hi everyone
I have a sector antenna connected with mikrotik rb912 ( using as ptmp) .I have a question about a data rate settings of the rb access point .the question is /
if I set the data rate on it's default value ,is that will mean that every client station will recieve all the traffic which bocoming from ISP ?
if I set the data rate on 6mbps , is that mean that every client station will receive just 6mbps from ISP ? . or let us to say that the 6mbps will divide on the sum of the clients that connected with the access point ?
with thanks and appreciation for you .

STRANGE !!!!
244 views ,but no one could help me to get the answer !!
let me explain the subject more in detail > you have two towers .each of them have sector antenna+rb912 .the only difference between them is in the wireless data rate settings :
tower 1 wireless data rate settings put it on it's default value
tower 2 wireless data rate settning put it on just with 6mbps value
the question is / is the tower1 sends all the traffic band data which coming from ISP ?
is the tower2 sends just 6mbps to any client station ?or maybe the value 6mbps divide on the number of the client stations ?





I'll be very grateful to everyone can help to get the answer

tower 1 wireless data rate settings put it on it's default value
tower 2 wireless data rate settning put it on just with 6mbps value
the question is / is the tower1 sends all the traffic band data which coming from ISP ?

First thing i would like you to do is read the following thread: viewtopic.php?t=50216
Some people explain really well what APs do when data rate is set to default, and what basic and supported rates mean.
This thread should answer your first three questions.

is the tower2 sends just 6mbps to any client station ?or maybe the value 6mbps divide on the number of the client stations ?

If you set your AP to work on only (let's say) 6mb/s, the max speed you can achieve to and from that same AP is 6mb/s.
That means if you have 2 clients on that AP and both are downloading something, together their max down speed is 6mb/s (without looking at overhead to make it simple), or should i say each one of them gets 3mb/s (although the exact division doesn't need to be, and usually isn't 50/50, but the core principle is there).

thank you very much .
indeed , I confess that I don't have any idea about the thread which you mentioned !!
but lemme say you something
I didn't give an entire conception for my question such as /
1- what is the BAND MODE ? is it A ,N or AN MODE?
2- what is the channel width ?
3- what is the HTMCS values that I realy use in N BAND MODE?
anyway, thanks for all

Just my 5 cents. What I have understood about 802.11 a/b/g/n/ac , and its working.

Basic rate: this transmission is not checked with a received ACK from the other side. The rate must be chosen to allow for a guaranteed delivery.
AP's send their capability and SSID information as beacons. Mostly every 100ms. These beacons are necessary for the clients to negotiate supported rates and encoding. (Among other things)
Clients send probes to find AP's that are not broadcasting their SSID
Broadcast and multicast traffic is sent at basic rate.
The association/ disassociation and values of the connection are sent at basic rate.
RTS/CTS and other control packets are sent at basic rate

So for "Basic rate" one has to choose the highest possible rate but still maintain 100% delivery to all stations.

Supported rates: are the possible usable rates for ACKed unicasts. They may fail. The "hw_retries" attempts will be made to still deliver it. If this fails the transmission is stepped down to next lower common supported rate. Again "hw_retries" times retry until it is delivered. If it fails again then we step down again. If we are at the lowest supported rate and it fails , we try 2 more time ( 3 x hw_retries in total). If it still failed, then the "Disconnect Timeout" timer starts. During this disconnect timeout we will retry every "On fail retry time". If it still fails there is disconnect.
If it succeeds we go on with the next packet. If it succeeds 3 times in a row (not sure about this number 3 ) we step up to the next higher common supported rate.
This dynamic rate state is recorded per station in the AP, for TX and RX. (See the "wireless registration" TXrate and RXrate for these live values in the AP, or in the status of the wlan in the station)

This all is the basis for setting the advanced parameters in MKT (HW_retries, Disconnect timeout, On fail retry time)

But at the rate settings be careful !
There are different sets.per 802.11 generation, and sometimes we set things like b/g/n, a/n/ac, g/n/ac, n-only, g-only mode. The mixed modes are tricky because they not only use more rate sets but also for n use other packets if "mixed" versus "greenfield". Also these higher modes are downward compatible.
The rate sets used are:
- special set from 1-11 Mbps for "b"
-set from 6 till 54 Mbps for "a" and "g"
- HT MCS rates for "n"
-VHT MCS rates for "ac"
You can configure it, or set it to default. If set to default the tick changes while in config are not used, but the default ones. (Needs to be checked if the implementation is that way or not).

MCS0 corresponds to 6.5 Mbps. It rises up to MCS7, then MCS8 is MCS0 on 2 spatial stream .... etc etc (http://mcsindex.com/)
802.11n lets us play a lot with supported and basic rates. Removing higher rates for stability is common practice. Removing lower rates is tricky, as it will introduce more disconnects.(See earlier rate selector algoritm) What do you prefer, slowing down due to an interference burst or poor temporary condition and recover, or lose connection ?
I did not figure out the "basic rate" selector algoritme yet for MKT, if there is more than one basic rate. (Wireshark could tell)

"ac" uses VHT MCS rates , but they greatly reduced the 802.11 overhead by limiting the room to play. The rate announcement data has now only a small space in the beacon to send this. The only values are , one per chain, "None/MCS 0-7/MCS 0-9" The selection panel only comes visible when "configured" is activated, and on an "ac" capable wlan. Removing lower rates is clearly not possible nor wanted.

My thanks and appreciation for Mr.bpwl.
I guess you depend on some specific values ( perfect standards) in your work .but let me assure you, that in some cases especially ( when you find out that your tower is among 100 towers arround your one) ,you must change these values to get the optimal wireless link between you and the clients.

My thanks and appreciation for Mr.bpwl.
I guess you depend on some specific values ( perfect standards) in your work .but let me assure you, that in some cases especially ( when you find out that your tower is among 100 towers arround your one) ,you must change these values to get the optimal wireless link between you and the clients.

Hi, I only have given the default values for most settings. Picking the right ones in your case is your job. Too many personal preferences are in play to do it for somebody else. Knowing the way it works helps to make effective choices.

If you have a lot of competition around, then indeed you need to adapt. Pumping up the power is tempting but not effective and illegal. Not effective because the 802.11 makes everyone very polite. If you hear somebody (even at wispher level) you wait. But 2.4 GHz has numbered its channels for 5 MHz bandwidth, and a lot of bad coexistence settings are the outcome.

Other things than allowed frequencies and TXpower are not legally limited. You still have the HW_Protection_mode, Adaptive noise Immunity and Noise floor threshold.
But the most powerful escape mode with Mikrotik is using Nstreme or NV2.

But I only wanted to answer on "is the tower2 sends just 6mbps to any client station ?" Not with yes/no because that is too little for an answer, and not my style.
To give the answer away: If you run also "n" protocol, then the answer is probably 'no' as you didn't show the MCS selections, and that are the ones that would be used.