Visitor
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Poor power levels and SNR
I've been experiencing a lot of T3 timeouts, inconsistent download and upload speeds. When I call, all the rep does is refresh the signal and then blame my Arris SB6190. Looking into the downstream bonded channels, it looks like the power levels are within spec numbers wise, but are not tight across the board, ranging from 1.70 dBmV to as low as 7.70. Also the SNR is below 35 on many channel. Also on the upstream bonded channels, the power levels are below spec, topping out at 32 dBmV.
My drop comes from the pole, to the box on my outside where it connects to a 1 to 1 splitter with a ground. That then goes directly to my modem, its not split anywhere else. On the high end, and what was normal for some time was around 700-600 down, 40-30 up. The last 24 hours I have been getting around 400-150 down, 12-4 up with wild variance between test. Mind you, I am paying for 1200 down but was ok with getting to 700 consistently. However the service has been terrible for weeks now and hit an all time low last night, unacceptable service.
| Downstream Bonded Channels | ||||||||
|---|---|---|---|---|---|---|---|---|
| Channel | Lock Status | Modulation | Channel ID | Frequency | Power | SNR | Corrected | Uncorrectables |
| 1 | Locked | 256QAM | 1 | 483.00 MHz | -2.20 dBmV | 34.48 dB | 0 | 0 |
| 2 | Locked | 256QAM | 42 | 393.00 MHz | 0.60 dBmV | 34.93 dB | 32 | 0 |
| 3 | Locked | 256QAM | 43 | 399.00 MHz | 0.40 dBmV | 34.48 dB | 5 | 0 |
| 4 | Locked | 256QAM | 44 | 405.00 MHz | 0.40 dBmV | 34.35 dB | 9 | 0 |
| 5 | Locked | 256QAM | 45 | 411.00 MHz | 0.50 dBmV | 34.48 dB | 0 | 0 |
| 6 | Locked | 256QAM | 34 | 417.00 MHz | 0.20 dBmV | 34.93 dB | 9 | 0 |
| 7 | Locked | 256QAM | 35 | 423.00 MHz | -0.10 dBmV | 35.08 dB | 5 | 0 |
| 8 | Locked | 256QAM | 36 | 435.00 MHz | -0.50 dBmV | 34.93 dB | 0 | 0 |
| 9 | Locked | 256QAM | 37 | 453.00 MHz | -1.20 dBmV | 34.48 dB | 4 | 0 |
| 10 | Locked | 256QAM | 38 | 459.00 MHz | -1.60 dBmV | 34.93 dB | 0 | 0 |
| 11 | Locked | 256QAM | 39 | 465.00 MHz | -1.60 dBmV | 34.93 dB | 0 | 0 |
| 12 | Locked | 256QAM | 40 | 471.00 MHz | -1.80 dBmV | 35.08 dB | 0 | 0 |
| 13 | Locked | 256QAM | 41 | 477.00 MHz | -2.00 dBmV | 34.93 dB | 0 | 0 |
| 14 | Locked | 256QAM | 2 | 489.00 MHz | -2.70 dBmV | 34.35 dB | 0 | 0 |
| 15 | Locked | 256QAM | 3 | 495.00 MHz | -2.80 dBmV | 34.93 dB | 0 | 0 |
| 16 | Locked | 256QAM | 4 | 501.00 MHz | -3.00 dBmV | 34.48 dB | 0 | 0 |
| 17 | Locked | 256QAM | 5 | 507.00 MHz | -3.10 dBmV | 34.93 dB | 0 | 0 |
| 18 | Locked | 256QAM | 6 | 513.00 MHz | -3.50 dBmV | 34.35 dB | 0 | 0 |
| 19 | Locked | 256QAM | 7 | 519.00 MHz | -3.90 dBmV | 34.48 dB | 0 | 0 |
| 20 | Locked | 256QAM | 8 | 525.00 MHz | -4.00 dBmV | 33.83 dB | 1 | 0 |
| 21 | Locked | 256QAM | 9 | 531.00 MHz | -4.40 dBmV | 33.83 dB | 0 | 0 |
| 22 | Locked | 256QAM | 10 | 537.00 MHz | -4.70 dBmV | 34.35 dB | 4 | 0 |
| 23 | Locked | 256QAM | 11 | 543.00 MHz | -5.00 dBmV | 33.96 dB | 4 | 0 |
| 24 | Locked | 256QAM | 12 | 549.00 MHz | -5.30 dBmV | 33.96 dB | 0 | 0 |
| 25 | Locked | 256QAM | 13 | 555.00 MHz | -5.70 dBmV | 33.80 dB | 0 | 0 |
| 26 | Locked | 256QAM | 14 | 561.00 MHz | -5.80 dBmV | 33.20 dB | 0 | 0 |
| 27 | Locked | 256QAM | 15 | 567.00 MHz | -6.30 dBmV | 33.50 dB | 0 | 0 |
| 28 | Locked | 256QAM | 16 | 573.00 MHz | -6.70 dBmV | 33.20 dB | 0 | 0 |
| 29 | Locked | 256QAM | 17 | 579.00 MHz | -7.20 dBmV | 33.10 dB | 0 | 0 |
| 30 | Locked | 256QAM | 18 | 585.00 MHz | -7.30 dBmV | 33.10 dB | 0 | 0 |
| 31 | Locked | 256QAM | 19 | 591.00 MHz | -7.60 dBmV | 32.90 dB | 0 | 0 |
| 32 | Locked | 256QAM | 20 | 597.00 MHz | -7.90 dBmV | 32.70 dB | 0 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Lock Status | US Channel Type | Channel ID | Symbol Rate | Frequency | Power |
| 1 | Locked | ATDMA | 3 | 5120 kSym/s | 22.80 MHz | 31.00 dBmV |
| 2 | Locked | ATDMA | 5 | 1280 kSym/s | 39.60 MHz | 32.00 dBmV |
| 3 | Locked | ATDMA | 4 | 5120 kSym/s | 16.40 MHz | 30.00 dBmV |
| 4 | Locked | ATDMA | 2 | 5120 kSym/s | 29.20 MHz | 31.50 dBmV |
| 5 | Locked | ATDMA | 1 | 5120 kSym/s | 35.60 MHz | 32.00 dBmV |
| Thu Jan 01 00:01:44 1970 | 3 | No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 02:02:45 2022 | 6 | TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 10:06:51 2022 | 3 | No Ranging Response received - T3 time-out;;CM-VER=3.0; |
| Sat Feb 26 12:08:48 2022 | 5 | RCS Partial Service;CM-CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:08:49 2022 | 3 | SYNC Timing Synchronization failure - Loss of Sync;;CM-VER=3.0; |
| Sat Feb 26 12:08:49 2022 | 5 | RCS Partial Service;;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:08:50 2022 | 3 | SYNC Timing Synchronization failure - Loss of Sync;;CM-VER=3.0; |
| Sat Feb 26 12:08:50 2022 | 5 | RCS Partial Service;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:08:53 2022 | 5 | Lost MDD Timeout;CM-MAC=CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:10:19 2022 | 5 | RCS Partial Service;CM-MAC=CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:10:53 2022 | 3 | No Ranging Response received - T3 time-out;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:02 2022 | 5 | RCS Partial Service;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:03 2022 | 3 | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:03 2022 | 5 | RCS Partial Service;CM-MAC=CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:03 2022 | 3 | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:03 2022 | 5 | RCS Partial Service;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:08 2022 | 5 | Lost MDD Timeout;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:21:09 2022 | 5 | RCS Partial Service;CM-MAC=CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 12:28:50 2022 | 6 | TLV-11 - unrecognized OID;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
| Sat Feb 26 13:56:09 2022 | 3 | No Ranging Response received - T3 time-out;CM-MAC=;CM-QOS=1.1;CM-VER=3.0; |
EG
Expert
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110.6K Messages
3 years ago
You got some of what is called *cable tilt* going on with the downstream power. The SNR's are too low / out of spec. Looks like some spurious noise is leaking into the line(s) somewhere. The upstream power is fine.
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, 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, 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 !
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