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TDMA (time division multiple access)
A method of digital wireless communications transmission
allowing a large number of users to access (in sequence)
a single radio frequency channel without interference
by allocating unique time slots to each user within
each channel.
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Telecommunications
Act of 1996
Legislation designed to spur competition among
wireless and wireline carriers. Signed into law by
President Clinton Feb. 8, 1996.
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Telematics
The integration of wireless communications, vehicle
monitoring systems and location devices.
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Termination
charges
Fees that wireless telephone companies pay to
complete calls on wireline phone networks or vice
versa.
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Third-Generation
(3G)
A new standard that promises to offer increased
capacity and high-speed data applications up to 2
megabits. It also will integrate pico-, micro- and
macrocellular technology and allow global roaming.
The next generation of wireless technology beyond
personal communications services. The World Administrative
Radio Conference assigned 230 megahertz of spectrum
at 2 GHz for multimedia 3G networks. These networks
must be able to transmit wireless data at 144 kilobits
per second at mobile user speeds, 384 kbps at pedestrian
user speeds and 2 megabits per second in fixed locations.
The International Telecommunication Union seeks to
coordinate 3G standards through its International
Mobile Telecommunications-2000 project. In early July,
the ITU received 10 proposals for 3G systems and is
currently holding a series of meetings to evaluate
the specifications.
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Triangulation
The lengthy process of pinning down a caller's
location using radio receivers, a compass and a map.
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Tri-mode
handset
Phones that work on three frequencies, typically
using 1900 MHz, 800 MHz digital or reverting to 800
MHz analog cellular when digital is not available.
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Triple
band
A network infrastructure or wireless phone designed
to operate in three frequency bands.
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Trunking
Spectrum-efficient technology that establishes
a queue to handle demand for voice or data channels.
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ULS
(Universal Licensing System)
The new Wireless Telecommunications Bureau program
under which electronic filing of license applications
and reports of changes to licenses creates a database
that can be accessed remotely for searches. Using
ULS, for example, the user can learn all the specialized
mobile radio licenses in a given region.
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UMTS
(Universal Mobile Telecommunications System)
Europe's approach to standardization for third-generation
cellular systems.
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Universal
service
The government's aim, starting in the 1930s,
of providing phone service to all, regardless of distance
from the switch or ability to pay. Today, universal
service encompasses those aims, plus a subsidy to
public schools, libraries and rural health care facilities
for telecom services.
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