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Gold Medal Software - Volume 3 (Gold Medal) (1994).iso
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VFAST
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1994-04-05
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4-5-94 V-Fast Modems
There is no set standard for V-Fast modems and won't be until spring
sometime. Meanwhile Rockwell and others each have come out with their own
'standard' for V-Fast. Rockwell based modems should connect at Vfast speeds
to each other. They connect at V-fast speed on normal voice phonelines. In
fact V-fast is supposed to be better than v32(bis). Use %E1 so your V-fast
modem will fall back if the line conditions warrant when negotiating the
connection. So even between like modems (two Zooms) you may not see 28K
connections. Using a slower speed may actually inrease throughput on 'poor'
lines. Forcing a higher connect speed often causes throughput to be
substantially less than that of the slower connect speed because of errors
and repeated blocks. Between unlike modems the highest connect may be as
low as 14,400 (which is the V32bis ITU standard). There will be some (yet
unknown) charge to upgrade to the ITU v.34 standard.
You can try using the Fx command to force a higher connect, to see if
'line noise' is present. The Init should be the standard AT&F&C1&D2 used
by all Zoom modems. Also try putting %E3 in the init string.
Don Hinds - Zoom Tech
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