Frequent Visitor
•
9 Messages
SB8200 Modem Speed Issues
Hello,
I’ve been experiencing some major speed limitations on my home network in recent weeks. I have the gigabit plan (up to 1,200mb/s) but I’m having a problem maintaining high speeds. I noticed pages and streaming services not loading a few weeks ago. I started speed testing. I found that I was only getting speeds around 10-15mb/s down and like 1-2mb/s up.
I power cycled the modem. As soon as it booted up speeds seemed ok for a second, but then after a little while speeds went right back into the toilet. This has been the pattern for a few weeks now. I reboot and it’s fine for a few minutes, the slows down to nothing again. I just collected the status report from the modem. Can someone knowledgeable here please take a look and let me know what you think? I’m not sure how to read these charts.
Thanks.
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 525000000 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
13 Locked QAM256 525000000 Hz 2.1 dBmV 42.8 dB 0 0
1 Locked QAM256 447000000 Hz 3.0 dBmV 44.0 dB 0 0
2 Locked QAM256 453000000 Hz 1.5 dBmV 43.1 dB 0 0
3 Locked QAM256 459000000 Hz 2.2 dBmV 43.5 dB 0 0
4 Locked QAM256 465000000 Hz 2.3 dBmV 43.2 dB 0 0
5 Locked QAM256 471000000 Hz 2.6 dBmV 43.3 dB 0 0
6 Locked QAM256 477000000 Hz 1.5 dBmV 42.7 dB 0 0
7 Locked QAM256 483000000 Hz 1.8 dBmV 42.7 dB 0 0
8 Locked QAM256 489000000 Hz 2.9 dBmV 43.4 dB 0 0
9 Locked QAM256 495000000 Hz 3.5 dBmV 43.7 dB 0 0
10 Locked QAM256 507000000 Hz 2.9 dBmV 43.3 dB 0 0
11 Locked QAM256 513000000 Hz 3.3 dBmV 43.2 dB 0 0
12 Locked QAM256 519000000 Hz 3.5 dBmV 43.2 dB 0 0
14 Locked QAM256 531000000 Hz 3.2 dBmV 42.7 dB 0 0
15 Locked QAM256 537000000 Hz 3.2 dBmV 43.0 dB 0 0
16 Locked QAM256 543000000 Hz 3.5 dBmV 43.0 dB 0 0
17 Locked QAM256 549000000 Hz 1.9 dBmV 42.6 dB 0 0
18 Locked QAM256 555000000 Hz 2.3 dBmV 42.7 dB 0 0
19 Locked QAM256 561000000 Hz 1.7 dBmV 42.3 dB 0 0
20 Locked QAM256 567000000 Hz 1.3 dBmV 42.0 dB 0 0
21 Locked QAM256 573000000 Hz -0.4 dBmV 41.1 dB 0 0
22 Locked QAM256 579000000 Hz 0.6 dBmV 41.5 dB 0 0
23 Locked QAM256 585000000 Hz 1.0 dBmV 41.7 dB 0 0
24 Locked QAM256 591000000 Hz 0.7 dBmV 41.8 dB 0 0
25 Locked Other 693000000 Hz -0.3 dBmV 38.2 dB 657236805 5
26 Not Locked QAM256 0 Hz 0.0 dBmV 41.8 dB 0 0
27 Locked QAM256 597000000 Hz 0.3 dBmV 42.1 dB 0 0
28 Locked QAM256 603000000 Hz 1.2 dBmV 42.0 dB 0 0
29 Locked QAM256 609000000 Hz 1.2 dBmV 41.6 dB 0 0
30 Locked QAM256 615000000 Hz 0.6 dBmV 41.4 dB 0 0
31 Locked QAM256 621000000 Hz 1.1 dBmV 41.5 dB 0 0
32 Locked QAM256 627000000 Hz 1.8 dBmV 41.7 dB 0 0
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 5 Locked SC-QAM Upstream 36500000 Hz 6400000 Hz 41.0 dBmV
2 6 Locked SC-QAM Upstream 30100000 Hz 6400000 Hz 41.0 dBmV
3 7 Locked SC-QAM Upstream 23700000 Hz 6400000 Hz 41.0 dBmV
4 8 Locked SC-QAM Upstream 17300000 Hz 6400000 Hz 40.0 dBmV
I’ve been experiencing some major speed limitations on my home network in recent weeks. I have the gigabit plan (up to 1,200mb/s) but I’m having a problem maintaining high speeds. I noticed pages and streaming services not loading a few weeks ago. I started speed testing. I found that I was only getting speeds around 10-15mb/s down and like 1-2mb/s up.
I power cycled the modem. As soon as it booted up speeds seemed ok for a second, but then after a little while speeds went right back into the toilet. This has been the pattern for a few weeks now. I reboot and it’s fine for a few minutes, the slows down to nothing again. I just collected the status report from the modem. Can someone knowledgeable here please take a look and let me know what you think? I’m not sure how to read these charts.
Thanks.
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 525000000 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
13 Locked QAM256 525000000 Hz 2.1 dBmV 42.8 dB 0 0
1 Locked QAM256 447000000 Hz 3.0 dBmV 44.0 dB 0 0
2 Locked QAM256 453000000 Hz 1.5 dBmV 43.1 dB 0 0
3 Locked QAM256 459000000 Hz 2.2 dBmV 43.5 dB 0 0
4 Locked QAM256 465000000 Hz 2.3 dBmV 43.2 dB 0 0
5 Locked QAM256 471000000 Hz 2.6 dBmV 43.3 dB 0 0
6 Locked QAM256 477000000 Hz 1.5 dBmV 42.7 dB 0 0
7 Locked QAM256 483000000 Hz 1.8 dBmV 42.7 dB 0 0
8 Locked QAM256 489000000 Hz 2.9 dBmV 43.4 dB 0 0
9 Locked QAM256 495000000 Hz 3.5 dBmV 43.7 dB 0 0
10 Locked QAM256 507000000 Hz 2.9 dBmV 43.3 dB 0 0
11 Locked QAM256 513000000 Hz 3.3 dBmV 43.2 dB 0 0
12 Locked QAM256 519000000 Hz 3.5 dBmV 43.2 dB 0 0
14 Locked QAM256 531000000 Hz 3.2 dBmV 42.7 dB 0 0
15 Locked QAM256 537000000 Hz 3.2 dBmV 43.0 dB 0 0
16 Locked QAM256 543000000 Hz 3.5 dBmV 43.0 dB 0 0
17 Locked QAM256 549000000 Hz 1.9 dBmV 42.6 dB 0 0
18 Locked QAM256 555000000 Hz 2.3 dBmV 42.7 dB 0 0
19 Locked QAM256 561000000 Hz 1.7 dBmV 42.3 dB 0 0
20 Locked QAM256 567000000 Hz 1.3 dBmV 42.0 dB 0 0
21 Locked QAM256 573000000 Hz -0.4 dBmV 41.1 dB 0 0
22 Locked QAM256 579000000 Hz 0.6 dBmV 41.5 dB 0 0
23 Locked QAM256 585000000 Hz 1.0 dBmV 41.7 dB 0 0
24 Locked QAM256 591000000 Hz 0.7 dBmV 41.8 dB 0 0
25 Locked Other 693000000 Hz -0.3 dBmV 38.2 dB 657236805 5
26 Not Locked QAM256 0 Hz 0.0 dBmV 41.8 dB 0 0
27 Locked QAM256 597000000 Hz 0.3 dBmV 42.1 dB 0 0
28 Locked QAM256 603000000 Hz 1.2 dBmV 42.0 dB 0 0
29 Locked QAM256 609000000 Hz 1.2 dBmV 41.6 dB 0 0
30 Locked QAM256 615000000 Hz 0.6 dBmV 41.4 dB 0 0
31 Locked QAM256 621000000 Hz 1.1 dBmV 41.5 dB 0 0
32 Locked QAM256 627000000 Hz 1.8 dBmV 41.7 dB 0 0
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 5 Locked SC-QAM Upstream 36500000 Hz 6400000 Hz 41.0 dBmV
2 6 Locked SC-QAM Upstream 30100000 Hz 6400000 Hz 41.0 dBmV
3 7 Locked SC-QAM Upstream 23700000 Hz 6400000 Hz 41.0 dBmV
4 8 Locked SC-QAM Upstream 17300000 Hz 6400000 Hz 40.0 dBmV
EG
Expert
•
117.1K Messages
5 years ago
The stats are fine. Please also post the modem's error log entries in their entirety.
What is the exact make and model number of the modem ?
Is this a WiFi connection ?
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
The table below contains the log of events that the SB8200 has detected. This log can be important to the service provider to help diagnose and correct problems, if any should occur.
Date Time Event ID Event Level Description
03/01/2021 21:47 67061600 6 "DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
03/01/2021 21:47 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
03/01/2021 21:47 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 2436694066 6 "Honoring MDD; IP provisioning mode = IPv6"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/27/2021 22:40 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/27/2021 22:40 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/26/2021 00:44 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/26/2021 00:44 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 01:39 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 01:39 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 01:14 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 01:14 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 00:40 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/25/2021 00:40 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/24/2021 23:54 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/24/2021 23:54 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/02/2021 12:07 84000500 3 "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/02/2021 12:07 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
02/02/2021 12:07 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 01:11 82000500 3 "Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 01:11 68001102 3 "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 01:11 73040200 3 "TLV-11 - Illegal Set operation failed;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:08 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:04 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:04 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 82000400 3 "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 82000400 3 "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 82000400 3 "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:12 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:11 82000400 3 "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:11 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
01/28/2021 00:09 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a9:51;CMTS-MAC=00:01:5c:81:f6:62;CM-QOS=1.1;CM-VER=3.1;"
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
Thanks for reaching out. I just sent you a private message.
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
I thought it may be time for an upgrade suspecting the modem was failing as this one is 2+ years old now (since I signed up for Xfinity when I moved in). I impulse bought a new arris S33 which is going to be delivered Thursday. At least I’ll have that as a backup for testing and potentially solving the issue if it’s not a line connection problem once they evaluate the situation further.
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
0
EG
Expert
•
117.1K Messages
5 years ago
Thank you for responding so rapidly @ComcastVianney !
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
I just did a speed test from two different computers from WiFi and then hardwired and was at roughly 350ms ping which seems very high from what I’m used to seeing and 3mb/s down and 16mb/s up. I also noticed the ping number jumping around for at least two seconds before the test started. It was way longer than 350ms before it actually settled on that number.
I power cycled the modem and went down to 16ms ping with 550mb/s down and 41mb/s up. This happens every time but it doesn’t last.
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
Interestingly when experimenting I noticed that sometimes just plugging in a device to one of the lan ports on the router will cause the speed to return closer to normal for a few minutes while It’s plugged in even on WiFi without rebooting the modem. This also does not last however, before I know it streams stop and pages won’t load again.
What does that error log say to you?
0
0
EG
Expert
•
117.1K Messages
5 years ago
My pleasure ! O/k so even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment somewhere.
There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.
You should get a reply here in your topic. Good luck !
0
XfinityVianney
Official Employee
•
2.6K Messages
5 years ago
Hello, @9V7W3. I am ready to dive right in and help provide any additional assistance you need. Thank you for escalating this further @EG. I will take the information discussed in this thread, and do everything I can to help. When you are ready @9V7W3, please send me a private message including your first and last name. To send me a Private Message, please click my name “ComcastVianney” and click “Send a message." I will await your reply.
0
EG
Expert
•
117.1K Messages
5 years ago
FWIW, that channel number marked as (Other) is the DOCSIS 3.1 / OFDM channel. There is a known glitch with some makes / models of modem's firmware where the measuring mechanism incorrectly reads the power level, the SNR, and the bit errors for that channel. So it reads many errors when there really aren't.
And as far as channel number 26 showing as being "not locked", many, if not most local systems have gone down from using 32 QAM 256 DOCSIS 3.0 downstream channels to now using only 31 since the implementation of the DOCSIS 3.1 / OFDM channel. So that would seem to be normal as well.
The error log entries however, appear to be troublesome.
Please also answer my question about whether or not this is a WiFi connection ?
0
0
9V7W3
Frequent Visitor
•
9 Messages
5 years ago
0
EG
Expert
•
117.1K Messages
5 years ago
Awwww shucks 😊. Thank you for the vote of confidence ! It's why I lurk !!!
0
user_859afe
Visitor
•
1 Message
5 years ago
@9V7W3 , I’m having a very similar issue. Same log errors and symptoms. Was there a resolution to your problem?
1
0