Is the Sun serial interface THAT bad?

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#2263

From: Jason L Tibbitts III
Date: Sun, 10 Jan 1993 02:15

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I work with two Suns which are attached to modems: a SparcII hooked to a
Telebit T1600 and an old Sparc VME cage hooked to a T2500.  When I try to,
say, download some files with Zmodem (though spoofed Ymodem has the same
problem) I get bad packets and timeouts like crazy.  On the SparcII every
sixth 1K packet gets mangled, and on the old sparc it's every 13th packet.
Without fail.  If I require that each packet be individually ACKed, things
work and the transfer slows to glacial speeds.  Both machines are unloaded.
This suggests to me that a buffer somewhere is filling and flow control is
breaking down.

Is there any way to get a high speed transfer out of these machines?  If it
helps, at home I have a Worldblazer, but I never have any other problems
with it.

Thanks!

--
 Jason L. Tibbitts III - tibbs@math.uh.edu - 713/743-3466 - 685PGH
System Administrator:  University of Houston Mathematics Department
 Houston Centers for Advanced Scientific and Molecular Computation
Blob Shop Programmers: Database consulting and graphics programming

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From: tibbs@math.uh.edu (Jason L Tibbitts III)
Newsgroups: comp.sys.sun.hardware,comp.dcom.modems
Subject: Is the Sun serial interface THAT bad?
Date: 10 Jan 93 02:15:07
Organization: Blob Shop Programmers
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