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TOPS VSN Log and alarm messages
20. Abbreviations

A list of abbreviations used in this Publication follows:

ACPE Application call processing engine
CLLI Common language location indicator
DD Data dictionary
DMS Digital multiplex system
DNC Dynamic network control
DTMF Dual tone multifrequency
IEEE Institute of Electrical and Electronic Engineers
IO Input output
LDB Locality database
MMI Man machine interface
NT Northern Telecom
OM Operational measurement
PCM Pulse code modulation
PRU Program resource unit
RM Resource manager
SAS System administration service
SDM Service data manager
SRU Shared resource unit
TOPS Traffic operator position system
VI Voice interface
VIRM VI resource manager
VNM Voice network manager
VSN Voice service node
VTP Virtual transport protocol