I hope that someone is around who could tell how to interpret the available settings for
- /interface wireless: channel-width
- /interface wireless: skip-dfs-channels (10min CAC, all)
- /caps-man configuration: control-channel-width
- /caps-man configuration: extension-channel
- /caps-man configuration: skip-dfs-channels (only on/off)
- (legacy, properiatry) turbo mode
I have gone through many documentation, blogs, tutorials and forum post.
This is what I have so far, may you can help to fill the missing parts?
- turbo mode is an MT proprietary mode but not used anymore although Ubiquiti says, it is part of 802.11a but I cannot find anything more specific. Is there adequate information on this turbo mode available?
My sources:- 802.11a Turbo/Airgrid a/n 40mhz compatibi*ty | Ubiquiti Community
- RouterBOARD Wireless Hacks, MUM 2010 China and RouterBOARDNew and Improved Wireless with Nstreme Version 2 by David Savage, MUN 2011 Austra*a mention a turbo mode in 802.11a/b/g as well, most *kely based on WiFi Atheros Proprietary Turbo ModeInsider - Turbo Mode (wifi-insider.com)
- Wireless Tips and Tricks for RouterOS v6, MUM South Africa 2013 says, that 40Mhz Turbo mode is legacy and supported anymore at new 802.11 standards. I guess the mentioned 40Mhz Turbo mode is the same as the turbo mode mentioned in the referenced MUMs above.
- 5GHz-turbo - MikroTik and 5ghz vs 5ghz turbo - MikroTik tells me it was used once but not technical details
- capsman 2.4Ghz 40Mhz Turbo hAP *te? - MikroTik touches Turbo Mode but does not explain it fully
- secondary channel is 80MHz+80MHz to get 160MHz but there is XXXXXXXX, eeeeeeeC and Ceeeeeee as well, so what is the difference?
I guess that the latter only uses adjacent channels but the former uses two times 80MHz within the allowed frequency range. That means it could be #1_80Mhz: 5170 - 5250 (CH. 42) and #2_80MHz: 5490-5570 (Ch. 106), correct?
My sources:- 160MHz support for US RB4011 - MikroTik but only talks about the support fi 160MHz wide channel and 80+80MHz.
- Secondary Channel - MikroTik says
what support my theory but says as wellsupports (non-contigous) 80+80 MHz
Any idea how CAPsMAN uses this setting?Capsman is different beast and secondary-channel setting is used differently. - Secondary-channel? - MikroTik, but only a little history on ROS and 80+80MHz
- Diversity of Channel Width configuration
I am a bit confused about the various options available in CAPsMAN, but the smaller number of options on the actual /interface.
It is clear to me that CAPsMAN shall support the configuration possible of any MT devices, where /interface list only options supported by the actual hardware.
To ensure that I get it right the following is correct?- 20/40/80 means
as mentioned in WiFi 20 MHz or 40 MHz: how to choose the bandwidth | BitFeed.com?“Auto 20/40”, the router will use the 40 MHz only if the neighbouring channels are only “free”, otherwise, it will use 20 MHz in order not to damage the neighbours. - Control Channel Widht 40MHz turbo means that the minimum channel width is 40 MHz, devices that use only 20 MHz cannot connect?
- Combining Control Channel Widht 40MHz turbo and Extension Channel XXXXXXXX will limit maximum channel width to 160 MHz, it won't throw a misconfiguration error?
It is all a bit confusing as said hereThe "20/40MHz Ce" setting is confusing, should be "20MHz Ce/40MHz" - If the AP is set on 20/40/80 and can operate at 80 MHz channel width and being connected to modern and legacy devices, only the connection to the legacy devices is downgraded to eg. 20 MHz, the modern devices stay at 80 MHz, as indicated in DD-WRT Forum :: View topic - Dynamic (20/40 MHz) vs Wide HT40 (40 MHz)?
Unfortunately, the following in 802.11n force 40mhz channel - MikroTik doesn't distinguish between all clients and individual clients:When transmissions fail, the transmitter will step down the number of streams, MCS rate, and channel width, ..... until it works, or it totally fails = disconnect. - If a legacy client is connected, what can use only 20 Mhz channels, other c*ents connected to the same AP still can communicate at 40...160 MHz.
The reason why it can still have a significant impact on the overall throughput are:- actual data (goodput) is only a small portion of the traffic, there is a lot of administrative overhead (TACK: Improving Wireless Transport... is a good read), even for only maintaining a connection in a router, see Is it true that wifi speed slows down when there are several devices connected to it? - Quora.
- It consumes more airtime/time per "serve-all-clients" cycle, as per friction fewer data can be transmitted, so the AP spends more time on the legacy device, to avoid that packages get lost.
If this exceeds a certain limit other devices will suffer, as they cannot make use of the full bandwidth available to them if all devices would operate on the newest standard.
It is discussed on Super User and Super User - If only legacy devices connected to the AP, reserved channels for e.g. 160 MHz are wasted, as they are not used, even by others AP (unless you implement channel sharing).
- 20/40/80 means
- how to avoid misconfiguration through CAPsMAN
Is there any possibility that MT devices fall back to a default configuration if the provisioned configuration is not supported by a device like configuring fixed 40 MHz channel width?
- country info interpretation
why do I have almost the same ranges with the same settings, 5170-5250 vs. 5170-5330 vs. 5250-5330?
How do I read the lines?- frequency ranges are available depending on the selected band (a, an, ac, b...)?
- certain ranges are available if installation is either set to indoor/any or outdoor/any?
- 20, 40 etc. tells maximum channel width and dfs is active where dfs is mentioned that is clear
- how can passive communication work if all devices in a range are passive?
.Code: Select all/interface wireless info country-info switzerland ranges: 5730-5790/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(23dBm)/outdoor 5820-5870/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(23dBm)/outdoor 2402-2482/b,g,gn20,gn40(20dBm) 2417-2457/g-turbo(20dBm) 5170-5250/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(23dBm)/passive,indoor 5170-5330/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(20dBm)/dfs,passive,indoor 5250-5330/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(20dBm)/dfs,passive,indoor 5490-5710/a,an20,an40,ac20,ac40,ac80,ac160,ac80+80(27dBm)/dfs,passive 5190-5310/a-turbo(20dBm)/dfs 5180-5300/a-turbo(20dBm)/dfs 5520-5680/a-turbo(27dBm)/dfs,passive 5510-5670/a-turbo(27dBm)/dfs,passive 902-927/b,g,g-turbo,gn20,gn40(30dBm)
. - indoor / outdoor / any / leave empty (defalistt): #13 and #14 hAP AC Lite - Missing a lot of channel - MikroTik
In a nutshell
.Don't use installation "indoor". Use installation "any" if it is indoors. This will include the outdoor allowed frequencies
...
Not entirely correct. "indoor only" mode is for outdoor type devices. -
Avoid weather channels as said in #13 hAP AC Lite - Missing a lot of channel - MikroTik is easily said when you are located in a regulated region, such as Canada. It is a different story if you are located in the EU (and non-EU countries in Europe) despite the fact that the ETSI is trying to harmonize standards for Information Communication Technology (ICT) enables systems globally.
In regard to CH, I find Harmonised frequency ranges (admin.ch) and Swiss National Frequency Allocation Plan and Specific Assignments wherein it is said
So, there colistd be weather radars using higher frequencies but you can assume you are safe if you use <=5580/CH.116 and/or >=5700 MHZ/Ch.140 (centre frequency) to avoid The 5GHz “Problem” For Wi-Fi Networks: DFS (wifinigel.blogspot.com) / How does DFS affect mobi*ty? | Wi-Fi Al*ance .5420 - 5478 MHz: Ground-based weather radars in CH.
...
5600 - 5650 MHz: Preferred band for ground-based weather radar in Europe.
Good background read: Recommendation on C-Band Meteorological radars design to ensure global and long-term coexistence with 5 GHz RLAN | EUMETNET.
BACKGROUND INFORMATION
[*]Additional Resources:
- What are IEEE 802.11 Standards? : 802.11a/b/g/n/ac/ax (signalboosters.com) historical order of 802.11 evolvement plus short comments to each release
- List of 5 GHz WiFI channels for EU - MikroTik don't use channels 144-165 only for RD (Short Range Devices) but What are Short Range Devices (SRD) | ETSI, so ok for home APs
- dup*cated CAPsMAN documentation: CAPsMAN - RouterOS - MikroTik Documentation and Manual:CAPsMAN - MikroTik Wiki
- Understand Wi-Fi 4/5/6/6E (802.11 n/ac/ax) (duckware.com) is a very good summary of current wireless route/AP technology
- WLAN Frequency Bands & Channels - CableFree & List of WLAN channels - Wikipedia
- What is the MCS Index? | NetBeez
- MT's history of 802.11n - MikroTik
- What Do 802.11n's Optional Features Mean For You? - SmallNetBuilder - Reslistts from #1
- What I’ve learned from nearly three years of enterprise Wi-Fi at home | Ars Technica
- Introduction to 802.11ax High-Efficiency Wireless - NI technical details well explained
- Bandwidth and Throughput in Networking: Guide and Tools - DNSstuff
- 802.11ac Migration - Part 2: What Nobody's Tel*ng You About 80MHz and 160MHz Channel Bonding (7signal.com) best channel selection depending on channel width
- When to Use 20mhz vs 40mhz vs 80mhz (quickstart.com)
- Wi-Fi auto channel select & N-only - MikroTik tries to explain 20/40 dynamic rate vs. fixed 40 MHz rate but does not take into account being "neighbour friendly" un*ke in Sholistd I enable/disable 20/40 MHz Coexistence? : orbi (reddit.com)
- 4. 802.11 Framing in Detail - 802.11 Wireless Networks: The Definitive Guide, 2nd Edition [Book] (oreilly.com)
- 802.11 Frame Types and Formats – How I WI-FI (howiwifi.com)
- QCA wireless settings - DD-WRT Wiki / Basic Wireless Settings - DD-WRT Wiki good explanation on channel topics
- 5 GHz Channel Planning
- Channel Planning Best Practices for Better Wi-Fi - Ekahau
- Wireless eC, Ce or XX - MikroTik
- Channel overlap 802.11ac - MikroTik
- List of WLAN channels - Wikipedia
- WLAN Frequency Bands & Channels - CableFree
- List of 5 GHz WiFI channels for EU - MikroTik
- Channelization & OBSS Impact | Dumping ground for wireless, route, switch stuff. (mikealbano.com)
http://www.mikealbano.com/2015/10/chann ... mpact.html - Channelization & OBSS Impact | Dumping ground for wireless, route, switch stuff. (mikealbano.com)