Insys Modem 56k 4.1 11-02-01-01-40.028 Manuale Utente

INSYS Modem 336/56k 4.1 (UL) 

Functions 

 

 

Switch on V.42bis data compression. 
 
Switch off V.42bis data compression 
 

 

V.42bis data compression may only be performed for a V.42 
connection (LAP-M or MNP 4). First of all, V.42bis generates a 
so-called dictionary for the data compression, which contains 
frequently used character sequences. After that, only short 
references to these character sequences and not the complete 
character sequences are transmitted to the other modem. 
V.42bis cannot re-pack packed data. 

The modem masters the Microcom Networking Protocol Level 
5. MNP 5 data compression can only be performed for an er-
ror corrected MNP 4 connection. MNP 5 replaces frequently 
used characters by shorter characters, so-called tokens. 
MNP 5 cannot re-pack packed data. 

The V44 data compression offers better compression of typi-
cal internet content than V.42bis. V.44 also requires an error 
corrected connected, just as V.42bis, and cannot re-compress 
already compressed data. 
 
Switch off V.44 data compression: 
 
Switch on V.44 data compression: 

July 06 

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