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SAN

Storage Area Network
 - A special network designed to interconnect multiple storage devices at high speed. Fibre Channel is often used.

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S Bus

Device used to connect data terminals such as video conferencing units to ISDN lines.

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SDH

Synchronous Digital Hierarchy - 
A synchronous transmission system used for telecommunications worldwide, operating up to many Gbit/s.

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Serial Port

Port in a PC used for the connection of external equipment such as an external modem. Also used for connection of call-logging, CTI, etc.

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Server

A computer, or software package, that provides a specific kind of service to client software running on other computers. The term can refer to a particular piece of software or to the machine on which the software is running. A single server machine can have several different server software packages running on it, thus providing many different services to clients on the network.

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SHDS

Short Haul Data Service