Paradyne 2001 User Manual page 50

The following pictures show a session in which data-only mode
is used.
1) Jan prepares to send a
large file...
3) Jan initiates the file
transfer. Jan realizes there
is too much background
noise in her office for
DataBurst to have much
effect. She taps her
telephone's hookswitch to
send the file at the
maximum speed.
2) ...and Chris prepares
to receive it.