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Personally I wouldn't worry about it too much. Your power levels look consistent on the non-OFDM channels and that's where the bulk of your data will be passing. I've got the MB8600 and it's been rock solid for the most part other than needing a reboot on 1/1 for some reason IP traffic dropped. I haven't seen much issue with pings dropping either and got IPv6 enabled on the router the other day and traceroute's are mostly in v6 now and the hops are performing quite well for response times.
If you're having issues though a direct Ethernet connection rules out any interference from the router. I found an issue with my previous router even branded as AC / gig ports for the LAN it bottlenecked things to 250M but a direct connect yielded 950 x 45 on speedtests. With some other equipment I was having issues with ping spikes from 10-20ms to 800+ ms and finally figured out it was the WIFI on the modem when I hooked up the router and put it in bridge mode it went away. So, sometimes it just takes a few tries to get things optimised.
Personally I wouldn't worry about it too much. Your power levels look consistent on the non-OFDM channels and that's where the bulk of your data will be passing.
Just an FYI this is not true and it really depends on the gear.. But basicly the bulk of the traffic will run on the OFDM channel in most cases..
I am a new comcast customer and don’t know what to really expect with DOCSIS 3.1 and power levels. I’m running an SB8200 with Gigabit tire speed.
I am going send you a PM I will need the CM-MAC to take a look at the modem and the CMTS side of things..
Your looking better right now then you did before.. Are you seeing the same on your side?