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coxpreferred
New Contributor

Slow Downstream speed that also varies from average to slow frequently

I have Cox Preferred Internet service. My downstream fluctuates frequently, going from 40Mbps to 8Mbps (for example, one such incident). I have tried rebooting the Cable Modem, tried direct connection from Cable Modem to the Computer, still the same situation.

I have SB6141 Cable Modem, have looked at the Logs and Signal tabs, see periodic Critical Message in the Log " No Ranging Response received - T3 time-out". Needless to say, this is frustrating and doesn't get me what I am paying for. I am posting here the Logs and the Signal Strength information. Any help would be appreciated. Thanks

Time

PriorityCodeMessage
Apr 28 2017 13:40:44 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Apr 28 2017 13:40:44 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:24 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Apr 28 2017 13:22:34 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Apr 28 2017 13:22:33 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:29 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1f:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Apr 28 2017 12:01:39 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1c:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Apr 28 2017 12:01:39 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1c:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:21 3-Critical R02.0

No Ranging Response received - T3 time-out;CM-MAC=78:96:84:f9:69:ea;CMTS-MAC=00:1c:ca:1f:ee:b5;CM-QOS=1.1;CM-VER=3.0;

Downstream

Bonding Channel Value
Channel ID 70  69  71  72  65  66  67  68 
Frequency 939000000 Hz  933000000 Hz  945000000 Hz  951000000 Hz  909000000 Hz  915000000 Hz  921000000 Hz  927000000 Hz 
Signal to Noise Ratio 37 dB  37 dB  37 dB  36 dB  37 dB  37 dB  37 dB  37 dB 
Downstream Modulation QAM256  QAM256  QAM256  QAM256  QAM256  QAM256  QAM256  QAM256 
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
6 dBmV   6 dBmV   6 dBmV   6 dBmV   7 dBmV   6 dBmV   6 dBmV   6 dBmV  

Upstream

Bonding Channel Value
Channel ID 1  2  3  4 
Frequency 37104000 Hz  30704000 Hz  23696000 Hz  18896000 Hz 
Ranging Service ID 217  217  217  217 
Symbol Rate 2.560 Msym/sec  5.120 Msym/sec  5.120 Msym/sec  2.560 Msym/sec 
Power Level 40 dBmV  40 dBmV  39 dBmV  38 dBmV 
Upstream Modulation [3] 16QAM
[3] 64QAM
 		 [3] 16QAM
[3] 64QAM
 		 [3] 16QAM
[3] 64QAM
 		 [3] QPSK
[2] 16QAM
[3] 64QAM
 
Ranging Status Success  Success  Success  Success 
connection issues
poor internet connection
poor speed

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  • ChrisL's avatar
    ChrisL
    Former Moderator
    @coxpreferred

    Looking from this end the modem is reporting packet loss when I try to connect to it. Are there any cable splitters you can try bypassing to see if that helps? You can also try testing the modem at at different cable outlet. If neither of those suggestions works it may be necessary for a technician to come troubleshoot further.

  • coxpreferred's avatar
    coxpreferred
    New Contributor

    Thanks. We don't have cable splitters, further we have the Cox Internet service only, so no TV needs either. I remember trying a different outlet previously. We had a service tech. come over, who had to change some cable outside the house. He also did not see any filters.

    I will call back to get a service tech. appt. to look at the situation again. Will update after we get through this step.

    Thanks.