Extremely inconsistent internet speeds and latency

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Datalink
Resident Expert
Resident Expert
Posts: 7,368

Re: Extremely inconsistent internet speeds and latency

I'd say that your download / upload rates are fine.  Now for the fun.  Wifi is affected by a number of items, including interference from other routers, interference from home appliances like microwave ovens and 2.4 Ghz cordless phones,  age of the wifi mini-card which dictates whether it's running Draft N firmware or approved N firmware, single or dual antenna mini-cards, settings on the router and on the mini-card and probably a few that I haven't thought of.  Each one requires a step by step look to determine if you can do anything to fix any problems that you see.  As they say in the movies, let the games begin.  If you run into problems, we'll need details on the devices to be able to look at the specs, hopefully to determine what if anything you can do. 



lethalsniper
I'm an Enthusiast
Posts: 1,011

Re: Extremely inconsistent internet speeds and latency

Thanks. Would a 4 way splitter be better then a 3 way
Datalink
Resident Expert
Resident Expert
Posts: 7,368

Re: Extremely inconsistent internet speeds and latency

Only if you need another port for another cable.  So, if the tech installed a three way, and it is supplying everything that you need at the moment, leave it as is.  Installing a larger splitter and leaving open ports is not good policy as the open ports can result in reflected RF energy travelling back down the cable,causing interference problems.  There should never be any open ports in a cable system.  They should either be connected to a device or capped with a 75 ohm terminator which simulates the connection to a device.



dhsiung108
I've Been Here Awhile
Posts: 4

Re: Extremely inconsistent internet speeds and latency

High/Spiking Latency

 

Over the past few weeks, my internet latency has been jumping from 20ms to 300+ms. Currently it is hovering around an average of 200ms. Yesterday, I called a technician to come and check my cables. He changed my splitters and the problem was resolved for a small period of time. However, few hours later, the latency returned and now I don't know what to do. I am currently using a CGN3ACSMR modem in gateway mode. Also, I am using a laptop connected to the internet via ethernet cable. Are there any solutions to this problem?

Datalink
Resident Expert
Resident Expert
Posts: 7,368

Re: Extremely inconsistent internet speeds and latency

Is that seen on a wired or wifi connection, and is that via connection to the modem running in Gateway mode, or from a router connection, with the modem in Bridge mode?  Can you log into the modem, navigate to the STATUS.... DOCSIS WAN page, copy the Downstream and Upstream tables and paste them into this thread.  Those are the cable signal levels which might still be of interest.  And.... are you in a house, apartment, condo, highrise, etc, etc?



dhsiung108
I've Been Here Awhile
Posts: 4

Re: Extremely inconsistent internet speeds and latency

It is seen on both wired and wireless. Modem is in gateway mode and I'm in a house.

 

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 633000000 256QAM -1.900 127 32.585
2 591000000 256QAM -2.000 121 33.487
3 597000000 256QAM -1.700 122 33.063
4 603000000 256QAM -1.800 123 32.963
5 609000000 256QAM -1.900 124 32.963
6 615000000 256QAM -2.000 125 33.063
7 621000000 256QAM -1.800 126 32.963
8 639000000 256QAM -1.900 128 32.676
9 645000000 256QAM -1.600 129 32.963
10 651000000 256QAM -1.700 130 32.585
11 657000000 256QAM -1.800 131 32.585
12 663000000 256QAM -1.800 132 32.585
13 669000000 256QAM -1.600 133 32.585
14 675000000 256QAM -1.500 134 32.585
15 681000000 256QAM -1.600 135 32.585
16 687000000 256QAM -1.500 136 32.585
17 693000000 256QAM -1.200 137 32.676
18 699000000 256QAM -1.200 138 32.585
19 705000000 256QAM -1.200 139 32.585
20 711000000 256QAM -1.100 140 32.495
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID BandWidth
1 38596000 ATDMA - 64QAM 40.250 5 3200000
2 23700000 ATDMA - 64QAM 40.250 7 6400000
3 30596000 ATDMA - 64QAM 40.250 6 6400000
Datalink
Resident Expert
Resident Expert
Posts: 7,368

Re: Extremely inconsistent internet speeds and latency

Your signal levels on both Downstream and Upstream are good.  The Signal to Noise ratios aren't so good.  Call tech support and have the CSR run a signal check on the modem.  Ask him or her to check the neighborhood node as well, which is the next device upstream that the modem communicates with.  The signal check should probably indicate bit errors which are at or maybe slight over the acceptable level.  Call tech support when you are seeing high ping times so that hopefully the errors can be detected during the signal check.  There is either an issue at the node, or an issue that is still affecting your cabling and connectors.  Keep calling tech support as many times as you have to in order to document the issue.  The more reports on file, the sooner it will grab someone's attention.  Please keep us informed of your progress with tech support. 

 

If you're interested at all in the nitty gritty details involved in the Signal to Noise ratio calculation, have a look at the following pdf link, bottom of page 26 to the top of page 29. 

 

https://www.broadcom.com/collateral/wp/CMTS-WP101-R.pdf

 



dhsiung108
I've Been Here Awhile
Posts: 4

Re: Extremely inconsistent internet speeds and latency

Okay, I'll keep you updated on the situation. Thanks for the help.

Datalink
Resident Expert
Resident Expert
Posts: 7,368

Re: Extremely inconsistent internet speeds and latency

I would expect another tech visit fairly soon.  With that done, and no progress, I'll get you to contact @CommunityHelps.   But, first, let tech support and the field techs do what they have to do.



dhsiung108
I've Been Here Awhile
Posts: 4

Re: Extremely inconsistent internet speeds and latency

Currently, the ping issue is resolved and I am having no problems. Thanks for the support.