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UBR (Unspecified Bit Rate), 91, 98
UDP (User Datagram Protocol), 653
UMTS (Universal Mobile Telecommunications System), 653
UMTS Terrestrial Radio Access Network (UTRAN), 652
UNI (User-to-Network Interface) DCE, 89
uninterruptible power supplies (UPSs), 652
unit numbers for Frame Relay, 73
units, 652
Universal Mobile Telecommunications System (UMTS), 653
unnumbered interfaces, 124–125, 125
configuring, 125–126
verifying, 126
Unspecified Bit Rate (UBR), 91, 98
Update messages, 653
Update timers, 653
upgrades, software, 30–32
UPSs (uninterruptible power supplies), 652
upto match type, 653
user accounts, 10–14, 12, 14, 45–48
User Datagram Protocol (UDP), 653
User-to-Network Interface (UNI) DCE, 89
UTC time zone, 27
UTRAN (UMTS Terrestrial Radio Access Network), 652
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