Lucent Technologies LambdaUnite Installation Manual page 344

OTDR
Optical Time-Domain Reflectometer
OUT
Transmit
Outage
A disruption of service that lasts for more than 1 second.
OW (Orderwire)
A dedicated voice-grade line for communications between maintenance and repair personnel.
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P Parameter
A variable that is given a value for a specified application. A constant, variable, or expression
that is used to pass values between components.
Parity Check
Tests whether the number of ones (or zeros) in an array of binary bits is odd or even; used to
determine that the received signal is the same as the transmitted signal.
Pass-Through
Paths that are cross-connected directly across an intermediate node in a network.
Path
A logical connection between the point at which a standard frame format for the signal at the
given rate is assembled, and the point at which the standard frame format for the signal is
disassembled.
Path Terminating Equipment
Network elements in which the path overhead is terminated.
PCB
Printed Circuit Board
PCM
Pulse Code Modulation
PDH
Plesiochronous Digital Hierarchy
PDP
Power Distribution Panel
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G L O S S A R Y
G L - 2 8
Lucent Technologies 365-374-059
Issue a, January 2002