In the example below, the flow control on the minicomputer works as follows:
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Mux
Link
Channel
Mini-
Computer
A.
B.
C.
D.
mux process
data to the link
mux buffers
full
mux buffers
empty
mux processes
data to the link
Data
Flow Control
off
Flow Control
on
Data
A. Data volume from the mini for any particular channel is appropriate for the mux to process and transfer
on to the link.
B. Data overwhelms a channel's mux buffer and the mux sends a stop data Flow Control (OFF) signal to the
mini stopping data output.
C. The mux buffer sufficiently enpties to allow additional data transfer, so the mux sends a start data Flow
Control (ON) signal to the mini.
D. Data from the mini again flows through the channel.
