[rescue] Fw: Re: 611 cases & cables

Curious George jorge234q at yahoo.com
Fri Jun 13 19:26:32 CDT 2008

[neglected to CC this to the list... <:-(  ]

[And, my followup follows...]

--- On Fri, 6/13/08, Curious George <jorge234q at yahoo.com> wrote:

> > Consider this:
> > 
> > Crimp your own on 6" segments, cover with real
> > metallic duct tape and  
> > ground.  Cuts down on the ultimate cable length.
> I don';t think I could make cables much shorter than
> those
> little 12" (?) ones.  And, using ribbon cable would
> make
> for a larger bend radius (since the cables have to flex
> left-to-right instead of top-to-bottom).
> But, that brings up another trivial issue...
> The 611 cases (all flavors) have connectors labeled
> "IN"
> and "OUT".  In theory, there should just be a
> "wire"
> connecting IN to OUT inside the case.  However, the fact
> that they have obviously been labeled with an *implied*
> direction suggests there might be buffers inside?
> Or, some magic associated with the auto-terminator?
> Does anyone know if you could connect:
> IN <====> IN - OUT <=====> OUT - IN
> <=====> OUT...
> (i.e., the OUT of two boxes together or the IN of
> two boxes together, etc.)
> If so, you could run a ribbon cable from the OUT of
> box 1 down to the OUT of box 2 (below it); and the IN
> of box 2 to the IN of box 3 (below *that*), etc.
> Hmmmm... I've got a damaged 711 case that I should take
> apart to see how IN and OUT are connected...

The IN and OUT connectors on a 711 are connected together
(though with 2 ft of foil between them to ensure the drives
don't see long stubs).

If the 611's are wired accordingly, IN and OUT are
interchangeable EXCEPT for the last enclosure on the
bus which must have the OUT connector unused (because
the termination is physically located adjacent to
that connector; leaving the IN connector unconnected
instead results in a stub extending beyond the termination)

Just FYI...

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