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Glossary
GL-18
Issue 1
December 1997
RTAC
Lucent Regional Technical Assistance Center (1-800-225-RTAC)
RZ
Return to Zero
S
SA
Service Affecting
SCADA
Supervisory Control and Data Acquisition
SD
Signal Degrade
SDH
Synchronous Digital Hierarchy
Self-Healing
Ring architecture in which two or more fibers are used to provide route diversity. Node
failures only affect traffic dropped at the failed node.
SEFS
Severely Errored Frame Seconds
SEO
Single-Ended Operations — The maintenance capability that provides remote access to
all DDM-2000 systems from a single location over the DCC.
Service Line
On a DDM-2000 system, a service (or "working") line is a pair of fibers (one transmit and
one receive) that terminate on an OLIU circuit pack in the
main-1
, or
fn-a-1
, or
fn-b-1
, or
fn-c-1
slot. As defined by the SONET standard, the SONET APS channel is
not defined on a service (or "working") line. (See "Protection Line.")
SES
Severely Errored Seconds — This performance monitoring parameter is a second in
which a signal failure occurs, or more than a preset amount of coding violations
(dependent on the type of signal) occurs.
SF
Super Frame (format for DS1 signal)
Shelf ID
A switch settable parameter with values of from 1 to 8. Used to log into a selected shelf in
a bay using the CIT.
SID
System Identification