NETGEAR c7000v2 slow speed with blinking lights

timmyK · ‎2021-12-03

I have 200 Mbps connection and I get around 120-180 Mbps during the day. At nights, it gets slow. (20-40 Mbps).

These lights are blinking a green light on the router:

Download arrow
2.4GHz icon
5 GHz icon

In cable connection page, I see "Downstream Bonded Channels (Partial Service)" but not sure what it means. I've tried restarting the router, but it didn't seem to help much.

Firmware Version

V1.03.03

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	651000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels (Partial Service)

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	44	651000000 Hz	-0.5 dBmV	39.1 dB	1480	853
2	Locked	QAM256	24	531000000 Hz	-0.9 dBmV	38 dB	4603	1218
3	Locked	QAM256	25	537000000 Hz	-0.8 dBmV	39.5 dB	2332	674
4	Locked	QAM256	26	543000000 Hz	-0.7 dBmV	39.5 dB	2063	1254
5	Locked	QAM256	27	549000000 Hz	-0.8 dBmV	39.4 dB	1713	926
6	Locked	QAM256	28	555000000 Hz	-0.9 dBmV	39.2 dB	2434	963
7	Locked	QAM256	29	561000000 Hz	-0.8 dBmV	38.1 dB	5	0
8	Locked	QAM256	30	567000000 Hz	-0.8 dBmV	38.8 dB	2663	993
9	Locked	QAM256	31	573000000 Hz	-0.8 dBmV	39.2 dB	1970	838
10	Locked	QAM256	32	579000000 Hz	-0.7 dBmV	39.1 dB	2352	981
11	Locked	QAM256	33	585000000 Hz	-0.6 dBmV	39.1 dB	2131	904
12	Locked	QAM256	34	591000000 Hz	-0.6 dBmV	38.8 dB	2330	921
13	Locked	QAM256	35	597000000 Hz	-0.6 dBmV	37.6 dB	2986	794
14	Not Locked	Unknown	36	603000000 Hz	0.0 dBmV	0.0 dB	0	0
15	Locked	QAM256	37	609000000 Hz	-0.5 dBmV	32.9 dB	271538148	36048345
16	Locked	QAM256	38	615000000 Hz	-0.6 dBmV	39.5 dB	2111	865
17	Locked	QAM256	39	621000000 Hz	-0.8 dBmV	39.7 dB	0	0
18	Locked	QAM256	40	627000000 Hz	-0.8 dBmV	38.7 dB	0	0
19	Locked	QAM256	41	633000000 Hz	-0.8 dBmV	37.2 dB	0	0
20	Locked	QAM256	42	639000000 Hz	-0.5 dBmV	39.4 dB	0	0
21	Locked	QAM256	43	645000000 Hz	-0.4 dBmV	39.9 dB	0	0
22	Locked	QAM256	45	657000000 Hz	-0.7 dBmV	39.5 dB	0	0
23	Locked	QAM256	46	663000000 Hz	-0.7 dBmV	39.5 dB	0	0
24	Locked	QAM256	47	669000000 Hz	-0.6 dBmV	39.9 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 Ksym/sec	29200000 Hz	51 dBmV
2	Locked	ATDMA	5	5120 Ksym/sec	16400000 Hz	53 dBmV
3	Locked	ATDMA	6	5120 Ksym/sec	22800000 Hz	52.5 dBmV
4	Locked	ATDMA	8	5120 Ksym/sec	35600000 Hz	49.8 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Fri Dec 03 21:50:00 2021

System Up Time:19 days 13:47:28

timmyK · ‎2021-12-03

This is the connection page after restarting the router. Speed seems faster now but the lights are still blinking.

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	651000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels (Partial Service)

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	44	651000000 Hz	-0.3 dBmV	39.7 dB	0	0
2	Locked	QAM256	24	531000000 Hz	-0.8 dBmV	38.7 dB	0	0
3	Locked	QAM256	25	537000000 Hz	-0.6 dBmV	40.2 dB	0	0
4	Locked	QAM256	26	543000000 Hz	-0.6 dBmV	40.1 dB	0	0
5	Locked	QAM256	27	549000000 Hz	-0.7 dBmV	40.1 dB	0	0
6	Locked	QAM256	28	555000000 Hz	-0.7 dBmV	39.8 dB	0	0
7	Locked	QAM256	29	561000000 Hz	-0.7 dBmV	39 dB	0	0
8	Locked	QAM256	30	567000000 Hz	-0.7 dBmV	39.5 dB	0	0
9	Locked	QAM256	31	573000000 Hz	-0.6 dBmV	39.9 dB	0	0
10	Locked	QAM256	32	579000000 Hz	-0.5 dBmV	39.7 dB	0	0
11	Locked	QAM256	33	585000000 Hz	-0.4 dBmV	39.8 dB	0	0
12	Locked	QAM256	34	591000000 Hz	-0.4 dBmV	39.4 dB	0	0
13	Locked	QAM256	35	597000000 Hz	-0.4 dBmV	38.1 dB	0	0
14	Not Locked	Unknown	36	603000000 Hz	0.0 dBmV	0.0 dB	0	0
15	Locked	QAM256	37	609000000 Hz	-0.4 dBmV	33.4 dB	51928	9066
16	Locked	QAM256	38	615000000 Hz	-0.4 dBmV	40.1 dB	0	0
17	Locked	QAM256	39	621000000 Hz	-0.6 dBmV	40.5 dB	0	0
18	Locked	QAM256	40	627000000 Hz	-0.6 dBmV	38.8 dB	0	0
19	Locked	QAM256	41	633000000 Hz	-0.6 dBmV	38.6 dB	0	0
20	Locked	QAM256	42	639000000 Hz	-0.4 dBmV	40.2 dB	0	0
21	Locked	QAM256	43	645000000 Hz	-0.2 dBmV	40.8 dB	0	0
22	Locked	QAM256	45	657000000 Hz	-0.5 dBmV	40.3 dB	0	0
23	Locked	QAM256	46	663000000 Hz	-0.6 dBmV	40.3 dB	0	0
24	Locked	QAM256	47	669000000 Hz	-0.4 dBmV	40.3 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	6	5120 Ksym/sec	22800000 Hz	52.3 dBmV
2	Locked	ATDMA	5	5120 Ksym/sec	16400000 Hz	53.3 dBmV
3	Locked	ATDMA	7	5120 Ksym/sec	29200000 Hz	50.8 dBmV
4	Locked	ATDMA	8	5120 Ksym/sec	35600000 Hz	50 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Fri Dec 03 22:14:49 2021

System Up Time:00:08:27

plemans · ‎2021-12-04

Are you using an amplifier? Based off the power levels that you have for your downstream, your upstream is pretty high.

If you have any amplifiers, splitters, or signal attenuators in the line, remove them.

do you also have the modem event logs? That helps us check long term.

All rebooting does is clear out the errors. It might help the speeds short term if the modem connects on a different frequency but long term, it isn't going to fix the problem.

timmyK · ‎2021-12-06

@plemans Thanks for the reply. I don't have any amplifier setup. I hooked up the ISP cable directly into my router

Connection seems to be stable now, but the lights on the router are still blinking. (downstream arrow, 2.4ghz, 5 ghz icons).

Attaching the event logs:(Advanced > Administration > Event Logs)

Time	Priority	Description
2021-12-3, 22:13:04	Warning (5)	MDD message timeout;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:45	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
1970-1-1, 00:00:40	Notice (6)	WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:40	Notice (6)	WiFi Interface [wl0] set to Channel 2 (Side-Band Channel:N/A) - Reason:INIT
1970-1-1, 00:00:37	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-11-24, 12:22:52	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;
2021-11-15, 12:35:58	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:00:37	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-11-8, 22:48:10	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;
1970-1-1, 00:39:09	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:39:03	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:58	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:56	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:55	Critical (3)	DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:07	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:06	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:38:03	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:37:24	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:37:22	Critical (3)	DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:36:35	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:36:31	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:36:29	Critical (3)	No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:36:12	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:36:11	Critical (3)	No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:35:54	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:35:53	Critical (3)	No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:35:29	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:35:28	Critical (3)	DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:41	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:40	Critical (3)	No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:23	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:22	Critical (3)	No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:05	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:04	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:03	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:34:01	Critical (3)	DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:33:14	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:33:08	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:33:08	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:33:06	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;

And here is the logs (Advanced > Administration > Logs)

I was very concerned about DoS attack at first, but then read online that it's a false alarm due to iPhone or iPad devices.

https://community.netgear.com/t5/Cable-Modems-Routers/DoS-attack-Teardrop-or-derivative-Ping-of-Deat...

admin login failure] from source 192.168.0.21	1	Mon Dec 06 13:01:03 2021	0.0.0.0:0	192.168.0.21:0
[DoS attack: Ping Of Death] from 73.1.0.80, port 0	3	Mon Dec 06 12:49:22 2021	232.215.176.155:0	73.1.0.80:0
[DoS attack: Teardrop or derivative] from 73.1.0.80, port 0	1	Mon Dec 06 12:49:20 2021	232.215.176.155:0	73.1.0.80:0
[DoS attack: Ping Of Death] from 73.1.0.80, port 0	2	Mon Dec 06 12:48:36 2021	232.215.176.155:0	73.1.0.80:0
[DoS attack: Teardrop or derivative] from 73.1.0.80, port 0	2	Mon Dec 06 12:48:35 2021	232.215.176.155:0	73.1.0.80:0
[DoS attack: Ping Of Death] from 73.1.0.80, port 0	8	Mon Dec 06 12:46:33 2021	232.215.176.155:0	73.1.0.80:0

plemans · ‎2021-12-06

The 2.4ghz/5ghz lights will blink. That just indicates data transfer.

the downstream icon should be locked.

You are having error and not locked channels.

And while your power is technically in spec, somethings causing issues. That can be told by how high your upstream power levels are in relation to your downstream. Add in the errors and not locked channels and I'd be checking the cable/wires/connectors.

If that doesn't help, then the ISP would need to check the line.

NETGEAR c7000v2 slow speed with blinking lights

NETGEAR c7000v2 slow speed with blinking lights

Re: NETGEAR c7000v2 slow speed with blinking lights

Re: NETGEAR c7000v2 slow speed with blinking lights

Re: NETGEAR c7000v2 slow speed with blinking lights

Re: NETGEAR c7000v2 slow speed with blinking lights