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Acidwyrm's avatar
Acidwyrm
New Contributor
7 years ago

Upgraded to Gigablast - Arris SB8200 Modem - Low Upstream Signal power ~35DBmV

I have had 2 Cox Techs out here.  They found no issues and see 1.1Gbs directly on the line.  After the modem I only get ~300Mbs.  I contacted Arris and they have stated that their specs for the SB8200 require an Upstream signal power range of 45DBmV to 51 DBmV.  I am getting roughly 35DBmV.  I spoke to a Tier 2 tech on the Gigablast team who stated they cannot increase said signal power.  From my own research online it seems like this isn't true.  I posted in my signal readings below, any help would be greatly appreciated.

Procedure Status Comment
Acquire Downstream Channel 957000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
30 Locked QAM256 957000000 Hz -0.5 dBmV 37.5 dB 0 0
1 Locked QAM256 783000000 Hz 1.2 dBmV 39.7 dB 0 0
2 Locked QAM256 789000000 Hz 1.1 dBmV 39.5 dB 0 0
3 Locked QAM256 795000000 Hz 0.8 dBmV 39.3 dB 0 0
4 Locked QAM256 801000000 Hz 0.5 dBmV 39.2 dB 0 0
9 Locked QAM256 831000000 Hz -1.2 dBmV 37.9 dB 0 0
10 Locked QAM256 837000000 Hz -1.4 dBmV 38.1 dB 0 0
11 Locked QAM256 843000000 Hz -1.6 dBmV 37.8 dB 0 0
12 Locked QAM256 849000000 Hz -1.6 dBmV 37.6 dB 0 0
17 Locked QAM256 879000000 Hz -1.5 dBmV 37.8 dB 0 0
18 Locked QAM256 885000000 Hz -1.6 dBmV 37.8 dB 0 0
19 Locked QAM256 891000000 Hz -1.3 dBmV 38.0 dB 0 0
20 Locked QAM256 897000000 Hz -1.1 dBmV 38.0 dB 0 0
21 Locked QAM256 903000000 Hz -1.1 dBmV 37.9 dB 0 0
22 Locked QAM256 909000000 Hz -0.7 dBmV 38.5 dB 0 0
25 Locked QAM256 927000000 Hz -0.4 dBmV 38.6 dB 0 0
26 Locked QAM256 933000000 Hz -0.4 dBmV 38.3 dB 0 0
27 Locked QAM256 939000000 Hz -0.3 dBmV 38.6 dB 0 0
28 Locked QAM256 945000000 Hz -0.3 dBmV 37.9 dB 0 0
29 Locked QAM256 951000000 Hz -0.5 dBmV 37.8 dB 0 0
33 Locked QAM256 357000000 Hz 3.4 dBmV 41.4 dB 0 0
34 Locked QAM256 363000000 Hz 3.3 dBmV 40.7 dB 0 0
35 Locked QAM256 369000000 Hz 3.3 dBmV 41.4 dB 0 0
36 Locked QAM256 375000000 Hz 3.1 dBmV 41.4 dB 0 0
37 Locked QAM256 381000000 Hz 3.0 dBmV 41.0 dB 0 0
38 Locked QAM256 387000000 Hz 2.9 dBmV 40.7 dB 0 0
41 Locked QAM256 405000000 Hz 3.0 dBmV 41.0 dB 0 0
42 Locked QAM256 411000000 Hz 2.9 dBmV 41.0 dB 0 0
43 Locked QAM256 417000000 Hz 3.3 dBmV 41.3 dB 0 0
44 Locked QAM256 423000000 Hz 3.4 dBmV 41.5 dB 0 0
45 Locked QAM256 429000000 Hz 3.6 dBmV 41.4 dB 0 0
46 Locked QAM256 435000000 Hz 3.5 dBmV 41.4 dB 0 0
159 Locked Other 300000000 Hz 7.7 dBmV 39.0 dB 893113968 0

Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 1 Locked SC-QAM 19300000 Hz 6400000 Hz 35.0 dBmV
2 2 Locked SC-QAM 25800000 Hz 6400000 Hz 35.0 dBmV
3 3 Locked SC-QAM 32200000 Hz 6400000 Hz 36.0 dBmV
4 4 Locked SC-QAM 38600000 Hz 6400000 Hz 36.0 dBmV

Current System Time: Thu Jan 10 13:20:45 2019

  • Bruce's avatar
    Bruce
    Honored Contributor III
    7 years ago

    Only Cox can provide the acceptable range of signal strengths for your particular plan and device...not Arris, not Google.

    Generally ranging, upstream power should be between +37 to +55 dBmV but ideally closer to the middle at +46 dBmV.  Yours appear to be in the low end but, as I stated, it really depends on your plan and device.

    • Acidwyrm's avatar
      Acidwyrm
      New Contributor
      7 years ago

      Will the low signal cause my download speed to be 300Mbs or less?