I have a customer who is looking to extend the output of a weather station into a second aircraft hangar at an airport. The vendor has approved doing this, but says that any solution we implement must be done "after the monitor." The output is a single VGA port.

They have explained that this means the signal must go from the station to the primary display without any interruption in signal. I am looking for a way to use an ethernet based or even IP based extender in this configuration.

Does a monitor with a video-out passthrough exist? The requirement for uninterrupted signal to the main display leaves out the use of a splitter device, but I am wondering if they will allow a passive Y-Cable. We are checking on that, but I am looking for alternatives if that falls through.

EDIT: The vendor confirmed that a splitter cable is NOT acceptable, so a pass-through monitor would be the only option.

  • Some Monitors have displayPort in and out, not sure about VGA, which appears to be your only option
    – SSumner
    Nov 6, 2015 at 16:15
  • Can you recommend or direct to me to such a monitor? I was unable to find such a beast.
    – Larry M.
    Nov 6, 2015 at 18:19
  • off the top of my head, the p2715q does displayport passthrough, though you trade off half your refresh rate for that. Its 4K tho, and pretty high end. Nov 6, 2015 at 19:15
  • @LarryM, - several of Dell's Ultrasharps can, such as the U2715H
    – SSumner
    Nov 6, 2015 at 20:01
  • What if you point a camera at the primary display?
    – Random832
    Nov 6, 2015 at 20:10

1 Answer 1


Apparently the solution is one of two possible options. There is a DisplayPort standard called Multi-Stream Transport (MST) that was introduced with DisplayPort 1.2 (Wikipedia, n.d.). The other option is a display with a VGA in/out configuration. LG makes a series of monitors that provides this function, the N225WU-BN Cloud monitor, which is designed for use with Microsoft Multipoint Server 2011, but serves the purpose for this application (N225WU-BN, n.d.).

I wanted to thank SSumner for the DisplayPort research direction.


DisplayPort. (n.d.). Retrieved November 6, 2015, from https://en.wikipedia.org/wiki/DisplayPort#Multiple_displays_on_single_DisplayPort_connector

N225WU-BN. (n.d.). Retrieved November 6, 2015, from http://www.lg.com/us/commercial/desktop-virtualization/lg-N225WU-BN

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