Abbreviations Glossary
SPM
System Programming and Maintenance
SSN
Switched Services Network
TEI
terminal equipment identifier
TDM
time-division multiplexing
T/R
tip and ring
TSI
time-slot interchanger
TTR
touch-tone receiver
UDM
universal data module
UPAM
Universal Paging Access Module
UPS
uninterruptible power supply
V A
volt-ampere
VAC
volts AC
VAN
value-added network
VAU
voice announcement unit
VMI
voice messaging interface
V.T.
voice terminal
W
watts
WATS
wide area telecommunications service
ZCS
zero code suppression
ABB-2
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