Integrating Digital Optical Long haul Networks with the Metro Edge Network.pdf

Integration of Digital Optical Long haul with Metro Edge Networks
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   Applications| CASE BY CASE 18   18 November 2009   N ve ber 2 09 LIGHTWAVE   LI HT VE www.lightwaveonline.com Integrating digital optical long-haulnetworks with the metro edge By Paul R. Morkel  D igital optical network tech-nology has long providedhigh-density transport withintegrated bandwidth management,a fexible architecture, recongurableadd/drop capability, network sim-plication, reliability, and integratedbandwidth management in long-hauland regional networks. These ben-ets can now be extended to themetro edge to enable end-to-endservice and bandwidth managementwith subwavelength granularity.This article provides a brie overview o the exist-ing digital optical network technology, describes howits benets apply to the metro network, and oersapplications examples in both integrated and stand-alone deployments. Leveraging digital optical networks Digital optical network technology implements ahigh level o component integration into an ecientlong-haul and regional transport and bandwidth man-agement system using photonic integrated circuits.It provides integrated 2.5-Gbps granularity digitalswitching and grooming, ull digital perormancemonitoring, service protection, and end-to-end pro-visioning to support up to 160 wavelengths per ber.Density is urther improved with optical multiplexingon a compact line card.A key advantage o the digital optical network ap-proach over all-optical recongurable optical add/ drop multiplexer (ROADM)-based systems has beenits ability to provide bit-transparent services withrequent and comprehensive digital perormancemonitoring. The PIC technology provides highly cost-eective optical-electrical-optical (OEO) conversiono the optical signals as they transit the network, al-lowing bit-error-rate (BER) perormance monitoringwherever required and control-plane-based serviceprovisioning across the network.There are signicant benets to a digital opticalnetwork platorm when compared to its all-opticalcounterparts. They include greater density, simplic-ity o operation, and unique bandwidth virtualizationor fexible allocation o network resources to meetany service need, using fexible “any service, anyport” service adaptation.Many carriers using digital optical network plat-orms or long-haul and regional networks want toextend their core networks toward the metro edge.However, core and edge equipment are generallysubject to dierent optimization criteria. Optimizationor the edge requires ecient single-wavelength ter-mination capability, which is generally not the casein the core network. The edge network technologymust then be cost ecient in these applications andprovide integrated hando to the core network ortrue end-to-end network interoperation. OVERVIEW and transport across an integrated end-to-end network. Paul R. Morkel issenior director or  product marketing at Infnera Corp.(www.infnera.com),headquartered inSunnyvale, CA.  BandwidthgroomingGbEOC-12FibreChannelOC-48OC-48Client servicesGbE10-GigabitwavelengthFibreChannelOC-12Client servicesClient services www.lightwaveonline.com LIGHTWAVE November 2009 19CASE BY CASE cont. |Applications Intelligence for the metro edge New intelligent metro edge technology provides digi-tal optical network CWDM/DWDM aggregation andtransport with up to 40 wavelengths o 10-Gbps scal-ability, either as a standalone edge transport systemor integrated within a digital optical core network.Either applications adds a very cost-eective, space-saving, and power-efcient WDM-based transportcapability to the metro, extending the core networkor in a “second mile” scenario.The hybrid end-to-end approach enables the digitaloptical core and the metro edge to interoperate withoptimization or each distinct segment o the network.For example, i there are just a ew wavelengths atthe edge, an intelligent metro edge platorm with itsshorter reach, cost-eectiveness, lower power con-sumption, and space efciency is clearly a good ft.But in the network core with its lon-ger distances, very high capacity,and bandwidth management require-ments, the digital optical networkcore platorm works best. Bringingboth platorms together in a way thatworks or either application is essen-tial to satisying carrier expectations.Typically, a telecom carrier builds an end-to-end op-tical network today using a combination o platorms.Three distinct components are required: the core orlong-haul network, the metro transport network, anda bandwidth management unction. There is virtuallyno integration at the network level other than the cli-ent interaces and some level o common networkmanagement.However, or carriers deploying a digital opticalnetwork approach or their core network, the intelli-gent metro edge platorm now makes it possible togain additional unctionality using only two compo-nents. The intelligent edge platorm delivers commonend-to-end bandwidth management that enables e-fcient service provisioning and aggregation rom theingress to the egress o the network, regardless owhether the service srcinates or terminates at the LINKS TO MORE INFORMATION LIGHTWAVE: Digital Optical Networks Simplify Architectures LIGHTWAVE ONLINE: Heavy Reading: Photonic Integration to Drive NGOptical Development  LIGHTWAVE: Bandwidth Virtualization Enables a Programmable Optical Network  FIGURE 1. Using an intelligent metro edge WDM platform, a wide range of services can be aggregated onto wavelengths and transported across the metro network for handoff to the digital optical core network—without the need for transponders at theinterconnection points.  ______________  _______________________________________________  ________________________________________  ________________________________________________  ______   Metro enterpriseaccess extensionCarrier accessextensionMetro access tocarrier hotels or PoPsLong-haulPoPCollectorring Regional network  20 November 2009 LIGHTWAVE www.lightwaveonline.com  Applications| CASE BY CASE cont. core or metro areas o the network (see Fig. 1).Automated discovery o interconnected equipmentand network topologies using control plane technologysimplifes integrated network management. Typically,as a carrier connects equipment rom various vendors,connections between equipment types must be manu-ally entered into the management system database.That means every connection across the network mustalso be manually managed. An intelligent metro edgeplatorm simplifes interoperability rom a resourceand topology management perspective along with ser-vice-level management. End-to-end provisioning acrossthe network can be enabled, thus speeding and simpli-ying turn-up o new revenue-generating services.Since the digital optical network architecture hasbuilt-in bandwidth management through an elec-trical switch abric at every node, the end-to-endinrastructure can also take advantage o inte-grated bandwidth management. Using commonmultiplexing and raming protocols, a wide rangeo services can be aggregated onto an integratedwavelength and transported across the metro edgenetwork or hando to the digital optical core net-work—without the need or a transponder at theinterconnection point, and with hando at the ag-gregated rate, as shown in Fig. 1. Services arethen transported across the digital optical core net-work with multipoint distribution as required.Building bandwidth-managed networks without sepa-rate standalone equipment is a clear advantage whencompared to using combinations o multiple types oequipment to gain similar unctionality. Applying thesame architecture rom the metro edge to the networkcore and out to other remote metro edges provides avery cost-eective end-to-end inrastructure.  Applications—integrated and standalone The intelligent metro edge component is eectivelyused in many applications, both as a standalone plat-orm or integrated with the digital optical core networksystem. Typical applications include long-haul/regionalnetworks (see Fig. 2), metro core extension, broad-band backhaul, and data center connectivity.In Fig. 2, or example, an intelligent metro edge WDMplatorm integrates a digital optical core network withthe metro edge. The subtending rings connect severallarge enterprises and small distribution ofces at themetro edge to the regional core network. This pro-vides both connectivity and aggregation or a range oservices rom customer locations to the regional point- FIGURE 2.  The intelligent metro edge WDM platorm extends the reach o a regional core network into metro enterprises anddistribution ofces.  www.lightwaveonline.com LIGHTWAVE November 2009 21CASE BY CASE cont. |Applications o-presence (PoP). This application can be used bytraditional carriers or multiservice operator networks.CWDM and DWDM options may be used, dependingon reach and scalability requirements. The key beneftto carriers using digital optical network architecturesis the ability to manage circuits rom end to end, whileavoiding back-to-back equipment at interconnect points.Another application that may not require long-haulnetwork interworking is high-capacity data center con-nectivity. In this application, cost-eective transport andaggregation o Gigabit Ethernet, 10-Gigabit Ethernet, andSAN protocols can be accomplished easily and efcientlywith the same platorm. The intelligent metro edge WDMplatorm provides space and power efciency, simplifedoperations, exible bandwidth scalability, and reach inthese types o applications, and supports seamless inte-gration with the digital optical network core when needed.  To sum it up The intelligent metro edge technology creates a muchsimpler transport system, using just two integratedcomponents versus three components (core system,metro WDM system, and a bandwidth managementunction) rom multiple vendors. Simplifed end-to-endprovisioning across the entire system, with service ac-tivation measured in seconds instead o days, providesmore efcient service to customers while cutting costsor the carrier.Integrating the digital optical core network with themetro edge through an intelligent metro WDM plat-orm extends the benefts o digital optical networktechnology to both ends o the network. Capital is re-duced, along with cost o ownership, while operationsare simplifed or wavelength-level switching and sub-wavelength transport.
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