I recently started using a cloud backup service. The initial upload takes weeks, probably, and originally used the full 6MB upload capacity. I started having problems where the internet connection dropped, which were solved by power cycling the modem. The backup service support person suggested dialing back the program to use 1MB upload, and since then the internet connection has not dropped. As I am supposed to get 6MB, this seems like a problem.
The upstream power levels I get are 38–42 dBmV, which is low. (Downstream S/N are 36–37 dB.)
The error log shows messages like this:
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=94:cc:b9:d0:42:8d;CMTS-MAC=00:9e:1e:58:cd:d2;CM-QOS=1.1;CM-VER=3.0;
Seems like there is one of these for each power reset message.
Due to when the 6121 was released it's getting a bit long in the tooth / EOL\EOS potentially as well.
If you can login and grab a snapshot of the power/snr levels from the modem admin page that would be helpful to see if there's a potential line issue or a splitter gone wrong.
Hello cbfiddle. I can assist with troubleshooting your upload performance issues. I'd like to start with performing a diagnostics test against your modem. Please send me a private message and include your full name, service address, and account number so I can access your account.
Comcast should be helping you on the RF issues..
Upstream Rx Power
-0.5 0.0 0.0 0.5
Upstream SNR Ch
34.3 36.5 37.8 37.5
1.5 1.61 1.68 2.44
2 4 4 4
Down FEC Corrected
1.0E-5 1.0E-5 1.0E-5 9.9E-6
Down FEC Uncorrectable
4.3E-7 4.4E-7 4.6E-7 4.4E-7
Up FEC Corrected
1.2E-4 1.2E-4 1.2E-4 1.2E-4
Up FEC Uncorrectable
3.3E-6 3.3E-6 3.3E-6 3.3E-6
Three days ago, a Comcast tech came out and replaced a cable.
The modem worked fine for two days after that, but froze 3 times yesterday. When frozen, even the modem admin page does not respond. I have attached the modem status information.
@cbfiddle, We apologize you are still experiencing issues. Can you please retest today and provide new speed test results? I also responded to your private message.
I also observe that the hangs almost always occur when I am web browsing (and the cloud backup is uploading). Makes me think there is some sort of conflict between the two activities.
Speed test 82.58 / 6.22, second time 80.78/5.94
|Frequency||585000000 Hz||591000000 Hz||597000000 Hz||603000000 Hz|
|Signal to Noise Ratio||37 dB||37 dB||37 dB||37 dB|
|4 dBmV||3 dBmV||4 dBmV||4 dBmV|
|Upstream||Bonding Channel Value|
|Frequency||35700000 Hz||29200000 Hz||22700000 Hz||16200000 Hz|
|Ranging Service ID||13||13||13||13|
|Symbol Rate||5.120 Msym/sec||5.120 Msym/sec||5.120 Msym/sec||5.120 Msym/sec|
|Power Level||34 dBmV||34 dBmV||32 dBmV||31 dBmV|
|Upstream Modulation|| QPSK
|Signal Stats (Codewords)||Bonding Channel Value|
|Total Unerrored Codewords||1087678836||1085704669||1085704848||1085704677|
|Total Correctable Codewords||31||21||19||16|
|Total Uncorrectable Codewords||740||579||548||551|
Hi cbfiddle. I would like to poll out CMTS again for the historical signal plots. Due to our security policy so that I can access your account, please send me a private message and include your full name, service address, and account number so I can assist you.