Speed drop

I've been experiencing a drastic drop in down load performance lately. I'm set up for 900mbs down and lately been getting only 25-35. This didn't used to happen at all, but started a few weeks ago and was solved by re-starting the modem. However today, even re-starting the modem didn't solve the problem. It shouldn't be necessary to re-start the modem very often at all and that was how it used to be.

Responses

EG

Expert

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110.1K Messages

3 years ago

What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1 or here http://10.0.0.1

Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.

What is the exact make and model number of the modem ?

Is this a WiFi connection ?

XfinityRyanE

Official Employee

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1.1K Messages

3 years ago

Hello @sorabji, thank you for reaching out for help with your connection. To make sure we don't have you repeat anything you may have already tried, please take a look at our internet troubleshooting guide: Xfinity Internet and WiFi Connection Troubleshooting - Xfinity Support, and let us know what you have already done on your end.

Please let us know if you run into any trouble or have any questions.

sorabji

Visitor

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3 Messages

@XfinityRyanE

Need to schedule a tech visit due to low downstream modem power levels. See later post in this thread where I posted that.

Thanks.

3 years ago

CCChe

Official Employee

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6.9K Messages

I'd be happy to help get that tech scheduled if necessary still @sorabji. Can you provide updated signal levels since these were from over a week ago?

I no longer work for Comcast.

3 years ago

EG

Expert

•

110.1K Messages

3 years ago

@sorabji

Have you had a chance to gather the info that I requested ?

sorabji

Visitor

•

3 Messages

@EG

Problem appears to have mostly fixed itself. Download speeds gradually drop by around 20% starting about halfway through the test.

@EG

Sorry, I've been very distracted, hence the late response.

I changed the speed tier to 600 b/c of this problem.

Performance has improved lately, but still seems a bit off, as it slowly drops off after about halfway through a speed test to under 400. Initially, it hits around 740, which is around where it should be given over provisioning.

Below are the stats you requested:

Apply Cancel

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure Status Comment
Acquire Downstream Channel 621000000 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 / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 12 621000000 Hz -10.3 dBmV 42.8 dB 45520022 0 0
2 Locked QAM256 1 555000000 Hz -10.2 dBmV 43.4 dB 44469308 0 0
3 Locked QAM256 2 561000000 Hz -10.4 dBmV 43.0 dB 44473283 0 0
4 Locked QAM256 3 567000000 Hz -10.3 dBmV 43.1 dB 44476742 0 0
5 Locked QAM256 4 573000000 Hz -10.5 dBmV 42.9 dB 44480502 0 0
6 Locked QAM256 5 579000000 Hz -10.0 dBmV 43.2 dB 44484428 0 0
7 Locked QAM256 6 585000000 Hz -10.3 dBmV 43.0 dB 44487824 0 0
8 Locked QAM256 7 591000000 Hz -10.4 dBmV 42.8 dB 44491479 0 0
9 Locked QAM256 8 597000000 Hz -10.5 dBmV 42.9 dB 44495440 0 0
10 Locked QAM256 9 603000000 Hz -10.8 dBmV 42.5 dB 44499318 0 0
11 Locked QAM256 10 609000000 Hz -10.3 dBmV 42.8 dB 44502763 0 0
12 Locked QAM256 11 615000000 Hz -10.8 dBmV 42.4 dB 44506964 0 0
13 Locked QAM256 13 627000000 Hz -10.8 dBmV 42.3 dB 44510063 0 0
14 Locked QAM256 14 633000000 Hz -10.8 dBmV 42.3 dB 44512786 0 0
15 Locked QAM256 15 639000000 Hz -10.6 dBmV 42.4 dB 44518191 0 0
16 Locked QAM256 16 645000000 Hz -11.5 dBmV 41.7 dB 44521115 0 0
17 Locked QAM256 17 651000000 Hz -10.5 dBmV 42.4 dB 44525378 0 0
18 Locked QAM256 18 657000000 Hz -11.7 dBmV 41.3 dB 44528375 0 0
19 Locked QAM256 19 663000000 Hz -10.7 dBmV 42.1 dB 44532456 0 0
20 Locked QAM256 20 669000000 Hz -11.4 dBmV 41.5 dB 44537243 0 0
21 Locked QAM256 21 675000000 Hz -11.4 dBmV 40.8 dB 44539794 0 0
22 Locked QAM256 22 681000000 Hz -10.9 dBmV 42.1 dB 44544008 0 0
23 Locked QAM256 23 687000000 Hz -12.1 dBmV 40.8 dB 44547835 0 0
24 Locked QAM256 24 693000000 Hz -10.6 dBmV 42.1 dB 44551819 0 0
25 Locked QAM256 25 699000000 Hz -12.4 dBmV 40.7 dB 44554712 0 0
26 Locked QAM256 26 705000000 Hz -10.8 dBmV 41.9 dB 44558821 0 0
27 Locked QAM256 27 711000000 Hz -11.8 dBmV 41.0 dB 44562823 0 0
28 Locked QAM256 28 717000000 Hz -11.9 dBmV 40.8 dB 44565499 0 0
29 Locked QAM256 29 723000000 Hz -11.5 dBmV 41.1 dB 44570306 0 0
30 Locked QAM256 30 729000000 Hz -13.4 dBmV 39.2 dB 44573720 0 0
31 Locked QAM256 31 735000000 Hz -11.5 dBmV 40.7 dB 44574984 0 0
32 Locked QAM256 32 741000000 Hz -13.9 dBmV 39.2 dB 44573832 0 0

<tabindex=-1>Upstream Bonded Channels</tabindex=-1>

Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 35600000 Hz 45.8 dBmV
2 Locked ATDMA 2 29200000 Hz 44.8 dBmV
3 Locked ATDMA 3 22800000 Hz 43.8 dBmV
4 Locked ATDMA 4 16400000 Hz 43.3 dBmV
5 Locked ATDMA 5 40400000 Hz 45.5 dBmV
6 Locked ATDMA 6 10400000 Hz 41.8 dBmV
7 Not Locked Unknown 0 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Hz 0.0 dBmV

<tabindex=-1>Downstream OFDM Channels</tabindex=-1>

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked 0, 1 193 957000000 Hz -21.3 dBmV 22.5 dB 1108 ~ 2987 4700380 3110704 1589671
2 Not Locked 0 0 0 Hz -8.9 dBmV 0.0 dB 0 ~ 4095 0 0 0

<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>

Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked Unknown 0 0 Hz 0 dBmV
2 Not Locked Unknown 0 0 Hz 0 dBmV

Current System Time: Sun Jan 23 00:11:53 2022

System Up Time: 0:17:03

3 years ago

EG

Expert

•

110.1K Messages

3 years ago

The downstream power is too low / weak and it may be intermittently fluctuating even lower 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, 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 !

Your Home Network

sorabji

Speed drop

EG

XfinityRyanE

sorabji

CCChe

EG

sorabji

EG

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