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Before we descend into the technological depths of the SONET frame structure, let s revisit the purpose for SONET in the first place. Remember that the digital hierarchy (DS-0, DS-1, DS-2, DS-3, and so on) was created to provide cost-effective multiplexed transport for voice and data traffic from one location in a network to another. SONET has the same responsibility, albeit on a larger scale: indeed, it is sometimes described as T-1 on steroids. SONET brings with it a subset of advantages that makes it stand above competitive technologies. These include mid-span meet, improved operations, administration, maintenance, and provisioning (OAM&P), support for multipoint circuit configurations, non-intrusive facility monitoring, and the ability to deploy a variety of new services. We will examine each of these in the following sections.
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When Bill McGowan first complained about the fact that Equal Access required him to ultimately spend MCI s money on AT&T hardware, he was complaining about the lack of a mid-span meet ability in other words, the ability of one vendor s optical multiplexer to not only connect electrically with that of another vendor, but to actually pass understandable maintenance messages between the two. Because of the monopoly nature of early networks, interoperability was a laughable dream. Following the divestiture of AT&T, however, and the realization of Equal Access, the need for interoperability standards became a matter of some priority. Mid-span meet was SONET s contribution to this important effort.
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Improved OAM&P is without question one of the greatest contributions that SONET brings to the networking table. Element and network monitoring, management, and maintenance have always been something of a catch-as-catch-can effort because of the complexity and diversity of elements in a typical service provider s network. SONET overhead includes error-checking ability, bytes for network survivability, and a diverse set of clearly defined management messages.
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Multipoint Circuit Support
When SONET was first deployed in the network, the bulk of the traffic it carried derived from point-to-point circuits such as T-1 and DS-3 facilities. With SONET came the ability to hub the traffic, a process that combines the best of cross-connection and multiplexing to perform a ability known as groom and fill. This means that aggregated traffic from multiple sources can be transported to a hub, managed as individual components, and redirected out any of several outbound paths without having to completely disassemble the aggregate payload. Prior to SONET, this process required a pair of back-to-back multiplexers, sometimes called an M13 (for a multiplexer that interfaces between DS-1 and DS-3). This ability, combined with SONET s discreet and highly capable management features, results in a wonderfully manageable system of network bandwidth control.
Non-Intrusive Monitoring
SONET overhead bytes are embedded in the frame structure, meaning that they are universally transported alongside the customer s payload. Thus, tight and granular control over the entire network can be realized, leading to more efficient network management and the ability to deploy services on an as-needed basis.
New Services
SONET bandwidth is imminently scalable, meaning that the ability to provision additional bandwidth for customers that require it on an as-needed basis becomes real. As applications evolve to incorporate more and more multimedia content and to therefore require greater volumes of bandwidth, SONET offers it by the bucket load. Already, interfaces between SONET and Gigabit Ethernet are being written; interfaces to ATM and other highspeed switching architectures have been in existence for some time already.
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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