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the density and flexibility of its core metro rings using OC-48/STM-16 or DWDM. The service provider could then build out its metro ring infrastructure. At the edge of the network, the provider can deliver multiple access rings per shelf to customer premises. The entire network can thus be managed through a single interface.
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One area of activity that should be mentioned in our discussions of effective bandwidth management in SONET and SDH networks is the effort currently underway by an industry organization known as the Resilient Packet Ring (RPS) Alliance. Based on work outlined in IEEE standard 802.17, the Resilient Packet Ring Alliance is working to create a network solution for moving data traffic across a shared network infrastructure with recovery times equivalent to those available in SONET and SDH networks. Instead of optimizing networks for the transport of traditional TDM traffic, the RPR strategy is to design a network that is optimized for carrying packet-based services that provide dynamic bandwidth provisioning; that utilizes autodiscovery at ring startup; that employs a ring protection protocol to ensure survivability; and that is designed in such a way that little capacity engineering is required. RPR is a Layer 2 technique designed for use in metro applications, offering diverse QoS, carrier class protection, and less expensive network operations. The technique relies on Spatial Reuse Protocol, a technique that enables bandwidth to be reused on a ring. In spatial reuse environments, the destination node employs a technique called destination stripping, in which the message is removed from the ring upon arrival rather than being allowed to continue on to the originating node to signify its correct arrival at the destination. The RPR Alliance, which can be found online at www.rpralliance. org, includes such members as Cisco, Nortel, Avaya, Cyras, Riverstone, Alidian, and a number of others.
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Sycamore is primarily targeted at the wide area environment. Both Storm Telecommunications and 360Networks have installed Sycamore s SN 16000 switches at the heart of their mesh networks. The company s recent
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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acquisition of Sirocco Systems provides Sycamore with a viable entree into the SONET and SDH world; expect to see more from this company.
Ultra Fast Optical Systems
This company has an intriguing technological proposition. Many industry pundits believe that SONET will reach the limits of its transport lifetime at or around 40 Gbps. In response, Ultra Fast Optical Systems has announced Optical Time-Division Multiplexing (OTDM), a technology that is similar to SONET/SDH in that it has the capability to transport low-speed services in high-speed channels. However, it differs from SONET/SDH in that it is an all-optical solution, which enables it to operate at extremely high speeds. According to a paper presented at the European Council on Optical Networking (ECOC 2000), OTDM can reach speeds as high as 640 Gbps and that s one wavelength! OTDM interworks seamlessly with DWDM to deliver terabits of bandwidth. Of course, other vendors are in this game; we have attempted to show a sampling of them to illustrate the diversity of the products that are available.
In Summary
SONET and SDH are a set of standards that define a high-speed, synchronous network and a range of capabilities based on the robustness of optical fiber. The standards address a unique payload-mapping scheme, a welldefined set of Operations, Administration, Maintenance, and Provisioning messages, and a standardized hierarchy of data transmission rates. If you re familiar at all with the development of the telephone network, then you know that digital carrier systems such as T1 and E1 were first deployed as intra-network pipes for high-volume trunking. Over time, they leaked out of the network and, like the tentacles of a giant squid, extended themselves to the customer. SONET and SDH are following a similar path. Initially, they have found applications inside the telco networks as a trunking medium, but are slowly migrating out to the customer as end user applications emerge and SONET/SDH-compliant equipment becomes available. In today s networks, the use of scarce and expensive transmission facilities is optimized by concentrating multiple streams of data or voice converDownloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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