the section layer.
Section Adaptation (SA)
Function that processes the AU-pointer to indicate the phase of the VC-3/4 POH relative
to the STM-N SOH and assembles/disassembles the complete STM-N frame.
Section Overhead (SOH)
Capacity added to either an AU-4 or to an assembly of AU-3s to create an STM-1.
Always contains STM-1 framing and can contain maintenance and operational functions.
SOH can be subdivided into MSOH (multiplex section overhead) and RSOH (regenerator
section overhead).
SEF
Support Entity Function (in NE)
Self-healing
A network’s ability to automatically recover from the failure of one or more of its
components.
Server
Computer in a computer network that performs dedicated main tasks that require
generally sufficient performance. See also Client.
Service
The operational mode of a physical entity that indicates that the entity is providing
service. This designation will change with each switch action.
Severely Errored Frame Seconds (SEFS)
A performance monitoring parameter.
Severely Errored Second (SES)
A second that has a binary error ratio. SES is used as a performance monitoring
parameter.
Severity
See Alarm Severity
SFP
Small Form-Factor Pluggable Optics
SH
Short Haul
SI
Synchronous Interface
SIB
Subrack Interface Box
SLC
Subscriber Loop Carrier
Glossary
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Issue 4, November 2006
