WiFi_router.md: Separate notes and instructions

CommonInitScripts/WiFi_router.md

@@ -13,19 +13,11 @@
     1. 5G Advanced Network Settings:
         1. (IMPORTANT!!!) **Set "Channel width" to "Auto 20/40/80".**
         1. Set the 5GHz **"channel" to fixed 100** (see: <https://en.wikipedia.org/wiki/List_of_WLAN_channels>) if it is not interfering with a neighbor's WiFI (use this Android WiFi analysis tool to investigate <https://play.google.com/store/apps/details?id=com.vrem.wifianalyzer&pli=1>).
-            1. Note1: Channel 100 is a good choice because it usually has fewer devices on it than lower channels do and it has enough channels above (channels 100 - 116) for a continuous 80MHz channel width.
-            1. Note2: Slovak weather radars are on channels 120 - 130, see: <https://www.shmu.sk/sk/?page=2037>, hence the full 160 MHz bandwidth might be problematic in Bratislava, as both the Bratislava Airport and SHMU radar station Malý Javonrík (channels 120-124, 5605 MHz) are in 10km radius, but 80 MHz bandwidth fits well without interfering.
-            1. Note3: Due to frequency regulations, it takes around 12 minutes until the Wi-Fi network is available after the router is restarted (because channel 100 and channels around it use the DFS algorithm https://en.wikipedia.org/wiki/Dynamic_frequency_selection).
-            1. Note4: If channel 100 is busy (more than 2 access points on it), alternatively channel 36 with 160 Mhz bandwidth, or channel 52 with 80 MHz bandwidth can be used also (not many other options for 80MHz bandwidth with this router).
-            1. See: <https://www.reddit.com/r/HomeNetworking/comments/18zoroy/best_of_dfs_channels/>
         1. (recommended for smaller flats - OPTIONAL) Turn off "Band Steering" on 5 GHz WiFi. <https://www.devolo.global/glossary/band-steering>
         1. (recommended) Turn on "Airtime Fairness"
     1. "Wi-Fi Coverage Management" -> "Select a policy to synchronize Wi-Fi parameters to the newly detected external AP." -> "Do not enable automatic synchronization." (TODO this is probably not necessary)
 1. Test the connection speed and stability from multiple rooms in the flat + multiple devices.
 
-
-TODO - consider using band steering and a single SSID...  
-
 ## Device config (Android phones, PCs, laptops, ebook readers, smart watches...)
 
 ### Smartphones, laptops, ebook readers and PCs
@@ -36,21 +28,35 @@ TODO - consider using band steering and a single SSID...
 
 ### Smartwatches and slower/older devices
 
-1. Only connect to 2.4GHz WiFi
-2. Manually check that 5GHz WiFi is not saved and auto-connect off for 5GHz.
+1. Only connect to 2.4 GHz WiFi
+2. Manually check that 5 GHz WiFi is not saved and auto-connect off for 5 GHz.
+3. Note: Try to move as many non-critical devices to 2.4 GHz WiFi as possible, as it will improve the reliability of the 5GHz WiFi.
+
+
+### Laptops and PCs
+
+1. Laptops and PCs should primarily be connected to the router via an Ethernet cable (ideally shielded CAT6 to future-proof). That will also make the WiFi network more stable for mobile devices.
 
 ... Test the connection speed on all devices in multiple rooms of the flat.
 
 
 Note: Currently I've measured the speeds in all rooms with 2.4GHz and 5GHz WiFi, and 5GHz one is quicker, less congested and more stable everywhere in the flat (3 room apartment in Petrzalka). Also, the 5GHz connection/signal is lost quicker when I leave the house, hence it shortens the glitch while switching to a mobile network (e.g. LTE) while having an online call/meeting and leaving the flat.
 
-## Additional materials:
+## Notes, explanations, and additional materials:
 
 ### Basic info
 
 1. <https://www.intel.com/content/www/us/en/support/articles/000058989/wireless/intel-killer-wi-fi-products.html>
 2. <https://www.ekahau.com/blog/channel-planning-best-practices-for-better-wi-fi/>
 
+### Bandwidth
+
+1. Channel 100 is a good choice because it usually has fewer devices on it than lower, non-DFS channels do and it has enough channels above (channels 100 - 116) for a continuous 80MHz channel width. DFS has roaming issues on multi-AP networks but that is a non-issue when using a single router.
+1. Slovak SHMU weather radars are on channels 120 - 130, see: <https://www.shmu.sk/sk/?page=2037> and <https://www.shmu.sk/sk/?page=1566>, hence the full 160 MHz bandwidth on channel 100 is usually unstable in Bratislava, as both the Bratislava Airport and SHMU radar station Malý Javonrík (channels 120-124, 5605 MHz) are in 10km radius. 160 MHz bandwidth would theoretically be also possible on channel 36 but that band usually has a lot of interference from neighboring WiFi routers in apartment buildings in Bratislava. 80 MHz bandwidth on channel 100 usually fits well without interfering and is quick enough for the usual use case (~450Mbps).
+1. Due to frequency regulations, it takes around 12 minutes until the Wi-Fi network is available after the router is restarted (because channel 100 and channels around it use the DFS algorithm <https://en.wikipedia.org/wiki/Dynamic_frequency_selection>).
+1. If channel 100 is busy (more than 2 access points on it), alternatively channel 36 with 160 Mhz bandwidth, or channel 52 with 80 MHz bandwidth can be used also (not many other options for 80MHz bandwidth with this router). But this setting needs to be tested during a span of multiple days with <https://www.speedtest.net/>.
+1. See: <https://www.reddit.com/r/HomeNetworking/comments/18zoroy/best_of_dfs_channels/>
+
 ### DFS nuances (channels other than 36-48 in SVK)
 1. <https://mac-wifi.com/why-i-dislike-dfs-channels-and-you-might-too/>
 2. <https://news.ycombinator.com/item?id=34134905>