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Terms and definitions
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Proactive Maintenance
Refers to the process of detecting degrading conditions not severe enough to initiate protection
switching or alarming, but indicative of an impending signal fail or signal degrade defect (for
example, performance monitoring).
Protection Line
As defined by the SONET standard, the protection line is the pair of fibers (one transmit and one
receive) that carry the SONET APS channel (K1 and K2 bytes in the SONET line overhead). On a
Alcatel-Lucent 1850 TSS-60, a protection line is a pair of fibers that terminate an OLIU circuit pack
in the Main-2, D-2, or G-2 slots. See Service Line.
Product Family 2000
Lucent's first line of SONET standard network products providing total network solutions.
PTM
Pluggable Transmission Module optics.
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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.
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365-372-603R2.0
Issue 1 January 2009
G L- 2 5
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