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BOCA PRO16 Reference Guide
ERROR CORRECTION
Error Correction Protocols
This section examines the error correction and data compression
features of your modem. The modem offers both V.42 (LAP-M) and
MNP
®
(Microcom Networking Protocol™) error correction protocols.
These protocols allow data errors to be detected by the receiving
modem, provide flow control between remote systems and improve
the overall throughput of data transfers.
Your modem also supports V.42bis and MNP5 data compression.
V.42bis is a high performance data compression enabling you to speed
up, theoretically by four times, data throughput on some types of data.
MNP5 allows you to speed up data throughput by up to two times on
some types of data.
Two types of error correction protocols are offered by your modem;
V.42 (or LAP-M) and MNP.
FError correction protocols are not available when a V.23 connection
is established.
V.42 is an international standard for error correction between modems.
V.42 ensures any errors introduced into your data by telephone line
noise is automatically corrected before it is received by your computer.
Because V.42 is a CCITT standard, it has become very popular in
modems all over the world. V.42 also supports a fallback mode to
MNP, in order to remain compatible with modems introduced prior to
V.42.
Before V.42 existed, MNP was the de-facto standard for modem error
correction. MNP classes 2-4 are supported by your modem for error-
correction (an additional class of MNP is supported for data compres-
sion). Because MNP is a far less complex error correction protocol than
V.42, it outperforms V.42. The section titled “Which Error Correction
Do I Use?” provides more information about the performance and
compatibility merits of V.42 and MNP.
The \N command is used to select the type of error correction used by
your modem.
Error Correction
Error
Correction
pro16ref.pm6 6/14/96, 2:36 PM27
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