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As detailed in earlier, EoF and EoWDM can only furnish full-rate connections and cannot (in isolation at least) support subrate or switched Ethernet services leaving a
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substantial service gap, particularly since fractional Gigabit Ethernet demands from SME outfits will form a large portion of overall demand Hence, carriers must incur added capital and operational expenditures to deploy higher-layer devices to fill this void At current market price-points, EoWDM transponders are best-suited for EPL speeds exceeding 10 Gbps [2] As a result NGS/MSPP solutions will be more cost-effective for fractional service rates in the lower ten-hundreds of megabits range, particularly if SONET/SDH infrastructures are already in place As a compromise, some carriers can use CWDM transport in these slower-rate settings Another area of concern for EoF and EoWDM is the lack of fully matured standards For example, EoF is generally incapable of supporting full-spectrum management, at least until switch vendors offer full Ethernet OAM functionality on their ports (see Ethernet Management) Meanwhile, even though EoWDM provides much better OAM capabilities, most offerings are still vendor proprietary In addition, there are no standardized protocols for optical layer protection Although many vendors provide good solutions, these are proprietary and borrow heavily from SONET/SDH schemes In all, these factors give increased OSS integration costs, low interoperability, and impose complexities for operations staff By contrast, EoS can extend established carrierclass OAM coverage to full and fractional-rate EPL/EVPL services via new standards such as generic framing procedure (GFP), ITU-T G7041, and link capacity adjustment scheme (LCAS), ITU-T G7042 (see Figure 88) Finally, DWDM is a relatively new and highly specialized technology with complex underlying physical-layer concerns Hence, most DWDM networks require a sizeable amount of preplanning design and continual fine-tuning to maintain BER performance Some of the key issues here include span loss budgets, amplifier placements, dispersion compensation, and wavelength assignment Although third-generation soft-optics DWDM technologies (see Optical Network Architectures) are helping automate many manual provisioning tasks, it will still take time and money for carriers to master these technologies As a result, skilled technical staff will be required to run these networks, adding to operational overheads and inevitably impacting Carrier Ethernet (EoWDM) pricing
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In light of the just described benefits and shortcomings, a consensus is emerging on some amenable scenarios for EoF and EoWDM In general, EoF is good for shorterdistance fiber-rich settings and customers with relaxed fault tolerance and OAM needs Alternatively, EoWDM is a more carrier-ready approach and has a sweet-spot for multigigabit users with genuine MAN/WAN coverage and robust QoS/OAM needs As DWDM costs decline, the price-per-bit economics of EoDWM will also become increasingly compelling [12] Some of the main deployment scenarios are now detailed
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Businesses continue to scale and simplify their networks and are moving away from legacy private line services In the corporate sector, Carrier Ethernet demand is coming
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from several key areas A major application is data-center/back-office consolidation of server farms and data-warehousing operations to improve operational efficiencies Another pressing scenario is LAN-over-MAN extension across inter-campus sites For example, many operations are being moved from high-rent downtown areas to suburban regions to lower costs and facilitate worker access This is driving the need for virtual LAN solutions via underlying point-to-point EPL or multipoint EPLAN services Note that direct LAN extension at the Layer 2 level also reduces the need for costly Layer 3 devices because only a few routers or MPLS nodes are needed for external connectivity Now most corporate demands today are comprised of fractional EPL and represent a growing migration from legacy private lines In general, these speeds are best provisioned by electronic-layer routing and switching solutions such as EoS or EoMPLS EoS is particularly cost-effective in low demand incumbent networks, as it can augment existing legacy voice and leased line offerings Alternatively, for carriers operating CWDM/DWDM infrastructures, thin-mux aggregation devices can be considered in conjunction with EoWDM Regardless, a gradual shift toward gigabit-level EPL speeds is expected For example, 10 Gbps Ethernet interfaces are now becoming standard on most servers and storage arrays It is here that the economics of EoF/EoWDM will begin to dominate Specifically, EoF will make sense for smaller service providers offering less-critical full-rate LAN extension at lower price-points, for example, competitive local exchange carriers (CLEC) Meanwhile larger operators particularly those with built-out WDM infrastructures can target high-density/longer distance EPL interconnections with robust OAM support
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