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1990-08-06
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39 lines
Number: F2TH072590U200
Subject: Asynch Bridges in 386 Fast Machines
Date: August 2, 1990
OS Version: 2.1x
Revision: 2.12, 2.15C
Shell Version: N/A
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GENERAL
INFORMATION: This problem arose on NetWare v2.15 Rev C, but we reproduced
it and made the fix on v2.12.
PROBLEM: Using a v2.15C bridge with WNIM card and Hayes modem, the
bridge initialized LAN A (in this case an NE1000), but hung
after the "Initializing LAN B" message. The EGA screen
blanked after a couple of minutes. A scope on the line
showed the ATZ message being correctly sent to the modem
(a Hayes 2400), and the OK response being sent back.
The weird thing was that a Hayes Quad modem, configured as
a 2400, worked fine some of the time.
SOLUTION: The machines being used by the customer were various Compaq
and other quality 386 machines; ours machines were AST 386s.
When we slowed down the machine to "slow as a snail" mode,
it all worked.
When we used a COM port, we saw about an 80% success rate.
We didn't test slowing down the machine with a COM port.
COMMENTS: The bridge waits for the OK response from the modem after
resetting it with the ATZ command. On a fast machine, we
suspect that the bridge times out before the Hayes 2400
sends the OK response. A faster modem (in terms of command
response) beats the timeout.
(X) This information was verified in the lab.