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Hello --   I keep getting "No Ranging Response received - T3 time-out" errors on my Arris SB6190. I've placed a brand new SB6190, as well as an older Motorola SB6141, and all have had the same issue. (Both Arris SB6190's were brand new out of the box). I'm using commercial grade Ubiquiti networking equipment, and have eliminated them as the problem, as the problem happens when DCHP directly to the modem. This issue has been happening consistently since I first moved in to my home (Feb 2018).   My downstream signal levels are good. SNR downstream is also good.   Upstream has always been an issue. I was observing peaks where the CMTS would crank my modems upstream output level beyond 52 (thus out of spec) and the modem would timeout.    This prompted me to remove all splitters between my modem and the Comcast Tap. The RG-6 cable going to the tap is directly connected to the grounding block from Comcast -- so it's directly connected to the proverbial 'pipe'. The ends are terminated with the best compression fittings in the industry and brand new.   Whenever the line comes under load (E.g. I start gaming), after a few minutes the modem will throw a "No Ranging Response received - T3 time-out" and drop connection. Looking at my logs, I always observe one or more of the upstream power-levels spiked higher than normal, telling me the CMTS at the other side of the pipe cranked my levels for some reason (presumably bad SNR in the up-stream connection).   Below is my signal readout (down levels are high because I'm directly connected to the 'Pipe' as stated previously.)     Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables 1 Locked 256QAM 27 627.00 MHz 4.20 dBmV 40.37 dB 5 45 2 Locked 256QAM 34 441.00 MHz 6.40 dBmV 40.37 dB 0 0 3 Locked 256QAM 35 447.00 MHz 6.10 dBmV 40.37 dB 0 0 4 Locked 256QAM 36 453.00 MHz 6.40 dBmV 40.37 dB 0 0 5 Locked 256QAM 37 459.00 MHz 6.40 dBmV 40.37 dB 0 0 6 Locked 256QAM 1 465.00 MHz 6.30 dBmV 40.37 dB 0 0 7 Locked 256QAM 2 471.00 MHz 6.10 dBmV 40.37 dB 0 0 8 Locked 256QAM 3 477.00 MHz 6.20 dBmV 40.37 dB 0 0 9 Locked 256QAM 4 483.00 MHz 6.50 dBmV 40.37 dB 0 0 10 Locked 256QAM 5 489.00 MHz 6.50 dBmV 40.37 dB 0 0 11 Locked 256QAM 6 495.00 MHz 6.50 dBmV 40.37 dB 0 0 12 Locked 256QAM 7 507.00 MHz 6.30 dBmV 40.37 dB 7 0 13 Locked 256QAM 8 513.00 MHz 5.90 dBmV 40.37 dB 0 0 14 Locked 256QAM 9 519.00 MHz 5.90 dBmV 40.37 dB 16 0 15 Locked 256QAM 10 525.00 MHz 6.00 dBmV 40.37 dB 0 0 16 Locked 256QAM 11 531.00 MHz 5.70 dBmV 38.98 dB 0 0 17 Locked 256QAM 12 537.00 MHz 5.60 dBmV 38.98 dB 0 0 18 Locked 256QAM 13 543.00 MHz 5.60 dBmV 40.37 dB 3 0 19 Locked 256QAM 14 549.00 MHz 5.70 dBmV 38.98 dB 0 0 20 Locked 256QAM 15 555.00 MHz 5.90 dBmV 38.98 dB 0 0 21 Locked 256QAM 16 561.00 MHz 6.30 dBmV 38.98 dB 0 0 22 Locked 256QAM 17 567.00 MHz 6.50 dBmV 40.37 dB 5 0 23 Locked 256QAM 18 573.00 MHz 6.90 dBmV 40.37 dB 11 0 24 Locked 256QAM 19 579.00 MHz 7.10 dBmV 40.95 dB 10 0 25 Locked 256QAM 20 585.00 MHz 7.00 dBmV 39.90 dB 10 0 26 Locked 256QAM 21 591.00 MHz 6.70 dBmV 39.90 dB 0 0 27 Locked 256QAM 22 597.00 MHz 6.10 dBmV 39.90 dB 0 0 28 Locked 256QAM 23 603.00 MHz 5.30 dBmV 39.50 dB 0 0 29 Locked 256QAM 24 609.00 MHz 4.90 dBmV 39.50 dB 0 0 30 Locked 256QAM 25 615.00 MHz 4.60 dBmV 38.90 dB 7 0 31 Locked 256QAM 26 621.00 MHz 4.10 dBmV 39.20 dB 0 0 32 Locked 256QAM 28 633.00 MHz 4.20 dBmV 39.20 dB 0 0 Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 4 5120 kSym/s 16.60 MHz 35.50 dBmV 2 Locked ATDMA 3 5120 kSym/s 23.00 MHz 35.00 dBmV 3 Locked ATDMA 2 5120 kSym/s 29.40 MHz 35.50 dBmV 4 Locked ATDMA 1 5120 kSym/s 35.80 MHz 35.25 dBmV     How do I get the upstream line-levels and SNR inspected at the plant? An in-home tech cannot do that. ... View more