Community Forum

Download Speeds Fluctuating

Highlighted
Regular Visitor

Download Speeds Fluctuating

Over nearly the past year I have dealt with very inconsistent internet speeds, at their best I can get nearly 250mbps and at their worst as low as 4mbps.

Not to mention any time I play video games my ping is constantly fluctuating 50-150ms which makes online games unplayable.

 

The issues had gone away for a few months it seemed but they have returned and I am at a loss as to what to do to fix the problem, ive tried a new router with no improvement (on both wifi and ethernet, currently on ethernet).

 

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25625603000000 Hz-14.4 dBmV33.4 dB400
2LockedQAM25613531000000 Hz-10.7 dBmV37.2 dB30
3LockedQAM25626609000000 Hz-22.6 dBmV26.3 dB1611943324113319139
4LockedQAM25627615000000 Hz-17.1 dBmV31.3 dB20589872
5LockedQAM25628621000000 Hz-15 dBmV33.7 dB260
6LockedQAM25617555000000 Hz-14.8 dBmV33.4 dB160
7LockedQAM25618561000000 Hz-20.5 dBmV28.2 dB317247395606517
8LockedQAM25619567000000 Hz-17 dBmV31.4 dB2425440
9LockedQAM25620573000000 Hz-17.7 dBmV30.7 dB123050
10LockedQAM25621579000000 Hz-16.1 dBmV32.4 dB650
11LockedQAM25622585000000 Hz-21.9 dBmV27 dB76518852857971383
12LockedQAM25623591000000 Hz-20 dBmV28.7 dB3274155540712
13LockedQAM25624597000000 Hz-12.8 dBmV35.1 dB140
14LockedQAM25614537000000 Hz-12.7 dBmV35.6 dB110
15LockedQAM25615543000000 Hz-17.3 dBmV31.3 dB1410
16LockedQAM25616549000000 Hz-13.9 dBmV34.3 dB80
Highlighted
Expert

Re: Download Speeds Fluctuating

The downstream power levels and the SNR's are way out of spec (you didn't post the upstream power figures) !! That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

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.



I am not a Comcast Employee.
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.
Was your question answered? Mark the post as Best Answer!
Highlighted
Regular Visitor

Re: Download Speeds Fluctuating

Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 Ksym/sec23700000 Hz43.3 dBmV
2LockedATDMA15120 Ksym/sec36500000 Hz41.8 dBmV
3LockedATDMA25120 Ksym/sec30100000 Hz45.8 dBmV
4LockedATDMA45120 Ksym/sec17300000 Hz43.3 dBmV

 

Here are the upstream levels, I live in a rental property where all existing splitters and cables etc were already installed. I think it would be best just to have a tech come check out the situation here?

Also, these problems seem to be worse during night then corrected by morning.

For exmaple here are my current downstream levels during the morning:

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM25625603000000 Hz-9.3 dBmV37.2 dB590
2LockedQAM25613531000000 Hz-8.5 dBmV38.2 dB40
3LockedQAM25626609000000 Hz-16.9 dBmV30.8 dB2096295808220922416
4LockedQAM25627615000000 Hz-14.6 dBmV32.4 dB20633472
5LockedQAM25628621000000 Hz-11.6 dBmV36.2 dB340
6LockedQAM25617555000000 Hz-9.8 dBmV36.9 dB290
7LockedQAM25618561000000 Hz-16.7 dBmV30.8 dB348873905607094
8LockedQAM25619567000000 Hz-15 dBmV32.2 dB2428150
9LockedQAM25620573000000 Hz-12.4 dBmV35.1 dB162790
10LockedQAM25621579000000 Hz-12.1 dBmV35.6 dB1240
11LockedQAM25622585000000 Hz-17.7 dBmV29.5 dB147819847480985106
12LockedQAM25623591000000 Hz-17 dBmV30.4 dB3529834040712
13LockedQAM25624597000000 Hz-9.6 dBmV37.1 dB190
14LockedQAM25614537000000 Hz-10.5 dBmV36.7 dB150
15LockedQAM25615543000000 Hz-13.2 dBmV34.7 dB2350
16LockedQAM25616549000000 Hz-9.3 dBmV36.9 dB140
Highlighted
Expert

Re: Download Speeds Fluctuating

The upstream is o/k, the downstream is terrible ! Get a tech out to investigate / correct it if none of that stuff applies.

 

Good luck with it !!



I am not a Comcast Employee.
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.
Was your question answered? Mark the post as Best Answer!