The source device, be it a tuner, vcr, DVD player, or PC graphics card, is meant to operate into a 75 ohm load at the display; you either have 75 ohms in the display, or perhaps it is switchable from hi-z to 75 ohms, or there is a looping connector that needs a load plug installed. The loop modules
for ECP projectors are an example of the last type. When you do loop thru several displays, all should be hi-z except 75 ohms on the last in the series.
From what I've read about termination (using the search function) the IFB11 has a selectable termination. My 1271 is equiped with a IFB10 for some reason though so there's no switch and I think I need to terminate the cables myself.
I believe the IFB10 has its own terminator, the 1271/72 manual says that the RGB inputs are terminated with 75Ohm. The HV inputs are high-imp, so you may want to terminate these, but this is not really nesesary
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