363-206-208
Glossary
Issue 5 June 2000 GL-17
RZ
Return to Zero.
S
SA
Service Affecting.
SD
Signal Degrade.
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 OC-3 system, a service (or "working") line is a pair of fibers (one trans-
mit 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 (depen-
dent 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. Also, Shelf Identification. See NOTE, 10-12.
Site ID
A switch settable parameter with values of from 1 to 8. Displayed on SYSCTL circuit
pack to indicate to which site the user panel alarms and LEDs apply.
SONET
Synchronous Optical Network.
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