresses associated with other data communication networks with which mterconnectivity is to be established by the long haul network.
  • the aforementioned segmentation is achieved by configu ⁇ ng the router to examine the destination address of each packet received via the first plurality of interfaces and dropping those packets which do not match an IP address associated with one of the second plurality of interfaces.
  • multiple queues may be established in which packets requmng routing via the long haul network are given preferential treatment over those which do not require such routing.
  • the segmentation aspect of the present invention does not require the use of the plural groups of interfaces capable of transmitting at respectively different line rates.
  • FIG. 1 depicts a conventional implementation of a long-haul optical communication network in which SDH add/drop multiplexers are deployed in a bi-directional line switched rings, with optically amplified links extending between terminal nodes;
  • FIG. 2 depicts a graphical representation of the relationship between total system capacity and transmission distance in an illustrative long haul optical fiber communication system over which a plurality of wavelength division multiplexed channels are transmitted;
  • FIG. 3 is a diagrammatic view showing the interconnection of several data communication networks in a long haul optical optical fiber communication system employing boundary routers according to the present invention, which can be readily extended to more complex application;
  • FIG. 4 is a block schematic diagram of a router constructed in accordance with an embodiment of the present invention.
  • FIG. 5 is a simplified view depicting the interconnection of a single boundary router to multiple ISP networks, the boundary router forming part of a cable landing station to provide such ISP networks with access to an undersea long haul network;
  • FIG. 6 A shows a prior art format for a data packet
  • FIG. 6B shows the format of a network layer header
  • FIG. 7 is a block schematic diagram of a router constructed in accordance with a modified embodiment of the present invention.
  • FIG. 8 shows a packet routing process and method suitable for long haul boundary routers and which may be implemented by the boundary router of FIG. 6.
  • an illustrative communications network 30 comprising a long haul optical fiber communication network 100 interconnecting a first plurality of data communication networks including networks 32 and 34 and a second plurality of data communication networks including networks 36 and 38.
  • each of the data communications networks is depicted as an internet service provider (ISP) network which, as will be readily appreciated by those skilled in the art, typically comprise a number of edge routers (not shown) directly connected to numerous individual workstations as workstations 40a and 40b. Each such workstation has, by virtue of the ISP edge router to which it is connected, an associated, and typically dynamically assigned, IP address.
  • ISP internet service provider
  • link L3 between backbone routers 42 and 44 provides the shortest path for exchanging aggregated traffic between the respective groups of subscribers.
  • link L6 between backbone routers 46 and 48 provides the shortest path for the exchange of traffic between their respective subscribers.
  • long-haul connectivity between the first and second plurality of data communication networks is achieved via long haul boundary routers 50 and 52 of optical fiber communication network 100, by which boundary routers traffic is exchanged on the one end by links LI and L2 associated with the first plurality of data communication networks and on the other end by links L4 and L5 associated with the second plurality of data communication networks.
  • signals to be transmitted over fibers as fibers 54 and 56 are directed to a particular interface (not shown) of routers 50 and 52, respectively, and these are formatted, in a conventional manner by line terminating units (LTUs) 58 and 60, to obtain characteristics suitable for long-haul transmission.
  • LTUs line terminating units
  • the teachings of the present invention may be readily extended to more complex situations as, for example, those in which plural long haul optical fiber networks are involved.
  • additional long haul communication networks as network 101 including additional boundary routers as routers 50' and 52', may be added to collectively form a single, integrated network topology.
  • Router 200 generally comprises a plurality of interfaces or ports 201-224 that are each coupled to a corresponding network link (Ll-Ln).
  • network links may comprise links LI, L2, L4 and L5 of FIG. 3, as well as other links necessary for exchanging traffic between remote data communication networks via long haul network 100.
  • Ports or interfaces assigned to such links, as ports 201-203 in FIG. 4 are operable to transmit and receive at the line rate corresponding to the bandwidth provisioning contract made with that subscriber.
  • one subscriber such as an ISP network may have an agreement with the owner or operator of network 100 to accommodate 10 Gbps.
  • Another subscribing ISP network may have a commitment specifying a rate of 2.5 Gbps or other committed rate.
  • network links are reserved for interconnecting long haul boundary routers as router 200 with one another (as routers 50 and 52 in FIG. 3) to thereby direct traffic over the fiber span comprising the long haul portion of network 100.
  • ports or interfaces assigned to the latter type of links, as ports 225-227 are operable to transmit and receive at a line rate which is either greater or lower than the line rate corresponding to the bandwidth provisioning contract made with a subscribing data communication network, depending upon the particular characteristics of the long haul network.
  • the ports of boundary router 200 receiving and transmitting signals via the line terminating equipment (LTUs) are configured to do so at the line rate of 5 Gb/s or as close thereto as practicable.
  • LTUs line terminating equipment
  • 192 stream at a line rate of 10 Gb/s arrives at port 201 from ISP network 12 via link LI, the stream is separated by long haul boundary router 200 and sent over two separate wavelength channels, each modulated at a rate of 5 Gb/s, by long haul network 30 via two ports, illustratively ports 225 and 226, while maintaining the integrity of individual flows.
  • a first OC-48 stream at a line rate of 2.5 Gb/s arrives at port 202 from ISP network 14 via link L2 and a second OC-48 stream at a line rate of 2.5 Gb/s arrives at port 203 from ISP network 16 via link L3, then they may be combined into one 5 Gb/s signal by long haul boundary router 200 - that is, both streams may supply packets to a single port, illustratively 227, of router 200.
  • long haul boundary router 200 with the existing routers in a packet switching or routing network is deemed by the inventors herein to constitute an especially advantageous aspect of the present invention That is, it is recognized that realization of the illustrative network topology depicted in FIG. 3 requires long haul boundary routers 50 and 52 (and others implementing the functionality of router 200 in FIG 4), to advertise their availability to routers such as ISP backbone routers 42-48 (as well as to others collectively comprising the non-long haul portion thereof) and to exchange packets therebetween As will hereinafter be discussed in detail, such interoperability presents a particular set of opportunities to the owner or operator of an undersea optical fiber communication network.
  • the boundary router R3 forming, in accordance with an especially prefe ⁇ ed implementation of the invention, part of a cable landing station providing the ISPs with access to an undersea long-hual optical fiber communication network
  • undersea or "trunk” ports are distinguished from te ⁇ est ⁇ al or "access” ports (those routing traffic to and from the ISP networks ISP 1 and ISP2.
  • the access ports of router R3 are connected via links LI and L2 to routers Rl and R2, in the network backbones of ISPl and ISP2 domains, respectively.
  • Rl and R2 are themselves directly interconnected via another link, L3.
  • the routing tables in Rl and R2 contain information on only one route (L3) connecting the ISPl and ISP2 domains.
  • router R3 and links LI and L2 are introduced, router R3 updates its own routing table to reflect its relationship with the adjacent backbone routers and it advertises its availability to provide a second route between ISPl and ISP2.
  • L3 In the event of a break or congestion in L3, indirect exchange of packets between ISPl and ISP2 might be performed.
  • Such utilization might burden the undersea boundary router R3 with the terrest ⁇ al traffic between Rl and R2 and, in so doing, substantially reduce the rate at which traffic is exchanged with the links of the long haul undersea network.
  • boundary routers configured for interconnection to an undersea optical fiber communication network in accordance with an especially prefe ⁇ ed embodiment of the present invention include a filtering functionality that is sufficient to prevent or limit the ability of non long-haul (e.g , non-undersea) traffic from consuming processing resources essential to maintaining efficient traffic flow through the long haul network.
  • link L3 provides a diversely routed path to link L2, and router R2 throttles and p ⁇ o ⁇ tizes the traffic - dumping the te ⁇ est ⁇ al or non long-haul traffic, if necessary, in favor of the long-haul traffic As indicated in FIG 3, such capability might be further expanded to divert traffic from long haul network 100 to long haul network 101.
  • a routing engine 260 of boundary router 200 is coupled to each of the ports 201-248 for processing and forwarding packets received from the ports using the included filters 262.
  • a routing engine typically comp ⁇ ses a central processing unit (CPU) (not shown), a packet memory, and a system memory wherein the system memory typically stores applications programs that provide filte ⁇ ng functions
  • filters 262 may actually be software ent ⁇ es stored in the mam memory. Alternatively, filters may be provided using hardware.
  • FIG. 6A generally shows a typical data packet as comp ⁇ sing a physical media layer
  • FIG. 6B shows a portion of a network layer header as compnsing a multiplicity of fields that includes a version field 705, and a source IP address field 710, and a destination IP address 715.
  • the routing engine utilizes the filter to compare the att ⁇ butes of the received packet to the c ⁇ te ⁇ a specified by the filter
  • the c ⁇ te ⁇ a used to filter a packet may comp ⁇ se any att ⁇ bute of the received packet.
  • common c ⁇ te ⁇ a include source IP address, destination IP address, and source or destination port address.
  • Boundary routers in accordance with the invention are provided with a traffic filter that ensures that packets destined for the long-haul network 30 are aggregated, separated, or otherwise routed to selected ports of the router for ultimate processing by the line terminating equipment Moreover, in accordance with an especially preferred embodiment of the invention, packets to be exchanged between ISP networks or routers which are on only one side of long haul network 30 are treated with lowest p ⁇ o ⁇ ty or dropped to preserve processing resources. According to this basic example, the only c ⁇ te ⁇ on required is the destination port address (by which the router distinguishes between an "access" port and an "undersea” port) which can be de ⁇ ved from the packet header.
  • DSCP Differentiated Services Code Point
  • a "premium services” class may be established for applications requi ⁇ ng low delay and low jitter
  • an "assured services” class may be established for adaptive real time applications requi ⁇ ng reliable but not fixed delay bounds
  • a "best effort service” corresponding to the current implementation of the internet, may be established in which traffic is forwarded as quickly as possible with no guarantee for actual or timely delivery.
  • a particular requirement of an undersea boundary router according to the present invention is that it must interconnect different ISP domains, with co ⁇ espondingly diverse applications.
  • FIG. 7 is a schematic block diagram depicting a boundary router 300 of the present invention especially suited for the application depicted in FIG. 5 and especially intended for the routing of IP traffic.
  • a service level agreement (SLA) between the network operating the boundary router and the customer determines the traffic conditioning terms for each specific customer
  • the traffic conditioning functions such as classification, metering, re-marking, and policing are applied in policing module 302 at the ingress ports 302 of router 300.
  • each individual undersea port of the boundary router 300 can be allocated to a corresponding customers or one interface can be shared among several subscribing ISPs having the same or similar QoS expectations and traffic. Such an arrangement would allow a single SLA to be applied at each ingress port — making traffic conditioning operations less processing intensive.
  • compliant packets are advanced under the direction of the routing engine 304 through the routing fabric 306 to an output scheduling module. Those packets bound for the undersea network are queued in an output scheduler according to the QoS parameters and output to the LTU (not shown) for subsequent processing.
  • Packets enter the process at block 812,. Packets are received at block 812, whereupon the process proceeds to a step of multi-field (MF) classification (block 814) which may, for example, comprise an extensive classification based on the content of source address, destination address, DSCP field, source and destination port number.
  • MF classification is first used to preferentially direct the traffic between te ⁇ estrial ports and undersea ports and to drop or reduce the priority of the local te ⁇ estrial traffic block 816.
  • MF classification proceeds further in a step of separating different customers' traffic to enable separate SLA enforcement if traffic from multiple customers with various SLAs is submitted to the same port or interface (block 818). Packets then proceed through a "Behavior-Aggregate" (BA) classification (in this example for each different SLA associated with the destination port) (block 820 or 822).
  • BA Behavior-Aggregate
  • Behavior Aggregate process which is a process of sorting packets based only on the content of the differentiated services field (DSCP) in the IP header.
  • DSCP differentiated services field
  • remarking or dropping is performed in blocks 826a-826f For example, if some packets are not considered as being "m-profile", then their DSCP fields are re-marked to a lower class or they are completely dropped depending on the terms of the SLA
  • the packet output scheduler schedules the packet in one of the different classes to meet its QoS requirements (block 828) and the packet is transmitted via the undersea network (block 830).
  • a received packet does not requires routing via the fiber spans of a long-haul network 30 (i.e., as for an exchange of data traffic between boundary routers 50 and 52, then the router filte ⁇ ng scheme could be configured to drop the packet Alternatively, its DSCP field could be remarked to the lowest class of traffic in the QoS hierarchy.
  • a unique feature of the invention herein is that a consistent end to end quality of service can be provided to network subscribers. In addition to the process steps desc ⁇ bed above, this further includes a step of re-marking the packet at the destination boundary router based.
  • the destination boundary router (e.g., boundary router 52 m FIG. 3) may be configured to examine packets received from the source boundary router (e.g. boundary router 50), ascertain the DSCP field or other indicia of QoS preference in the packet) and re- mark the packet, before passing it to the destination backbone router (e.g. router 48 of FIG. 3), to signify a request for the closest QoS level available in the destination network.
  • the source boundary router e.g. boundary router 50
  • the destination backbone router e.g. router 48 of FIG. 3
  • a default configuration may be to convert all undersea routed packets to the highest p ⁇ o ⁇ ty m the destination network. Such a configuration advantageously conserves transmission resources by decreasing the likelihood that a packet, having made such substantial progress as to have essentially traversed the entirety of the long haul optical communication network, will be dropped p ⁇ or to reaching its destination and require re-transmission.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Des paquets sont reçus à un premier noeud frontière d'un réseau de communication optique longue distance, capable d'interconnecter des réseaux de communication de départ et d'arrivée ou de faire partie intégrante d'un réseau unique de bout en bout. Les paquets sont reclassés de façon à refléter une priorité de transmission supérieure par rapport à des paquets non associés à une longue distance. Les paquets reclassés sont transmis sur une liaison optique longue distance vers un deuxième noeud frontière. Les paquets arrivant au deuxième noeud frontière peuvent être remis en correspondance ou reclassés selon une valeur reconnue comme présentant une priorité au moins égale à celle qui a été établie par le réseau de départ et/ou par le premier noeud frontière, et de préférence supérieure à celle-ci. On obtient une utilisation plus efficace des ressources de transmission en associant une priorité supérieure à des paquets ayant traversé la partie longue distance du réseau, chaque paquet présentant une valeur croissante à mesure qu'il approche de la destination finale.
PCT/US2000/010131 1999-04-14 2000-04-14 Systeme et procede de transmission de paquets sur un reseau optique longue distance WO2000062575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/291,335 US6680948B1 (en) 1999-02-02 1999-04-14 System and method for transmitting packets over a long-haul optical network
US09/291,335 1999-04-14

Publications (1)

Publication Number Publication Date
WO2000062575A1 true WO2000062575A1 (fr) 2000-10-19

Family

ID=23119891

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/010131 WO2000062575A1 (fr) 1999-04-14 2000-04-14 Systeme et procede de transmission de paquets sur un reseau optique longue distance

Country Status (1)

Country Link
WO (1) WO2000062575A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7046665B1 (en) * 1999-10-26 2006-05-16 Extreme Networks, Inc. Provisional IP-aware virtual paths over networks
EP3624399A1 (fr) * 2018-09-12 2020-03-18 SubCom, LLC Techniques de partitionnement sécurisé d'un système de transmission optique pour fournir un accès de gestion multi-clients et système de gestion de réseau les mettant en uvre

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5583997A (en) * 1992-04-20 1996-12-10 3Com Corporation System for extending network resources to remote networks
WO1998033299A1 (fr) * 1997-01-28 1998-07-30 Loran Network Systems, Llc Procede servant a constituer automatiquement des agregats d'objets

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5583997A (en) * 1992-04-20 1996-12-10 3Com Corporation System for extending network resources to remote networks
WO1998033299A1 (fr) * 1997-01-28 1998-07-30 Loran Network Systems, Llc Procede servant a constituer automatiquement des agregats d'objets

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ANDREW K. BJERRING; BILL ST. ARNAUD: "The Role of Optical Internets in the New Public Network", TELECOMMUNICATIONS ONLINE, XP002144784, Retrieved from the Internet <URL:http://www.telecoms-mag.com/issues/199901/tcs/state2.html> [retrieved on 20000809] *
MANCHESTER J ET AL: "IP OVER SONET", IEEE COMMUNICATIONS MAGAZINE,US,IEEE SERVICE CENTER. PISCATAWAY, N.J, vol. 36, no. 5, 1 May 1998 (1998-05-01), pages 136 - 142, XP000752858, ISSN: 0163-6804 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7046665B1 (en) * 1999-10-26 2006-05-16 Extreme Networks, Inc. Provisional IP-aware virtual paths over networks
EP3624399A1 (fr) * 2018-09-12 2020-03-18 SubCom, LLC Techniques de partitionnement sécurisé d'un système de transmission optique pour fournir un accès de gestion multi-clients et système de gestion de réseau les mettant en uvre
CN110896506A (zh) * 2018-09-12 2020-03-20 萨伯康姆有限责任公司 用于对光传输系统进行安全分区以提供多客户端管理访问的技术和实现其的网络管理系统
US11044252B2 (en) 2018-09-12 2021-06-22 Subcom, Llc Techniques for secured partitioning of an optical transmission system to provide multi-client management access and a network management system implementing same
CN110896506B (zh) * 2018-09-12 2024-03-26 萨伯康姆有限责任公司 用于对光传输系统进行安全分区以提供多客户端管理访问的技术和实现其的网络管理系统

Similar Documents

Publication Publication Date Title
US6680948B1 (en) System and method for transmitting packets over a long-haul optical network
CA2743548C (fr) Systeme, appareil et procede de formation de connexions de reseau agrege
US6963575B1 (en) Enhanced data switching/routing for multi-regional IP over fiber network
US7145867B2 (en) System and method for slot deflection routing
US7257120B2 (en) Quality of service (QoS) based supervisory network for optical transport systems
US7499468B2 (en) Method of adapting an optical network to provide lightpaths to dynamically assigned higher priority traffic
US20090257751A1 (en) Aggregating Optical Network Device
Xiong et al. Achieving fast and bandwidth-efficient shared-path protection
US8339985B2 (en) Method and system for announcing traffic engineering parameters of composite transport groups
EP1122971A2 (fr) Réservation de canaux de données dans des réseaux optiques avec commutation en rafale
US7633933B2 (en) Systems and methods for a hierarchical layer one and layer two cross-connect in a transport and aggregation platform
US20050244158A1 (en) Method and apparatus for a variable rate pipe on a linear connection
EP1089506A2 (fr) Appareil et méthode pour télécommunication intégrée
US20090263129A1 (en) High-speed packet/ethernet devices, methods, systems and networks incorporating tunable pluggable optics for packet switching and routing functions, and incorporating gmps as the control plane
US9197438B2 (en) Packet forwarding node
Tsirilakis et al. Cost comparison of IP/WDM vs. IP/OTN for European backbone networks
WO2000062575A1 (fr) Systeme et procede de transmission de paquets sur un reseau optique longue distance
Jukan QoS-based wavelength routing in multi-service WDM networks
US10075259B2 (en) Systems and methods of time slot allocation for shared mesh protection on bundled links
US20070263661A1 (en) Wide area multi-service communication networks based on connection-oriented packet switching
JP2012104886A (ja) 転送制御装置
Ramnath et al. Experimental and trial-based study of Resilient Packet Ring
Hanell et al. Channelized reserved services architecture for guaranteed QoS
Tirado Real World Experiences in deploying Ethernet
Vasudha et al. Trial of an RPR-based Optical Metro Ring

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP

AL Designated countries for regional patents

Kind code of ref document: A1

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

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP