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Good idea to check around for feedback on this. Here is some. A friend and
I are both running the TurboExpress 920 which has the 64 byte
buffers(16750uarts). PacificComware has no plans for a 128byte board. He
is running DTN and Ensign and I am running ProSuite - Global Server - BMI
data manager and BMI satellite. DTN has a much higher baud rate than the
BMI sat box. We both get character overruns even though BMI is 38.4K and
his DTN is magnitudes faster. Someone posted a theoretical requirement for
buffer size a few weeks back and I believe the conclusion was that even a 64
byte buffer would be insufficient. I don't recall if a 128 would be. We
also made tick counts at the end of the day for the same symbol and time
period. I also compared the tick count on a TS4 system using the
motherboard comport and an SIIG CyberSerial Dual 16550uart board(16byte
buffer). We used the emini because of the large number of ticks in a day.
Conclusion supports the notion that the ProSuite-Global server - BMI DM
combination is a tick loser. It appears to lose up to 20% or more of the
emini ticks whether it is on a motherboard comport(16 byte buffer) or an ISA
board comport(64 byte buffer). Whereas on the big snp it loses about 2%
compared to the TS4 system. The DTN Ensign system always came in with a
thousand more emini ticks than the TS4(comport or SIIG PCI board both of
which were 16byte buffers).
Just a few days ago I discovered that Black Box has a PCI board with the 128
byte buffer(16950 uart). Belief here is that no configuration is going to
help the BMI Data Manager as that is the bottleneck.
BobR
----- Original Message -----
From: <ALVIS2JS@xxxxxxx>
To: <omega-list@xxxxxxxxxx>
Sent: Tuesday, March 14, 2000 10:31 AM
Subject: DTN Satellite / Serial Card Alternatives
> Moving from TS4 / W98 / BMI sat to TS2k,V5 / Windows 2000 / DTN sat.
>
> Am considering Pacific CommWare TurboExpress 920. But DTN rep also
mentioned
> alternative serial cards from Boca, Siig and particularly Digi
International.
> Digi (www.digi.com), which apparently has a 60% market share, claims
their
> twin port Acceleport Xr, is a superior product that minimizes use of
system
> resources. At $200 to $250 (street price), it is somewhat more expensive.
>
> Does anyone have knowledge of or experience with these alternatives to the
> 920, particularly the Digi Xr. Any thoughts appreciated.
>
> Regards,
> Jim Alvis
>
>
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