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SONET relies on a timing scheme called plesiochronous timing. As implied earlier, the word sounds like one of the geological periods that we all learned in geology classes (Jurassic, Triassic, Plesiochronous, Plasticene). Plesiochronous derives from Greek and means almost timed. Other words that are commonly tossed about in this industry are asynchronous (not timed), isochronous (constant delay in the timing), and synchronous (timed). SONET is plesiochronous in spite of its name (SYNCHRONOUS Optical Network) because the communicating devices in the network rely on multiple timing sources and are therefore enabled to drift slightly relative to each other. This is fine, because SONET has the capability to handle this with its pointer adjustment capabilities. The devices in a SONET network have the luxury of choosing from any of five timing schemes to ensure accuracy of the network. As long as the schemes have Stratum 4 accuracy or better, they are perfectly acceptable timing sources. The five are discussed here:
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Line timing Devices in the network derive their timing signal from the arriving input signal from another SONET device. For example, an add-drop multiplexer that sits out on a customer s
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premises derives its synchronization pulse from the incoming bit stream and might provide further timing to a piece of CPE that is out beyond the ADM.
Loop timing Loop timing is somewhat similar to line timing; in loop timing, the device at the end of the loop is most likely a terminal multiplexer. External timing The device has the luxury of deriving its timing signal directly from a Stratum 1 clock source. Through timing Similar to line timing, a device that is through timed receives its synchronization signal from the incoming bit stream, but then forwards that timing signal on to other devices in the network. The timing signal then passes through the intermediate device. Free running In free running timing systems, the SONET equipment in question does not have access to an external timing signal and must derive its timing from internal sources only.
One final point about SONET should be made. When the standard is deployed over ring topologies, two timing techniques are used. Either external timing sources are depended upon to time network elements, or one device on the ring is internally timed (free running) while all the others are through-timed.
SONET Summary
Clearly, SONET is a complex and highly capable standard designed to provide high-bandwidth transport for legacy and new protocol types alike. The overhead that it provisions has the capability to deliver a remarkable collection of network management, monitoring, and transport granularity. The European Synchronous Digital Hierarchy (SDH) shares many of SONET s characteristics, as we will now see. SONET, you will recall, is a limited North American standard, for the most part. SDH, on the other hand, provides high-bandwidth transport for the rest of the world. Most books on SONET and SDH cite a common list of reasons for their proliferation, including a recognition of the importance of the global marketplace and a desire on the parts of manufacturers to provide devices that will operate in both SONET and SDH environments, the global expansion of ring architectures, a greater focus on network
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management and the value that it brings to the table, and massive, unstoppable demand for more bandwidth. To those, add an increasing demand for high-speed routing capability to work hand-in-glove with transport; the deployment of DS-1, DS-3, and E-1 interfaces directly to the enterprise customer as access solutions; and a growth in demand for broadband access technologies such as cable modems, the many flavors of DSL, and two-way satellite connectivity. Reasons for the widespread use of SONET and SDH also include the ongoing replacement of traditional circuit-switched network fabrics with packet-based transport and mesh architectures, a renewed focus on the SONET and SDH overhead with an eye toward using it more effectively, and convergence of multiple applications on a single, capable, high-speed network fabric. Most visible among these is the hunger for bandwidth; according to consultancy RHK, global volume demand will grow from approximately 350,000 terabytes of transported data per month in April 2000 to more than 16 million terabytes of traffic per month in 2003. And who can argue
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