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jnowakphoto
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22 Messages

Monday, March 23rd, 2020 6:00 PM

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Slow internet. Modem status attached

Hello. Have had Comcast 300Mbs internet for a while now. Have noticed slow loading videos etc whcih led me to investigate through speed test. Mind you this is on a wired connection directly to modem (ARRIS SB6190) bypassing router and effectively taking that out of the equation.  Sometimes I get 300Mbs down, next second I get 2Mbps down, Then 40Mbs down etc. Not consistent. I notcied the below in the modem status page. Please advise.

 

Cannel 22 Not Locked  and Channel 21 showing really high in the Corected and Uncorrectables

 

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

 

 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked 256QAM 27 681.00 MHz 0.40 dBmV 38.98 dB 0 0
2 Locked 256QAM 1 525.00 MHz 0.20 dBmV 31.92 dB 257 0
3 Locked 256QAM 2 531.00 MHz -0.30 dBmV 33.96 dB 0 0
4 Locked 256QAM 3 537.00 MHz -0.10 dBmV 37.36 dB 15 0
5 Locked 256QAM 4 543.00 MHz 0.00 dBmV 38.61 dB 0 0
6 Locked 256QAM 5 549.00 MHz -0.10 dBmV 40.37 dB 0 0
7 Locked 256QAM 6 555.00 MHz -0.10 dBmV 40.37 dB 0 0
8 Locked 256QAM 7 561.00 MHz -0.30 dBmV 40.37 dB 0 0
9 Locked 256QAM 8 567.00 MHz -0.30 dBmV 40.95 dB 0 0
10 Locked 256QAM 9 573.00 MHz -0.30 dBmV 40.37 dB 0 0
11 Locked 256QAM 10 579.00 MHz -0.50 dBmV 38.98 dB 0 0
12 Locked 256QAM 11 585.00 MHz -0.50 dBmV 36.61 dB 0 0
13 Locked 256QAM 12 591.00 MHz -0.50 dBmV 36.61 dB 0 0
14 Locked 256QAM 13 597.00 MHz -0.50 dBmV 36.39 dB 0 0
15 Locked 256QAM 14 603.00 MHz -0.70 dBmV 38.61 dB 0 0
16 Locked 256QAM 15 609.00 MHz -0.30 dBmV 40.37 dB 0 0
17 Locked 256QAM 16 615.00 MHz -0.20 dBmV 40.37 dB 0 0
18 Locked 256QAM 17 621.00 MHz -0.20 dBmV 40.37 dB 0 0
19 Locked 256QAM 18 627.00 MHz -0.10 dBmV 38.98 dB 0 0
20 Locked 256QAM 19 633.00 MHz -0.20 dBmV 38.98 dB 11 0
21 Locked 256QAM 20 639.00 MHz 0.00 dBmV 31.14 dB 1142720 2444509
22 Not Locked ---- 21 645.00 MHz ---- ---- ---- ----
23 Locked 256QAM 22 651.00 MHz 0.30 dBmV 40.37 dB 0 0
24 Locked 256QAM 23 657.00 MHz 0.30 dBmV 38.98 dB 0 0
25 Locked 256QAM 24 663.00 MHz 0.20 dBmV 39.50 dB 0 0
26 Locked 256QAM 25 669.00 MHz 0.30 dBmV 39.50 dB 0 0
27 Locked 256QAM 26 675.00 MHz 0.00 dBmV 39.50 dB 0 0
28 Locked 256QAM 28 687.00 MHz 0.30 dBmV 39.50 dB 0 0
29 Locked 256QAM 29 693.00 MHz 0.60 dBmV 39.50 dB 0 0
30 Locked 256QAM 30 699.00 MHz 0.80 dBmV 39.90 dB 0 0
31 Locked 256QAM 31 705.00 MHz 0.80 dBmV 39.90 dB 0 0
32 Locked 256QAM 32 711.00 MHz 0.90 dBmV 39.50 dB 3 0

 

 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 4 5120 kSym/s 16.60 MHz 39.00 dBmV
2 Locked ATDMA 3 5120 kSym/s 23.00 MHz 37.75 dBmV
3 Locked ATDMA 2 5120 kSym/s 29.40 MHz 37.00 dBmV
4 Locked ATDMA 1 5120 kSym/s 35.80 MHz 35.75 dBmV

 

 

 

and Event Log showing Lost MDD and RCS Partial Service

 

Time Priority Description
Mon Mar 23 20:07:13 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:13 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:27 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:27 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:29 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:30 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:07:58 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:08:00 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:08:40 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:08:41 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:09:11 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:09:11 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:09:23 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:09:24 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:03 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:04 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:11 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:12 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:26 2020 5 Lost MDD Timeout;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;
Mon Mar 23 20:10:26 2020 5 RCS Partial Service;CM-MAC=5c:e3:0e:3a:51:41;CMTS-MAC=00:01:5c:ac:12:79;CM-QOS=1.1;CM-VER=3.0;

Question

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4 years ago

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EG

Expert

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103.5K Messages

4 years ago

The SNR is out of spec on channel 21, and channel 22 may not be locking because there is noise ingressing into the line(s) somewhere at those two frequencies. Those two channels are right next to each other.

 

For starters, try power-cycling the 6190 modem and see if it will lock on to a different / perhaps cleaner set of downstream channels.

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jnowakphoto

Frequent Visitor

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22 Messages

4 years ago

Hello. Yeah I’ve disconnected and even factory reset the modem. Getting same result. Could this indicate a faulty SB6190 or does it point to a line issue? Thoughts?

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jnowakphoto

Frequent Visitor

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22 Messages

4 years ago

Also. Got new modem (SB8200)

 

Channel 2, 20 and 21 show some high numbers again. Thoughts? 

 

Here are the status logs:

 

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 711000000 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
32 Locked QAM256 711000000 Hz -3.8 dBmV 41.8 dB 0 0
2 Locked QAM256 531000000 Hz -3.3 dBmV 0.0 dB 58506522 35997665
3 Locked QAM256 537000000 Hz -3.2 dBmV 34.9 dB 0 0
4 Locked QAM256 543000000 Hz -3.1 dBmV 40.9 dB 0 0
5 Locked QAM256 549000000 Hz -3.4 dBmV 42.1 dB 0 0
6 Locked QAM256 555000000 Hz -3.5 dBmV 42.3 dB 0 0
7 Locked QAM256 561000000 Hz -3.6 dBmV 42.3 dB 0 0
8 Locked QAM256 567000000 Hz -3.8 dBmV 42.2 dB 0 0
9 Locked QAM256 573000000 Hz -3.8 dBmV 42.2 dB 0 0
10 Locked QAM256 579000000 Hz -4.2 dBmV 41.9 dB 0 0
11 Locked QAM256 585000000 Hz -4.2 dBmV 38.5 dB 0 0
12 Locked QAM256 591000000 Hz -4.2 dBmV 37.1 dB 0 0
13 Locked QAM256 597000000 Hz -4.3 dBmV 35.8 dB 0 0
14 Locked QAM256 603000000 Hz -4.3 dBmV 38.0 dB 0 0
15 Locked QAM256 609000000 Hz -4.3 dBmV 41.7 dB 0 0
16 Locked QAM256 615000000 Hz -4.1 dBmV 41.8 dB 0 0
17 Locked QAM256 621000000 Hz -4.0 dBmV 41.7 dB 0 0
18 Locked QAM256 627000000 Hz -4.2 dBmV 41.5 dB 0 0
19 Locked QAM256 633000000 Hz -4.2 dBmV 41.5 dB 0 0
20 Locked QAM256 639000000 Hz -4.2 dBmV 0.0 dB 6150518 1361238
21 Not Locked Unknown 645000000 Hz -3.9 dBmV 0.0 dB 64894087 29167922
22 Locked QAM256 651000000 Hz -3.6 dBmV 34.1 dB 0 0
23 Locked QAM256 657000000 Hz -3.7 dBmV 41.5 dB 0 0
24 Locked QAM256 663000000 Hz -3.7 dBmV 41.5 dB 0 0
25 Locked QAM256 669000000 Hz -3.9 dBmV 41.5 dB 0 0
26 Locked QAM256 675000000 Hz -4.2 dBmV 40.1 dB 0 0
27 Locked QAM256 681000000 Hz -4.2 dBmV 41.5 dB 0 0
28 Locked QAM256 687000000 Hz -4.3 dBmV 41.5 dB 0 0
29 Locked QAM256 693000000 Hz -4.3 dBmV 41.6 dB 0 0
30 Locked QAM256 699000000 Hz -3.9 dBmV 41.8 dB 0 0
31 Locked QAM256 705000000 Hz -3.8 dBmV 41.8 dB 0 0
37 Locked Other 762000000 Hz -4.6 dBmV 27.8 dB 413574250 3563794



 
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 1 Locked SC-QAM Upstream 35800000 Hz 6400000 Hz 36.0 dBmV
2 2 Locked SC-QAM Upstream 29400000 Hz 6400000 Hz 37.0 dBmV
3 3 Locked SC-QAM Upstream 23000000 Hz 6400000 Hz 37.0 dBmV
4 4 Locked SC-QAM Upstream 16600000 Hz 6400000 Hz 38.0 dBmV



 

Current System Time: Wed Mar 25 08:55:49 2020


 
 

 

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jnowakphoto

Frequent Visitor

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22 Messages

4 years ago

As of today. Looks like it's getting worse. On a brand new modem mind you....

 

ANy ideas anyone?

 

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
32 Locked QAM256 711000000 Hz -3.4 dBmV 41.2 dB 741 232
2 Locked QAM256 531000000 Hz -2.7 dBmV 33.5 dB 79795630 65079038
3 Locked QAM256 537000000 Hz -2.5 dBmV 38.9 dB 1856 561
4 Locked QAM256 543000000 Hz -2.5 dBmV 41.2 dB 1340 411
5 Locked QAM256 549000000 Hz -2.8 dBmV 41.7 dB 1106 414
6 Locked QAM256 555000000 Hz -3.0 dBmV 41.8 dB 1125 398
7 Locked QAM256 561000000 Hz -3.1 dBmV 41.8 dB 1066 353
8 Locked QAM256 567000000 Hz -3.3 dBmV 41.7 dB 1093 304
9 Locked QAM256 573000000 Hz -3.5 dBmV 41.6 dB 1028 351
10 Locked QAM256 579000000 Hz -3.8 dBmV 41.3 dB 1079 333
11 Locked QAM256 585000000 Hz -3.8 dBmV 40.0 dB 1301 285
12 Locked QAM256 591000000 Hz -3.8 dBmV 38.8 dB 1238 439
13 Locked QAM256 597000000 Hz -3.9 dBmV 36.2 dB 1063 271
14 Locked QAM256 603000000 Hz -3.9 dBmV 40.5 dB 1030 332
15 Locked QAM256 609000000 Hz -4.0 dBmV 41.0 dB 1009 286
16 Locked QAM256 615000000 Hz -3.8 dBmV 41.1 dB 878 292
17 Locked QAM256 621000000 Hz -3.7 dBmV 41.2 dB 982 260
18 Locked QAM256 627000000 Hz -3.8 dBmV 40.9 dB 1255 291
19 Locked QAM256 633000000 Hz -3.8 dBmV 39.8 dB 2275 292
20 Locked QAM256 639000000 Hz -3.8 dBmV 28.9 dB 204237387 138895598
21 Locked QAM256 645000000 Hz -3.5 dBmV 0.0 dB 360564439 474298390
22 Locked QAM256 651000000 Hz -3.3 dBmV 33.2 dB 34476656 1214526
23 Locked QAM256 657000000 Hz -3.5 dBmV 40.8 dB 823 252
24 Locked QAM256 663000000 Hz -3.6 dBmV 40.7 dB 721 286
25 Locked QAM256 669000000 Hz -3.8 dBmV 40.7 dB 834 223
26 Locked QAM256 675000000 Hz -4.0 dBmV 39.9 dB 825 275
27 Locked QAM256 681000000 Hz -4.0 dBmV 40.8 dB 769 210
28 Locked QAM256 687000000 Hz -3.8 dBmV 40.7 dB 835 206
29 Locked QAM256 693000000 Hz -3.7 dBmV 41.0 dB 730 261
30 Locked QAM256 699000000 Hz -3.4 dBmV 41.2 dB 2260 2249
31 Locked QAM256 705000000 Hz -3.3 dBmV 41.0 dB 3069 3952
37 Locked Other 762000000 Hz -4.7 dBmV 29.5 dB 3322658559 25446529


 

 
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 1 Locked SC-QAM Upstream 35800000 Hz 6400000 Hz 34.0 dBmV
2 2 Locked SC-QAM Upstream 29400000 Hz 6400000 Hz 35.0 dBmV
3 3 Locked SC-QAM Upstream 23000000 Hz 6400000 Hz 36.0 dBmV
4 4 Locked SC-QAM Upstream 16600000 Hz 6400000 Hz 36.0 dBmV

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EG

Expert

 • 

103.5K Messages

4 years ago

Get a tech out to investigate. Good luck !

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jnowakphoto

Frequent Visitor

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22 Messages

4 years ago

Do The above numbers indicate a line issue? If so which numbers? The uncorrectables or perhaps the power or SNR values? In other words what do I wanna tell Comcast?

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EG

Expert

 • 

103.5K Messages

4 years ago

In the second paste, the SNR's on channels 20, 21, and 22 are too low / out of spec. Noise is leaking into the line(s) somewhere at those channel frequencies.

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