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Re: Random Modem Resets, several times over the last few days.

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New Poster

Re: Random Modem Resets, several times over the last few days.

I have same modem and mine has too. I was thinking it was an Xfinity issue though.?
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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

I agree and think it's an Xfinity issue. I thought I would post a message to see if others have had the same issue. I'm hoping someone might know how to resolve it or can confirm that its an issue with Xfinity. 

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Expert

Re: Random Modem Resets, several times over the last few days.

Start here;


https://forums.xfinity.com/t5/Your-Home-Network/Internet-Troubleshooting-Tips/m-p/3310447#M316652

 

 

 



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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

Thanks for that info. After a quick review the issue seems to be "critical T3 timeouts" I'm seeing the modem reset everytime the T3 timeouts happen. I now need to figure out what's causing the issue. 

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Expert

Re: Random Modem Resets, several times over the last few days.

Are the signal status numbers in spec ? The values are there in those tips.



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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel Locked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 

 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1Locked256QAM16477.00 MHz0.60 dBmV38.61 dB54038
2Locked256QAM17483.00 MHz0.80 dBmV38.61 dB75942
3Locked256QAM18489.00 MHz0.70 dBmV38.61 dB110444
4Locked256QAM19495.00 MHz0.60 dBmV38.61 dB125936
5Not Locked----20507.00 MHz----------------
6Locked256QAM21513.00 MHz0.30 dBmV35.60 dB204738
7Locked256QAM22519.00 MHz0.40 dBmV37.36 dB268733
8Locked256QAM23525.00 MHz0.10 dBmV37.36 dB327128
9Locked256QAM24531.00 MHz0.10 dBmV37.64 dB305637
10Locked256QAM25537.00 MHz0.30 dBmV37.64 dB229839
11Locked256QAM26543.00 MHz0.30 dBmV37.64 dB256736
12Locked256QAM27549.00 MHz0.40 dBmV37.64 dB345237
13Locked256QAM28555.00 MHz0.30 dBmV37.64 dB314139
14Locked256QAM29561.00 MHz0.20 dBmV37.64 dB262031
15Locked256QAM30567.00 MHz0.40 dBmV37.36 dB16340
16Locked256QAM31573.00 MHz-0.10 dBmV37.64 dB16670
17Locked256QAM32579.00 MHz-0.30 dBmV37.64 dB15232
18Locked256QAM33585.00 MHz-0.60 dBmV37.64 dB12940
19Locked256QAM34591.00 MHz-0.70 dBmV37.36 dB18116
20Locked256QAM35597.00 MHz-0.50 dBmV37.36 dB16500
21Locked256QAM36603.00 MHz-0.30 dBmV35.78 dB10960
22Locked256QAM37609.00 MHz-0.50 dBmV37.36 dB4810
23Locked256QAM38615.00 MHz-0.30 dBmV37.36 dB2580
24Locked256QAM39621.00 MHz-0.30 dBmV37.36 dB1810
25Locked256QAM40627.00 MHz0.20 dBmV37.90 dB1380
26Locked256QAM41633.00 MHz0.10 dBmV38.60 dB1040
27Locked256QAM42639.00 MHz-0.30 dBmV38.60 dB1340
28Locked256QAM43645.00 MHz-0.60 dBmV38.20 dB1480
29Locked256QAM44651.00 MHz-0.90 dBmV38.20 dB1730
30Locked256QAM45657.00 MHz-0.60 dBmV38.60 dB2790
31Locked256QAM46663.00 MHz-0.10 dBmV38.60 dB2500
32Locked256QAM47669.00 MHz0.10 dBmV38.60 dB1870

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 kSym/s30.30 MHz52.25 dBmV
2LockedATDMA15120 kSym/s17.30 MHz51.75 dBmV
3LockedATDMA45120 kSym/s36.70 MHz53.00 dBmV
4LockedATDMA25120 kSym/s23.70 MHz51.00 dBmV
5LockedATDMA51280 kSym/s41.20 MHz51.25 dBmV



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Expert

Re: Random Modem Resets, several times over the last few days.

The upstream power is too high and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.



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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

Okay, I went out and removed the 3-way splitter and did a direct connection to the modem. I only use Xfinity for internet so this isn't an issue moving forward. See below for the new data.

 

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel Locked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 

 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1Locked256QAM16477.00 MHz3.90 dBmV38.98 dB470
2Locked256QAM17483.00 MHz4.20 dBmV38.61 dB270
3Locked256QAM18489.00 MHz4.20 dBmV38.61 dB320
4Locked256QAM19495.00 MHz3.90 dBmV38.61 dB320
5Not Locked----20507.00 MHz----------------
6Locked256QAM21513.00 MHz3.90 dBmV36.39 dB280
7Locked256QAM22519.00 MHz4.00 dBmV38.61 dB492
8Locked256QAM23525.00 MHz3.70 dBmV38.98 dB2420
9Locked256QAM24531.00 MHz3.90 dBmV38.61 dB484
10Locked256QAM25537.00 MHz3.80 dBmV38.61 dB751
11Locked256QAM26543.00 MHz3.90 dBmV38.61 dB4713
12Locked256QAM27549.00 MHz4.00 dBmV38.61 dB320
13Locked256QAM28555.00 MHz3.90 dBmV38.98 dB340
14Locked256QAM29561.00 MHz3.70 dBmV38.98 dB420
15Locked256QAM30567.00 MHz3.80 dBmV38.61 dB400
16Locked256QAM31573.00 MHz3.40 dBmV38.61 dB310
17Locked256QAM32579.00 MHz3.30 dBmV38.61 dB40
18Locked256QAM33585.00 MHz2.90 dBmV37.64 dB00
19Locked256QAM34591.00 MHz3.00 dBmV37.64 dB00
20Locked256QAM35597.00 MHz3.40 dBmV37.64 dB00
21Locked256QAM36603.00 MHz3.40 dBmV37.64 dB00
22Locked256QAM37609.00 MHz3.10 dBmV37.64 dB00
23Locked256QAM38615.00 MHz3.30 dBmV37.64 dB00
24Locked256QAM39621.00 MHz3.40 dBmV38.61 dB00
25Locked256QAM40627.00 MHz3.80 dBmV38.20 dB00
26Locked256QAM41633.00 MHz3.70 dBmV38.60 dB00
27Locked256QAM42639.00 MHz3.50 dBmV38.60 dB00
28Locked256QAM43645.00 MHz3.30 dBmV38.60 dB00
29Locked256QAM44651.00 MHz2.80 dBmV38.60 dB00
30Locked256QAM45657.00 MHz3.20 dBmV38.60 dB00
31Locked256QAM46663.00 MHz3.60 dBmV38.60 dB160
32Locked256QAM47669.00 MHz3.80 dBmV38.60 dB110

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 kSym/s30.30 MHz48.50 dBmV
2LockedATDMA15120 kSym/s17.30 MHz48.25 dBmV
3LockedATDMA45120 kSym/s36.70 MHz49.25 dBmV
4LockedATDMA25120 kSym/s23.70 MHz47.50 dBmV
5LockedATDMA51280 kSym/s41.20 MHz47.75 dBmV



 

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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

I also noticed there was a filter before the main line was going into the 3-way. Should I keep that on or remove it now that it's a direct line into the modem?

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Expert

Re: Random Modem Resets, several times over the last few days.

It's better, but I would still like to see a bit more wiggle room. 40 to 45 dB would be ideal. 

 

As far as that filter goes, it depends on what type it is and why it was put there. If it is a MoCA POE filter, and you don't have or use MoCA, then it can be removed. If it is a noise filter that was put there by Comcast you may or may not still need it. Try removing it and see what happens. It may be benign and not causing any loss, and could possibly be left alone or re-installed. YMMV.



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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

The filter is a FRSA50, below are the stats without the filter.

 

Startup Procedure

ProcedureStatusComment
Acquire Downstream Channel Locked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 

 
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
1Locked256QAM16477.00 MHz4.60 dBmV38.61 dB90
2Locked256QAM17483.00 MHz4.90 dBmV38.98 dB00
3Locked256QAM18489.00 MHz4.90 dBmV38.61 dB120
4Locked256QAM19495.00 MHz4.60 dBmV38.61 dB00
5Locked256QAM20507.00 MHz4.50 dBmV27.69 dB159964273
6Locked256QAM21513.00 MHz4.40 dBmV36.61 dB00
7Locked256QAM22519.00 MHz4.50 dBmV37.36 dB00
8Locked256QAM23525.00 MHz4.40 dBmV38.98 dB00
9Locked256QAM24531.00 MHz4.50 dBmV38.61 dB00
10Locked256QAM25537.00 MHz4.60 dBmV38.61 dB00
11Locked256QAM26543.00 MHz4.70 dBmV38.98 dB00
12Locked256QAM27549.00 MHz4.70 dBmV38.61 dB00
13Locked256QAM28555.00 MHz4.80 dBmV38.61 dB00
14Locked256QAM29561.00 MHz4.50 dBmV38.98 dB00
15Locked256QAM30567.00 MHz4.50 dBmV38.61 dB00
16Locked256QAM31573.00 MHz4.00 dBmV38.61 dB00
17Locked256QAM32579.00 MHz3.80 dBmV38.61 dB00
18Locked256QAM33585.00 MHz3.50 dBmV38.61 dB00
19Locked256QAM34591.00 MHz3.40 dBmV37.64 dB00
20Locked256QAM35597.00 MHz4.00 dBmV37.64 dB00
21Locked256QAM36603.00 MHz4.30 dBmV37.64 dB00
22Locked256QAM37609.00 MHz4.10 dBmV37.64 dB00
23Locked256QAM38615.00 MHz4.20 dBmV38.61 dB00
24Locked256QAM39621.00 MHz4.10 dBmV38.61 dB00
25Locked256QAM40627.00 MHz4.50 dBmV36.90 dB00
26Locked256QAM41633.00 MHz4.30 dBmV38.90 dB00
27Locked256QAM42639.00 MHz4.00 dBmV37.30 dB00
28Locked256QAM43645.00 MHz3.90 dBmV38.90 dB00
29Locked256QAM44651.00 MHz3.40 dBmV38.90 dB00
30Locked256QAM45657.00 MHz4.00 dBmV39.20 dB00
31Locked256QAM46663.00 MHz4.50 dBmV37.90 dB00
32Locked256QAM47669.00 MHz4.80 dBmV37.90 dB00

 

 
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA35120 kSym/s30.30 MHz38.50 dBmV
2LockedATDMA15120 kSym/s17.30 MHz38.75 dBmV
3LockedATDMA45120 kSym/s36.70 MHz39.75 dBmV
4LockedATDMA25120 kSym/s23.70 MHz38.00 dBmV
5LockedATDMA51280 kSym/s41.20 MHz37.50 dBmV

 

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Expert

Re: Random Modem Resets, several times over the last few days.

That trap is a dinosaur device. The upstream stats are so much better !! Bottom line. Live with it for a while now and see. You should be golden !


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Frequent Visitor

Re: Random Modem Resets, several times over the last few days.

Can't thank you enough! You're the best! Thanks for all the help today.

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Expert

Re: Random Modem Resets, several times over the last few days.

My pleasure !! I hope that things hold up for you ! Good luck !



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