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Central office/ Data center Ethernet services network OC-192 Interoffice ring MSPP IP services network
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Figure 118 The MSPP and Ethernet access to Ethernet or IP services
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In this scenario, a service provider deploys a network dedicated to a single customer often a large corporation or an entity in one of the government, education, or medical (GEM) vertical markets The customer often wants MEF-compliant E-LAN service to provide LAN-like connectivity among its sites, along with DS-n connectivity for PBXs and other traditional telephony equipment, as Figure 119 illustrates Because these typically are high capacity, high functionality, and high dollar networks, survivability is essential For these reasons, dedicated SONET networks with Ethernet capabilities provide a large and profitable business for many service providers Examples include AT&T Ultravailable Managed OptEring Service and Verizon s Enhanced Dedicated SONET Ring (EDSR) With dedicated networks, the network is the service The network elements most often MSPPs must provide not only EoS transport, but also all the attributes of MEF-compliant E-LAN and E-Line services (as well as traditional DS-n private line services) For this reason, MSPPs in dedicated networks must often support a rich set of Ethernet functions, including Ethernet switching Resilient packet ring (RPR) functions enable Ethernet bridging over SONET rings and often fit well in this application The relative complexity of the Ethernet capabilities means that traditional transport OSSs often cannot manage all the functions of dedicated EoS networks This places a higher burden on service providers abilities to integrate these networks into new OSSs and on vendors abilities to develop capable element management systems (EMSs) Table 114 summarizes the typical deployment scenarios for EoS and MSPPs
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Fast OC-48 Ethernet Dedicated ring MSPP DS-n (Customer A) Fast Ethernet MSPP DS-n Fast Ethernet
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Emulates a LAN
Central office Gigabit Ethernet OC-N MSPP Central office OC-192 Interoffice ring (shared)
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Figure 119 The MSPP and dedicated EoS networks
SONET/MSPP
TABLE 114 Typical Deployment Scenarios for EoS and MSPPs Attribute Carrier Ethernet service MSPP Ethernet service support Point-to-point EoS transport in MSPP E-Line Service Delivery E-Line Ethernet Access to Ethernet or IP Service Dedicated EoS Networks E-Line, E-LAN, and/or IP E-LAN, E-Line service (eg, Internet access or IP-VPN) None required E-Line-like functions Yes Not required Often High Traditional transport OSSs for EoS portion Qwest Internet Port; AT&T ACCU-Ring Network Access Service; Verizon s Internet Dedicated Ethernet E-LAN, E-Line Yes Yes Often with RPR Often High New OSSs and vendor EMSs AT&T Ultravailable Managed OptEring Service; Verizon s EDSR
E-Line Yes
Ethernet switching Not required in MSPP Mix of Ethernet and TDM services Survivability OSS environment Examples Often High Traditional transport OSSs Verizon s Ethernet Private Line; Verizon s Optical Networking (VON); Time Warner s Telecom ENLAN
Ongoing Developments
When compared with Ethernet or SONET, EoS (in particular the standard GFP/VCAT/ LCAS mapping) is a relatively young technology Several trends are emerging as this fundamental EoS technology matures, and its applications grow in breadth and depth
Increasing EoS Integration
The first major trend is the integration of EoS into network elements other than MSPPs Although the MSPP remains the primary vehicle for the deployment of EoS, the technology provides benefits that extend beyond MSPPs Other network elements that have begun adopting EoS technology include the following:
Low-cost access devices Compact, ultra-low cost systems that include EoS (possibly along with traditional DS-n over SONET), but without the full functionality of an MSPP Examples include Fujitsu s FLASHWAVE 4020 and RAD s RIC series of Intelligent Converters Routers and MSSs These network elements are beginning to feature EoS interfaces (eg, channelized OC-48 interfaces with GFP/VCAT/LCAS) as a way to provide a high capacity, highly survivable interface with EoS-based access networks Examples include Tellabs MSR 8800 and Hammerhead Systems HSX 6000
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High-capacity multi-service transport systems This catch-all includes high capacity Dense Wavelength Division Multiplexing (DWDM) systems such as Fujitsu s FLASHWAVE 7500, and new devices that combine Ethernet switching, SONET MSPP functionality (including EoS), and DWDM technology, such as Alcatel s 1850 TSS and Fujitsu s FLASHWAVE 9500
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