Re: Weirdo Twinax Address Problem

It's definitely a cabling problem - there's nothing special about port 0.
Most frequent mistake is when twinax over twisted pair is used and one
attempts to chain more than one device.
Two, sometimes three work and when you add more, none of them work.

Best regards
    Alexey Pytel



Jeff Crosby <jlcrosby@fwi.com> on 02/24/99 09:16:08 AM

Please respond to MIDRANGE-L@midrange.com

To:   "Midrange List Server (David Gibbs)" <MIDRANGE-L@midrange.com>
cc:    (bcc: Alexei Pytel/Rochester/IBM)
Subject:  Weirdo Twinax Address Problem





I guess one has never seen it all because I saw a new one yesterday and
today. <g>

I got a new IBM 6400 printer yesterday.  My twinax port 0 cabling looks
like this:

     Console (3180 display) at address 0
     Printer (Anzac 5080) at address 1
     Printer (Anzac 3017) at address 2

The above is also the _physical_ cabling device order.  I set this new
printer to address 3 and tried to physically cable it in between the 2
existing printers on port 0.  All 3 devices were powered off during
these attempts.

It wouldn't work.  When I would power the console back on, there was no
display.  Doing a WRKCFGSTS at another display showed the console as
SIGNON DISPLAY, but the console screen was blank.  I didn't even try the
2 existing printers.  No print device was autoconfigured for the new
printer.  It was as if the twinax card in the new printer was DOA or
something.

This morning I tried something different.  I had an open port (port 7)
on the AS/400 with no devices on it.  I ran a cable from this port on
the AS/400 to the new printer and powered it on.  The AS/400
autoconfigured it just as I expected, device type 4234 address 3.  I
have not tried recabling it into the port 0 string where I really want
it.

Has anyone seen this?  Is there some restriction on port 0 (other than
address 0 for the console) that I evidently don't know about?  Is this
new printer so new that it won't coexist on the same port with that
ancient 3180 and Anzac printers? <g>  Will the AS/400 not autoconfigure
on port 0?

Thanks for any help.

--
-Jeff

jlcrosby@fwi.com
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