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Chapter 17: Error Correction, Flow Control, Data Compression
\Q3
Enables bidirectional RTS/CTS hardware flow control.
Dropping RTS/CTS stops data flow. Raising RTS/CTS
restarts it.
\Q4
Enables unidirectional software flow control from the ISDN
TA/V to the DTE, using XON/XOFF characters.
\Q5
Enables unidirectional software flow control from the DTE
to the ISDN TA/V, using XON/XOFF characters.
\Q6
Enables unidirectional hardware flow control from the DTE
to the ISDN TA/V, using RTS signal.
17.3.1 XON/XOFF P
ASS
-T
HROUGH
C
ONTROL
Where flow control of the ISDN TA/V is controlled from the local DTE using
XON/XOFF characters (
\Q1
or
\Q5
is set), the
\X
command setting
determines whether these flow-control characters are passed over the line to
the remote device or not.
\X0
The ISDN TA/V performs flow control according to the
XON/XOFF characters received from the DTE, but doesn’t
pass these characters through to the remote device.
\X1
The ISDN TA/V performs flow control and passes the
XON/XOFF characters to the remote device.
The setting of this command is ignored if the connected ISDN TA/Vs are
configured to use an error-correction protocol, since the error correction
routine automatically handles flow control between the two devices.
17.4 Buffer Disconnect Timer
S-Register S49 determines, in seconds, how long the ISDN TA/V will continue
to try to send data which is in its transmit buffers, after being locally
commanded to disconnect. This timer also applies to data in the receive
buffers when the ISDN TA/V is commanded to disconnect from a remote
site.
The default value for this timer is
S49=10
, allowing ten seconds for the ISDN
TA/V to empty its transmit or receive buffers before disconnecting. This value
may be altered using the
S49=
n
command, where
n
is a value from 0 to 255.
Setting a value of 0 will force an immediate disconnect (data within the ISDN
TA/V’s buffers will be discarded).
