Duplicating SR71-A miniPCI MIMO

RouterOS Wireless Networking
1

We are trying to duplicate SR71-A miniPCI MIMO test results found at http://www.ubnt.com/wiki/index.php/SR71. Using the base configuration with a few modifications.

band: 2.4ghz-onlyN
frequency: 2412 MHz
ht-ampdu-priorities: 0
ht-guard-interval: any
ht-extension-channel: above-control
ht-txchains: 0-1-2 (all chains)
ht-rxchains: 0-1-2 (all chains)
tx-power: 1 dB, Card Rate (due to short distance, setup a low power to prevent radio saturation…)

Test were performed between two indoor (about 5 m distance) devices with
RouterOS to v4.0beta3
2 x RB433AH
2 x SR71-A miniPCI MIMO Radio Module
6 x antenna omni 5dBi on MMCX pigtail (3 on each setup)

Can anyone explain why only getting 20 to 25Mbs bandwidth?
How can you tell if your setup is using 20Mhz or 40Mhz wide channels?
Also not sure why we are not getting 300Mbs/300Mbs as displayed in the SR71-A miniPCI MIMO test.

Image attached…
mimo.jpg

2

First of all TCP bandwidth test is not a good idea. It only makes one TCP stream which is hardly anything close to real life. You must use either the new Bandwidth test version that has multiple stream support, or use UDP test.

Second, you are testing from one wireless router to the other. The test generates random data to be sent, and this random data generation eats up all your resources. Do the test like this from one PC to other PC so that the link is in the middle:

[powerful pc 1] -====> [wifi1] ~802.11n~[wifi2] ====== [powerful pc 2]

3

Do the test like this from one PC to other PC so that the link is in the middle:

[powerful pc 1] -====> [wifi1] ~802.11n~[wifi2] ====== [powerful pc 2]

How should we accomplish the PC to PC connectivity through [wifi1] & [wifi2]?

Link: Transparently Bridge two Networks or another method?

Plesae give details if possible.

Thanks

4

depends on how you want to setup your network, there are many ways

5

Do the test like this from one PC to other PC so that the link is in the middle:

[powerful pc 1] -====> [wifi1] ~802.11n~[wifi2] ====== [powerful pc 2]

Today we tried Transparently Bridge two Networks

Problem: Bandwidth between PC1 and PC2 was only 12mbs using Iperf Tool for testing bandwidth.

We get 45mbs when using 4.0beta4 bandwidth tester between wlan1 and wlan2.

I looked at:

Transparently Bridge two Networks without using WDS (EoIP)

But Mikrotik documentation says EoIP is 10-20% slower than WDS.

Before submitting this reply I found the following which looks promissing.
Transparently Bridge two Networks using MPLS

Can you suggest any other bridging or connectivity methods that will will produce higher bandwidth results?

We were hoping to get 80-110mbs between PC1 & PC2.
Is this expectation realistic for 433AH router boards & SR-71A radios?

Thanks

6

that note was only for Rb500, it’s not true anymore in new RouterOS versions. Use EoIP

7

We appreciate your replies thus far. Some references to Nstreame state functionality not really activated. We have upgraded to 4.0beta4.

Should we enable NStream? If so, what settings to you recommend?