Visitor
•
2 Messages
Upstream Power too Low
I have an Arris SBG7400AC2 that frequently resets. Arris states this is due to the Upstream Power being too low and for Xfinity to increase the signal, but the Xfinity tech was adamant that wasn't the issue or something he would do. At this point I've had 3 phone calls each with Xfinity and Arris and they're just continuously pointing fingers at each other until I just accept whatever the current rep says and hang up.
7400AG2 spec calls for 45-57 dBmV, but the Upstream Power is consistently 38 dBmV. The Tech said that is Xfinity's spec so it is operating correctly, and refused to do anything about it and would not even listen to me when I stated that Arris says their spec is ~50. He kept stating that nobody needs that much, if Xfinity ever delivers that much there's a problem.
Downstream power has been fine, spec is -15 to 15 dBmV and I have been at 6-8.
EG
Expert
•
110.3K Messages
3 years ago
Arris is incorrect! They have been passing the buck and have been conning people with that statement lately !! They are probably trying to cover up for their liabilities about the lawsuits against them because of their use of the horrible Puma 6 chipsets... Only the Comcast plant / engineering specs matter;
Specification Min Max
Downstream Power Level
Cable Modems -10dBmV +10dBmV
Gateways and EMTAs -7dBmV +7dBmV
Downstream Signal to Noise Ratio 35dB -
Upstream Power Level +35dBmV +50dBmV
Upstream Signal to Noise Ratio 31dB -
Upstream Receive Power -2dBmV
+2dBmV
Something else is going on.
https://forums.xfinity.com/t5/Your-Home-Network/Re-Low-Upstream-Power-Level/m-p/3342221/highlight/false#M325246
PS. Plus 57dB would be way too high / out of spec. 35 to 50dB is the desired range.
1
0