slow wifi

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Resident Expert
Resident Expert
Posts: 6,043

Re: slow wifi

@BS, you ask a couple of questions in a blog a couple of weeks ago and I haven't managed to get back to it.  Sorry for the delay.  From the sounds of it, you're not having much fun with your wifi service, for various reasons.  

 

First a question.  You asked about any issues caused by splitting the cable service for cable tv and internet.  The splitter will cause a 3 db drop for each outbound port.  If you have enough signal excess, this shouldn't be an issue.  But, if your signal levels are marginal, then yes, 3 dB could make a difference.  It all depends on where your current signal levels are.  If you have a look at the DOCSIS WAN tab in the modem, that will very quickly let you know where you stand.  Ideally, the downstream DOCSIS 3.0 levels should be around 0 dBmV with a signal to noise ratio of 36 to 40 dB.  The upstream DOCSIS 3.0 levels, if one OFDM downstream channel is showing active will be in the 30 to 32/33 dBmV range. 

 

Now, if you happen to have a cable port upstairs that is centrally located, you could install an F-81 connector downstairs to join the external cable with the single upstairs cable, and then install the splitter at the upstairs cable port to run both cable tv and internet modem from that port.  It all depends of course on what that might do to any fixed ethernet cabling.  F-81 connector looks like the following:

 

https://www.lowes.ca/coax-cable/ideal-3-ghz-f-splice-adapter-4-pack_g1200823.html?SearchTerm=85-339

 

Or, if you can manage to snake a cable upstairs so that you can relocate the modem upstairs, that might do the job as well.  For wifi purposes, bringing the modem closer to the devices results in a couple of improvements, the received signal level increases as does the signal to noise ratio.  If you look at the following Modulation and Coding charts, that pushes the data rates down the chart.  

 

http://mcsindex.com/

 

https://www.wlanpros.com/mcs-index-charts/

 

Consider each spatial stream to equal one antenna in the router.  You start at the top, with 1 out of every two data bits being used for data purposes.   The other bit is for error correction.  Down at the bottom of the single stream group (top group), you end up with 64 QAM and 5 out of 6 bits being used for data and only 1 bit being used for error correction.  The end result can be very dramatic depending on where you're starting from.  If you can manage to run anything with 5 Ghz 80 Mhz (bandwidth) channels, that will also make a considerable improvement.  

 

This doesn't solve the issue of sharing channels with the neighbours, but, it should make a considerable difference in data rates despite that channel sharing.  

 

When you have time, can you have a read thru the following post from tonight, specifically looking at the wifi settings and the wifi scanners. 

 

https://communityforums.rogers.com/t5/Internet/slow-wifi/m-p/437127#M55494

 

Just to note, TKIP can/will cause slower data rates.  From what I remember its not officially compatible with the 802.11n spec.  Understanding that you have some older devices running, that might be something to think about, slow data rates to support older devices versus retiring those devices.  

 

Something to think about is the use of the Dynamic Frequency Selection channels, which lie between the lower and higher end of the 5 Ghz band.  Those channels are shared with Weather Radar and there are requirements for the modem to monitor its active DFS channel for any Weather Radar transmissions.  If that transmission is encountered, then the modem has to evacuate that channel and go elsewhere.   Here's a link to yet another post, this one covering the DFS channels. 

 

https://communityforums.rogers.com/t5/Internet/CODA-4582-Open-Issues-for-Investigation/m-p/397331#M4...

 

Now, if you can manage to use those channels without any interference from Weather Radar, that might solve part of the problem of competing with the neighbours.  The drawback to these channels is the possibility of some devices not supporting the 5 Ghz DFS channels.  The device would appear to connect to the channel, but, it simply won't go anywhere.  You would know in a minute or two if any device is old enough or not designed to allow DFS use.  Just for curiosity's sake, I'd give that a go.  Have a look with inSSIDer Lite to determine if anyone nearby is using any of the DFS channels.  Hopefully not, then kick the 5 Ghz wifi channel into the DFS range.  

 

To do that, log into the modem, navigate to WIRELESS .... ADVANCED and enable the DFS channels.  Reboot the modem, ADMIN .... DEVICE RESET .... Reboot. 

 

After the reboot, log back into the modem and navigate to the WIRELESS .... BASIC SETTINGS and select one of the DFS channel groupings.  I think there are three to choose from.  You would have to monitor that wifi connection to see if its stable or if it changes channel due to any detected Weather Radar transmissions.  

 

So, food for thought, if you still have the 4582, and if you can manage to relocate it upstairs, you might get your money's worth out of it.  

 

Other food for thought, if you have a house with a main floor, and just the basement, you could consider a router that has external antenna.  That antenna can be replaced with higher gain antenna that limits the vertical power distribution and increases the horizontal power distribution.  Understanding the issue of budgets, with after christmas sales going on, it might be possible to pick up a router at a good price that would allow you to swap the antenna.  Just have to be careful to buy antenna that runs both 2.4 and 5 Ghz. 



I've Been Here Awhile
Posts: 2

Re: slow wifi

@Datalink
Thank you so much for your response. I have a lot of work to do now but your instructions are so very simple to understand and I’m very appreciative. I had no idea these little boxes could be so incredibly intense to set up haha. I will go through the steps and let you know how it went. After reading through 100’s of posts yesterday I’m starting to get a hang of it a little bit hahah
Thanks again
I'm a Senior Advisor
Posts: 2,149

Re: slow wifi

Thanks for the detailed description. @Datalink
I was able to set up the weather radar signals and that helped for a few locations. There was one other signal up there but very weak.

I am going to have to get off my butt and fish the cable to main floor to solve the basement problem.

I will keep everyone up to date.

One other solution I did. I moved my favourite chair to a better location.

Thanks as always for the great detail and easy to follow instructions.

Bruce
Highlighted
I'm a Senior Advisor
Posts: 2,149

Re: slow wifi

@Datalink

 

I have tried a couple of things since I last posted - I brought the gateway upstairs and connected directly from Cable outlet (disconnected cable for now without splitter)  - here are the signals pre adding cable - second set is after cable on - any thoughts - definitely, bringing to main floor made huge difference - 5g was 103.1 Mbs coming on my 75 service and 100.6 on modem to device on AC.  to my laptop which is n, not ac it was via wifi (I didn't have a cable handy to test direct cable - but download was 78.6 down and 10.2 up - very livable, suspect direct cable would have been closer to the 100 as well, but let's be real I am dealing on a lower WIFI standard of n not ac on that device.  I have 3

 

First set of signal strength - outlet was originally cable jack - 3 total splits off demark spliter (Rogers in the sealed demark box), so there are still two tv's in place at the moment. (both off, DTA and one HD box on standby).

 

Hardware Version1A
Software Version2.0.10.36T6

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1603000000256QAM2.300937.356
2849000000256QAM3.400237.636
3855000000256QAM3.400337.356
4861000000256QAM3.200436.610
5579000000256QAM2.800537.636
6585000000256QAM3.500638.983
7591000000256QAM2.800737.636
8597000000256QAM1.800837.636
9303000000256QAM0.300137.356
10609000000256QAM4.2001037.636
11615000000256QAM4.4001138.605
12621000000256QAM3.7001237.636
13633000000256QAM2.1001337.636
14639000000256QAM2.8001437.636
15645000000256QAM3.1001537.636
16651000000256QAM3.1001637.356
17657000000256QAM2.7001737.636
18663000000256QAM3.2001837.636
19669000000256QAM4.0001937.636
20675000000256QAM3.9002037.356
21681000000256QAM5.1002137.356
22687000000256QAM6.1002237.636
23693000000256QAM7.1002338.605
24699000000256QAM7.2002438.983
25705000000256QAM5.3002537.636
26711000000256QAM3.7002637.356
27717000000256QAM2.7002737.356
28723000000256QAM2.8002837.356
29825000000256QAM3.6002937.356
30831000000256QAM3.3003037.356
31837000000256QAM2.8003137.356
32843000000256QAM3.1003237.356
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K275600000YESYESYES0.599998
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM37.75016400000
238595805ATDMA - 64QAM39.75033200000
323700000ATDMA - 64QAM35.75026400000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.50000.00000.0000-inf-1.00004K
1DISABLED0.50000.00000.0000-inf-1.00004K

 

 

Signal strenth's up are high based upon your suggestions, download are all above 0 as high as 7.2, but signal strength is high on the downloads.

 

Last summer a tech did some work next door - they were installing an additional account for 2 tv's and another high end cable - GB I believe - standard digital cable - he said he had to put a booster in to meet the high demand in the home, and it may impact me and the signals may be too high and may need an attenuator - any thoughts?

 

Here is next set with TV included in mix.

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1591000000256QAM-1.100737.636
2849000000256QAM-0.700237.356
3855000000256QAM-0.900337.356
4861000000256QAM-1.200437.356
5579000000256QAM-1.000537.636
6585000000256QAM-0.300637.636
7303000000256QAM-3.100137.356
8597000000256QAM-2.100837.356
9603000000256QAM-1.700937.356
10609000000256QAM0.3001037.636
11615000000256QAM0.8001138.605
12621000000256QAM0.1001237.636
13633000000256QAM-1.4001337.636
14639000000256QAM-0.7001437.356
15645000000256QAM-0.4001537.636
16651000000256QAM-0.4001637.636
17657000000256QAM-0.5001737.636
18663000000256QAM-0.3001837.636
19669000000256QAM0.2001937.636
20675000000256QAM0.4002037.636
21681000000256QAM1.5002137.636
22687000000256QAM2.6002237.636
23693000000256QAM3.5002338.605
24699000000256QAM3.8002437.636
25705000000256QAM1.4002537.356
26711000000256QAM0.0002637.356
27717000000256QAM-1.1002737.636
28723000000256QAM-1.1002837.356
29825000000256QAM-0.4002937.356
30831000000256QAM-0.8003037.356
31837000000256QAM-1.2003136.610
32843000000256QAM-1.0003237.356
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K275600000YESYESYES-2.900002
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
123700000ATDMA - 64QAM38.25026400000
238595824ATDMA - 64QAM42.25033200000
330596000ATDMA - 64QAM40.25016400000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.50000.00000.0000-inf-1.00004K
1DISABLED0.50000.00000.0000-inf-1.00004K

 

My Tv is still in good levels, actually a bit lower, they were a bit high, as the installer suggested may happen since he boosted the whole pedestal not just the one house as they were going to be dragging down the rest of us - we have 5 homes and 6 feeds going with the double one in the house next door and a huge number of tv's in two of the houses.

 

Upload levels seem high still against what you suggested - any issue?

 

But I have real nice network connection through whole house, and I will play around to see if I still need the extender - it will have to function as an repeater for now as I don't have an ethernet feed from the living room to the rest of the house until I get a swtich in place at the patch panel.

 

But things do look better.  In long run I will fish the dedicated internet feed upstairs.  But its late, time for bed.

 

Thanks for the support and and comments on those signals is appreciated.

 

Bruce