| Air Interface |
In mobile phones, the 'air interface' denotes
the specification of the radio transmission between base station
and mobile phone. It defines the frequency use (frequencies),
the bandwidth of the individual radio channels (channels), the
encoding methods used (W-CDMA, TD-CDMA, cdma2000) and other
quantities used by the radio technology. |
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| AMPS |
Advanced Mobile Phone System. North American analog
cellular phone system. Operates in the 800 MHz frequency band.
AMPs is used in South America and Asia Pacific. It has not been
deployed in Eastern Europe. |
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| Analogue |
The technology which until recently was the norm
for mobile phones, for example, 1G. It gives lower call quality
and a major security risk. |
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| ANSI-41 |
Formerly known as IS-41 or TIA/EIA-41, this is
a wireless intersystem operation standard/protocol used for
switch-to-switch and network-to-network coordination with IS-136
and certain 3G standards. The core network for cdma2000 is based
on the ANSI-41 standard. For 3G, ANSI-41 and GSM MAP networks
will be interconnected through a signalling converter to realize
global roaming. |
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| Antenna |
A device used for receiving or transmitting signals. |
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| ARPU |
Average revenue per customer. |
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| ARIB |
Association of Radio Industry and Businesses.
A Japanese standard-setting body, organizational partner of
the 3GPP and 3GPP2. |
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| ATM |
Asynchronous Transfer Mode. A high bandwidth,
controlled-delay fixed-size packet switching and transmission
system. Uses fixed-size packets also known as "cells"; ATM is
often referred to as "cell relay." ATM will provide the basis
for future broadband ISDN standards. |
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| Asynchronous Transmission |
A mode in which the sending and receiving serial
hosts know where a character begins and ends because each byte
is framed with additional bits, called a start bit and a stop
bit. A start bit indicates the beginning of a new character;
it is always 0 (zero). A stop bit marks the end of the character.
It appears after the parity bit, if one is in use. |
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| ATM |
Asynchronous Transfer Mode A type of networking
that supports high bandwidth throughput and simultaneous transfer
of voice, video and data. It is a form of packet transmission
using fixed-size packets, called cells. ATM transfers a cell
to the network only when data to be transmitted actually exists. |
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| Auction |
A method used by national governments trying to
sell 3G licenses to the highest bidders and is used by many
European countries that proved to be a disaster for operators
of its excessive bidding cost. |
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