Glossary-5
Dynamic Transmit Level
Adjustment
The capability to automatically calculate
optimal transmit levels to compensate for
cellular telephone signal distortion.
EIA
Electronic Industries Association.
Escape code
A series of three consecutive characters
(preceded and followed by a guard time of one
second or user-selectable setting) that is sent to
the modem, causing it to exit connection state
and enter command state.
Factory default switch settings
The configuration switch settings that are in
effect when the modem is shipped from the
factory.
Flow control
The use of characters or V.24 (EIA232) signals
to start and stop the flow of data to avoid data
loss during buffering.
Full duplex
Communication method by which data can be
transmitted in two directions simultaneously.
Guard time
An interval of time that must be present before
the first character and after the last character of
the escape code in order for the modem to
recognize the escape code and enter command
state. Also, the time that precedes and follows
the remote access attention character sequence.
Guard tone
A constant tone generated by the answering
modem during V.22 and V.22bis connections.
Half duplex
Communication method by which data can be
transmitted in two directions, but in only one
direction at a time.
ITU-T (Formerly CCITT)
International Telegraph and Telephone Union
— Telecommunication Standardization
Section, the international organization that
decides upon recommended communication
protocol standards.
ITU-T V.21
The V.21 protocol is used for 300 bps full-
duplex connections. V.21 mode is not
supported for synchronous connections; V.54
digital and analog; or LAPM connections.
Term
Definition
