Alcatel-Lucent 1665 Installation Manual page 425

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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 1665 DMX, a protection line is a pair of fibers that terminate an OLIU circuit pack
in the Main-2, A-2, B-2, C-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.
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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.
Ring (0x1) Low-Speed Interface
Formerly referred to as dual 0x1 or single 0x1. In ring applications, the Alcatel-Lucent 1665 DMX
may use a 0x1 interface, meaning both fibers carry service, as opposed to a linear (1+1) low-speed
interface where one fiber is used for service and other for protection. See 1+1.
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 1665 DMX systems
from a single location over the DCC.
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365-372-304R7.1
Issue 2 March 2008
Terms and definitions
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