//Hi Igor, //

Once on *09.07.03* you wrote about "OFFICIAL NOTICE!!!" to Olga Zhegulo

 OZ>> Modems transfer zip compressed data so data rates over about 38400 kbaud
 OZ>> = 4800 cps are impossible.

 IK>  Only zip archives ? ;-)) 

MNP5 uses some kind of zip compression before transfer any data.

 IK> transferring the uncompressed data (plain text etc.) 

I've read specifications of V42. It transfer only compressed data. You mean
V90 doesn't compresse data?

 IK> at high speeds using
 IK> V90 it's easy to achieve very high CPS (theoretically, 56000 bits per
 IK> second = 7000 bytes per second;

It's a theoretical high limit of a digital line. Usual speed can't be more
than 90% of it.

 IK> using V42bis at uncompressed data -
 IK> apporx. 14000 CPS). 

Character is 8 byte. 14000*8=112000 - limit of usual ;-) COM port

 OZ>> Surely data rate is less then
 OZ>> connection rate depending upon a line quality.

 IK> Why?

Because technical information is transferred (e.g. packet headers). And if
some packets are lost they're need to be resend.

Bye.
O.Z. oz{at}newmail.ru


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