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omberli
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Best point to point protocol

Thu Jan 07, 2021 12:17 pm

I'm about to set up a short (50m) point to point link using two 5GHz SXT sq units.
Have done this before, but mainly over long distances (1-6 km) using the nv2 protocol. It works quite well. Not sure,however, if the nv2 protocol will give the best performance for this short distance, or if 802.11 may be a better choice. Any suggestions or recommendations?

-Olaf-
 
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bpwl
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Re: Best point to point protocol

Thu Jan 07, 2021 2:01 pm

It depends on the RF signals around. With clean Line-of-sight and no interference 802.11ac will outperform nv2.
It's easy to prepare the setup to be able to switch between protocols.
Set the "station bridge" side to protocol "802.11 nstreme nv2" and prepare all security passwords.
On the "bridge" side then chose 802.11ac and check the registration for TX Rate, RX Rate and the CCQ. If CCQ is lower than 90% the signal is not clean and nv2 might help.
Otherwise try them all, and compare.
There is no need for WDS in this setup.
 
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omberli
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Re: Best point to point protocol

Thu Jan 07, 2021 3:07 pm

Thanks.
Have set ut two SXT sq units and tested the protocols.
Speed and ping seems to be almost the same for 802.11, nstreme and nv2.
On nstreme I got some disconnects with the log message: lost connection, not polled for too long. Not sure why (have not worked with nstreme before).
Seems like setting the ap to 802.11 and nv2 and have the client accept both may be a good solution.
-Olaf-
 
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Re: Best point to point protocol

Thu Jan 07, 2021 6:11 pm

Whats wrong with the Cube setup MT has........... Short distance but the throughput is phenominal and doesnt crowd the 2.4/5 spectrum?
 
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Re: Best point to point protocol

Thu Jan 07, 2021 6:17 pm

On 802.11n radios, nstreme seems to be best for p2p, high throughput and low latency. As long as channel is clean and without interference.
"lost connection, not polled for too long" means you have some interference on the channel and this really causes problems for nstreme.
nv2 is more robust, but also introduces additional latency (depending on frame length) and lower throughput (unless you set longer frame length, but then you get even more latency).

If you can find clean channel, use nstreme. If not, try nv2 if you can tolerate the extra latency.
Otherwise plain 802.11 with RTS/CTS may also be an option...
 
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omberli
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Re: Best point to point protocol

Thu Jan 07, 2021 6:24 pm

anav...
Probably nothing wrong with the Cube setup. Don't know it....
My reason for using the SXT sq is that I have several of them avilable after un-installing a few "last mile" systems recently.
-Olaf-
 
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Re: Best point to point protocol

Thu Jan 07, 2021 6:39 pm

r00t..
Thanks for explaining.
I don't know anything about interference or available frequencies unil I get on-site. Will give nstreme a try then.
In my test setup I got speeds of around 80-90 Mbit/s when connecting to an external speed test site through the mentioned link and a 100Mbit fiber access. 802.11 and nv2 gave approx. same speed. Ping is around 6-8ms.

-Olaf-
 
miankamran7100
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Re: Best point to point protocol

Tue May 17, 2022 5:35 pm

It depends on the RF signals around. With clean Line-of-sight and no interference 802.11ac will outperform nv2.
It's easy to prepare the setup to be able to switch between protocols.
Set the "station bridge" side to protocol "802.11 nstreme nv2" and prepare all security passwords.
On the "bridge" side then chose 802.11ac and check the registration for TX Rate, RX Rate and the CCQ. If CCQ is lower than 90% the signal is not clean and nv2 might help.
Otherwise try them all, and compare.
There is no need for WDS in this setup.
Dear Sir, Hope you are fine
I have a problem with Mikrotik (ptp LHG5 distance 800 meter) and (ptp SXT lite5 distance 400meter)
I'm not able to get 300Mbps speed on Bandwidth test As mention on Mikrotik website. just get result of 50Mbps on bandwidth. on tcp both
please do needful as soon as possible
 
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Ca6ko
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Re: Best point to point protocol

Tue May 17, 2022 7:31 pm

@miankamran7100
You have a problem not with Mikrotik, but with basic knowledge.
You should distinguish between useful bandwidth and full bandwidth. The devices you cited have a 100Mbps Ethernet port, so you can never get useful bandwidth higher than 95-97.
On a Fast Ethernet network, the usable bandwidth can vary depending on the size of the frames transmitted from 54.76 to 97.52 Mbps. That is, when you run traffic through your devices you will never see traffic higher than 97 Mbps.
Now about the WiFi network. What does "Wireless 5 GHz Max data rate 300 Mbit/s" mean that you read in the device description on the website? This is the maximum channel rate provided by the 802.11n standard. Depending on your setup, the available speeds can be from 1 to 4+8+16=28. You can see at what channel speed your devices are connected on the Winbox/Wireless/Registration tab
PS When measuring the bandwidth, the program generating the traffic cannot be run on the device in question. You must use devices with sufficient performance, LHG 5 and SXTsq 5 Lite devices use a processor that is able to generate TCP traffic in both directions no more than 50 Mbps and the processor load will be 100%. It seems that this is the figure you measured
 
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anav
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Re: Best point to point protocol

Tue May 17, 2022 7:57 pm

If you want to optimize throughput is why the cube was suggested. Seeing as you have other units laying around makes sense if throughput is not vital or available as source.

@miankanram - start your own thread please.
 
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Re: Best point to point protocol

Wed May 18, 2022 2:33 pm

50 Meters...

Also vote for the wireless wire line.
(Assuming a clear line of sight.)
 
miankamran7100
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Re: mikrotik wireless network ping spikes

Sun May 29, 2022 7:50 pm

Dear Sir BPWL,

Please look in this matter and suggest me solution.
I have ptp link on LHG5 (distance 600 meter). When I use bandwidth test it shows only 47 to 50mbps tx/rx. Even MikroTik say 300 Mbits on their website (product description).
facing same issue on SXTsq Lite 5 ptp link (distance 300 meter)
You do not have the required permissions to view the files attached to this post.
 
miankamran7100
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Re: Best point to point protocol

Sun May 29, 2022 8:16 pm

@miankamran7100
You have a problem not with Mikrotik, but with basic knowledge.
You should distinguish between useful bandwidth and full bandwidth. The devices you cited have a 100Mbps Ethernet port, so you can never get useful bandwidth higher than 95-97.
On a Fast Ethernet network, the usable bandwidth can vary depending on the size of the frames transmitted from 54.76 to 97.52 Mbps. That is, when you run traffic through your devices you will never see traffic higher than 97 Mbps.
Now about the WiFi network. What does "Wireless 5 GHz Max data rate 300 Mbit/s" mean that you read in the device description on the website? This is the maximum channel rate provided by the 802.11n standard. Depending on your setup, the available speeds can be from 1 to 4+8+16=28. You can see at what channel speed your devices are connected on the Winbox/Wireless/Registration tab
PS When measuring the bandwidth, the program generating the traffic cannot be run on the device in question. You must use devices with sufficient performance, LHG 5 and SXTsq 5 Lite devices use a processor that is able to generate TCP traffic in both directions no more than 50 Mbps and the processor load will be 100%. It seems that this is the figure you measured
Please look at this images
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rextended
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Re: Best point to point protocol

Mon May 30, 2022 12:42 am

-34 / -33 ?? too high,
see both cpu used when you do bandwidth test...
 
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Ca6ko
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Re: Best point to point protocol

Mon May 30, 2022 11:37 am

@miankamran7100
When measuring the bandwidth, the program generating the traffic cannot be run on the device in question. You must use devices with sufficient performance, LHG 5 and SXTsq 5 Lite devices use a processor that is able to generate TCP traffic in both directions no more than 50 Mbps and the processor load will be 100%. It seems that this is the figure you measured
.
Please look at this images
What new things do you want to hear?
These pictures show that the points are connecting at a maximum possible channel rate of 300 mbps. Which is about 200 mbps of usable bandwidth, but since the link is half-duplex it would be about 100 mbps in full duplex.
The following picture shows the maximum speed the processor can generate. Run TCP transmit or receive only and the processor will be able to generate up to 80-100 mbps of traffic, run UDP transmit or receive only and the processor will be able to generate around 180-200 mbps of traffic. It was explained to you that you do not see the bandwidth of the wifi channel, but the speed that the processor can generate.
PS To improve the performance of the wifi bridge you need to reduce the power on both sides by about 15 -18 dBm. So that the signal level is not -34/-33dB, but -50/-50dB. Because of the very strong signal you have a low CCQ.

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