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<strong>AT</strong> <strong>Commands</strong> <strong>Reference</strong> <strong>Manual</strong><br />
+ITF - Transmit Flow Control Thresholds<br />
The +ITF command determines the flow control thresholds used by the modem for<br />
transmit data from the DTE.<br />
This optional compound parameter allows the DTE to determine the input buffer size in<br />
the modem for data on circuit 103 (transmit data) from the DTE, to control the thresholds<br />
used for flow control of such data, and to control how often the modem reports to the<br />
DTE the number of octets in this buffer. The DTE can adjust its own thresholds for flow<br />
control of data on circuit 104 (received data) from the modem.<br />
Syntax<br />
+ITF=[[,[,]]]<br />
Defined Values<br />
<br />
<br />
<br />
Determines the threshold, in octets, above which the modem<br />
will generate a flow off signal. Applicable in Synchronous<br />
Access and Frame Tunneling modes. Default value is<br />
255.<br />
For the and subparameters, the input buffer is<br />
assumed to reside between the modem’s V.24 interface and<br />
the Synchronous Access protocol layer; i.e., the buffer count<br />
includes all octets, including EM codes, received from the<br />
DTE, with the exception of DC1 and DC3 if these are used to<br />
signal flow control.<br />
The modem returns the ERROR result code if the DTE<br />
specifies that the subparameter be set to a value less<br />
than or equal to the subparameter; in this case, the<br />
current parameter value settings are not modified.<br />
Determines the threshold, in octets, below which the modem<br />
will generate a flow on signal. Applicable in Synchronous<br />
Access and Frame Tunneling modes. Default value is<br />
64.<br />
Not supported. A fixed value of zero is used and reported.<br />
Reporting Selected Options<br />
The modem sends a string of information text to the DTE consisting of selected<br />
options in response to the following command:<br />
+ITF?<br />
The response is:<br />
+ITF: ,,<br />
Example:<br />
+ITF?<br />
+ITF: 255,64,0 Default values<br />
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