4 AT Commands, S-Registers, and Result Codes
31
Command: &Y
n
Select Profile for Hard Reset
Values: n = 0 or 1
Default: None
Description: &Y0 Select profile 0 to be loaded on power-up.
&Y1 Select profile 1 to be loaded on power-up.
Note: See also the &W and Z commands.
Command: &Z
y=x
Store Telephone Number
Values: n = 0, 1, 2, 3
x = Dialing command
Default: None
Description: Stores telephone dial string x in memory location y. Each
telephone number dial string can contain up to 30 digits. Dial
the stored number using the DS=y command.
Note: DTR dialing uses the number stored in memory location 0.
Command: %C
n
Data Compression Control
Values: n = 0, 1, 2, or 3
Default: 3
Description: Enables or disables data compression negotiation. The modem
can only perform data compression on an error-corrected link.
%C0 Disables data compression.
%C1 Enables MNP 5 data compression negotiation.
%C2 Enables V.42bis data compression negotiation.
%C3 Enables both V.42bis and MNP 5 data compression negotiation.
Command: %E
n
Line Quality Monitor
Values: n = 0, 1, or 2
Default: 2
Description: Controls whether or not the modem will automatically
monitor the line quality and request a retrain (%E1) or fall
back to a lower speed when line quality is insufficient and fall
forward to a faster speed when line quality is sufficient (%E2).
%E0 Disable line quality monitor and auto-retrain.
%E1 Enable line quality monitor and auto-retrain.
%E2 Enable line quality monitor and fallback/fall forward.
Command: %L Line Signal Level
Values: None
Default: None
Description: %L Returns a value that indicates the received signal level in dBm.
The value returned is a direct indication (DAA-dependent) of
the receive level at the MDP, not at the telephone line connector.
Examples: 009 = -9 dBm, 043 = -43 dBm, and so on.
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