Black Box 32144 Manual page 160

MODEM 32144
DCE Pass-through Flow Control
Hayes, V.25 bis, Dumb, Leased-line
modes (except V.33)
This option affects DCE-DTE
flow control only. It is effective only
if error correction or buffer-
mode/speed conversion is enabled.
ENABLE. The modem will pass
flow-control characters received
from the remote modem to the
local DTE.
DISABLE. The modem will not
pass flow control characters from
the remote modem to the local
DTE.
Link Flow Control
Hayes, V.25 bis, Dumb, Leased line
modes (except V.33)
This option is effective only if
buffer-mode/speed conversion is
enabled and a buffer link without
error correction is established. Do
not enable Link Flow Control if
binary data will be transmitted or
received.
ENABLE. The modem will check
for X-ON/X-OFF (DC1/DC3) flow-
control characters received from
the remote modem to determine
whether to stop or start/restart
data transmission to the remote
modem. A DC3 control character
will cause the modem to stop data
transmission and hold data in its
buffer until it receives a DC1
68
control character (which instructs
the modem to resume
transmission).
If Link Flow Control is enabled
with DTE-DCE flow control set to
RTS on/off and DCE-DTE flow
control set to CTS on/off on both
the originating and answering
modems, and both modems
establish a buffer-mode
connection, the modems will
exchange flow control signals
across the link in the form of DC1
and DC3 characters. If the data
being exchanged contains a DC3
character (e.g., binary or
executable files), this will signal the
remote modem to halt and buffer
all data from the remote DTE until
the local DTE sends a DC1
character.
DISABLE. The modem will
ignore XON/XOFF (DC1/DC3)
flow -control characters received
from the remote modem.
SLAVED. Link flow control is
controlled by the DCE-DTE Flow
Control option. If DCE-DTE Flow
Control is set to NONE or CTS,
Link Flow Control is disabled.
Otherwise it is enabled.