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Forum Discussion
Mid/High-Split modems affecting TV Cable Pixels Reception?
This past year, I was using the Xfinity XB8 modem which utilized the newer enhanced Xfinity Mid/High-Split spectrum (32x8) allocation in DOCSIS. As advertised saw my upload speed go to over 120 Mbps...
K, Something the ISP will need to send a on site tech to have a look into then. Possible this coax splitter maybe causing problems as well. They are known to induce some interferences or cut the power level down maybe too much, depending on how good the splitter was built. Have a tech check things up to this splitter then into the home.
Something to try as well for a quick test, remove the splitter. Then connect up the STBs directly to the main ISP cable coax line. Test the TV STB out. See if there is any differences. Internet will be down during this quick test so find time when nobody needs the internet if you do this. Put the splitter back after testing.
Make sure power levels for the CM modem are with in these guide lines:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Thanks for the info, appreciate your comments. I did try reducing all the split lines and just having one split going to the cable modem and one split directly to a TV. Had the same pixelation result. Also noted that have had no issues for 20+ years, until I installed a 32x8 cable modem on the network.
Would try the non split line up to the TV STB to check that.
Hopefully the on site tech will find the problem.
You can post the CM modem connections and event logs data pages here if you'd like us to check them out for you:
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-routerAs you have shown, not all of the Xfinity set top boxes (STB) or satellites play nice with the upstream OFDMA signals being transmitted from the mid-split modems.
Determine the model number of your STB and check with an Xfinity store to see if a newer version is available that is less susceptible to interference from the mid-split modems. You could also have a faulty STB.
Kitsap, that is a good idea. Wish the cable provider would be more upfront as to which setup boxes can cause this problem. I have had great difficulty getting and understanding to this issue, and any acknowledgement from the ISP that the issue exists.
