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Terms Found:


U-Law
UART
UCD
UCID
UDA
UDP
UDP
UDP flooding
UDP port selection
UHF
ultra high frequency (UHF)
ultra low frequency (ULF)
ultraviolet
UM
unauthoritive data
unbundled service
UNC
UNI
unicast
unicast transmission
Unified Messaging (UM)
Uniform (Universal) Dial Plan
Uniform Call Distribution (UCD)
Uniform Resource Locator (URL)
Uninterruptible Power Supply (UPS)
Universal Asynchronous Receiver/Transmitter
Universal Call ID (UCID)
Universal Serial Bus (USB)
Universal Service Fund (USF)
Universal Synchronous Receiver/ Transmitter (USRT)
UNIX
UNIX to UNIX Copy Program (UUCP)
unnumbered frames
unordered list
UnPBX
unroutable protocol
unshielded twisted pair (UTP)
up-selling
upgrade
uplink port
upload
UPS
upstream
URG
Urgent (URG)
URL
usage sensitive pricing (USP)
USB
USB adapter
Usenet
user
User Agent
User Datagram Protocol (UDP)
User-Network Interface (UNI)
User-to-Network Interface (UNI) 3.0
username
USF
USRT
utility
utilization
UTP
UUCP
Uuencode
UV