Motorola MB8600 Issues

Question

I have called Cox a couple times, I have a tech scheduled to come out in 2 days.&nbsp; We have had a lot of service outages over the last 2 weeks.&nbsp;&nbsp;
I have been having issues from around 3-5pm every day for over a month, just disconnects for 3-5 minutes them comes back up.&nbsp; Will do that multiple times a day.
Doesn't seem to be equipment related, but wanted to see what&nbsp;is the latest firmware for the Motorola MB8600?&nbsp; This is what my modem is saying and some error logs below.

Cable Specification Version
DOCSIS 3.1

&nbsp;&nbsp;&nbsp;Hardware Version
V1.0

&nbsp;&nbsp;&nbsp;Software Version
8600-19.3.15

&nbsp;&nbsp;&nbsp;Cable Modem MAC Address
00:40:36:4F:29:26

&nbsp;&nbsp;&nbsp;Cable Modem Serial Number
3348-MB8600-0697

&nbsp;&nbsp;&nbsp;CM Certificate
Installed

&nbsp;&nbsp;&nbsp;
Prod_19.3_d31

20:00:19
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Mon Sep 4 2023

20:00:22
Critical (3)
No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Mon Sep 4 2023

20:00:22
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Mon Sep 4 2023

20:00:28
Critical (3)
No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Mon Sep 4 2023

20:00:28
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Mon Sep 4 2023

Time Not Established
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

Time Not Established
Critical (3)
Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;

Time Not Established
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1

lowtide · Answer

Sure thing, here are&nbsp;

widermouthopen · Answer

The only thing big thing I can think of that has changed in some area is the additional of the upstream OFDMA channel. Did you notice if you got it when you started having these problems? I have a feeling the problem has something to do with the underground(UG) wiring or pedestal. Always seems to be UG wiring when I see T4 errors but I don't know why. The technician should be able to test from the pedestal and see if there is errors/packet loss. If so they will put in a ticket. Be sure to get the ticket number for follow up.

widermouthopen · Answer

Can you post your signal levels? Specially the upstream.

widermouthopen · Answer

2 OFDM and 1 OFDMA so at least you are in a upgraded area. I also see your signal levels are on the high side which Motorola(Zoom) modems don't do well on. Do you happen to be going through a amp? Last, I see uncorrectables in the 117-129Mhz range which may be overlapping with OFDM.
Can you describe how the coaxial gets from the street to room the modem is in?

lowtide · Answer

I should not be going through an AMP, at least to my knowledge.&nbsp;&nbsp;
I don't have cable TV, phone or anything else from Cox, so there should not be splitters.&nbsp; It should be a straight through cable from the box to my modem, maybe one barrel connector in the faceplate.&nbsp;&nbsp;From the street is underground to a box right by my fuse panel and other utilities.&nbsp;
Nothing has changed with cabling for years, but seems to happen more in the afternoon.&nbsp; Like it has done it at least 3 times today already, and it is just 2pm here

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Cable Specification Version	DOCSIS 3.1
Hardware Version	V1.0
Software Version	8600-19.3.15
Cable Modem MAC Address	00:40:36:4F:29:26
Cable Modem Serial Number	3348-MB8600-0697
CM Certificate	Installed
	Prod_19.3_d31

20:00:19	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 4 2023
20:00:22	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 4 2023
20:00:22	Critical (3)	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 4 2023
20:00:28	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 4 2023
20:00:28	Critical (3)	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 4 2023
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=d4:ad:71:0d:b5:5c;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:29:26;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1