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DataBurst
In VoiceSpan mode, data transmission occurs at 4800 bps when
there is sound to transmit at the same time. However, whenever
the transmitting DataPort 2001 detects silence, it sends data at
the highest rate possible (up to 14,400 bps). When there is new
sound to transmit, the DataPort 2001 reverts to a data rate of
4800 bps. Switches between the high and low rates are made
so quickly that they do not appreciably alter the sounds you
hear.
This feature is called DataBurst , and can be enabled or
disabled with the AT command %VA. (It also is enabled when
the VoiceSpan Defaults AT command %VF is issued.) Enabling
DataBurst on your DataPort 2001 affects the audio and data
being sent to you. The rate at which your DataPort 2001
transmits data is affected by whether DataBurst is enabled in
the remote DataPort 2001.
During a telephone conversation a DataPort 2001 usually can
transmit data at high speed most of the time. This is because
one party normally is silent while the other speaks, and even the
speaker must occasionally pause for breath. When music or
other nearly constant sound is being transmitted, the advantage
of DataBurst is significantly reduced.
Data-Only Mode
To force data to be transmitted at the highest possible rate, you
can momentarily disable the audio in one or both directions. This
is done by hanging up your telephone, by pressing the
telephone hookswitch briefly (called a "flash hook"), or by
issuing a Data Mode Control command from your computer.
(See Table 5-2.) All three methods enable high-speed data
transfer and disable audio transmission in one direction. The
other user can continue to talk and be heard by the user in
data-only mode, but receives a beeping alert tone on the
telephone receiver that means the other user cannot
communicate by voice.
Simultaneous audio and data mode resumes when you lift the
telephone receiver from the hook, perform another flash hook,
or issue a Data Mode Control command.
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