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Just how fast is NV2? Here's a chart.

Posted: Sun Sep 01, 2019 2:49 am
by qamtester
I've really been wanting to answer the question how fast is NV2 compared to 802.11 advertised speeds? I've built a lab and tested this out with 1 AP and 2 clients. Client1 and the AP are on the network, and Client2 and the AP are on the network. I then setup a udp traffic generator to go from Client1 to Client2 across the wireless network that the AP provides. I maintained CCQ percentages above 95% through my whole tests. Here are the results below with all devices running RouterOS 6.45.5 with upgraded firmware. All tests were conducted with Groove52HPnD on the 20MHz 5ghz channel (1:1x1 data stream using 802.11n hardware). As new RouterOS versions come out, I'll add new charts. I also used a pre-shared key for security to demonstrate the expected performance hit of encrypting your wireless traffic (you should turn this on). I also enabled AP and clients noise immunity, and I used dynamic downlink 50%. Results below, shown in Mbps aggregate.
HT MCS    Modulation    802.11n Reported Rate    NV2 Period Auto    NV2 Period 2ms    NV2 Period 3ms    NV2 Period 4ms    NV2 Period 5ms    NV2 Period 10ms
0         BPSK 1/2      7.2                      5.2                4.8               5.2               5.4               5.6               6
1         QPSK 1/2      14.4                     11.2               9.6                                                                     
2         QPSK 3/4      21.6                     17.2               14.6                                                                    
3         16-QAM 1/2    28.8                     23.2               19.6              22                23.2              24                25.2
4         16-QAM 3/4    43.3                     35.2               29.6              33.2              35                36.2              38.4
5         64-QAM 2/3    57.7                     47.2               39.6                                                                    
6         64-QAM 3/4    65                       52.8               44.8                                                                    
7         64-QAM 5/6    72.2                     59                 50.4              56.2              59.2              60.6              63.6

Re: Just how fast is NV2? Here's a chart.

Posted: Sat Sep 21, 2019 11:25 am
by purplecloud
Interesting! Thank you for putting in the time and effort to analyze and share it with us!

Re: Just how fast is NV2? Here's a chart.

Posted: Thu May 14, 2020 5:07 am
by TomjNorthIdaho
The wireless protocols ( 802.11 & nstream & nv2 ) each have their advantages.

802.11 ;PROs , compatibility with just about everything
802.11 ; PROs , great for point-to-point Mikrotik WDS links and probable the fastest protocol for point-to-point ( one AP and one client )
802.11 ; CONs , horrible throughput in noisy environments. Example a mountian top AP with 30 far-distant clients where there is rouge noise every where
802.11 ; PRO and CON , prior to sending the transmitter needs to first listen and make sure the channel is clear ( if the channel is not clear then it waits ). This waiting can slow down all thorughput when there is an AP with many remote distant clients.
802.11 ; CONs , subject to over the air collisions which thus creates retries

nstream ; a polling protocol - The AP will tell each client when it can transmit. Solves some of the problems with 802.11

nv2 ; PROs , best for APs with many clients in noisy environments
nv2 ; PROs , no collisions between AP to clients and no collisions between any two clients transmitting at the same time :)
nv2 ; CONs , nv2 is a Mikrotik hybrid-custom TDMA protocol and is not compatible with non-Mikrotik devices
nv2 ; PROs , nv2 ( TDMA ) adjustable/tuneable time-slots can be tuned from a 50/50 ratio ( 50 percent of the time in AP transmit mode and 50 percent of the time in AP receive mode ). I normally use a 75.25 nv2 ( TDMA ) ratio where the AP is configured for 75 percent of the time to be in transmit mode and only use 25 percent of the time to receive. Almost all Internet clients receive ( download ) far more data than they send ( upload ). So for an AP with many nv2 clients , this works out well to allow more data to cutomers.

I have thousands of Mikrotiks in my networks and all of them are nv2 --- with the exception that I use 802.11 for point-to-point WDS links.

North Idaho Tom Jones