September 2001
Beginner
528 pages
14h 14m
English
Content preview from Essential Guide to Telecommunications, The, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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SONET—Synchronous Optical Network
Synchronous optical network (SONET) equipment aggregates many types of traffic into uniform streams onto fiber optic cabling. SONET is capable of transporting traffic in redundant rings. Fifty percent of the rings' capacity is set aside for automatic restoral. If one section of the ring is cut, traffic automatically travels on the redundant fiber in the ring. Bellcore, the central research group jointly owned at that time by the RBOCs, introduced SONET in 1984. The ITU has approved standards for OC speeds. The various OC levels and their speeds are shown in Table 6.5.
When it was developed, SONET was envisioned as carrying synchronous traffic such as T-1, E-1, T-3 and E-3 as well as slower rates uniformly on ...
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