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Wireless Bridge Reccomendations

I have a client with two buildings each on different sides of a road. I need to setup a wireless bridge setup to extend the LAN to the other building. I need the setup to be basically as fast and reliable as the current 10/100 LAN of the main facility. We currently have CIsco SF300 managed switches in both buildings.

 

There is currently a wireless bridge setup using some lower end equipment. The connection works ok with 2 people using it but once 3 people connect it gets really slow and basically unusable.

 

The locations of the two access points would be about 150-200 feet apart. Both would be mounted externally most likely in a weather proof access point enclosure. 

 

Thanks for any help

Moderator

Re: Wireless Bridge Reccomendations

Take a look at the MST200.  This is part of our AirMesh Outdoor AP family and are ruggedized / fully sealed so no enclosure is needed.  They are autonomous APs (no controller) and have a built-in, high-gain / directional antenna. They are single-radio 5GHz and are perfect for a P2P bridge link.

Super Contributor II

Re: Wireless Bridge Reccomendations

I tested the MST200 bridge link at around 250 metres and the results were pretty poor - when we raised this with Aruba we were told that the link is designed for Km distances and that was the reason for the low link speed.

ed
Contributor I

Re: Wireless Bridge Reccomendations

I have used the MST200 at a site where the buildings are about 330 Meters apart.  I configured the connection to use a 20Mhz channel width and receive a connection at 130Mb/s.  I could have used the 40Mhz width but using the 20Mhz allowed for me to configure using a channel with less interferance.  The far end does not have much of a load and is supporting VOIP connections to the far building as well as their internet connection. 

Moderator

Re: Wireless Bridge Reccomendations

250 meters should have worked just fine with the MST200. The predicted throughput should be: HT20 TCP down 47 – 95Mbps, -59dB         HT40: TCP down 82-164Mbps, -59dB. 

 

On really short links you may need to decrease the Tx power but at 250 meters that should not be necessary.

 

Could there have been: lot's of interference, problems with clear LoS, or impingement in Fresnel Zone?

Super Contributor II

Re: Wireless Bridge Reccomendations

We tested this out in the middle of nowhere so there would have been no interference and clear LoS, however for Fresnel zone impingement - I didn't make any calculations for this. The APs were fitted about four metres up on tripods - but I cant believe this would account for speeds of around 30Mbps.

Aruba Employee

Re: Wireless Bridge Reccomendations

What RSSI value are you getting on the mesh link from both sides?
ed
Contributor I

Re: Wireless Bridge Reccomendations

Here is what I am getting on the MST200 that I have in production. Distance of APs is around 330 Meters

 

Link quality: 82%, Data rate: 130M, RSSI: 48, SNR: 48,
Input rate: 36.49 Kbps, Output rate: 13.16 Kbps.

Aruba Employee

Re: Wireless Bridge Reccomendations

Thank you! Matt, could you share your results as well?
Super Contributor II

Re: Wireless Bridge Reccomendations

This is all I have kept from those tests -

bin/iperf.exe -s -P 0 -i 1 -p 5001 -f k
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------

20MHZ test 1 -

[236] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49382
[ ID] Interval       Transfer     Bandwidth
[236]  0.0- 1.0 sec  1784 KBytes  14618 Kbits/sec
[236]  1.0- 2.0 sec  1880 KBytes  15404 Kbits/sec
[236]  2.0- 3.0 sec  1880 KBytes  15404 Kbits/sec
[236]  3.0- 4.0 sec  1904 KBytes  15594 Kbits/sec
[236]  4.0- 5.0 sec  1928 KBytes  15795 Kbits/sec
[236]  5.0- 6.0 sec  1920 KBytes  15726 Kbits/sec
[236]  6.0- 7.0 sec  1969 KBytes  16126 Kbits/sec
[236]  7.0- 8.0 sec  1984 KBytes  16249 Kbits/sec
[236]  8.0- 9.0 sec  1928 KBytes  15793 Kbits/sec
[236]  9.0-10.0 sec  1904 KBytes  15600 Kbits/sec
[236]  0.0-10.1 sec  19208 KBytes  15633 Kbits/sec




20MHZ test 2 -
[240] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49383
[ ID] Interval       Transfer     Bandwidth
[240]  0.0- 1.0 sec  1729 KBytes  14163 Kbits/sec
[240]  1.0- 2.0 sec  1880 KBytes  15398 Kbits/sec
[240]  2.0- 3.0 sec  1904 KBytes  15601 Kbits/sec
[240]  3.0- 4.0 sec  1871 KBytes  15329 Kbits/sec
[240]  4.0- 5.0 sec  1896 KBytes  15532 Kbits/sec
[240]  5.0- 6.0 sec  1896 KBytes  15532 Kbits/sec
[240]  6.0- 7.0 sec  1912 KBytes  15662 Kbits/sec
[240]  7.0- 8.0 sec  1937 KBytes  15864 Kbits/sec
[240]  8.0- 9.0 sec  1936 KBytes  15863 Kbits/sec
[240]  9.0-10.0 sec  1935 KBytes  15855 Kbits/sec
[240]  0.0-10.3 sec  19408 KBytes  15506 Kbits/sec




20MHZ test 3 -
[228] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49384
[ ID] Interval       Transfer     Bandwidth
[228]  0.0- 1.0 sec  1784 KBytes  14615 Kbits/sec
[228]  1.0- 2.0 sec  1913 KBytes  15671 Kbits/sec
[228]  2.0- 3.0 sec  1903 KBytes  15591 Kbits/sec
[228]  3.0- 4.0 sec  1920 KBytes  15731 Kbits/sec
[228]  4.0- 5.0 sec  1888 KBytes  15470 Kbits/sec
[228]  5.0- 6.0 sec  1920 KBytes  15729 Kbits/sec
[228]  6.0- 7.0 sec  1887 KBytes  15460 Kbits/sec
[228]  7.0- 8.0 sec  1897 KBytes  15541 Kbits/sec
[228]  8.0- 9.0 sec  1935 KBytes  15854 Kbits/sec
[228]  9.0-10.0 sec  1887 KBytes  15462 Kbits/sec
[228]  0.0-10.2 sec  19424 KBytes  15529 Kbits/sec




40MHz test 1 -
[252] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49399
[ ID] Interval       Transfer     Bandwidth
[252]  0.0- 1.0 sec  3041 KBytes  24911 Kbits/sec
[252]  1.0- 2.0 sec  3495 KBytes  28632 Kbits/sec
[252]  2.0- 3.0 sec  3385 KBytes  27728 Kbits/sec
[252]  3.0- 4.0 sec  3431 KBytes  28110 Kbits/sec
[252]  4.0- 5.0 sec  3305 KBytes  27071 Kbits/sec
[252]  5.0- 6.0 sec  3528 KBytes  28901 Kbits/sec
[252]  6.0- 7.0 sec  3544 KBytes  29036 Kbits/sec
[252]  7.0- 8.0 sec  3488 KBytes  28572 Kbits/sec
[252]  8.0- 9.0 sec  3407 KBytes  27914 Kbits/sec
[252]  9.0-10.0 sec  3497 KBytes  28646 Kbits/sec
[252]  0.0-10.1 sec  34352 KBytes  27963 Kbits/sec


40MHz test 2 -
[240] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49400
[ ID] Interval       Transfer     Bandwidth
[240]  0.0- 1.0 sec  2792 KBytes  22873 Kbits/sec
[240]  1.0- 2.0 sec  3232 KBytes  26480 Kbits/sec
[240]  2.0- 3.0 sec  3360 KBytes  27528 Kbits/sec
[240]  3.0- 4.0 sec  3183 KBytes  26077 Kbits/sec
[240]  4.0- 5.0 sec  3169 KBytes  25957 Kbits/sec
[240]  5.0- 6.0 sec  3272 KBytes  26801 Kbits/sec
[240]  6.0- 7.0 sec  3273 KBytes  26811 Kbits/sec
[240]  7.0- 8.0 sec  3487 KBytes  28567 Kbits/sec
[240]  8.0- 9.0 sec  3400 KBytes  27851 Kbits/sec
[240]  9.0-10.0 sec  3497 KBytes  28644 Kbits/sec
[240]  0.0-10.1 sec  33176 KBytes  26793 Kbits/sec



40MHz test 3 -
[148] local 192.168.11.3 port 5001 connected with 192.168.11.4 port 49401
[ ID] Interval       Transfer     Bandwidth
[148]  0.0- 1.0 sec  3281 KBytes  26878 Kbits/sec
[148]  1.0- 2.0 sec  3656 KBytes  29947 Kbits/sec
[148]  2.0- 3.0 sec  3585 KBytes  29368 Kbits/sec
[148]  3.0- 4.0 sec  3534 KBytes  28955 Kbits/sec
[148]  4.0- 5.0 sec  3672 KBytes  30082 Kbits/sec
[148]  5.0- 6.0 sec  3704 KBytes  30346 Kbits/sec
[148]  6.0- 7.0 sec  3664 KBytes  30012 Kbits/sec
[148]  7.0- 8.0 sec  3675 KBytes  30102 Kbits/sec
[148]  8.0- 9.0 sec  3646 KBytes  29865 Kbits/sec
[148]  9.0-10.0 sec  3624 KBytes  29690 Kbits/sec
[148]  0.0-10.1 sec  36424 KBytes  29553 Kbits/sec
Done.

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