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OK, by lowering the receiver buffer size and selecting None for any
handshaking options, my Turbo920 had Zero overflows today on both of the 920
ports. That is good. The bad is that the old tried and true standby of TS4
on the same BMI satellite data feed on another machine received many more
ticks than the ProSuite/GS/BMIDM. Both receive much less than what is
reported at HistoryBank.com each night. PS is on Win98 and TS on W95
machines. So, I am finally coming around to the conclusion that others
have, that BMI data is part of the problem, that the BMI Data Manager is
part of the problem, that the GS may be part of the problem, that the
version of Windows is part of the problem. What puzzels me now is where do
the emini ticks go. If the Turbo920 doesn't report any overflows they have
to be lost in the BMIDM or the GS. For the emini the loss can be as high as
20 to 25% in the GS whereas for other indices the loss is 2% or less. The
higher the tickcount for the symbol the higher the percentage of tickloss.
BR
----- Original Message -----
From: "Jimmy Snowden" <jsnowden@xxxxxxxx>
To: ".Omega List" <omega-list@xxxxxxxxxx>; "BobR" <bobrabcd@xxxxxxxxxxxxx>
Sent: Friday, March 17, 2000 7:40 AM
Subject: RE: DTN Satellite / Serial Card Alternatives
> No overflows here and I have used the 920 for over a year. Global Server
is
> the weak link now. Can't wait to see what happens when DTN gets the T1
line
> configured and data really flows.
>
> Jimmy
>
> -----Original Message-----
> From: BobR [mailto:bobrabcd@xxxxxxxxxxxxx]
> Sent: Wednesday, March 15, 2000 10:08 PM
> To: Omega List
> Subject: Re: DTN Satellite / Serial Card Alternatives
>
>
> Here is something to consider when trying to adapt some of the high speed
> serial port boards to DTN or BMI satellite in hopes of minimizing
tickloss.
> These boards such as the TE920 are designed to accomplish the high speed
by
> use of hardware or software flow control. The BMI satellite receiver does
> not use any flow control and I have been told neither does the 115K DTN
box,
> i.e. it is like a data hose and has no internal buffering. After a week
of
> fooling around with configurations on the TE920 on DTN and BMI on
different
> machines and software, a friend of mine and I are still experiencing
> overflows. That means the buffers(even 64 byte buffers) are not emptied
> fast enough before new data arrives. The 920 is an ISA board and in my
case
> it had gross incompatibility with an internal modem in the adjacent slot
and
> would cause screwy things to happen like windows would freeze and a
constant
> beeping error occurred. There were no conflicts with irq's or dma or
memory
> assignments...chuck the modem...with a nonbuffered port the machine is a
> single function machine. Yes, it will do many things simultaneously, but
at
> the loss of ticks. I just don't think that a 64 or even 128 byte buffer
> will solve this problem. Thus, the requirement for a better datamanager
and
> or a truly buffered board or box as mentioned below. I would like to be
> proved wrong on this point.
> BR
>
>
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