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AT Command Set and S-Registers
Table 4-1. AT Command Reference (15 of 18)
AT
Command Description
&U
Disable Trellis Coding
This command selects whether the modem will transmit and
receive modulated 9600 bps carrier with QAM or Trellis
encoding for V.32
Trellis coding (forward error correction) is recommended for all
users. When Trellis coding is not used (disabled), the modem
is able to connect on noisier lines at 9600 bps, however, error
rates will increase without the Trellis coding enabled.
&U0
&U1
&V n
View Active and Stored User Profiles
This command displays a summary of the command and
S-Register information in the Active Profile (currently being
used) and in one of the two stored User Profiles. The
telephone numbers which you saved to memory with the
&Z command are also displayed. The User Profile must have
been already saved to memory using the &W command. See
&W for a list of the command settings which are saved.
&V0
&V1
4-16
Issue 1 November 1994
.
Enabled (Trellis modulation with QAM modulation
as a fallback). This is the recommended setting.
Disabled (QAM modulation only)
Displays summary of Active Profile, User Profile 0,
and Telephone Directory.
Displays summary of Active Profile, User Profile 1, and
Telephone Directory.
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