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tgies's avatar
tgies
New Contributor
5 years ago

Cox system won't "let" techs schedule service call to remove old filter, so no docsis 3.1

Hi, I recently upgraded to a DOCSIS 3.1 modem and Gigablast and I have what is pretty clearly the textbook problem where an old analog filter on the line blocks channels below about 600MHz, prevent...
DOCSIS 3.1
filter
Gigablast
sb8200
service request
tgies's avatar
tgies
New Contributor
5 years ago

Here's the modem specan showing what I think is clear evidence of the filter: https://i.imgur.com/2T9lRJ6.png

And here's the channel status dump:

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
22 Locked QAM256 909000000 Hz 5.3 dBmV 40.8 dB 0 0
1 Locked QAM256 783000000 Hz 9.3 dBmV 41.6 dB 0 0
2 Locked QAM256 789000000 Hz 9.2 dBmV 41.6 dB 0 0
3 Locked QAM256 795000000 Hz 9.6 dBmV 41.9 dB 0 0
4 Locked QAM256 801000000 Hz 9.3 dBmV 41.7 dB 0 0
9 Locked QAM256 831000000 Hz 8.9 dBmV 41.7 dB 0 0
10 Locked QAM256 837000000 Hz 8.6 dBmV 41.6 dB 0 0
11 Locked QAM256 843000000 Hz 8.4 dBmV 41.6 dB 0 0
12 Locked QAM256 849000000 Hz 8.3 dBmV 41.7 dB 0 0
17 Locked QAM256 879000000 Hz 6.6 dBmV 41.4 dB 0 0
18 Locked QAM256 885000000 Hz 5.9 dBmV 41.0 dB 0 0
19 Locked QAM256 891000000 Hz 5.5 dBmV 41.0 dB 0 0
20 Locked QAM256 897000000 Hz 4.9 dBmV 40.7 dB 0 0
21 Locked QAM256 903000000 Hz 4.8 dBmV 40.7 dB 0 0
25 Locked QAM256 927000000 Hz 5.3 dBmV 40.6 dB 0 0
26 Locked QAM256 933000000 Hz 5.5 dBmV 40.9 dB 0 0
27 Locked QAM256 939000000 Hz 5.4 dBmV 40.7 dB 0 0
28 Locked QAM256 945000000 Hz 5.5 dBmV 40.7 dB 0 0
29 Locked QAM256 951000000 Hz 5.5 dBmV 40.6 dB 0 0
30 Locked QAM256 957000000 Hz 5.2 dBmV 40.6 dB 0 0
33 Not Locked Unknown 357000000 Hz -39.4 dBmV 0.0 dB 0 0
34 Not Locked Unknown 363000000 Hz -39.2 dBmV 0.0 dB 0 0
35 Not Locked Unknown 369000000 Hz -39.0 dBmV 0.0 dB 0 0
36 Not Locked Unknown 375000000 Hz -39.0 dBmV 0.0 dB 0 0
37 Not Locked Unknown 381000000 Hz -39.0 dBmV 0.0 dB 0 0
38 Not Locked Unknown 387000000 Hz -38.9 dBmV 0.0 dB 0 0
41 Not Locked Unknown 405000000 Hz -39.5 dBmV 0.0 dB 0 0
42 Not Locked Unknown 411000000 Hz -39.3 dBmV 0.0 dB 0 0
43 Not Locked Unknown 417000000 Hz -39.2 dBmV 0.0 dB 0 0
44 Not Locked Unknown 423000000 Hz -38.7 dBmV 0.0 dB 0 0
45 Not Locked Unknown 429000000 Hz -38.0 dBmV 0.0 dB 0 0
46 Not Locked Unknown 435000000 Hz -37.2 dBmV 0.0 dB 0 0
159 Locked Other 300000000 Hz -38.3 dBmV 0.0 dB 0 0

Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 4 Locked SC-QAM 36700000 Hz 6400000 Hz 35.1 dBmV
2 1 Locked SC-QAM 17400000 Hz 6400000 Hz 30.9 dBmV
3 2 Locked SC-QAM 23900000 Hz 6400000 Hz 31.9 dBmV
4 3 Locked SC-QAM 30300000 Hz 6400000 Hz 33.4 dBmV