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unbundled network elements (UNE), 197, 333
unidirectional antennas, 44–45
uniform resource locators (URLs), 165
universal serial bus (USB) cards, 232–234, 293
University of California, Berkeley, 69
University of Maryland, 69
unlicensed national information infrastructure (UNII), 48, 110–111, 204, 205–208, 310, 313
unlicensed spectrum, 10
upgrades, 266
user agents (UA), SIP, 167
user datagram protocol (UDP), 91, 99, 163
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