Cisco ONS 15454 SDH Specifications Page 478

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Glossary
GL-16
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
P
Passive devices
Components that do not require external power to manipulate or react to electronic output. Passive devices include capacitors,
resisters, and coils.
Path Layer
The segment between the originating equipment and the terminating equipment. This path segment may encompass several
consecutive line segments or segments between two SONET devices.
Payload
Portion of a cell, frame, or packet that contains upper-layer information (data).
PCM
Pulse Code Modulation.
PCMCIA
Personal Computer Memory Card International Association.
PCN
Product Change Notice(s).
PDI-P
STS Payload Defect Indication - Path.
Ping
(Packet internet grouper). ICMP echo message and its reply. Often used in IP networks to test the reachability of a network
device.
Pointer justification
In SONET, the mechanism used to compensate for frequency and phase variations. Pointer justification counts indicate timing
errors on SONET networks.
POP
Point of Presence.
PM
Performance Monitoring.
PPMN
(Path-Protected Mesh Network). PPMN extends the protection scheme of a unidirectional path switched ring (UPSR) beyond
the basic ring configuration to the meshed architecture of several interconnecting rings.
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