User's Manual

%E – Auto-Retrain Control
This command controls whether the modem automatically initiates a modem
retrain whenever the received data signal quality falls below a threshold that
may affect data reliability. The value for ’n’ is stored in the NVRAM.
AT%E0 Disabled
AT%E1 Enabled (factory setting)
%G — Rate Renegotiations
This command selects whether the modem automatically initiates a change to
higher speed or lower speed depending on received signal quality (that is, rate
negotiation). The modem always responds to any rate change initiated by the
remote modem.
AT%G0 Disabled
AT%G1 Enabled (factory setting)
"H — V.42 bis Compression Control
This command specifies whether the data in the LAPM frames are
compressed using V.42 bis data compression. This can improve throughput by
as much as 400%. Compression can be negotiated to operate in one direction
or both.
AT"H0 Disables V.42 bis
AT"H1 Enables V.42 bis only when transmitting data
AT"H2 Enables V.42 bis only when receiving data
AT"H3 Enables V.42 bis for both transmitting and receiving data
(factory setting)
"O — V.42 bis String Length
This command specifies the maximum number of characters that can be
compressed into one V.42 bis code word. The default value of 32 optimizes
throughput for most file types. (6-250 = Number of characters); (n=32; usual
number of characters).
2-20 AT COMMANDS: DATA MODEM