Specifications

V.3229 / V.3229L <C#>-5
8
Protocols
If the serial port speed exceeds that of the modem
connection, characters may be sent by the DTE to the
modem faster than it can send them to the remote
modem. The modem holds characters in an internal
buffer until they can be transmitted. When this buffer
is full, the modem uses flow control to stop data from
the DTE. As the modem continues to transmit data
and the buffer empties, flow control is again used to
start data from the DTE.