User`s manual

U.S. Robotics I-modem Command Reference
Appendix A: Alphabetic Command Summary • Page A-18
&K3 Selective data compression. The I-modem negotiates only for V.42bis com-
pression, and disables MNP Level 5 (MNP5) compression. Use this setting
to transfer 8-bit binary Þles, .ZIP Þles, and other Þles that are already com-
pressed.
&Ln Line type.
&L0 Normal.
&Mn Enable ARQ (error control) or synchronous
protocols. Both your I-modem and the
remote device must use the same protocol
.
&M0 Normal mode, no error control. Due to the nature of phone line channels,
this is never recommended for calls above 2400 bps.
&M1 Use for online synchronous mode without V.25bis. This setting is exclusive
of the I-modems' error control.
&M4 Normal/ARQ mode. If an ARQ connection isn't made, the modem operates
in Normal mode as though it were set to &M0.