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user_2a038e
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2 Messages

Friday, January 21st, 2022 10:17 PM

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New MB8611 - lots of Corrected and Uncorrected errors

Hi all,

I just installed a new MB8611 modem and i'm seeing lots of Corrected and Uncorrected errors, any suggestions?

I have the 300/10 plan and i'm only seeing low to mid 100s of download speed.

Thank you in advance!

Startup Sequence    
   Startup Step Status Comment

  
   Acquire Downstream Channel 633000000 Hz Locked
  
   Upstream Connection OK Operational
  
   Boot State OK Operational

  
   Configuration File OK
  
   Security Enabled BPI+
  


   Connection Status    
   System Up Time 0 days 04h:19m:42s  
  
   Network Access Allowed  
  


   Downstream Bonded Channels  
  
   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 32 633.0 0.7 38.7 160294 179223
   2 Locked QAM256 17 543.0 2.2 43.8 0 0
   3 Locked QAM256 18 549.0 2.2 39.9 0 0
   4 Locked QAM256 19 555.0 2.4 31.0 9787541 1209176
   5 Locked QAM256 20 561.0 2.4 30.7 24505377 34706849
   6 Locked QAM256 21 567.0 2.1 40.5 0 0
   7 Locked QAM256 22 573.0 1.8 42.4 0 0
   8 Locked QAM256 23 579.0 1.8 41.3 0 0
   9 Locked QAM256 24 585.0 1.9 40.8 0 0
   10 Locked QAM256 25 591.0 1.9 42.9 0 0
   11 Locked QAM256 26 597.0 1.6 42.5 0 0
   12 Locked QAM256 27 603.0 1.2 42.9 0 0
   13 Locked QAM256 28 609.0 1.0 42.6 0 0
   14 Locked QAM256 29 615.0 1.1 42.9 0 0
   15 Locked QAM256 30 621.0 1.2 40.8 0 0
   16 Locked QAM256 31 627.0 0.9 36.1 36556 771
   17 Locked QAM256 33 639.0 0.6 42.0 0 0
   18 Locked QAM256 34 645.0 0.9 42.6 0 0
   19 Locked QAM256 35 651.0 1.0 42.9 0 0
   20 Locked QAM256 36 657.0 0.8 42.8 0 0
   21 Locked QAM256 37 663.0 0.5 42.6 0 0
   22 Locked QAM256 38 669.0 0.3 42.5 0 0
   23 Locked QAM256 39 675.0 0.5 42.1 130 0
   24 Locked QAM256 40 681.0 0.6 42.6 0 0
   25 Locked QAM256 41 687.0 0.6 42.7 0 0
   26 Locked QAM256 42 693.0 0.4 42.5 0 0
   27 Locked QAM256 43 699.0 0.4 42.5 0 0
   28 Locked QAM256 44 705.0 0.6 42.5 531 557
   29 Locked QAM256 45 711.0 0.6 42.6 5232 3180
   30 Locked QAM256 46 717.0 0.7 42.4 1 0
   31 Locked QAM256 47 723.0 0.2 41.8 0 0
   32 Locked OFDM PLC 48 850.0 -3.1 40.3 159134849 0


   Upstream Bonded Channels  
  
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 1 5120 16.4 38.3
   2 Locked SC-QAM 2 5120 22.8 39.0
   3 Locked SC-QAM 3 5120 29.2 40.0
   4 Locked SC-QAM 4 5120 35.6 40.5

Question

 • 

Updated 

3 years ago

 • Edited

2.9K

3

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user_bb801b

Contributor

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167 Messages

3 years ago

May be worth chatting up Customer Service to see whats going on with signal.

 To understand more about the issue is the device tested speed on directly behind the Gateway? Ethernet or WIFI?

Just my .2 cents.

 
Thanks and good luck.

0

0

XfinityThomasD

Official Employee

 • 

1.2K Messages

3 years ago

Hi, @user_2a038e. I know that speed issues are the worst and we can definitely look further into the signal your modem is reporting, as well as check the lines coming to your home for any known issues. If you are still experiencing trouble, please send us a direct message with your full name and address to get started. 

 

To send a Direct Message:

 

Ensure you are logged in

  • Click the "Direct Messaging" icon or https://comca.st/3H7M0xm
  • 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
  • Press Enter to send it.

0

EG

Expert

 • 

110.3K Messages

3 years ago

@user_2a038e 

There are some downstream channels that have low / out of spec SNR values. It appears that there may be some noise ingress into the line(s) somewhere.

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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