Re: 5294 controllers on 56k lines

[Neil Palmer <npalmer@xxxxxxxxxxx>]

willy wrote:
> 
> Dear Midrange-L:
> A word of warning to those of you attempting to use IBM 5294 WS
> controllers on 56k digital lines: be prepared to spend a few hundred
> bucks extra for DSU's.  We didn't; and after two nightmarish weeks
> involving not only the phone company and DSU manufacturer techies but
> also two high powered gurus with a protocol analyzer, we figured out the
> problem.  The 5294 controller's interface is prone to intermittent
> fluctuating voltage levels which do not affect slow speed modems but
> cause random, unexpected line degradation and failure in the low-end
> (=cheap, <$350) DSU's recommended by the phone company.  Replacement of
> these DSU's with more flexible (=expensive, >$750) units seems to have
> solved the problem (as spending money often does <g>).  To TELCO's
> credit, they did pay for part of the replacement cost ...


I would imagine that you can purchase a used 5394 for about that same
price.  Less if you consider that you had to get two "expensive" DSUs
and you would only need the one 5394.  Then you could send the 5294 to
the junk yard where it belongs.



-- 
... Neil Palmer                                      AS/400~~~~~      
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