HP MSR2000/3000/4000 Router Series Layer 2 - WAN Command Reference

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Table 16 describes commonly used AT commands. Support for AT commands varies with modems.
Table 16 AT commands in common use
Command Descri
p
tion
A
Forces the modem to go off-hook in answer mode. If a call is coming in, the modem will try
to answer it without waiting for the ringtone. This command is useful when manual answer
mode is used.
Bn
Sets the modulation protocol preference.
Available options:
• B0—Selects the ITU V.22 mode. The transmission speed is 1200 bps.
• B1—Selects the Bell 212 mode. The default transmission speed is 1200 bps.
• B2/B3—Cancels the ITU V.23 backward channel.
• B15—Selects the ITU V.21 mode. The transmission speed is 300 bps.
• B16—Selects the 103J mode. The transmission speed is 300 bps. This setting is the
default for Compaq Presario 192-VS and Compaq Presario 288-VS modems.
Dn
Dials a telephone number. The n argument represents the dial string. In pulse dialing mode,
the modem ignores nonnumeric characters.
En
Controls echo of commands to the configuration terminal.
Available options:
• E0—Disables echo of commands to the configuration terminal.
• E1—Enables echo of commands to the configuration terminal. This option is the default.
Hn
Sets the method to terminate a call.
Available options:
• H0—Forces modem on-hook to hang up the line.
• H1—Forces modem off-hook to answer or dial.
In
Displays modem information and results of checksum tests on firmware.
Available options:
• I0/I3—Displays the default transmission speed and controller firmware version.
• I1—Runs a checksum on the ROM and displays the result.
• I2—Runs a checksum on the ROM and displays the checksum status:
{ OK—The checksum is correct.
{ ERROR—The checksum is incorrect.
• I4—Displays the hardware version of the data pump.
• I5—Displays the product code, software version, hardware version, and country code.
• I9—Displays the country code.
Ln
Sets the speaker loudness for fax and data communication.
Available options:
• L0/L1—Low volume.
• L2—Medium volume (the default).
• L3—High volume.