Lucent Technologies LambdaUnite Installation Manual page 345

PI
Power Interface
Pipe mode (Adaptive-rate tributary operation of a port)
Mode of operation of a port in which tributaries are not explicitly provisioned for the expected
signal rates. The signal rates are automatically identified.
Platform
A family of equipment and software configurations designed to support a particular application.
Plesiochronous Network
A network that contains multiple subnetworks, each internally synchronous and all operating at
the same nominal frequency, but whose timing may be slightly different at any particular
instant.
PM (Performance Monitoring)
Measures the quality of service and identifies degrading or marginally operating systems (before
an alarm would be generated).
PMD (Polarization Mode Dispersion)
Output pulse broadening due to random coupling of the two polarization modes in an optical
fiber.
POH (Path Overhead)
Informational bytes assigned to, and transported with the payload until the payload is
de-multiplexed. It provides for integrity of communication between the point of assembly of a
virtual container and its point of disassembly.
Pointer
An indicator whose value defines the frame offset of a virtual container with respect to the
frame reference of the transport entity on which it is supported.
POP
Point of Presence
Port (also called Line)
The physical interface, consisting of both an input and output, where an electrical or optical
transmission interface is connected to the system and may be used to carry traffic between
network elements. The words "port" and "line" may often be used synonymously. "Port"
emphasizes the physical interface, and "line" emphasizes the interconnection. Either may be
used to identify the signal being carried.
Port State Provisioning
A feature that allows a user to suppress alarm reporting and performance monitoring during
provisioning by supporting multiple states (automatic, in-service, and not monitored) for
low-speed ports.
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Issue a, January 2002
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