Internet Routinely Cuts Out, Upstream and Downstream LEDs switch to amber

I moved about two months ago, and got set up with comcast. Since then, my modem seems to cut out multiple times a day. It doesn't fully reboot, it doesn't seem to lose power or anything, just th...

Troubleshooting

DarrenM

Sr. NETGEAR Moderator

Mar 17, 2017

Hello creepsalsa

Are you able to get to the log page to post them?

DarrenM

Retired_Member

Mar 19, 2017

Procedure	Status	Comment
Acquire Downstream Channel	657000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	21	657000000 Hz	2.8 dBmV	38.2 dB	106	204
2	Locked	QAM256	9	585000000 Hz	5.1 dBmV	39.6 dB	0	0
3	Locked	QAM256	10	591000000 Hz	5.1 dBmV	39.6 dB	0	0
4	Locked	QAM256	11	597000000 Hz	5.6 dBmV	39.9 dB	0	0
5	Locked	QAM256	12	603000000 Hz	4.7 dBmV	39.4 dB	0	0
6	Locked	QAM256	13	609000000 Hz	4.2 dBmV	39.1 dB	0	0
7	Locked	QAM256	14	615000000 Hz	4.8 dBmV	39.4 dB	0	0
8	Locked	QAM256	15	621000000 Hz	4.5 dBmV	39.3 dB	0	0
9	Locked	QAM256	16	627000000 Hz	4.1 dBmV	39.1 dB	0	0
10	Locked	QAM256	17	633000000 Hz	4 dBmV	39 dB	0	0
11	Locked	QAM256	18	639000000 Hz	3.7 dBmV	38.7 dB	0	0
12	Locked	QAM256	19	645000000 Hz	3.7 dBmV	38.8 dB	0	0
13	Locked	QAM256	20	651000000 Hz	3.6 dBmV	38.7 dB	0	0
14	Locked	QAM256	22	663000000 Hz	3.1 dBmV	38.3 dB	0	0
15	Locked	QAM256	23	669000000 Hz	3.7 dBmV	38.7 dB	0	0
16	Locked	QAM256	24	675000000 Hz	2.9 dBmV	37.1 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120 Ksym/sec	35700000 Hz	39 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	29200000 Hz	39 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	22700000 Hz	38.4 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	16200000 Hz	36.7 dBmV

Here's the levels. Some of the logs events I see on a regular basis:

Warning (5)

Dynamic Range Window violation

Critical (3)

Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out

Critical (3)

Unicast Ranging Received Abort Response - Re-initializing

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Also, over the course of 10 minutes earlier today, there are 41 event log entries. It pretty much goes Dynamic Range Window Violation, Unicast Ranging Received Abort Response, Dynamig Range Window violation, Received Response to Broadcase Maintenace Request..., and then just loops those over and over and over.

fossian
Aspirant
Mar 20, 2017
I'm seeing the same problems with my C7000 on Comcast. Firmware is version 1.01.23.

The internet routinely cuts out as the OP described.

Here are the usual entries I see in my event logs:

Critical (3): SYNC Timing Synchronization failure - Failed to acquire FEC framing;
Critical (3): Started Unicast Maintenance Ranging - No Response received - T3 time-out;
Critical (3): No Ranging Response received - T3 time-out;
Warning (5): Dynamic Range Window violation
Critical (3): Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;
DarrenM
Sr. NETGEAR Moderator
Mar 22, 2017
I see you guys are getting T3 and T4 timeouts which typically is a line issue either from the lines coming to your house or in the area you may want to have your ISP come check out what is going on.

https://volpefirm.com/docsis_timout_descriptions/

DarrenM

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Internet Routinely Cuts Out, Upstream and Downstream LEDs switch to amber