Error Correction And Data Compression Commands - Multitech MT5634HD16 User Manual

MT5634HD8/16 User Guide

Error Correction and Data Compression Commands

You can configure a modem to any of three different V.42 modes of operation (each mode can be with or
without compression). They are the non-error correction, auto-reliable, and reliable modes. You can also
turn data compression on or off.
\Nn Error Correction Modes
n = 0, 1, 2, 3, 4, 5, or 7
Default: \N3
Select the modem's error correction mode using the \N command.
\N0 disables the modem's V.42 error correction capabilities, and the modem functions as a non-error
correction modem, with data buffering. This is the same as &Q6, described earlier in this chapter.
\N1 causes the modem to function in direct mode.
\N2 enables reliable mode, in which the modem uses its V.42 error correction capabilities for all
transmissions. In reliable mode, the modem must be connected to a modem with the V.42 MNP protocol.
\N3 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N5 and \N7.)
\N4 enables reliable mode, in which the modem uses its V.42 error correction capabilities for all
transmissions. In reliable mode, the modem must be connected to a modem with a V.42 protocol (MNP or
LAP-M).
The V.42 standard includes MNP Class 3 and 4 and LAP-M error correction methods.
\N5 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N3 and \N7.)
\N7 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N3 and \N5.)
%Cn Data Compression
n = 0 or 1
Default: %C1
The %C command allows you to disable data compression. Data compression is normally enabled.
%C0 disables V.42bis/MNP 5 data compression.
%C1 enables V.42bis/MNP 5 data compression.
26 CommPlete Communications Server