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Reduced line quality in wet weather

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Contributor

Reduced line quality in wet weather

Below are stats from my modem (Netgear CM600) and a graph from my firewall of my deteriorating line quality since the rain started in earnest yesterday afternoon.  It seems whenever the weather turns wet I get this problem.  Because of a quality problem earlier this year, a new line was run from the pole underground to my house to replace the 30+ year old overhead line.  Is this a problem in my general neighborhood location or specific to me?  Should I reboot my modem and restart the count?  

Starting Frequency
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 573000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only
 
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 9 573000000 Hz 3.8 dBmV 40.0 dB 1548 1123
2 Locked QAM256 38 471000000 Hz 1.3 dBmV 39.4 dB 1393 952
3 Locked QAM256 39 477000000 Hz 1.0 dBmV 39.3 dB 1629 1310
4 Locked QAM256 40 483000000 Hz 1.0 dBmV 39.3 dB 1670 1188
5 Locked QAM256 41 489000000 Hz 1.3 dBmV 39.5 dB 502 1058
6 Locked QAM256 33 495000000 Hz 1.9 dBmV 39.7 dB 874 1687
7 Locked QAM256 34 507000000 Hz 2.9 dBmV 37.4 dB 1127 1692
8 Locked QAM256 35 513000000 Hz 2.7 dBmV 39.9 dB 1018 1629
9 Locked QAM256 36 519000000 Hz 2.7 dBmV 39.9 dB 1653 1547
10 Locked QAM256 1 525000000 Hz 2.3 dBmV 39.8 dB 1772 1804
11 Locked QAM256 2 531000000 Hz 2.0 dBmV 39.7 dB 1214 1353
12 Locked QAM256 3 537000000 Hz 2.1 dBmV 39.8 dB 1424 1669
13 Locked QAM256 4 543000000 Hz 2.1 dBmV 39.8 dB 1327 1394
14 Locked QAM256 5 549000000 Hz 3.1 dBmV 40.0 dB 1495 2163
15 Locked QAM256 6 555000000 Hz 3.4 dBmV 40.0 dB 357 1063
16 Locked QAM256 7 561000000 Hz 3.9 dBmV 40.0 dB 435 1099
17 Locked QAM256 8 567000000 Hz 4.1 dBmV 41.4 dB 0 0
18 Locked QAM256 10 579000000 Hz 3.6 dBmV 41.3 dB 0 0
19 Locked QAM256 11 585000000 Hz 2.6 dBmV 40.8 dB 0 0
20 Locked QAM256 12 591000000 Hz 2.1 dBmV 40.3 dB 0 0
21 Locked QAM256 13 597000000 Hz 1.9 dBmV 40.3 dB 0 0
22 Locked QAM256 14 603000000 Hz 1.7 dBmV 40.3 dB 0 0
23 Locked QAM256 15 609000000 Hz 2.6 dBmV 40.7 dB 0 0
24 Locked QAM256 16 615000000 Hz 3.4 dBmV 41.4 dB 0 0
 
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 16600000 Hz 49.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 50.0 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29400000 Hz 49.8 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 23000000 Hz 49.3 dBmV
5 Locked ATDMA 9 1280 Ksym/sec 39800000 Hz 47.8 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Current System Time: Wed Apr 29 06:14:27 2020
System Up Time: 235:42:13
 

 

Capture.JPG
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Expert

Re: Reduced line quality in wet weather

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting 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 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

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.



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Contributor

Re: Reduced line quality in wet weather

Thanks for your reply.   The splitter was already changed on Comcast's last visit.  There is a single splitter in the demarc that splits HD and Inet.  There's about a 2" roof overhang over the the demarc, so it's not wet.  No other splitters downline from the demarc on the Inet line and the connections have already been loosened and tightened.  Likely not related, but the signal staus on the X1 box lists as "Good".  I've tried to monitor this pretty closely since thereplacement.  Seems to be weather related.  Think I should just clear the modem and start monitoring while it's still wet out?  Thanks again.

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Contributor

Re: Reduced line quality in wet weather

Not sure what changed as the error count has not increased but the quality has improved greatly.  The weather has dried out as well.  Just going to clear the counters and start fresh.

 

Starting Frequency
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 573000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only
 
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 9 573000000 Hz 3.3 dBmV 39.9 dB 1548 1123
2 Locked QAM256 38 471000000 Hz 2.2 dBmV 39.6 dB 1393 952
3 Locked QAM256 39 477000000 Hz 2.2 dBmV 39.6 dB 1629 1310
4 Locked QAM256 40 483000000 Hz 2.2 dBmV 39.5 dB 1670 1188
5 Locked QAM256 41 489000000 Hz 2.3 dBmV 39.5 dB 502 1058
6 Locked QAM256 33 495000000 Hz 2.4 dBmV 39.6 dB 874 1687
7 Locked QAM256 34 507000000 Hz 2.7 dBmV 37.2 dB 1127 1692
8 Locked QAM256 35 513000000 Hz 2.7 dBmV 39.7 dB 1018 1629
9 Locked QAM256 36 519000000 Hz 2.9 dBmV 39.7 dB 1653 1547
10 Locked QAM256 1 525000000 Hz 3.0 dBmV 39.8 dB 1772 1804
11 Locked QAM256 2 531000000 Hz 3.1 dBmV 39.8 dB 1214 1353
12 Locked QAM256 3 537000000 Hz 3.4 dBmV 39.9 dB 1424 1669
13 Locked QAM256 4 543000000 Hz 3.1 dBmV 39.8 dB 1327 1394
14 Locked QAM256 5 549000000 Hz 3.5 dBmV 39.9 dB 1495 2163
15 Locked QAM256 6 555000000 Hz 3.2 dBmV 39.8 dB 357 1063
16 Locked QAM256 7 561000000 Hz 3.2 dBmV 39.7 dB 435 1099
17 Locked QAM256 8 567000000 Hz 3.2 dBmV 40.9 dB 0 0
18 Locked QAM256 10 579000000 Hz 3.4 dBmV 41.3 dB 0 0
19 Locked QAM256 11 585000000 Hz 3.2 dBmV 41.3 dB 0 0
20 Locked QAM256 12 591000000 Hz 3.3 dBmV 40.8 dB 0 0
21 Locked QAM256 13 597000000 Hz 3.4 dBmV 40.9 dB 0 0
22 Locked QAM256 14 603000000 Hz 3.3 dBmV 40.8 dB 0 0
23 Locked QAM256 15 609000000 Hz 3.5 dBmV 40.8 dB 0 0
24 Locked QAM256 16 615000000 Hz 3.3 dBmV 40.9 dB 0 0
 
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 4 5120 Ksym/sec 16600000 Hz 49.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 49.8 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29400000 Hz 49.5 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 23000000 Hz 49.3 dBmV
5 Locked ATDMA 9 1280 Ksym/sec 39800000 Hz 47.8 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Current System Time: Fri May 01 01:59:47 2020

System Up Time: 279:27:33

 

Capture.JPG
Highlighted
Expert

Re: Reduced line quality in wet weather

Don't be surprised if the problem returns. The upstream power is still borderline. You should get a tech out to investigate / correct.

 

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.

Good luck with it !

 

 

 

 



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I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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