Maximum bandwidth

RouterOS Wireless Networking
1

Hello people,


Equipment:
2 x 23dbi panel antenas
1 x rb111 and r52 ROS3.1
1 x rb133 and r52 ROS3.7
5.8ghz
5km Point to Point Link


I made a wds link between the equipment there is no routing going on only bridge mode, I also followed this howto http://wiki.mikrotik.com/wiki/Bridge_Transparente_usando_WDS , giving that the configuration is the same as in the howto, the noise is almost none and there is perfect LOS. What is the maximum bandwidth you guys achieve in a similiar environment ?

I am achieving 15mb, that means about 10mb download about 5mb upload.


Is it possible to achieve more than the bandwidth Im doing ( I really need more.), is there a better configuration??

Many thanks in advance.

2

I can’t say for the rb111, but the 133 has always been slow for me.

I’d swap both of those for a 411. I’ve gotten over 50Mb throughput in turbo with two 411’s and r52’s.

3

Thanks for the reply, but are you getting 50mb using the configuration I’m using (wds) ?? or a different configuration ??


Thanks.

4

nstreme, disable csma, turbo.

5

I used WDS bridge, no Nstreme, straight 802.11a turbo.

6

ok guys thanks for the info, I’ll be testing it out tomorow but I have a question, should I disable csma in both of them and enable nstreme and polling on both or just the AP-bridge ??

7

I’ve found that Nstreme and disabled CSMA helps on some links, not on others.

You set Nstreme on both sides. The AP controls the polling and disable CSMA options.

8

I’ve verified that if I enable Polling and CSMA on the wireless interface and the TX Power parameter set to default values, in the Registration Table the Signal Strength increases while the Tx / Rx Rate is worse, however if I set the parameter TX Power such as All Fixed Rate on 30 and disabling CSAM, it changes the value Signal Strength that it’s worse but increases the Tx / Rx Rate.

Is it better to have a better value of the Signal Strength value or a better Tx / Rx Rate?

Cetalfio

9

First, what card are you using that is taking 30dBm tx power?

Second, what are the actual signal levels/connection speeds we’re talking?

Generally, 5GHz links, you want to get the CCQ up as close to 100% as possible. CCQ (don’t remember what it stands for) is essentially telling you how often the radios are getting the right info on the first try. 80% CCQ means you’re having to resend about 20% of the data again. CCQ is showing the connection quality, however, just for reference, it is not as big of an issue on B mode, just works differently than G or A.

Just an example, if you get a 54mb link at -74 with 90% or better CCQ, getting the signal to the -60s won’t make a noticeable improvement. If CCQ is around 50%, you can set the data rates to only connect at 36 or 48, often boosts CCQ up to 100%, bandwidth and ping would be much more stable, generally faster, than at 54mb with lower CCQ.

10

I believe ccq stands for client connection quality.

11

nstreme and disable csma
2009-05-27_114832.jpg