post #1 of 1 Thread Starter  We're updating a legacy system that
used Vanco VAN-280502 HDMI Tx/Rx units for videroconference
cameras. (Previously Vaddio or Polycom, now Cisco/Tandberg
Precision HD). The Polycom's had worked, but now as soon as the
HDMI cable is plugged into the PHD, the camera hums. (This
occurs even when the camera isn't powered locally). We swapped
in some Extrons in place of the Vanco's which worked fine. The
questions is--is there a pin-out diagram available for the
Cat5's from Vanco? I'm waiting to hear back from their
engineering dep't for a while now. My gut tells me that this all
has to do with hot plug detect, and possibly a polarity
issue(?). I'm curious as to how Vanco powers the Tx unit
remotely (on what pins), and if HPD is on another pair.