Glossary
GL-16 Issue 3 June 2000
POP
Points of Presence
Port
The physical, electrical, or optical interface on a system. For example, DS1, DS3, EC-1, OC-3, and
OC-12. See Channel.
Port State Provisioning
A feature that allows a user to suppress alarm reporting and performance monitoring during provi-
sioning by supporting multiple states (automatic, in-service and not monitored) for low speed ports.
See Channel State Provisioning.
POTS
Plain Old Telephone Service
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 exam-
ple, 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
DDM-2000 FiberReach system, a
protection
line is a pair of fibers that terminate on an OLIU circuit
pack in the
main
slot. (See Service Line.)
PRM
Performance Report Message
PROTN
Protection
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
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