MNP CLASS 5

Modems Glossary

Modems — MNP Class 5

 

 

 

 

 

 

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Information on MNP Class 5

MNP 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%.
     MNP 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).

Other topics in our resources on Modems related to MNP Class 5 include: 
 
  • Microcom Networking Protocols (MNP)
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