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Glossary and Abbreviations
Issue 5 January 1998 GL-49555-230-024
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
UM
User manager
Uniform Dial Plan (UDP)
A feature that allows a unique 4- or 5-digit number assignment for each terminal in a multiswitch
configuration 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
UUI
User-to-user information