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19 Messages

Wednesday, June 11th, 2025

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Speed slower than usual and power levels low

Hi,

Had a power outage last month that lasted a day and my power levels have never recovered. used to be 7-9, now at 2. I know within spec. And speed tests have dropped from 800-900 to 300 on a Blast Plan (1200). S33 modem v1. Central PA.

Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
12 Locked QAM256 471000000 Hz 2 dBmV 43 dB 279 0
1 Locked QAM256 393000000 Hz 0 dBmV 42 dB 399 0
2 Locked QAM256 399000000 Hz 1 dBmV 42 dB 403 0
3 Locked QAM256 405000000 Hz 1 dBmV 42 dB 341 0
4 Locked QAM256 411000000 Hz 1 dBmV 42 dB 297 0
5 Locked QAM256 417000000 Hz 1 dBmV 42 dB 331 0
6 Locked QAM256 423000000 Hz 1 dBmV 42 dB 348 0
7 Locked QAM256 429000000 Hz 1 dBmV 42 dB 339 0
8 Locked QAM256 435000000 Hz 1 dBmV 42 dB 305 0
9 Locked QAM256 453000000 Hz 2 dBmV 42 dB 352 0
10 Locked QAM256 459000000 Hz 2 dBmV 42 dB 694 176
11 Locked QAM256 465000000 Hz 2 dBmV 43 dB 317 0
13 Locked QAM256 477000000 Hz 2 dBmV 34 dB 253 0
14 Locked QAM256 483000000 Hz 2 dBmV 38 dB 233 0
15 Locked QAM256 489000000 Hz 2 dBmV 42 dB 267 0
16 Locked QAM256 495000000 Hz 2 dBmV 42 dB 293 0
17 Locked QAM256 507000000 Hz 2 dBmV 42 dB 281 0
18 Locked QAM256 513000000 Hz 2 dBmV 42 dB 227 0
19 Locked QAM256 519000000 Hz 1 dBmV 42 dB 246 0
20 Locked QAM256 525000000 Hz 2 dBmV 42 dB 294 0
21 Locked QAM256 531000000 Hz 2 dBmV 42 dB 289 0
22 Locked QAM256 537000000 Hz 2 dBmV 42 dB 293 0
23 Locked QAM256 543000000 Hz 2 dBmV 42 dB 301 0
24 Locked QAM256 549000000 Hz 2 dBmV 42 dB 357 0
25 Locked QAM256 555000000 Hz 2 dBmV 41 dB 312 0
26 Locked QAM256 561000000 Hz 2 dBmV 41 dB 270 0
27 Locked QAM256 567000000 Hz 1 dBmV 41 dB 189 0
28 Locked QAM256 573000000 Hz 1 dBmV 40 dB 235 0
29 Locked QAM256 579000000 Hz 1 dBmV 40 dB 254 0
30 Locked QAM256 585000000 Hz 1 dBmV 40 dB 283 0
31 Locked QAM256 591000000 Hz 1 dBmV 41 dB 252 0
32 Locked QAM256 597000000 Hz 1 dBmV 41 dB 216 0
193 Locked OFDM PLC 690000000 Hz 2 dBmV 42 dB 946403991 41

Question

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Updated 

26 days ago

 • Edited

34

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Accepted Solution

Dicx

Contributor

 • 

19 Messages

26 days ago

Just some closure,

1. Cut cables I could and re-terminated the ends.

2. New modem (S34)

3. New router, TP Link BE 550 Pro

4. Cat6 wire (full copper) and plugs, 2.5G ethernet ports.

0

0

EG

Expert

 • 

112.9K Messages

3 months ago

The downstream power is fine. I would guess that it is a modem bootfile / speed provisioning issue. It gets re-downloaded to the modem after it powers back up from a power outage. Sometimes it's not successful. First, try power cycling the modem to pull a fresh configuration and see.

If not, I'll escalate your issue to the Comcast corporate employees (The Digital Care Team) who are available to these boards. They will be able to check that for you. Good luck !

(edited)

0

XfinityJon

Official Employee

 • 

452 Messages

3 months ago

Hey there Dicx. We certainly appreciate the information and are more than happy to help with your concern. What troubleshooting steps have you taken so far? Are you experiencing slower speeds on multiple devices, or any device in particular?

 

0

0

EG

Expert

 • 

112.9K Messages

3 months ago

@Dicx 

Have you had a chance to try that power cycle operation ?

5

0

Dicx

Contributor

 • 

19 Messages

Went up 1DB to 3 

Procedure Status Comment
Acquire Downstream Channel 471000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
12 Locked QAM256 471000000 Hz 2 dBmV 43 dB 0 0
1 Locked QAM256 393000000 Hz 0 dBmV 41 dB 0 0
2 Locked QAM256 399000000 Hz 1 dBmV 42 dB 0 0
3 Locked QAM256 405000000 Hz 1 dBmV 42 dB 0 0
4 Locked QAM256 411000000 Hz 1 dBmV 42 dB 0 0
5 Locked QAM256 417000000 Hz 2 dBmV 42 dB 0 0
6 Locked QAM256 423000000 Hz 2 dBmV 42 dB 0 0
7 Locked QAM256 429000000 Hz 2 dBmV 42 dB 0 0
8 Locked QAM256 435000000 Hz 2 dBmV 42 dB 0 0
9 Locked QAM256 453000000 Hz 2 dBmV 42 dB 0 0
10 Locked QAM256 459000000 Hz 2 dBmV 42 dB 0 0
11 Locked QAM256 465000000 Hz 2 dBmV 43 dB 0 0
13 Locked QAM256 477000000 Hz 2 dBmV 32 dB 0 0
14 Locked QAM256 483000000 Hz 2 dBmV 40 dB 0 0
15 Locked QAM256 489000000 Hz 2 dBmV 43 dB 0 0
16 Locked QAM256 495000000 Hz 2 dBmV 42 dB 0 0
17 Locked QAM256 507000000 Hz 2 dBmV 42 dB 0 0
18 Locked QAM256 513000000 Hz 2 dBmV 42 dB 0 0
19 Locked QAM256 519000000 Hz 2 dBmV 42 dB 0 0
20 Locked QAM256 525000000 Hz 2 dBmV 42 dB 0 0
21 Locked QAM256 531000000 Hz 2 dBmV 42 dB 0 0
22 Locked QAM256 537000000 Hz 2 dBmV 42 dB 0 0
23 Locked QAM256 543000000 Hz 2 dBmV 42 dB 0 0
24 Locked QAM256 549000000 Hz 2 dBmV 42 dB 0 0
25 Locked QAM256 555000000 Hz 2 dBmV 41 dB 0 0
26 Locked QAM256 561000000 Hz 2 dBmV 41 dB 0 0
27 Locked QAM256 567000000 Hz 2 dBmV 41 dB 0 0
28 Locked QAM256 573000000 Hz 2 dBmV 40 dB 0 0
29 Locked QAM256 579000000 Hz 2 dBmV 40 dB 0 0
30 Locked QAM256 585000000 Hz 1 dBmV 41 dB 0 0
31 Locked QAM256 591000000 Hz 1 dBmV 41 dB 0 0
32 Locked QAM256 597000000 Hz 1 dBmV 41 dB 0 0
193 Locked OFDM PLC 690000000 Hz 3 dBmV 42 dB 2949510 0


Upstream Bonded Channels
Channel ID Lock Status US Channel Type Frequency Width Power
1 Locked SC-QAM 16400000 Hz 6400000 44.8 dBmV
2 Locked SC-QAM 22800000 Hz 6400000 48.5 dBmV
3 Locked SC-QAM 29200000 Hz 6400000 48.5 dBmV
4 Locked SC-QAM 35600000 Hz 6400000 47.0 dBmV
5 Locked SC-QAM 40400000 Hz 3200000 45.5 dBmV
Standard Specification Compliant DOCSIS 3.1
Hardware Version V1.0
Software Version TB01.03.001.10_012022_212.S3

3 months ago

0

XfinityJon

Official Employee

 • 

452 Messages

Good afternoon. I am happy to assist you further with your connection issues. In order for us to troubleshoot more specifically, I will need some additional information from you. 

Please send us a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forums page.

 

To send a "Direct Message" to Xfinity Support:

 

Click "Sign In" if necessary

Click the "Direct Messaging" icon or  https://forums.xfinity.com/direct-messaging

Click the "New message" (pencil and paper) icon
The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there

As you are typing a drop-down list appears. Select "Xfinity Support" from that list

An "Xfinity Support" graphic replaces the "To:" line

Type your message in the text area near the bottom of the window and press Enter to send it.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 months ago

0

Dicx

Contributor

 • 

19 Messages

Latest speedtest from xfinity was 264.3 on a

Gigabit Extra Plan

Download speeds: up to 1300 Mbps

Upload speeds: up to 35 Mbps

Upload speed is 40Mbps, so just affecting download. I don't see any stutter when playing back video so maybe I am just having a "not as advertised" issue and it's just me. Before the power outage speed tests were 700-1000 and power levels were 7-9

3 months ago

0

XfinityJon

Official Employee

 • 

452 Messages

Understood, I am definitely happy to troubleshoot this for you, to see what we can do. I did send the prompt for a direct message, if you are able to provide the additional information by direct message, I can pull up your account and troubleshoot with you. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 months ago

0

EG

Expert

 • 

112.9K Messages

@XfinityJon 

Please check their boot file and backend data. Thank you !

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? Please mark an Accepted Answer!tick

3 months ago

EG

Expert

 • 

112.9K Messages

3 months ago

Ok, but what about the speeds ? The power cycle operation suggestion was to force the modem to redownload a fresh bootfile / speed configuration file, not to change the power levels. They are ok, as was stated.

1

Dicx

Contributor

 • 

19 Messages

From speedtest.net

Download Mbps 312.69
Upload Mbps 38.99
Fast.com - 210
Xfinity speed test - 353.9
So a lot slower than usual. 

(edited)

3 months ago

0

Dicx

Contributor

 • 

19 Messages

3 months ago

Sent direct message. thanks.

2

0

XfinityEmilyB

Official Employee

 • 

2.3K Messages

 

Dicx Perfect, I'm keeping an eye on any incoming DMs from you so we can troubleshoot together until we confirm this is resolved. Thank you @EG for jumping in with your expert insight :). Your help is always appreciated! 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 months ago

Dicx

Contributor

 • 

19 Messages

Sent to support, didn't see your handle. Thanks!

3 months ago

0

EG

Expert

 • 

112.9K Messages

3 months ago

It's my pleasure @XfinityEmilyB ! 

0

0

EG

Expert

 • 

112.9K Messages

26 days ago

Thanks for the update ! Looks good ! Hope it holds up for you ! Best of luck ! Now closing your marked "Solved" topic.

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