4-12-94
                     Data transfer =S=P=E=E=D w/v42bis

     If you connect with v42bis and get transfers in the range shown below,
you  are doing fine, and probably transferring Compressed files  (Zip,  LZH
etc)  or Graphics (all of which v42bis cannot compress further). If you  do
well over the cps shown below then you are getting compression. The  amount
of  compression depends on the type of file. Some (spreadsheets,  database)
compress a lot, some very little (exe, com) and some in the middle (text).

a 2400 w/v42bis is 290-320cps
a 9600 w/v42bis is 11-12,000cps
a 14,400 w/v42bis is 15-17,000cps
a 24K  w/v42bis is 26-27,000cps
a 28K  w/v42bis is 32,000cps +/-

     If the transfer seems slow, you can see your 'true' connect speed when
you  make  the  call by putting S95=1 in your init string.  Then  when  you
connect  it  will  give the carrier speed, instead  of  the  computer-modem
speed  in the CONNECT statement. (be sure Autobaud=OFF). The  higher  speed
modems  by  default  will fall back to lower connect  speeds  if  the  line
quality is poor.

     The  best transfer protocol is usually Zmodem. Then Ymodem  (sometimes
listed as Xmodem-1K) or Ymodem-Batch. Xmodem or Kermit can be VERY slow.  I
also  suggest  try using the 'next-higher' speed  modem-computer  than  the
modem-modem  supports.  IE:  14,400 to 19,200(or 38,400),  28K  to  38,400.
Setting 57,600 or higher sometimes actually is slower than 38,400.

                                   Don Hinds - Zoom Tech
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