Re: CM700 Downstream Light blinking

Osirus · ‎2020-10-08

Purchased a new CM700 and activated (via online) with Comcast. Before I had Arris SB6580 and had download speed of >150 mpbs, now I am getting <90 mpbs with blinking download stream light.

Here is a copy of the error logs. Can someone tell me how to fix this blinking downstream light and the errors seeing on the error log?

Thanks!

Oct 08 2020 02:53:54	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:54:11	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:54:23	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:54:26	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:54:26	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:54:41	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:54:53	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:54:56	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:54:56	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:55:14	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:55:27	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:55:30	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:55:30	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:55:46	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:55:59	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:56:02	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:56:02	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:56:19	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:56:35	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:56:38	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:56:38	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:56:54	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:57:16	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:57:19	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:57:19	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:57:34	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:57:47	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:57:50	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:57:50	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:58:07	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:58:29	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:58:32	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:58:32	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:58:49	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:59:05	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:59:08	Critical (3)	SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period
Oct 08 2020 02:59:08	Error (4)	RCS Primary DS Failure
Oct 08 2020 02:59:25	Critical (3)	No Ranging Response received - T3 time-out
Oct 08 2020 02:59:41	Warning (5)	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Oct 08 2020 02:59:44	Warning (5)	RCS Partial Service

plemans · ‎2020-10-08

Do you also have a screen snip of the cable connections page?

If you have any splitters, amplifiers, or attenuators in line, I'd remove them. These can sometimes cause issues.

Check the line for kinks, damage, cheap/bad connectors, loose connectors. Preferablly, move the modem to right where the coax enters the home to prevent wiring in the home from being the issue.

Osirus · ‎2020-10-08

I am not sure what you mean by a "screen snip of the cable connections page."

With regards to other devices, I do not have any splitters, amplifiers, or attenuators.

I will try to replace the coaxial cable and see if that helps.

Thanks for your suggestions.

Osirus · ‎2020-10-08

If you mean this...

Apply Cancel

Frequency start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure	Status	Comment
Acquire Downstream Channel	663000000 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	QAM 256	26	555000000 Hz	-17.3 dBmV	30.0 dB	22769409	5169734
2	Locked	QAM 256	27	561000000 Hz	-10.7 dBmV	33.4 dB	5312	2128
3	Locked	QAM 256	28	567000000 Hz	-8.5 dBmV	35.0 dB	18	0
4	Locked	QAM 256	29	573000000 Hz	-7.7 dBmV	30.5 dB	26287	0
5	Locked	QAM 256	30	579000000 Hz	-7.5 dBmV	31.6 dB	3541	0
6	Locked	QAM 256	31	585000000 Hz	-7.0 dBmV	27.8 dB	53227437	4307073
7	Locked	QAM 256	32	591000000 Hz	-7.2 dBmV	31.9 dB	35	1
8	Locked	QAM 256	33	597000000 Hz	-7.0 dBmV	33.0 dB	32	0
9	Locked	QAM 256	34	603000000 Hz	-6.4 dBmV	33.4 dB	11	0
10	Locked	QAM 256	35	609000000 Hz	-6.4 dBmV	34.9 dB	6	1
11	Locked	QAM 256	36	615000000 Hz	-6.4 dBmV	34.9 dB	30	0
12	Locked	QAM 256	37	621000000 Hz	-5.7 dBmV	34.9 dB	8	0
13	Locked	QAM 256	38	627000000 Hz	-6.0 dBmV	35.0 dB	21	0
14	Locked	QAM 256	39	633000000 Hz	-5.7 dBmV	35.1 dB	6	0
15	Locked	QAM 256	40	639000000 Hz	-6.2 dBmV	34.9 dB	3	0
16	Locked	QAM 256	41	645000000 Hz	-6.0 dBmV	34.9 dB	5	0
17	Locked	QAM 256	42	651000000 Hz	-6.2 dBmV	34.5 dB	35	0
18	Locked	QAM 256	43	657000000 Hz	-6.2 dBmV	34.9 dB	0	0
19	Locked	QAM 256	44	663000000 Hz	-6.4 dBmV	34.4 dB	2	0
20	Locked	QAM 256	45	669000000 Hz	-6.2 dBmV	34.8 dB	2	0
21	Locked	QAM 256	46	675000000 Hz	-6.2 dBmV	34.8 dB	6	0
22	Locked	QAM 256	47	681000000 Hz	-5.7 dBmV	34.8 dB	11	0
23	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
24	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
25	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
26	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
27	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
28	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
29	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
30	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
31	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 dB	0	0
32	Not Locked	N/A	N/A	0 Hz	0.0 dBmV	0.0 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	16400000 Hz	43.5 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	44.3 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	44.8 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	45.0 dBmV
5	Locked	ATDMA	5	1280 Ksym/sec	39600000 Hz	42.3 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

plemans · ‎2020-10-09

You need to get your line checked. You have errors in the line, power levels out of spec, and unlocked channels. All signs the isp needs to check the lines.

Osirus · ‎2020-10-09

Thank you for your posts @plemans . You were correct. A technician from Xfinity just came out and checked the line. He said the signals are all over the place. He fixed the line and now everything is working!

Osirus · ‎2020-10-09

In case you are wondering here is the status after the technician fixed the outside cable line...

<tabindex=-1>Startup Procedure</tabindex=-1>

Procedure	Status	Comment
Acquire Downstream Channel	681000000 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	QAM 256	16	489000000 Hz	2.0 dBmV	35.0 dB	7	0
2	Locked	QAM 256	17	495000000 Hz	1.7 dBmV	34.9 dB	0	0
3	Locked	QAM 256	18	507000000 Hz	1.5 dBmV	34.3 dB	1	0
4	Locked	QAM 256	19	513000000 Hz	1.9 dBmV	35.0 dB	0	0
5	Locked	QAM 256	20	519000000 Hz	1.4 dBmV	35.0 dB	0	0
6	Locked	QAM 256	21	525000000 Hz	1.5 dBmV	35.0 dB	13	0
7	Locked	QAM 256	22	531000000 Hz	1.5 dBmV	34.9 dB	0	0
8	Locked	QAM 256	23	537000000 Hz	1.5 dBmV	34.3 dB	0	0
9	Locked	QAM 256	24	543000000 Hz	1.9 dBmV	34.9 dB	0	0
10	Locked	QAM 256	25	549000000 Hz	1.4 dBmV	34.4 dB	0	0
11	Locked	QAM 256	26	555000000 Hz	1.5 dBmV	34.3 dB	0	0
12	Locked	QAM 256	27	561000000 Hz	1.5 dBmV	35.0 dB	0	0
13	Locked	QAM 256	28	567000000 Hz	1.2 dBmV	34.9 dB	1	0
14	Locked	QAM 256	29	573000000 Hz	1.7 dBmV	33.7 dB	0	0
15	Locked	QAM 256	30	579000000 Hz	1.5 dBmV	33.8 dB	0	0
16	Locked	QAM 256	31	585000000 Hz	1.9 dBmV	33.8 dB	0	1
17	Locked	QAM 256	32	591000000 Hz	1.7 dBmV	33.8 dB	0	0
18	Locked	QAM 256	33	597000000 Hz	1.7 dBmV	32.9 dB	0	0
19	Locked	QAM 256	34	603000000 Hz	2.2 dBmV	33.3 dB	1	0
20	Locked	QAM 256	35	609000000 Hz	2.2 dBmV	34.4 dB	0	0
21	Locked	QAM 256	36	615000000 Hz	2.2 dBmV	34.3 dB	0	0
22	Locked	QAM 256	37	621000000 Hz	2.7 dBmV	34.3 dB	0	0
23	Locked	QAM 256	38	627000000 Hz	2.4 dBmV	33.9 dB	0	0
24	Locked	QAM 256	39	633000000 Hz	2.7 dBmV	33.9 dB	0	0
25	Locked	QAM 256	40	639000000 Hz	2.0 dBmV	33.9 dB	0	0
26	Locked	QAM 256	41	645000000 Hz	2.2 dBmV	33.9 dB	0	0
27	Locked	QAM 256	42	651000000 Hz	1.9 dBmV	33.5 dB	0	0
28	Locked	QAM 256	43	657000000 Hz	1.7 dBmV	34.3 dB	0	0
29	Locked	QAM 256	44	663000000 Hz	1.4 dBmV	34.0 dB	0	0
30	Locked	QAM 256	45	669000000 Hz	1.5 dBmV	33.9 dB	0	0
31	Locked	QAM 256	46	675000000 Hz	1.5 dBmV	33.8 dB	0	0
32	Locked	QAM 256	47	681000000 Hz	2.0 dBmV	33.6 dB	10	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120 Ksym/sec	16400000 Hz	35.8 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	36.5 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	36.5 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	36.5 dBmV
5	Locked	ATDMA	5	1280 Ksym/sec	39600000 Hz	33.0 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

plemans · ‎2020-10-10

Hows it working? Got your logs with that?

reason I ask is your snr is a boarderline and the upstream power seems a touch low.

But in some cases, that'll work fine so its more about how well its working and how the logs look.

Osirus · ‎2020-10-10

It's working out better than before, but you are correct. The upload is not as high as expected. But it is much better than before. I get about 16 mbps upload and 86 mbps download. So I can live with that.

By the way, if I switch the modem to Arris SBG6580, I get 180 mbps download but only 5 mbps upload. I didn't realize modems made that much of a difference.

I was wondering if you had any idea why that is.

plemans · ‎2020-10-10

What speeds do you pay for?

both upload and download.

Who's your isp?

Osirus · ‎2020-10-10

I paid for 75 mbps download and 25 mbps upload. My ISP is comcast.

While download is better than expected, upload is slightly lower.

plemans · ‎2020-10-10

I have no idea how the sbg8250 is getting 180mbps. sometimes ISP's overprovision but its usually only 10-20%. Not 200%+

Osirus · ‎2020-10-10

Yeah, it's a mystery. I have searched everywhere on the web for an answer and no one seems to have an answer.

plemans · ‎2020-10-10

Makes me curious if they provisioned it wrong.