Visitor
•
1 Message
Extremely Slow Download Speeds
Hello,
Starting around a month ago, my download speeds dropped from ~300 mbps to a ~5-10mbps. At the time, I was told that my modem was out of spec as I our speed was recently upgraded across the network, and so I upgraded to a DOCSIS 3.1 modem, ASUS SB8200. After upgrading, my speeds were even faster than before reaching above 300 mbps. However, in the past few days, the speed to returned to the lows of a consistent 5-15 mbps.
Based on my initial research, and based on what phone support told me, it looks like my downstream channels are awfully low power.
Any advice or insight is appreciated.
Here are the numbers from the modems status page:
| Downstream Bonded Channels | |||||||
|---|---|---|---|---|---|---|---|
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 20 | Locked | QAM256 | 543000000 Hz | -22.7 dBmV | 26.5 dB | 2144539 | 57154 |
| 13 | Locked | QAM256 | 501000000 Hz | -15.5 dBmV | 33.1 dB | 0 | 0 |
| 14 | Locked | QAM256 | 507000000 Hz | -14.8 dBmV | 33.3 dB | 1 | 0 |
| 15 | Locked | QAM256 | 513000000 Hz | -16.2 dBmV | 30.6 dB | 15 | 0 |
| 16 | Locked | QAM256 | 519000000 Hz | -16.6 dBmV | 32.6 dB | 1 | 0 |
| 17 | Locked | QAM256 | 525000000 Hz | -16.7 dBmV | 32.9 dB | 9 | 0 |
| 18 | Locked | QAM256 | 531000000 Hz | -18.4 dBmV | 30.3 dB | 114 | 0 |
| 19 | Locked | QAM256 | 537000000 Hz | -18.2 dBmV | 27.7 dB | 47747 | 5588 |
| 21 | Locked | QAM256 | 549000000 Hz | -23.1 dBmV | 0.0 dB | 288757 | 0 |
| 22 | Not Locked | Unknown | 555000000 Hz | -24.0 dBmV | 0.0 dB | 305452 | 0 |
| 23 | Locked | QAM256 | 561000000 Hz | -21.6 dBmV | 28.4 dB | 18755 | 0 |
| 24 | Locked | QAM256 | 567000000 Hz | -21.4 dBmV | 28.4 dB | 19947 | 0 |
| 25 | Not Locked | Unknown | 573000000 Hz | -25.5 dBmV | 0.0 dB | 0 | 0 |
| 26 | Not Locked | Unknown | 579000000 Hz | -26.4 dBmV | 0.0 dB | 0 | 0 |
| 27 | Not Locked | Unknown | 585000000 Hz | -27.6 dBmV | 0.0 dB | 0 | 0 |
| 28 | Not Locked | Unknown | 591000000 Hz | -26.2 dBmV | 0.0 dB | 0 | 0 |
| 29 | Locked | QAM256 | 597000000 Hz | -25.1 dBmV | 0.0 dB | 825 | 0 |
| 30 | Locked | QAM256 | 603000000 Hz | -21.4 dBmV | 28.4 dB | 16292 | 0 |
| 31 | Locked | QAM256 | 609000000 Hz | -22.9 dBmV | 26.3 dB | 5275039 | 1313613 |
| 32 | Not Locked | Unknown | 615000000 Hz | -28.1 dBmV | 0.0 dB | 0 | 0 |
| 33 | Not Locked | Unknown | 621000000 Hz | -34.2 dBmV | 0.0 dB | 0 | 0 |
| 34 | Not Locked | Unknown | 627000000 Hz | -34.5 dBmV | 0.0 dB | 0 | 0 |
| 35 | Not Locked | Unknown | 633000000 Hz | -34.9 dBmV | 0.0 dB | 0 | 0 |
| 36 | Not Locked | Unknown | 639000000 Hz | -28.5 dBmV | 0.0 dB | 0 | 0 |
| 37 | Not Locked | Unknown | 645000000 Hz | -26.8 dBmV | 0.0 dB | 0 | 0 |
| 38 | Locked | QAM256 | 651000000 Hz | -25.4 dBmV | 0.0 dB | 4049 | 0 |
| 39 | Not Locked | Unknown | 657000000 Hz | -30.7 dBmV | 0.0 dB | 0 | 0 |
| 40 | Not Locked | Unknown | 663000000 Hz | -33.6 dBmV | 0.0 dB | 0 | 0 |
| 41 | Not Locked | Unknown | 669000000 Hz | -27.6 dBmV | 0.0 dB | 0 | 0 |
| 42 | Not Locked | Unknown | 675000000 Hz | -28.8 dBmV | 0.0 dB | 0 | 0 |
| 43 | Not Locked | Unknown | 681000000 Hz | -31.3 dBmV | 0.0 dB | 0 | 0 |
| 44 | Not Locked | Unknown | 687000000 Hz | -28.4 dBmV | 0.0 dB | 0 | 0 |
| 193 | Locked | Other | 957000000 Hz | -2.2 dBmV | 0.0 dB | 0 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
| 1 | 1 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 49.0 dBmV |
| 2 | 2 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 50.0 dBmV |
| 3 | 3 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 50.0 dBmV |
| 4 | 4 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 50.0 dBmV |
Accepted Solution
EG
Expert
•
110.1K Messages
2 years ago
Yep. The downstream power levels and the SNR's are too low /out of spec. And the upstream power is almost out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.
Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, etc.
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
Good luck with it !
0
0