DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Glossary and abbreviations
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TTR
Touch-tone receiver
TTTTerminating trunk transmission
TTTN
See tandem tie-trunk network (TTTN).
TTY
Teletypewriter
U
UAP
Usage-allocation plan
UART
Universal asynchronous transmitter
UCD
Uniform call distribution
UCL
Unrestricted call list
UDP
See Uniform Dial Plan (UDP).
UL Underwriter Laboratories
UMUser manager
Uniform Dial Plan (UDP)
A feature that allows a unique 4- or 5-digit number assignment for each terminal in a multiswitch configura-
tion such as a DCS or main-satellite-tributary system.
UNMA
Unified Network Management Architecture
UNP
Uniform numbering plan
UPS
Uninterruptible power supply
USOP
User service-order profile
UUCP
UNIX-to-UNIX Communications Protocol
UUIUser-to-user information