Gerhard,
At one installation (20+ years ago) we had over 1500 local 3270's
scattered over a 18 story building with wiring so difficult it took
a master electrician to find some issues. We also bumped into the #
of UCB's issue as well.
AT first we had all IBM then started to get raytheon. Once IBM came
out with the 1A's(?) (local sna) we went back to all IBM. I am trying
to remember (with no success) if the raytheon needed more that one
cable going into their control but I am not coming up with a yes or
no answer.
We were desperate for UCB's and even looked at the 8100's but it was
a nightmare (programming and maintenance (software long story and I
will explain offline if requested)).
Ed
On Feb 18, 2013, at 7:23 PM, Gerhard Postpischil wrote:
On 2/18/2013 1:14 PM, Anne & Lynn Wheeler wrote:
part of the 3270 terminal & terminal emulation ecology was the
long runs
of coax cables from the datacenter all over the building to each 3270
... for some large buildings the weight of the coax cables were
approaching building safe loading limits. a lot of the effort that
went
into token-ring by the communication group was to use token-ring to
replace coax cables (significantly reducing the weight) for terminal
emulation.
We kept the IBM units on one floor, mostly for operators,
programmers, and customer support. For data entry, we used ITT
controllers and terminals; they had the advantage that the boards
could be removed from the controller and placed in what was
essentially a power supply. This reduced needed cables by a factor
of 8. We also tried AT&T unit with flat cables, but those kept
failing due to interference.
Gerhard Postpischil
Bradford, Vermont
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