The HomePlug adapter is used give your power lines the ability to carry Ethernet signals. Normally you need 2; one on each end, but since the VIP receivers have a built-in HomePlug, all you need is the one by the router.
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A 722 runs 2 TVs, but only the TV1 output is in HD; the TV2 output is fed with coax and down-converted to SD. The 722 has 2 satellite tuners and 1 OTA tuner (requires you to have an OTA antenna). It's configuration means that a few things are different from DirecTV.
On one hand, you will have 2 TVs that can share the "library" of recordings on the DVR. That can be nice if you, say, want to move from the living room to the bedroom to finish watching a movie.
On the other hand, if both TVs are each using a sat tuner, either to watch something live or to record, then there are no "extra" tuners to watch something else. Example: you're recording a show on TV1 and someone is in the bedroom watching something else live on TV2, and you decide you want to watch something else on TV1. Your options are:
- watch what you are recording
- watch what the TV2 person is watching live
- watch something already recorded on the hard drive
What you cannot do is watch a 3rd show "live". If you're used to doing this, which many people do since DirecTV DVRs dedicate 2 tuners per TV, then you'll need to adjust a bit. If you mostly watch pre-recorded things off the DVR, then you may never even notice.
Also, if you have an OTA antenna, you can view the OTA feed live, or record it, on TV1. TV2 cannot see the OTA feed live; it is limited to watching OTA recordings off the DVR.