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Technology Stocks : Ciena (CIEN) -- Ignore unavailable to you. Want to Upgrade?

To: Daniel G. DeBusschere who wrote (2319)	7/11/1998 9:52:00 AM
From: CMS27	Read Replies (1) \| Respond to of 12623

Here are the definitions from osicom.com Let the home page load and on the index at the very bottom click on Glossary Sonet (Synchronous Optical NETwork) Transport network for synchronously multiplexed tributary signals. The standard defines a set of transmission rates, signals and interfaces for fiber optic transmission. Sonet is also an emerging standard proposed by Bellcore (Bell Communications Research, the standards organization of the US Bell Operating companies) for a synchronous optical transmission protocol. The broadband fiber network it supports is formed by a family of network elements conforming to the Sonet interface requirements. The basic electrical signal runs at 51.840Mbit/s - approximately 51 times the bandwidth of a standard US, Ti leased line (1.544Mbit/s). Sonet grows in multiples of the basic signal into the multi-Gigabit range. It is intended to be able to add and drop lower bit rate signals from the higher bit rate signal without needing electrical demultiplexing. TDM (Time Division Multiplexer/Multiplexing) Multiplexer which apportions the time available on its Composite link between its channels, interleaving data from successive channels. The method divides up digital channels to make maximum use of their bandwidth, by taking input from each source in turn. TDMs use one of two methods to achieve this, bit interleaving for synchronous protocols and character interleaving for asynchronous protocols.