Wireless CCQ and Data Rates

RouterOS Wireless Networking
1

Evening,

I’m new at this forum I hope this is the right area for posting. I have a confusing problem. We are testing throughput from two radios, a RB433AH with a R52h card to a RB411A with same card. The RB411A is in an AP-Bridge setup with WDS-Enabled and the 433 is in Station-WDS with WDS enabled as well. To start, my impression of CCQ (Client Connect Quality) is how much of the available throughput can actually be used, is this true?

Secondly when we have both radios linked up with default data rates and default power set we are able to get a higher throughput as their data rates are either 36 or 48mbps. However in this setup the CCQ is stuck in the mid 50’s and bounces up to 70’s at point, but in doing a bandwidth test between the two devices using the mikrotik bandwidth tester i can get about 10meg bidirectional, but why not more? I know their is some TCP overhead here but i would imagine we should be able to get closer then what we are linked to.

Lastly, when I change the data rates down to 6 tx and 6 rx manually I get a 100% ccq but my data rates get jammed down to 1.5meg- 2meg bidirectional. I would think that with 100% link i should be able to get almost 6meg bidirectional. Any ideas or help would be great, thanks much.

2

A full 54Mb connection with 100% CCQ is only capable of 28Mb theoretical, I’ve gotten about 23Mb. As these are half duplex devices, if you are moving 10Mb up, you only have about 13Mb down available.

With a 6Mb connection moving data both ways, 2Mb is about right.

3

Ok. I have a few other questions. My current config i have my point to point link running 48rx and 48tx on my data rates, a 60dBm signal strength and about %90tx and %76rx CCQ. One end of the link is in station WDS mode and the other is AP-Bridge Mode with WDS enabled. When i run a mikrotik btest from one end to the other, initally I will get 5.2mbps tx and 2.7mbps rx but as this btest runs the throughput gets smaller and smaller and I have noticed that my Data Rates actually jump down rapidly from my inital 48meg down to 36 then 12 then 6meg. Not sure why this is happening.

Any Ideas or suggestions would be very helpful. Thanks