Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 1293 / 2536

363-206-285
Glossary
Issue 3 June 2001 GL-17
Product Family 2000
Lucent's line of SONET standard network products providing total network solutions.
PRS
Primary Reference Source
PSU
Power Supply Unit
PVC
Permanent Virtual Circuit
PWR
Power
R
RAM
Random Access Memory
Reactive Maintenance
Refers to detecting 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 any failure conditions that caused a protection
switch to occur clear 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 DDM-2000 OC-3
and OC-12 Multiplexers 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 the other for
protection. See 1+1.
RPP
Reliability Prediction Procedure — Described in Telcordia TR-NWT-00032.
RT
Remote Terminal — An unstaffed equipment enclosure that may have a controlled or
uncontrolled environment.