Modem-To-Modem Flow Control - Paradyne 3760 User Manual

Advanced Modem Concepts
Figure D-2. Various Flow Control Methods

Modem-to-Modem Flow Control

Finally, flow control can occur between two modems. If
Modem B's buffer begins to fill, and error control is disabled, it
can issue an XOFF to Modem C (see modem-to-modem flow
control in Figure D-2). In turn, Modem C will tell Computer D to
stop sending data. Data flow can be resumed by Modem B
issuing an XON to Modem C.
In this case, the modems are normally configured for
XON/XOFF flow control and have modem-to-modem flow
control enabled (see the \G command).
D-6
Issue 1 November 1994