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docsis 3.1 modem not provisioning correctly

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Frequent Visitor

docsis 3.1 modem not provisioning correctly

ARRIS SURFboard SBG8300 DOCSIS 3.1 not getting provision correctly

 

for download stream getting only 31 channel, should be getting 32

for upload stream getting extra channel getting 5 of them, it should be only 4

 

 

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Expert

Re: docsis 3.1 modem not provisioning correctly

31 downstream channels is normal on some local systems. They reduced it from 32 to 31 when they implemented the DOCSIS 3.1 OFDM downstream channel for their gigabit speed tier.

 

4 or 5 upstream channels is normal as that is all that they currently offer.

 

Are you actually having any connectivity problems ?



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Frequent Visitor

Re: docsis 3.1 modem not provisioning correctly

Yes. I'm having trouble with connectivity, net goes down for 5 to 10 secs and them come back on, reboots every few hours.  I have DC / Tap and splitter

 

Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Lock Status
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Frequency (Hz)
483000000
465000000
471000000
477000000
489000000
495000000
507000000
513000000
519000000
525000000
531000000
543000000
549000000
555000000
561000000
567000000
573000000
579000000
585000000
591000000
597000000
603000000
609000000
615000000
621000000
627000000
633000000
639000000
645000000
651000000
657000000
SNR (dB)
40.366287
38.983261
40.366287
38.983261
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.946209
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
40.366287
38.983261
38.983261
40.366287
38.983261
40.366287
40.366287
38.983261
40.366287
40.366287
Power Level (dBmV)
0.799999
-0.599998
-0.200001
0.700001
1.099998
1.200001
1.599998
1.799999
1.900002
1.900002
1.799999
2.200001
2.700001
2.599998
2.299999
2.900002
2.799999
2.500000
2.500000
2.299999
2.400002
2.400002
1.799999
1.799999
2.200001
2.000000
1.900002
2.000000
2.200001
2.500000
2.700001
Modulation
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
Highlighted
Expert

Re: docsis 3.1 modem not provisioning correctly

Those are all good. Please post the upstream stats and the error / event log entries as well.



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Frequent Visitor

Re: docsis 3.1 modem not provisioning correctly

here is upstream

Upstream QAM
Channel Bonding Value
Index
1
2
3
4
5
Lock Status
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Frequency (Hz)
30300000
36700000
23700000
41200000
17300000
Symbol Rate (KSym/sec)
5120
5120
5120
1280
5120
Power Level (dBmV)
42.770599
42.270599
43.270599
45.500000
43.770599
Modulation
64QAM
64QAM
64QAM
64QAM
64QAM
Channel Type
US_TYPE_STDMA
US_TYPE_STDMA
US_TYPE_STDMA
US_TYPE_STDMA
US_TYPE_STDMA
 
Highlighted
Frequent Visitor

Re: docsis 3.1 modem not provisioning correctly

Here is all the CM errors, nothing in event logs

CM Error Codewords
Unerrored Codewords
69088
559030611
69089
69088
69089
69088
69089
69089
69088
69089
69088
69089
69088
69088
69089
69088
69089
69089
69088
69089
69088
69089
69088
69088
69089
69088
69088
69089
69088
69089
69088
69089
Correctable Codewords
0
3735936685
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Uncorrectable Codewords
0
3735936685
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Highlighted
Expert

Re: docsis 3.1 modem not provisioning correctly

Well all the stats are in spec. Don't know what's going on if you not getting any error log entries, sorry.

 

Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

 

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

 

 

 



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Frequent Visitor

Re: docsis 3.1 modem not provisioning correctly

thanks for your help

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Official Employee

Re: docsis 3.1 modem not provisioning correctly

Hi there, rmaster. Thank you for posting! I can take a look at your modem on this end, that way we can find out what might be going on with it. Please send me a PM with your first and last name and we can go from there. 

 

To send a private message, please click my name "ComcastMorgan" then select "Send a Message" on the right side.


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