3Com PC Card User Manual page 35

W: Connection Result Codes
Defines the type of (extended) negotiation result codes to return.
W0 Negotiation codes not reported.
W1 Negotiation codes reported in 3 line format (Hayes format).
W2 Negotiation codes reported in 1 line format (Microcom format).
W3 Negotiation codes reported in 1 line format (Microcom format). The
receive and transmit bit rates will be displayed, Rx/Tx bit rates.
X: Result Code Set/Call Progress
X0 Causes the modem to ignore any network tones and omit the connection
speed message.
X1 As above but enables the connection speed result codes.
X2 Causes the modem to detect dial tone.
X3 Causes the modem to detect busy tone.
X4 Causes the modem to detect busy and dial tones.
X5 Causes the modem to report ringing, to detect busy but dial tone is
ignored.
X6 Causes the modem to perform adaptive dialing (automatically determine
if dialing can be performed using DTMF signaling), to report ringing, to
detect busy and dial tones.
Z: Recall User Configuration
The user configuration stored in non-volatile memory is recalled to become the
active configuration.
Z0 Resets modem and recalls user profile 0.
Z1 Resets modem and recalls user profile 1.
Z2 Resets modem and recalls user profile 2.
Z3 Resets modem and recalls user profile 3.
Note: The actual amount of profiles depends on the size of the non-volatile
memory that a platform contains.
AT Commands 31