Identifying where flow control is happening

I am trying to get a better understanding of the computer to modem data
flow in HylaFAX.

In the trace logs, regardless of the DTC-DCE speed (high 115,200 and low
19,200), I see the following:

===============================

Jan 08 01:22:29.99: [ 3595]: MODEM set XON/XOFF/FLUSH: input
interpreted, output disabled
Jan 08 01:22:29.99: [ 3595]: DELAY 200 ms
Jan 08 01:22:30.18: [ 3595]: <-- [11:AT+FTM=146\r]
Jan 08 01:22:30.43: [ 3595]: --> [7:CONNECT]
Jan 08 01:22:30.43: [ 3595]: <-- data [1036]
Jan 08 01:22:30.43: [ 3595]: <-- data [1034]
Jan 08 01:22:30.43: [ 3595]: <-- data [1029]
Jan 08 01:22:30.43: [ 3595]: <-- data [1037]
Jan 08 01:22:30.77: [ 3595]: <-- data [1049]
Jan 08 01:22:30.77: [ 3595]: <-- data [1045]
Jan 08 01:22:30.77: [ 3595]: <-- data [1053]
Jan 08 01:22:30.77: [ 3595]: <-- data [1050]
Jan 08 01:22:31.88: [ 3595]: <-- data [1066]
Jan 08 01:22:32.52: [ 3595]: <-- data [1061]
Jan 08 01:22:33.15: [ 3595]: <-- data [1056]
Jan 08 01:22:33.78: [ 3595]: <-- data [1058]
Jan 08 01:22:33.78: [ 3595]: <-- data [1050]
Jan 08 01:22:34.35: [ 3595]: <-- data [1050]
Jan 08 01:22:34.92: [ 3595]: <-- data [1057]
Jan 08 01:22:35.48: [ 3595]: <-- data [1059]
Jan 08 01:22:36.12: [ 3595]: <-- data [1039]
Jan 08 01:22:36.75: [ 3595]: <-- data [1041]
Jan 08 01:22:37.38: [ 3595]: <-- data [1042]
Jan 08 01:22:38.02: [ 3595]: <-- data [1044]
Jan 08 01:22:38.62: [ 3595]: <-- data [1038]
Jan 08 01:22:39.18: [ 3595]: <-- data [1040]
Jan 08 01:22:39.75: [ 3595]: <-- data [1047]
Jan 08 01:22:40.32: [ 3595]: <-- data [1038]
Jan 08 01:22:40.88: [ 3595]: <-- data [1032]
Jan 08 01:22:41.45: [ 3595]: <-- data [1040]
Jan 08 01:22:42.02: [ 3595]: <-- data [1033]
Jan 08 01:22:42.58: [ 3595]: <-- data [1045]
Jan 08 01:22:43.18: [ 3595]: <-- data [1042]
Jan 08 01:22:43.82: [ 3595]: <-- data [1038]
Jan 08 01:22:44.45: [ 3595]: <-- data [907]
Jan 08 01:22:45.08: [ 3595]: <-- data [2]
Jan 08 01:22:48.02: [ 3595]: --> [2:OK]
Jan 08 01:22:48.02: [ 3595]: MODEM set XON/XOFF/DRAIN: input ignored,
output disabled

===============================

I'm trying to understand why data transfer is taking place in blocks of
a little over 1K, as opposed to some other value.  Is there a
correlation to flow control.  Is this indicative of the points where
flow control kicked in  -- i.e., does Hylafax send data until it gets an
XOff, and that is the point that the amount of data reported in the
trace log is determined and printed?


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