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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Glossary and Abbreviations
GL-5
PN
Port network
PNC
Port Network Connectivity—an alternative to either the direct-connect or center stage switch
configurations for connecting the processor port network (PPN) to one or more expansion port
networks (EPNs).
PPN
Processor port network
PRI
IDSN primary rate interface
PSTN
Public switched telephone network
PVC
Permanent Virtual Circuit—a virtual circuit that provides the equivalent of a dedicated private line
service over a packet switching network between two DTEs (the path between users is fixed). A
PVC uses a fixed logical channel to maintain a permanent association between the DTEs. Once a
PVC is defined, it requires no set-up operation before data is sent and no disconnect operation
after data is sent. ATM-CES uses PVCs as the basis for the permanent connections, sometimes
called virtual trunking.
Q
QoS
Quality of Service
R
RDI
Remote defect indication
S
SDH
Synchronous Digital Heirarchy—Used outside the United States, it’s an ITU standard for
transmission in synchronous optical networks.
SONET
Synchronous Optical NETwork—a family of optical transmission channels for speeds from about
45 Mbps to 2.4 Gbps and higher.
STM-1
Similar to OC-3 but used outside the United States.