Specifications

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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: &T n Respond to Remote Digital Loopback Signal
Values: n = 4 or 5
Default: 5
Description: &T4 Enable response to remote digital loopback
signal.
&T5 Disable response to remote digital loopback
signal.
Command: #T n Trellis-Coded Modulation
Values: n = 0 or 1
Default: 1
Description: #T0 Disable trellis-coded modulation.
#T1 Enable trellis-coded modulation.
Command: U n Loopback Test Modes
Values: n = 0, 1, 2, or 3
Default: None
Description: U0 Enable local analog loopback originate mode.
U1 Enable local analog loopback answer mode.
U2 Enable remote digital loopback mode.
U3 Enable local digital loopback mode.
Command: V n Result Codes (Verbose/Terse)
Values: n = 0 or 1
Default: 1
Description: V0 Result codes sent as digits (terse response).
V1 Result codes sent as words (verbose response).
Command: W Wait for New Dial Tone
Values: n/a
Description: Inserted in dialing command, causes modem to
wait for a new dial tone. (X2 or X4 must be
selected.)