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What does this mean? Started Unicast Maintenance Ranging - No Response received

phisifinder
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What does this mean? Started Unicast Maintenance Ranging - No Response received

What does this mean? "Started Unicast Maintenance Ranging - No Response received" 

Comcast wants to prove my problem is my 6 monoth old moden, despite the fact the cable is 30 years old and patched.  

And, the comcast technician gave me a copy of the noise, and said it was the worse she had seen, but comcast can't find that report.  

I had this problem before I bought the new modem - that's why I bought a new modem.  

I need to know WHAT THIS MEANS.  

Support was no help - they send me 3 emails, gave me a case number, but NO WAY to continue the contact.  

 

TimePriorityDescription
2020-06-21, 13:01:00Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:ab:97:c0;CMTS-MAC=00:01:5c:62:ac:6d;CM-QOS=1.1;CM-VER=3.1;
2020-06-21, 00:50:42Warning (5)MDD message timeout;CM-MAC=28:80:88:ab:97:c0;CMTS-MAC=00:01:5c:62:ac:6d;CM-QOS=1.1;CM-VER=3.1;
2020-06-20, 14:30:11Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:ab:97:c0;CMTS-MAC=00:01:5c:62:ac:6d;CM-QOS=1.1;CM-VER=3.1;
Model: C7800|Nighthawk X4S-AC3200 WiFi Cable Modem Router
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