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Forum Discussion
cm600 xfinity T3 error then bufferbloat
Hi,
i have blast pro (250down/10up) with xfinity in 94550. the cm600, firmware version shows V1.01.18, is connected to a ubiquiti edgerouter-x running latest 1.10.9 firmware. i use the smart que...
persaonally i feel that it is plant noise. we had that years ago and was why i left comcast. but we came back because att was too slow. it's been good for nearly 2 years... not intermittently bad. but at least i can fix it.
i was hoping it might be a modem issue that could be fixed by firmware... i guess not?
Your power levels are out of sync. Your upstream levels are a bit to high and your downstream is a bit to low. Your best download is just within spec and your worse is out of spec. Its imbalanced and out of spec. Here's a website with some basic specs that are easy to interpret.
https://pickmymodem.com/signal-levels-docsis-3-03-1-cable-modem/
Did you go through and check connectors, cables, splitters? I had a cable with water in it once that caused an imbalance. I would more your router to right where it comes into your house and connect there to see what your connections are. this reduces the chances of bad connections/wires/splitters causing the issue. If you move the modem, post back here what the signals change to.
there's a splitter infront of the cm600 to feed the xfinity digital voice. i've removed that splitter and the levels are instantly better:
<tabindex=-1>Downstream Bonded Channels</tabindex=-1> Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 22 597000000 Hz -4.9 dBmV 38.5 dB 0 0 2 Locked QAM256 1 465000000 Hz -2.3 dBmV 40.0 dB 0 0 3 Locked QAM256 2 471000000 Hz -2.7 dBmV 39.9 dB 0 0 4 Locked QAM256 3 477000000 Hz -2.7 dBmV 39.9 dB 0 0 5 Locked QAM256 4 483000000 Hz -2.7 dBmV 39.9 dB 0 0 6 Locked QAM256 5 489000000 Hz -2.8 dBmV 39.9 dB 0 0 7 Locked QAM256 6 495000000 Hz -2.9 dBmV 39.9 dB 0 0 8 Locked QAM256 15 555000000 Hz -4.5 dBmV 38.9 dB 0 0 9 Locked QAM256 16 561000000 Hz -4.6 dBmV 38.7 dB 0 0 10 Locked QAM256 17 567000000 Hz -4.8 dBmV 38.7 dB 0 0 11 Locked QAM256 18 573000000 Hz -4.8 dBmV 38.7 dB 0 0 12 Locked QAM256 19 579000000 Hz -4.8 dBmV 38.6 dB 0 0 13 Locked QAM256 20 585000000 Hz -4.6 dBmV 38.8 dB 0 0 14 Locked QAM256 21 591000000 Hz -4.7 dBmV 38.6 dB 0 0 15 Locked QAM256 23 603000000 Hz -4.9 dBmV 38.5 dB 0 0 16 Locked QAM256 24 609000000 Hz -4.7 dBmV 38.6 dB 0 0 17 Locked QAM256 25 615000000 Hz -4.7 dBmV 38.5 dB 0 0 18 Locked QAM256 26 621000000 Hz -4.9 dBmV 38.2 dB 0 0 19 Locked QAM256 27 627000000 Hz -5.2 dBmV 37.9 dB 0 0 20 Locked QAM256 28 633000000 Hz -5.3 dBmV 37.8 dB 0 0 21 Locked QAM256 29 639000000 Hz -5.4 dBmV 37.8 dB 0 0 22 Locked QAM256 30 645000000 Hz -5.5 dBmV 37.5 dB 0 0 23 Locked QAM256 31 651000000 Hz -5.5 dBmV 37.6 dB 0 0 24 Locked QAM256 32 657000000 Hz -5.6 dBmV 37.5 dB 0 0 <tabindex=-1>Upstream Bonded Channels</tabindex=-1> Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 2 5120 Ksym/sec 23700000 Hz 47.3 dBmV 2 Locked ATDMA 1 5120 Ksym/sec 17300000 Hz 47.0 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 30300000 Hz 48.0 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 36700000 Hz 49.3 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV i'm not sure what to do about this... so next text is disconnect the voice modem and reintroduce the splitter...
now with splitter but the voice modem is disconnected:
<tabindex=-1>Downstream Bonded Channels</tabindex=-1> Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 22 597000000 Hz -7.9 dBmV 38.7 dB 0 0 2 Locked QAM256 1 465000000 Hz -5.5 dBmV 40.1 dB 0 0 3 Locked QAM256 3 477000000 Hz -5.9 dBmV 40.0 dB 0 0 4 Locked QAM256 5 489000000 Hz -6.0 dBmV 40.0 dB 0 0 5 Locked QAM256 6 495000000 Hz -6.0 dBmV 40.0 dB 0 0 6 Locked QAM256 13 543000000 Hz -7.4 dBmV 39.2 dB 0 0 7 Locked QAM256 14 549000000 Hz -7.4 dBmV 39.2 dB 0 0 8 Locked QAM256 15 555000000 Hz -7.3 dBmV 39.2 dB 0 0 9 Locked QAM256 16 561000000 Hz -7.7 dBmV 38.9 dB 0 0 10 Locked QAM256 17 567000000 Hz -7.6 dBmV 39.1 dB 0 0 11 Locked QAM256 18 573000000 Hz -7.9 dBmV 38.9 dB 0 0 12 Locked QAM256 19 579000000 Hz -7.8 dBmV 38.9 dB 0 0 13 Locked QAM256 20 585000000 Hz -7.7 dBmV 38.9 dB 0 0 14 Locked QAM256 21 591000000 Hz -7.9 dBmV 38.8 dB 0 0 15 Locked QAM256 23 603000000 Hz -8.0 dBmV 38.6 dB 0 0 16 Locked QAM256 24 609000000 Hz -7.9 dBmV 38.6 dB 0 0 17 Locked QAM256 25 615000000 Hz -7.8 dBmV 38.6 dB 0 0 18 Locked QAM256 26 621000000 Hz -8.1 dBmV 38.2 dB 0 0 19 Locked QAM256 27 627000000 Hz -8.2 dBmV 38.1 dB 0 0 20 Locked QAM256 28 633000000 Hz -8.2 dBmV 37.8 dB 0 0 21 Locked QAM256 29 639000000 Hz -8.2 dBmV 37.9 dB 0 0 22 Locked QAM256 30 645000000 Hz -8.4 dBmV 37.8 dB 0 0 23 Locked QAM256 31 651000000 Hz -8.2 dBmV 37.9 dB 0 0 24 Locked QAM256 32 657000000 Hz -8.2 dBmV 37.9 dB 0 0 <tabindex=-1>Upstream Bonded Channels</tabindex=-1> Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 3 5120 Ksym/sec 30300000 Hz 51.3 dBmV 2 Locked ATDMA 1 5120 Ksym/sec 17300000 Hz 49.8 dBmV 3 Locked ATDMA 2 5120 Ksym/sec 23700000 Hz 50.5 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 36700000 Hz 52.0 dBmV 5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Is this at the point where it enters the house?
yep. it's a 1682g. i think there's a etma only modem that's approved by xfinity. might that help?