Microcom Networking Protocols Class 5
Modems Glossary
Modems — Microcom Networking Protocols Class 5
Information on Microcom Networking Protocols Class 5
Microcom Networking Protocols Class 5·is one of the error correction
and data compression protocols developed by the modem manufacturer Microcom.
MNP
Class 5 provide a data compression protocol that
can increase throughput by up to 200%.
Microcom Networking Protocols Class 5 yields data compression rations of between 1.3:1 and 2:1
using two data compression algorithms:
- Huffman encoding is used to re-encode ASCII characters. Frequently used characters such as a, e, and s are encoded using only 4 bits, whereas rarely occurring characters such as x or z are encoded using as many as 11 bits. Overall, the effect of Huffman encoding is that more characters are transmitted using fewer bits.
- Run-length encoding examines a data stream in search of repeating characters. When a character repeats more than three times, the algorithm replaces the entire string of repeated characters with only three repetitions of the character followed by a count field indicating how many times the character is actually repeated. For example, 10 repeated characters would be sent as 4 characters (3 characters + 1-byte count).
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