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Constant Speed Drops

New Poster

Constant Speed Drops

I am having constant drops in my internet speeds. I'll go from 120 Mbps to 0.5 Mbps and the only fix is to power cycle. This happens 10+ times a week. I've bought a new modem at Xfinity's suggestion and the issue persists. What gives?
Expert

Re: Constant Speed Drops

Is this with a WiFi connection ? If so, for a test, does a computer hardwired directly to the router / gateway device with an ethernet cable have the same problem ?

 

What do the modem's signal stats look like ?  Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?




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New Poster

Re: Constant Speed Drops

Screenshot_20190929-112834_Chrome.jpgThe modem is an Arris SB6183. When network speeds are impacted it affects both wired and wireless hardware. A power cycle fixes it when it occurs. But it can occur several times a day. 

New Poster

Re: Constant Speed Drops

Looks like I can't post the image? 

 

Downstream

1:      - 10.0 dBmV     40.4dB

2:     - 10.3 dBmV    40.3dB

3:     - 10.7 dBmV    40.1dB

4:     - 10.6 dBmV    40.2dB

5:     - 10.4 dBmV    40.3dB

6:     - 10.3 dBmV    40.3dB

7:     - 10.3 dBmV    40.2dB

8:    -  10.6 dBmV    40.2dB

9:     - 10.0 dBmV    40.4dB

10:   - 9.8 dBmV    40.4dB

11:    - 10.3 dBmV    40.2dB

12:   - 11.4 dBmV    39.8dB

13:   - 11.6 dBmV    39.7dB

14:   - 10.8 dBmV    39.8dB

15:   - 11.1 dBmV    39.7dB

16:   - 12.2 dBmV    39.3dB

New Poster

Re: Constant Speed Drops

Upstream

 

17: 54.0 dBmV

18: 54.0 dBmV

19: 54.0 dBmV

Expert

Re: Constant Speed Drops

The power levels are out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

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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New Poster

Re: Constant Speed Drops

OK. I have one rated 5-2500 Bi-Directional, but it's GE. Is BAMF ok? If so I will pick one up and try it. Multiple calls to Xfinity and you've given me more concrete info. Thank you!

If I can end up having to call what should I mention? What should I look for after swapping out a new splitter (we need to use a splitter due to the number of drops in the the house).
Expert

Re: Constant Speed Drops

Be advised that it may not be the splitter. It may be a bad connector / fitting / too much overall line attenuation somewhere / too many splitters. And don't use a  5-2500 splitter. Those are engineered to be used with satellite systems.

 

Here are some quality brand splitters that Comcast actually uses in different market areas;

Antronix CMC2002H 2-Way Splitter: http://www.amazon.com/Antronix-CMC2002H-2-Way-Splitter/dp/B001E4OH1E

Regal 2 WAY 1 GHZ Splitter: http://www.amazon.com/DIG702867-Regal-WAY-GHZ-SPLITTER/dp/B0018BQMUM/ref=sr_1_2?s=electronics&ie=UTF...

Extreme Broadband BDS102H 2-Way Digital Coax Splitter: http://www.amazon.com/EXTREME-DIGITAL-PERFORMANCE-CABLE-SPLITTER/dp/B007YV0UQW

Holland 2-way horizontal splitter 5-1000 MHz with ground.http://www.3starinc.com/holland_2-way_horizontal_splitter_5-1000_mhz-w-ground.html

Sv-2g 2-way Splitter 5-1000mhz: http://www.amazon.com/Sv-2g-2-way-Splitter-5-1000mhz-Sv2g/dp/B003TH36CK










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