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is there a keyboard shortcut to switch between computers. For example on the black box serve switch you can hit ctrl, ctrl, 1 to go to the computer on port 1
According to the manual, the only way to switch servers is by pressing the appropriate key on the unit\'s front panel.
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can you stack this unit to support dual monitors?
Unfortunately no, this unit cannot stack for dual monitor support.
For dual DVI monitor support you can try these:

Avocent:
https://www.kvm-switches-online.com/2svdvi20bnd1.html
Adder:
https://www.kvm-switches-online.com/av4pro-dvi-dual-us.html
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CAN THE USB FOR KEYBOARD AND MOUSE BE EXTENDED WITH A CAT5 EXTENDER
The short answer is no, not really. The long answer is technically yes, you could extend to local port, but these secure switches do not offer hotkey switching. You have to hit the button on the KVM to switch computers. So, if you wanted to extend the local monitor, keyboard, and mouse, you would have to walk back over to the switch to change targets.

Unfortunately, this particular switch is discontinued. The direct replacement is the Avocent SC640-001.
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What is the MTBF for SC4UAD-001?
Thank you for your inquiry. The MTBF rating for this KVM are reported to be:
at 25 degrees C - 131,116 hrs or 15.0 years.
at 40 degrees C - 47,776 hrs or 5.5 years.
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Avocent SC4UAD-001 has two solid green lights and no power light.
Thank you for your inquiry. Due to the varied nature of user environments, detailed product support is beyond the scope of this simple FAQ. We recommend trying the Avocent support community for help with your SC4UAD. http://community.emerson.com/networkpower/support/avocent/.

In addition to the main support community, there is a specific group geared just to the SwitchView series: http://community.emerson.com/networkpower/support/avocent/desktop/switchview/.
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