XB8 Modem drops 3-4 times per day

Hello All,

Down & Upstream values attached. long lurker of the thread. Bought solid copper coax line for modem, fan (placed under modem in well ventilated opens area) to keep it cold since arguable heating issues, none seem to help the disconnections. Also, replace modem twice a year and none last over a week until the drops start to happen. Are my values bad? VAP via event logs say down a few times as well.

Downstream	Channel Bonding Value
Channel ID		13	14	15	16
Lock oratus	Locked	Locked	Locked	Locked	Locked
Frequency	651 MHZ	471 MHZ	477 MHZ	483 MHz	489 MHZ
SNR	37.1 dB	38.3 dB	38.4 dB	38.2 dB	38.2 dB
Power Level	-7.4 dBmV	-5.2 dBmV	-5.4 dBmV	-5.7 dBmV	-5.7 dBmV
Modulation	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM

*Channel ID O is the Primary channel

Upstream	Channel Bonding Value
Channel ID			3
Lock statUs	Not Locked	Not Locked	Not Locked
Frequency	10 MHz	16 MHz	22 MHz
Symbol Rate	2560	5120	5120
Power Level	35.0 dBmV	40X08mV	38.0 dBmV
Modulation	QAM	QAM	QAM
Channel lype	ATDMA	ATDMA	ATDMA

Responses

EG

Expert

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111.6K Messages

25 days ago

Are there any additional downstream and upstream channels being shown, other than the ones you posted ? If so, please post them as well.

The downstream power is on the low / weak side and it may be intermittently fluctuating even lower to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are 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 from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, animal chews.

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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emygolden

Visitor

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3 Messages

Thank you! Those were all of my upstream channels. The only thing I can think of is this HUGE 9 way PPC splitter that was installed likely with the original owner of my house. Connects my street line to essentially all main rooms of the house including my downstairs where I put my modem. ———Should I attach a splitter to my Moca filter inbound and split it to my downstairs and originally PPC box.———- I don’t use cable anymore but I do see a few ADT alarm system lines that go to the box.

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25 days ago

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EG

Expert

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111.6K Messages

25 days ago

You could try that and see. You can always undo it if it makes things worse. You may want to consider getting that tech visit. Good luck !

1

E

emygolden

Visitor

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3 Messages

Hey! I split my downstairs (where modem is from the 9 splitter box). I don’t know how to read these values but they seem way better. I got more upstream channels and downstream ones?? Don’t know if that’s bad or not but attached are the new values. Can you let me know if this is improvement? Thank you!!

Downstream	Channel Bonding Value
Channel ID	37	13	13	15	16	17	18	19	20	21	22	23	24	25	26	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	159
Lock Status	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked																			Locked
Frequency	627 MHz	471 MHz	477 MHz	483 MHz	489 MHz	495 MHz	507 MHz	513 MHz	519 MHz	525 MHz	531 MHz	543 MHz	549 MHz	555 MHz	561 MHz																			722000000
SNR	36.9 dB	38.3 dB	38.3 dB	38.1 dB	37.9 dB	38.1 dB	37.4 dB	37.7 dB	37.8 dB	38.0 dB	38.2 dB	37.4 dB	38.0 dB	37.6 dB	37.8 dB																			36.3 dB
Power Level	-9.8 dBmV	-7.8 dBmV	-8.0 dBmV	-8.1 dBmV	-8.7 dBmV	-8.3 dBmV	-9.0 dBmV	-9.3 dBmV	-9.1 dBmV	-8.5 dBmV	-8.5 dBmV	-8.7 dBmV	-8.5 dBmV	-9.2 dBmV	-8.9 dBmV																			-8.2 dBmV
Modulation	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	Unknown	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM																			OFDM

*Channel ID 37 is the Primary channel

Upstream	Channel Bonding Value
Channel ID	1	2	3	4	5	6
Lock Status	Not Locked	Not Locked	Not Locked	Not Locked	Locked	Locked
Frequency	10 MHz	16 MHz	22 MHz	29 MHz	35 MHz	40 MHz
Symbol Rate	2560	5120	5120	5120	5120	2560
Power Level	40.8 dBmV	43.8 dBmV	43.8 dBmV	48.3 dBmV	46.8 dBmV	46.8 dBmV
Modulation	QAM	QAM	QAM	QAM	QAM	QAM
Channel Type	ATDMA	ATDMA	ATDMA	ATDMA	ATDMA

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23 days ago

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EG

Expert

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111.6K Messages

22 days ago

Actually, they are worse.

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emygolden

XB8 Modem drops 3-4 times per day

EG

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