Community discussions

MUM Europe 2020
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Sat Sep 13, 2008 3:49 pm

Hi!

I currently have a 1.5km 5GHz point-to-point link with 2 pcs of RB133C and biquad antennas. Now the bandwidth is limited at one end of the link to 10Mbps (limiting bw on the switch port where the RB133C is connected). This way, my connection is stable, the CPU usage on the RBs is 70-80%. If I turn off the BW limit, the CPU usage goes 100%, and packet losses occur.

There's heavy P2P traffic on the link (most of it is Bittorrent), and the incoming BW is 100Mbps at one end of the link.

I'd like to upgrade this current connection, to be able to turn off BW limiting, and allow the highest possible BW to pass through, while maintaining adequate QoS (no packet loss, no insane PING times, etc.)

I'm planning to install parabolic antennas with dual heads for nstreme, and powerful devices at the ends.

I'd like to use mikrotik routeros, therefore I'm considering RB433AH with 2 pcs of R52H radios, or some kind of PC-based solution (Mini-ITX, with CF card, or SSD, and preferably passive cooling, and fully supported by Mikrotik RouterOS)

My question is: what endpoint devices do you recomment for this project?

Thanks for your help!

Petya
 
galaxynet
Long time Member
Long time Member
Posts: 648
Joined: Fri Dec 17, 2004 2:52 pm
Contact:

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Sun Sep 14, 2008 4:00 pm

_Petya_

Well it really depends on how much you want to do with the units on each end....

RB433ah or RB600 will certainly do a good job. With the proper setup they should be able to pass 50mbps+ with dual wlan cards...and still have the cpu processing power to do a good amount of QoS servicing....

Parabolic antennas and R52Hs should be more than adaquate to get the job done.

R/
Thom Lawless
General Manager
RapidWiFi, LLC
thom.lawless [at] rapidwifi.com
 
User avatar
Equis
Forum Veteran
Forum Veteran
Posts: 888
Joined: Mon Jun 06, 2005 6:48 am

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Mon Sep 15, 2008 1:47 am

Hello

The 433ah will do all you need.

Until you upgrade can you turn of connection tracking, disable all packages you don't need, and turn off ANA, also upgrade bios
This may help your cpu problem till you can replace boards.
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Mon Sep 15, 2008 2:24 pm

Hello

The 433ah will do all you need.

Until you upgrade can you turn of connection tracking, disable all packages you don't need, and turn off ANA, also upgrade bios
This may help your cpu problem till you can replace boards.
Hi!

Since I have a public subnet, and all my devices have public IPs, I don't need connection tracking, I think. How can I turn it off? And what is ANA? I've googled it, and the first hit is this thread :D

regards,
Peter
 
kevin@safelink.net
just joined
Posts: 12
Joined: Tue May 22, 2007 8:25 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Thu Sep 18, 2008 9:49 pm

I'm sure Equis meant ANI, Adaptive Noise Immunity.
 
User avatar
jp
Long time Member
Long time Member
Posts: 599
Joined: Wed Mar 02, 2005 5:06 am
Location: Maine
Contact:

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Fri Sep 19, 2008 5:11 am

You need connection tracking if you have any customers using VPNs.
 
User avatar
jorj
Member
Member
Posts: 398
Joined: Mon Mar 12, 2007 4:34 pm
Location: /dev/null

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Sun Sep 21, 2008 11:41 am

For 1.5 km you don't need any r52h cards. You will have to lower the power in connection with parabolic dishes. But do use parabolic antennas, as they will get you the maximum isolation from the "rest of the world" active in wifi in your area.
You can always go for a pc version, might get you only a little cheaper at first, but with lots of resources for possible later scenarios.
In my experience, if you have lots of noise in the area, you might get better results with bonding several simple nstreme links than with nstreme dual. This, again is from what I tried.
Also, if the only scope of the link if passing traffic, with no control over it, disable all firewall rules, and all unneeded packages if using rb. You get more free resources this way.
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Thu Sep 25, 2008 8:47 pm

For 1.5 km you don't need any r52h cards. You will have to lower the power in connection with parabolic dishes.
Are they _too_ powerful for the parabolic dishes? Why?
But do use parabolic antennas, as they will get you the maximum isolation from the "rest of the world" active in wifi in your area.
That's what I want :)

regards,
Petya
 
User avatar
jorj
Member
Member
Posts: 398
Joined: Mon Mar 12, 2007 4:34 pm
Location: /dev/null

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Thu Sep 25, 2008 9:03 pm

For 1.5 km you don't need any r52h cards. You will have to lower the power in connection with parabolic dishes.
Are they _too_ powerful for the parabolic dishes? Why?
But do use parabolic antennas, as they will get you the maximum isolation from the "rest of the world" active in wifi in your area.
That's what I want :)

regards,
Petya
:)
R52 are not _too_ powerfull for the dishes, but for the distance, connected with the dishes. So, if you lower your power on the card, what's the point in spending the extra money ?!?

Use this: http://www.zytrax.com/tech/wireless/calc.htm or some other calculator to see your power budget in connection with the gain of the dishes.
A too powerful signal might eventually burn your cards, ( if it's waaaaaaay too powerful), or it might just "blind" the other radio. It would be just how you'd expect to talk to a person half a meter away, by shouting out loud, as hard as you can. He will sure hear you, but won't understand a thing.
A -40 to -60 should be enough for 54/104 mbit link, provided there is enough clear spectrum for you in the area.
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Mon Dec 29, 2008 7:52 am

Hi!

Just another aspect I haven't thought about yet: security. How can I protect my link from sniffing/eavesdropping? Can I use WPA with nstreme dual?

regards,
Petya
 
dot-bot
Member Candidate
Member Candidate
Posts: 164
Joined: Tue Oct 11, 2005 7:05 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Sat Jan 03, 2009 12:26 am

If you run encrypted tunnels over the WiFi link you will lose tiny percentage of bandwidth and CPU because of overhead.
 
shielder
Member Candidate
Member Candidate
Posts: 221
Joined: Wed Feb 09, 2005 7:09 pm
Location: Indonesia

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Sun Jan 04, 2009 12:58 pm

this is how to disable con. tracking

/ip firewall connection tracking set enabled=no



it would help you better.

If you turn off conn.trac everything that is included in /ip/firewall will be disable. you can't do nat, filter, mangle

for board. i would suggest rb433ah, best price with the best performance
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Tue Jan 06, 2009 9:11 am

Hi!

Thanks for the answers. Now I have measured the exact distance, and it turned out to be 1 km. I've tried the calculator linked above, but it"s quite difficult for me, and maybe I entered something wrong..

Could someone please do the calculations for me?

Antennas: prime focus parabolic, 44cm, 24 dBi gain
Cables: U.FL connector on R52 card -> U.FL-N pigtail 15 cm -> N connector -> 5 meters of H-155 cable (attenuation: 0,6dBi/m ) -> N connector on the antenna
Distance: 1 km, clear line of sight, one antenna is on the top of a 10-floor building, other is on the roof of a 2 floor buildng.

The question is: what TX power should I set on the TX radios?

I'd like to set up everything before installation, I hired the local satellite guys to install the antenna mast, and the dish on the 2-floor building, because I don't have the tools and experience to do it alone, and also afraid of falling down... However, they're TV guys, don't know anything about WiFi. I thought I set both ends to alignment-only mode, so they only have to listen to the beeps to align the antenna on the roof :)

Petya
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Wed Jan 14, 2009 3:19 pm

Could anyone please help me?
 
_Petya_
just joined
Topic Author
Posts: 14
Joined: Sun Oct 07, 2007 11:35 pm

Re: Hardware for high bandwidth 1.5km 5Ghz Nstreme link?

Wed Feb 18, 2009 1:09 am

Hi!

I have completed setting up the antennas.

With TX power set to +17 on both sides, I can only get -70 on the RX radios. Why are these values so low? Someone previously wrote me that I should expect a -40 to -60 RX power, with lowered TX powers.

The other strange thing is, that at one side, the TX radio sees the RX radio, and vica versa, with -20 RX power. Is this acceptable?

regards,
Petya

Who is online

Users browsing this forum: No registered users and 77 guests