RE: Serial Port busy.

["Carl P. Soffronoff" <Carl.Soffronoff@Eng>]

Hmmm...I wonder if this is why the modem pools are limited to
28.4KB...

| Date: Fri, 19 Mar 1999 15:46:44 -0500 (EST)
| From: Christian Rudolph - WorkGroup Layered Software 
<Christian.Rudolph@xxxxxxxxxxxx>
| Subject: RE: Serial Port busy.
| To: pilotmgr@xxxxxxxxxxxxxxxxxxxxxxx, bmedirat@xxxxxxxxxxxxxx
| 
| I have an Ultra1, and I have found the same situation.
| I am unable to get any reliable results with a port
| speed faster than 38400.  I have talked to engineers
| here in the Systems QA lab who test this, and they
| pretty much agree with what Bharat says.  Basically,
| Sun has not really made any effort to make sure that
| high port speed rates can be achieved higher than
| 38400. This is what I am told.  I don't know whether
| this is true or not, but it explains things.
| 
| -Chris
| 
|  :From: "Bharat Mediratta" <bmedirat@xxxxxxxxxxxxxx>
|  :To: pilotmgr@xxxxxxxxxxxxxxxxxxxxxxx
|  :Subject: RE: Serial Port busy.
|  :
|  :Once upon a time, a kindly hardware engineer explained this
|  :to me.  Because of the clock rates, what Sun boxes (up to an
|  :Ultra 2 at the time -- I don't know if it applies to boxes
|  :later than that) represent as 57600 is actually something in
|  :the ~52000 range.  This is because of a difference in clock
|  :rates.  Feel free to correct me if I'm wrong here.  So two
|  :Suns can talk to each other at "57600" and above, but you
|  :can't talk to another component that is actually talking at
|  :57600.  The best rate I was ever able to use was 38400.
|  :
|  :-Bharat
| 
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