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Thread View: comp.sys.sequent
1 messages
1 total messages Started by Kevin L. Gross Sat, 07 Jul 1990 00:23
Modems & short DTR toggle
#291
Author: Kevin L. Gross
Date: Sat, 07 Jul 1990 00:23
44 lines
2383 bytes
Good Day-

I have a Sequent Symmetry S27 with three telebit T1000 modems for dialins.
They work great most of the time, but it seems that calling these modems
with an MNP class modem causes some kinda difficult reset fiasco.

What happens, apparently, is that the DTR signal from the S27 hardware ports
does not toggle off for a long enough period of time. Sequent's answer was
that their machine was so fast that other hardware talking to the hardware
tty ports couldn't keep up. Welllerrrummmuhhh.... ;-) The S27's toggle is
currently about 20-25 milliseconds.  (I *think* that's what he said)

Telebit was EXTREMELY helpful and busted their arses to help me with
this problem. Unfortunately, they could not come up with any combination
of Enhanced Command Mode switches, of which there are many, that would
"see" the S27's 20-25 millisecond toggle.

It is still possible that Telebit modems SHOULD see that small a toggle,
but they don't and for them to fix it would be a hardware fix, vs. a
software fix by Sequent. Being a software type, I lean that way. ;-)

A DTR toggle OFF/ON of 1 second would probably cause the modem to reset
itself properly.

Anyway, does anybody out there have a solution short of Sequent's
suggestion of submitting a bug to them and waiting until their next
release? Or a solution short of removing the modems and placing them on
some other iron?

Any suggestions for workarounds would be appreciated. Send mail if you
can, otherwise I'll read it here.

Thanks,

-Kevin L. Gross                       klg@Summation.WA.COM
 Network Manager                      Summation Inc.
 Voice (206)823-7998                  11335 NE 122nd Way
 FAX   (206)823-7999                  Kirkland, WA 98034
-- 
-Kevin L. Gross                       klg@Summation.WA.COM
 Systems Manager                      Summation Inc.
 Voice (206)823-7998                  11335 NE 122nd Way
 FAX   (206)823-7999                  Kirkland, WA 98034
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