Low impedence DVI-I A/B Switch



Greetings! I'm looking for a low impedence DVI-I A/B Switch. I've tried
a couple that
the local altex had to offer and no dice, these were a powered KVM
(startech) and a mechanical switch from philmore/vanco. It seems that
the impedence of both switches was too high, around 5 ohms across the
powered switch and 3ohms across the mechanical (a little suprising).
Using really short
DVI-I cable we probably need something less than 2 ohms through the
switch (the system can tolerate the loss equivalent to 10m of standard
DVI cable).

Some background. This is a kinda strange application where
we are using an ADlink PCI-PCI Expansion box to trade PCI slots between
an HP Server and a low power single board PC. The cable and hardware
protocol used for the PCI-PCI expansion is dual link DVI-I (4 pairs of
Tx/Rx). I've looked at both the pinouts for the expansion card and the
DVI-I spec and the data conductors are the same for both, as is the
physical cable spec.The signaling type and data transfer speed is
different (can get this info to you if need be) so I'm wary of more
sophisticated KVM switches with amplifiers/software and such. The idea
is that when the vessel is
unmanned and our system is running on batteries, the operator will
power down the main data acquisition system
running on an power-hog HP Server and with the turn of a switch start
up the low power
computer, select instruments and change the flow of data from the HP to
the low power computer . In a perfect world, this switch would have
some sort of relay and look for contact closure. Even something like a
DVI-I Y might work, as we
can set up the logic so that the server and low power computer are
never powered simultaneously, but an off the shelf DVI-I Y does
not/probably should not exist. Anyways. Let me know if you have any
ideas. It's probably going to turn out that operators are going to have
move a cable during abandonment. Thanks!!


Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question