@ValentynL the statement that your devices support 802.11ac is really irrelevant to the discussion of using 80 Mhz wide channels in the 5 Ghz band. You would have to know specifically if each individual device supports 80 Mhz wide channels. As that is a recent addition to the 802.11ac specs, I suspect that the vast majority of devices on the market today support at best 20 Mhz or maybe 20/40 Mhz channel widths. Blame that on cheap manufacturers. We've had that discussion several times over in the forum. Turns out that we're usually right on this one. So, unless all of your devices are perhaps one to two years old, they most likely will not support 80 Mhz bandwidths.
Two other issues come to mind.
1. If the co-channels required for 80 Mhz wide operation are not available at the target device, that device will indicate that fact to the modem and the modem will automatically step down to 20 or 40 Mhz wide channels if in fact the modem is following the rules, which it should. Each broadcast by the modem is preceded by a clear channel check at the receiving device to determine the available bandwidths. The same procedure is followed when the device transmits back to the modem.
2. I have seen devices that actually decrease the output power when wider channels are selected, so, a little research is required here to determine what CODA-4582 actually transmits for output power for the various bandwidths.
The conclusion from issues like this that have come up in the forum previously is that you can't assume. For the most part, you can blame the manufacturers for that. We've seen brand new laptops or other devices, well thought out, really expensive, except for one component, the cheap wifi card that was built in. End result, much disappointment on the part of the new owner when he or she discovers the issue.
@Double_K has raised some good points regarding wifi performance. It would be worth an experiment to test 20, 40 and 80 Mhz bandwidths to determine if in fact there is any difference in stability and range.
The range on the lower 5 Ghz channels will not be the same as on the upper 5 Ghz channels. One reason is that Industry Canada changed the output power regulations last year. From what I remember:
Old Reg:
Lower 5 Ghz channels: Power output restricted to 50 mw
Upper 5 Ghz channels: Power ouput restricted to 1 W.
New Regs:
Lower 5 Ghz channels: Power output restricted to 200 mw
Upper 5 Ghz channels: Power ouput restricted to 1 W.
So, even with the new regs, if the modem has been approved under those regs, the lower 5 Ghz freqs will not have the same range simply due to the power output at the antenna.
Note that the US FCC has approved a 1 Watt max output power for the lower 5 Ghz freqs. Canada has not followed the same path on this one.
Fwiw, here's a DSLReports thread on this same subject:
https://www.dslreports.com/forum/r30910860-Wireless-5GHz-WIFI-and-80-MHz-Channel-Width-setting
2. Now you're getting into the engineering aspects of wifi transmission. Wifi frequencies have different material penetration ranges that depend on the material and the frequency in question, not to mention the atmospheric losses as the frequency increases. I'll see if I can dig up a chart from somewhere that shows this issue.
I also ran additional tests on speedtest.net to the TELUS sever and I got a download speed of 3.59 Mbps and upload speed of 8.25 Mbps and a good ping of 6ms. I usually average 130/10 on the 100u package but these
modem reboot but it hasn't fixed anything. @RogersDave I had a support rep filed a case for me, but I was wondering if you can intervene here.
Speed problems: Ok, anyone experiencing speed issues with the new CODA-4582 modem, try this:
1. If you are running the modem in Bridge mode with an IPV6 enabled router after it, disable IPV6 in the router. Reboot the router and any connected devices so that they all operate on IPV4 only.
2. If the modem is in Gateway mode with connected devices enabled for IPV6, go into each device and disable IPV6. Then reboot the device. For pc's and laptops, navigate to Start .... Control Panel .... Network and Sharing Center. Select "Change Adapter Settings" on the left hand side. Select the appropriate adapter, ethernet, or wifi, or one after the other if required. Right click on the adapter and select Properties. Scroll down the Ethernet or Wifi Properties panel to the Internet Protocol Version 6 (TCP/IPv6) and deselect the check box. Hit Ok, close all of the open panels and applications and reboot the pc or laptop.
After the reboot, please try a speedtest using the www.speedtest.net Toronto Rogers or Beanfield server or the Montreal Rogers or Fibrenoire Internet server depending on which is closest to you.
Please let me know if this resolves the issue. IPV6 was to have been disabled in the modems, perhaps that has not occurred as of yet.
I'm on a R7000, can't seem to find where to disable IPv6 (can only set to auto), but here's results after disabling IPv6 computer side. It halved my upload speed and increased my download speed by like 50Mbps (did test before and and after disabling IPv6)
Less than 10m after the last one...
Did one on beanfield...
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