I suspect you are right. I just got a couple response at the DTV tech forum indicating I need the DECA adapter. Here's what they wrote...
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The Internet Connection Kit costs $25 + $49 installation (although some folks have reportedly been able to negotiate that down). It consists of a DECA or Broadband Network adapter and power supply to "bridge" your Whole Home DVR network to your home network/internet.
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Whole Home system and hard wire Ethernet connection for VOD will not work correctly together. You will have to call Directv for the internet connection kit to incorporate the internet with the WHDVR system. Thats the only way it will work, there is no secret way around it unless you network your own system together using Cat5 Ethernet cable from each location and connecting them to a internet switch. Using that suggestion will not make your WHDVR system supported by Directv and all trouble shooting will have to be done by yourself.
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