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Glossary
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R
Reactive Maintenance
Refers to decting defects/failures and clearing them.
Remote
See Far-End (FE).
Revertive
A protection switching mode in which, after a protection switch occurs, the equipment returns to
the nominal configuration (that is, the service equipment is active, and the protection equipment is
standby) after the clearing of any failure conditions that caused a protection switch to occur or after
any external switch commands are reset. See Non-Revertive.
Ring
A configuration of nodes comprised of network elements connected in a circular fashion. Under
normal conditions, each node is interconnected with its neighbor and includes capacity for
transmission in either direction between adjacent nodes. Path switched rings use a head-end bridge
and tail-end switch. Line switched rings actively reroute traffic over a protection line.
RPP - Reliability Prediction Procedure
Described in Telcordia Technologies TR-NWT-00032.
RT - Remote Terminal
An unstaffed equipment enclosure that may have a controlled or uncontrolled environment.
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S
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.
SEO - Single-Ended Operations
The maintenance capability that provides remote access to all Alcatel-Lucent 1850 TSS-5 systems
from a single location over the DCC.
Service Line
On a Alcatel-Lucent 1850 TSS-5 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 C-1 slots. As
defined by the SONET standard, the SONET APS channel is not defined on a service line. See
Protection Line.
SES - Severely Errored Seconds
This performance monitoring parameter is a second in which a signal fail occurs, or more than a
preset amount of coding violations (dependent on the type of signal) occurs.
SF - Super Frame
The format for DS1 signals.
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GL - 2 4
Terms and Definitions
365-372-403R5.1
Issue 1 November 2008
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