Modem not syncing to DOCSIS 3.1 level (no blue light)

In a post here (https://forums.xfinity.com/conversations/your-home-network/docis-31-issues/604cc285c5375f08cdbb4c5b) the poster said that his modem wasn't syncing to DOCSIS 3.1 levels as evidenced by the blue LED not being lit. I seem to be having the same issue.

The modem is an Arris SB8200. The downstream levels look OK with most channels SNR in the low 40's except for 159 which is at 26.5 at the moment. The upstream looks a little hot which channel 1 at 49.0 and the other four at 50 db.

I had thought that I needed to replace the modem but after reading the other thread I decided I would post here for advice first.

Thanks for reading!

Bill W

Responses

CTGreybeard

Regular Visitor

•

9 Messages

4 years ago

My modem is at 192.168.100.1 but here is what I see:

Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
29	Locked	QAM256	603000000 Hz	4.1 dBmV	41.1 dB	6841	6353
1	Locked	QAM256	423000000 Hz	5.3 dBmV	42.4 dB	30349	48301
2	Locked	QAM256	429000000 Hz	5.1 dBmV	42.3 dB	11231853	2502581
3	Locked	QAM256	435000000 Hz	4.9 dBmV	42.1 dB	9324562	3336505
4	Locked	QAM256	441000000 Hz	4.6 dBmV	42.0 dB	25074	46207
5	Locked	QAM256	453000000 Hz	4.2 dBmV	42.0 dB	19984	39483
6	Locked	QAM256	459000000 Hz	4.2 dBmV	42.1 dB	9101	21929
7	Locked	QAM256	465000000 Hz	4.1 dBmV	41.9 dB	14652	35097
8	Locked	QAM256	471000000 Hz	3.9 dBmV	41.8 dB	45621	46922
9	Locked	QAM256	477000000 Hz	4.0 dBmV	41.8 dB	28707	58237
10	Locked	QAM256	483000000 Hz	3.9 dBmV	41.7 dB	319004	37148
11	Locked	QAM256	489000000 Hz	4.0 dBmV	41.6 dB	24797	36033
12	Locked	QAM256	495000000 Hz	4.1 dBmV	41.7 dB	37726	41010
13	Locked	QAM256	507000000 Hz	4.1 dBmV	41.6 dB	82058	33628
14	Locked	QAM256	513000000 Hz	4.2 dBmV	41.6 dB	72698	61514
15	Locked	QAM256	519000000 Hz	4.2 dBmV	41.6 dB	58521	54650
16	Locked	QAM256	525000000 Hz	4.3 dBmV	41.6 dB	74433	101876
17	Locked	QAM256	531000000 Hz	4.2 dBmV	41.5 dB	68762	114712
18	Locked	QAM256	537000000 Hz	4.3 dBmV	41.6 dB	64508	112255
19	Locked	QAM256	543000000 Hz	4.5 dBmV	41.7 dB	74274	132288
20	Locked	QAM256	549000000 Hz	4.7 dBmV	41.7 dB	111521	87934
21	Locked	QAM256	555000000 Hz	4.8 dBmV	41.7 dB	127787	69610
22	Locked	QAM256	561000000 Hz	4.9 dBmV	41.6 dB	92600	39112
23	Locked	QAM256	567000000 Hz	4.6 dBmV	41.5 dB	82848	38030
24	Locked	QAM256	573000000 Hz	4.5 dBmV	41.4 dB	66825	35151
25	Locked	QAM256	579000000 Hz	4.3 dBmV	41.3 dB	48360	35398
26	Locked	QAM256	585000000 Hz	4.1 dBmV	41.2 dB	33514	35743
27	Locked	QAM256	591000000 Hz	3.9 dBmV	41.1 dB	24577	38174
28	Locked	QAM256	597000000 Hz	3.8 dBmV	40.9 dB	21173	42778
30	Locked	QAM256	609000000 Hz	4.0 dBmV	40.9 dB	22958	57156
31	Locked	QAM256	615000000 Hz	3.9 dBmV	40.9 dB	24531	61243
32	Locked	QAM256	621000000 Hz	4.0 dBmV	40.5 dB	114741	154410
159	Locked	Other	702000000 Hz	4.0 dBmV	26.2 dB	4294967294	297196

Upstream Bonded Channels
Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	9	Locked	SC-QAM Upstream	36500000 Hz	6400000 Hz	50.0 dBmV
2	10	Locked	SC-QAM Upstream	30100000 Hz	6400000 Hz	50.0 dBmV
3	11	Locked	SC-QAM Upstream	23700000 Hz	6400000 Hz	50.0 dBmV
4	12	Locked	SC-QAM Upstream	17300000 Hz	6400000 Hz	50.0 dBmV
5	13	Locked	SC-QAM Upstream	40500000 Hz	1600000 Hz	51.0 dBmV

5

0

BruceW

Gold Problem Solver

•

26.3K Messages

4 years ago

... can you post your levels from http://10.0.0.1/ ...

For a straight cable modem like the SB8200 the address would be http://192.168.100.1

0

U

user_bbfd72

Visitor

•

1 Message

4 years ago

I have the exact same problem. I have two identical modems... both new. Same issue. Xfinity wants to blame it on my hardware... I am sceptical!

1

0

EG

Expert

•

110.1K Messages

@user_bbfd72

Please create a new topic of your own here on this board detailing your issue. Thanks. The original poster has not returned. 5 month old dead thread now being closed.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer! tick

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer! tick

4 years ago

0

Your Home Network

CTGreybeard

Modem not syncing to DOCSIS 3.1 level (no blue light)

CTGreybeard

BruceW

user_bbfd72

EG

New to the Community?