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On Smart-AVI's website, this description is shown as - Supports resolutions up to 3840x2160 (@30Hz), not @60Hz as you show it.
Thank you for your inquiry. We are updating our webpage to reflect the newly available refresh rate information.
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Does the display port 1.2 compliance include multistreaming to chain an additional monitor off the first display port connection?
Thank you for your inquiry,

Multistreaming (MST) is is not supported on the DPN-4PDUO, but may work on certain monitors. The DisplayPort signal is processed along the way so most of the time the datalanes do not have a transparent 1-1 connection. Unfortunately we are unable to recommend a solution with MST as this is not a feature that our vendors support; We would generally recommend avoiding cascading DisplayPort monitors when connected to a KVM - you can achieve multi screen setups over individual video connections.
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What is the guarantee period ?
Thank you for your inquiry. All new Smart-AVI products come with a standard 1 year warranty for defects in materials and workmanship.
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If this device is for four PC connections, why are there 8 different input ports?
Thank you for your inquiry,

SmartAVI DPN-4Duo is designed for switching 4 Dual-monitor PCs - this KVM unit takes in two video inputs as well as 1 USB input from each PC source. For an illustration of this, please see image below:

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For a 4-port single-monitor version of this switch, please see the SmartAVI DPN-4P.
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How would I connect source computers since the cable recommended for this device (CCDPMMKVM-06-S) only has a single (not dual) Dport connection per cable? Please advise?
Thank you for your inquiry,

This DPN-4Duo KVM would require (1) CCDPMMKVM-06-S + (1) DisplayPort cable (i.e. C2G 54401) per source computer - so a total of 4 of each cable for 4 dual monitor sources.

Please let us know if there is anything else we can help you with!
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