US Robotics 56K USB Modem User Manual page 39

\X<value>—XON/XOFF Pass Through
Use this command to restrict the XON/XOFF flow control to the local DCE for processing or have the local
DCE send the flow control characters to the remote DCE.
Result codes:
• OK if <value> = 0—1.
ERROR if <value> ≠ 0—1.
•
Table 49. \X<value> Commands
Command
\X0 The modem processes XON/XOFF flow control characters locally (default).
\X1 The modem passes XON/XOFF flow control characters.
-C<value>—Send Data Calling Tone
Data calling tone is a tone of a certain frequency and cadence, as specified in V.25, which allows remote
data/FAX/voice discrimination. The frequency is 1300 Hz with a cadence of 0.5 s on and 2.0 s off. The
setting of the homologation parameter 1f, calling tone flag, determines if –C (same as S35) is enabled. If
the calling tone flag is set to 1, this command is valid. Otherwise, this command has no effect.
Note: This command's default value may vary based on country selection.
• Range: 0—1.
• Default: 0.
-V90=<rate>—V.90 Downstream Rate Control
Use this command to control the V.90 downstream rate. This command has three forms and is used to
view the current settings, view the range of input values, enable or disable V.90, or set the downstream
V.90 rate to a specific value.
Result codes:
• OK if <rate> = 0—21.
ERROR if <rate> ≠ 0—21.
•
Table 50. -V90 Extended Syntax Commands
Syntax
-V90=<rate> Disables or selects the V.90 downstream rate.
-V90? Displays the current value.
-V90=? Displays the range of values for the variable <rate>.
Table 51. -V90=<value> Commands
Command
-V90=0 Disables V.90.
-V90=1 Selects auto rate (default).
-V90=2 Selects 28000 bits/s.
-V90=3 Selects 29333 bits/s.
-V90=4 Selects 30666 bits/s.
Function
Function
Function
56K USB Modem
User Guide
Command Reference - 33