There are a couple posts on this site which helped me immensely in de-bugging my Mediacom modem with a TiVo MoCA connection. However, the main one-year old post ended without results being posted so here are my results.
I did not get the TiVo from Mediacom but purchased it from Best Buy, hence, I had to set it up myself. I used a splitter on the Mediacom coax into the house to send one signal to the modem and the other to the Actiontec ECB2500C MoCA adapter. This resulted in my Internet speed dropping from 27Mbps to less than 2.5Mbps. Clearly the MoCA signal was overwhelming the modem.
My solution was to connect the modem to the 'STB Out' connector on the Actiontec. That connector does not pass MoCA frequencies and the modem jumped right back up to 27Mbps. In other posts people have said Actiontec does not recommend this approach. WHY? Perhaps they feel you should stick a MoCA POE filter on the coax into the modem instead. But I live in a city of 3.5 million and no one carries the MoCA POE filter - I have to order from Amazon, eBay or TiVo. So why not use what is already on hand?
Since my internet was still working I did not notice immediately that the speed had been cut. It primarily affected video clips. When I called Mediacom they did not diagnose this - they offered to send a tech out after detecting a 'bad signal/condition' on the modem. Perhaps, since it was not their TiVo, they did not think to check that aspect. They also do not sell MoCA filters to the public - only their techs get them in a kit.
A couple of asides about setting up TiVo yourself: the 'Cable Card' that Mediacom rents is a breeze to install in the TiVo unit and works well. (This is the card that decodes/enables high def channels). Secondly, when you want to setup a mini always be sure to register the mini on the TiVo site, wait 15 mins, then re-sync your main DVR unit with TiVo, else the DVR will not recognize the new mini.
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