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Getting wildly different results from various speed tests

This is a discussion on Getting wildly different results from various speed tests within the Modems/Cable/DSL/Satellite forums, part of the Tech Support Forum category. Ive just upgraded my modem & router. I am getting different results from different speedtests, both within the same site


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Old 02-27-2016, 11:45 PM   #1
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Ive just upgraded my modem & router. I am getting different results from different speedtests, both within the same site and using different ones. The results were more stable before this. I am trying to get to the bottom of the reason why and I figured I would start with my modem.

I am using a Arris sb6183 modem, wrt1900ac router, network wiring using cat 5e or better, cox internet tier 100/10 coax. All coax connections throughout the house have been cleaned & tightened.

Below is my modem readings. My question at this time is, do these reading look ok or do you see a problem I may not?

Downstream
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 97 813000000 Hz -0.9 dBmV 39.2 dB 529 0
2 Locked QAM256 98 819000000 Hz -1.1 dBmV 39.1 dB 617 0
3 Locked QAM256 99 825000000 Hz -1.0 dBmV 39.1 dB 754 343
4 Locked QAM256 100 831000000 Hz -0.9 dBmV 39.1 dB 681 0
5 Locked QAM256 101 837000000 Hz -0.7 dBmV 39.1 dB 4720 8068
6 Locked QAM256 102 843000000 Hz -0.1 dBmV 38.9 dB 462 0
7 Locked QAM256 103 849000000 Hz 0.3 dBmV 39.5 dB 411 0
8 Locked QAM256 104 855000000 Hz 0.9 dBmV 39.6 dB 205 0
9 Locked QAM256 113 909000000 Hz 0.3 dBmV 39.3 dB 206 0
10 Locked QAM256 114 915000000 Hz 0.4 dBmV 39.4 dB 205 35
11 Locked QAM256 115 921000000 Hz 0.3 dBmV 39.3 dB 252 0
12 Locked QAM256 116 927000000 Hz 0.5 dBmV 39.3 dB 176 0
13 Locked QAM256 117 933000000 Hz 0.2 dBmV 39.2 dB 240 0
14 Locked QAM256 118 939000000 Hz 0.1 dBmV 39.1 dB 264 0
15 Locked QAM256 119 945000000 Hz -0.2 dBmV 38.9 dB 267 81
16 Locked QAM256 120 951000000 Hz -0.1 dBmV 38.8 dB 136 69


Upstream
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 36300000 Hz 37.5 dBmV
2 Locked TDMA and ATDMA 1 2560 Ksym/sec 18400000 Hz 34.5 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 23300000 Hz 35.5 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 29800000 Hz 36.5 dBmV

thank you for your time
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Old 03-01-2016, 02:15 AM   #2
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This is a Cable Modem Guideline I will refer to if I have issues; What cable modem signal levels are considered good ? :: SG FAQ

Your DownStream Power looks high, generally you are looking for a -15dB to +15dB, could be a bad / weak splitter in the line.

UpStream Power looks Ok. You want a 37dB to 55dB

What is your SnR (Signal to Noise Ratio) on the modem.
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Old 03-04-2016, 05:45 PM   #3
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Apologies, cutting and pasting my stats didn't line up the columns correctly.

These readings were taken from the modem as of the time of this post and may slightly differ from the stats above.

Downstream

Power
-2.3 dBmV
-2.5 dBmV
-2.6 dBmV
-2.6 dBmV
-2.2 dBmV
-1.5 dBmV
-1.1 dBmV
-0.6 dBmV
-1.7 dBmV
-1.6 dBmV
-1.6 dBmV
-1.5 dBmV
-1.9 dBmV
-2.0 dBmV
-2.2 dBmV
-2.0 dBmV


SNR
39.1 dB
38.9 dB
38.9 dB
38.9 dB
39.0 dB
38.8 dB
39.4 dB
39.6 dB
39.2 dB
39.2 dB
39.1 dB
39.1 dB
39.0 dB
38.9 dB
38.6 dB
38.6 dB


Ill check out the link you provided. Thank you.
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