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Modem Speed Question

Posted on 1997-06-03
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Last Modified: 2010-04-12
Hi,
  This is going to sounnd strange, but I want to know ow fast my modem is.  The manual calls it  a V.34 Modemt. It also says that it is  based on the Rockwell chip set.  The manual also says that it supports speeds of up to 115.2Kbps, but how is that possible?
  So my question is - how fast is it?
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Question by:Begemot
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val_m earned 50 total points
ID: 1009279
Your modem is 28.8Kbps. (That's kilobits not kilobytes).  When manual says that your modem supports speed up to 115.2 Kb they mean with compression and is the maximum speed your com port will support.  Rarely if ever you will achieve 115.2 Kb speed.  Here is the reference for some modulation standards:

V.21                 300bps
V.22                 1200bps
V.22bis             2400bps
v.23                  1200bps/75bps     (1200 upstream, 75 downstream)
v.29                  9600bps
v.32                  9600bps
v.32bis              14.4Kbps
v.32fast             28.8Kbps         (V.FC / superseded by v.34)
v.34                   28.8Kbps        (Current standard)
v.34+                 33.6Kbps        

There is no standard for 56Kbps speed as of yet.

v.42 & v.42bis are error correction and compression protocols and are not related to the speed of modem        (although they are related since the compression can push more data through the phone line, but is invisible when downloading most files which are already compressed)

vmushinskiy@earthlink.net
V.34+ is 33.6
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