Visitor
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4 Messages
Downstream light blinking
I have been having issues the past couple of days with my modems downstream light blinking and random laggy connections. Ive replaced coax cabled in my apartment. atleast the ones that i could to ensure it wasnt any of those. I noticed that 2 of my downstream channels arent locked. Here is a table to my modems downstream channels.
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Correctables | Uncorrectables |
| 1 | Locked | QAM256 | 29 | 651000000 Hz | -10.7 dBmV | 37.2 dB | 0 | 0 |
| 2 | Locked | QAM256 | 17 | 579000000 Hz | -11.7 dBmV | 32.3 dB | 0 | 0 |
| 3 | Locked | QAM256 | 18 | 585000000 Hz | -11.4 dBmV | 34.0 dB | 0 | 0 |
| 4 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 |
| 5 | Not Locked | Unknown | 0 | 0 Hz | 0.0 dBmV | 0.0 dB | 0 | 0 |
| 6 | Locked | QAM256 | 21 | 603000000 Hz | -11.6 dBmV | 32.6 dB | 0 | 0 |
| 7 | Locked | QAM256 | 22 | 609000000 Hz | -11.9 dBmV | 37.0 dB | 0 | 0 |
| 8 | Locked | QAM256 | 23 | 615000000 Hz | -12.1 dBmV | 36.9 dB | 0 | 0 |
| 9 | Locked | QAM256 | 24 | 621000000 Hz | -11.8 dBmV | 36.3 dB | 0 | 0 |
| 10 | Locked | QAM256 | 25 | 627000000 Hz | -11.6 dBmV | 34.6 dB | 6125 | 0 |
| 11 | Locked | QAM256 | 26 | 633000000 Hz | -10.8 dBmV | 36.3 dB | 12197 | 7 |
| 12 | Locked | QAM256 | 27 | 639000000 Hz | -11.2 dBmV | 36.1 dB | 55891 | 14494 |
| 13 | Locked | QAM256 | 28 | 645000000 Hz | -11.0 dBmV | 30.7 dB | 1137968 | 1564435 |
| 14 | Locked | QAM256 | 30 | 657000000 Hz | -11.0 dBmV | 37.1 dB | 0 | 0 |
| 15 | Locked | QAM256 | 32 | 663000000 Hz | -11.6 dBmV | 36.9 dB | 0 | 0 |
| 16 | Locked | QAM256 | 33 | 669000000 Hz | -12.1 dBmV | 36.6 dB | 0 | 0 |
ItsMikeyBee
Visitor
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4 Messages
3 years ago
Also note that this is also after restarting my modem.
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EG
Expert
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112.1K Messages
3 years ago
The downstream power is weak / too low as are some of the SNR values. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
I'm going to provide some tips that may or may not apply. YMMV.
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 !
(edited)
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EG
Expert
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112.1K Messages
3 years ago
You didn't post the upstream, but the downstream is a bit better but it's still on the weak side. You should book a tech visit as the power appears to be too weak coming from the pole to begin with. Excess attenuation needs to be removed or an amp needs to be adjusted.
Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home. And if the problem is found to be on their side of the demarcation point, there will not be any charge.
Good luck !
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