pls@sortac.UUCP (P.L.Sullivan) (12/04/85)
HELP!!
We are planning an application for an AT&T 91B1 Control Unit
and have not yet been able to locate anyone who has any
experience with these beasts. They supposedly convert a
1400 bps protocol coming from an ESS switch to an RS232
asynchronous protocol acceptable to our 3Bx ports.
We think that we can understand the contents of the data stream
once we have shaken the 91B1's hand, but we can't get it to
acknowledge our presence. (When we raise DTR, its "computer"
LED stops flashing, but starts again 30 seconds later no matter
what we say to it. We have tried what we think to be all 3
91B1 maintenance messages - "Keep-alive", "Send a reply", and
"Reply to R=2" - with and without bytes swapped, etc. all to no
avail. Datascope indicates what we sent arrived well within the
30 second timeout interval, but the 91B1 never replies and always
times out).
We would greatly appreciate any comments, advice, etc. from
anyone who has had any experience whatsoever with these.
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Pat Sullivan - {akgua|akguc|ihnp4}!sortac!pls - voice 404-257-7382