S
- SDH (Synchronous Digital Hierarchy).
The ITU-T-defined world standard of transmission whose base transmission level is 52 Mbps (STM-0) and is equivalent to SONET's STS-1 or OC-1 transmission rate.
- section.
The span between two SONET network elements capable of accessing, generating, and processing only SONET section overhead; this is the lowest layer of the SONET protocol stack with overhead.
- section overhead.
Nine bytes of overhead accessed, generated, and processed by section-terminating equipment; this overhead supports functions such as signal framing and performance monitoring.
- SES (severely errored second).
A second in which a signal failure occurs, or more than a preset amount of coding violations (dependent on the type of signal) occurs. ...
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