I’m wondering how are they calculate ? I’ve got link 9 km and I’m getting very strong signal -49 to -50 dB. But those variables are standing low and unpredictable about 20 to 30 percents. The links are connecting with 36 Mbps, and 20 % are about 8-9 Mbps, which is the real amont of data transfered throw the link (watched by torch).
Where could be the problem?
Ok still far from what I need (I’m targeting at 36 Mbps with ~ 70 ccq), but it is getting better.
Does nstream always improve soo much wireless bandwidth or it is only with my link ?
There is enought Horse Power in those machines (2 GHz 512 of ram). I’ve lock down the radio rate one step below, on default rates it connects at 36 Mbps rate. But still the problem with the low bandwidth exists. I expect from those radios real 24 Mbps (36 Mbps with tx-ccq~rx-ccq~70), now i get about 12-14 Mbps.
I don’t know the reason and I’m still looking for it. I’ll try 2.9.x in Monday 'cause in weekend I don’t have access all the time to the room where is the bridge and I don’t what to make any mistakes and lock the internet for 2 days .
Is there anywhere description of the formula or the way of computation of tx-ccq and rx-ccq?
Well your CPUs look fast enough -
Interference is possible?
Try locking the radios one step lower and using Turbo mode if not already. Bizarrely, we found 2x24Mbps works better than 54Mbps (non-turbo) on a given link conditions.
During a one-way bandwidth test, on a “good” link ccq can read around 95-105 range in the test direction, and about 6 in the return direction.
John Tully (I think) gave an explanation before on the forum.
Could you sharing some trick perhaps,
how to improve troughput ?? In MT 2.8 ???
Beside :
Lock radio rate to one lower than the max
Disable connection tracking
Enable fast frames
I’m couldn’t get the rate that i’m hoping to get..
What version of MT (2.8.x) that have the best
Atheros (AR5213) driver performance ???
In lab test, the max i could get from :
Data Rate 48 Mbps (band = 5 GHZ)
CPU Pentium 3 866 Mhz (Bus 133)
Troughput :
Bandwidth test : (UDP)
25 s/d 35 Mbps
Bandwidth test : (TCP)
20 s/d 22 Mbps
Data Rate 48 Mbps (band = 5 GHZ-turbo)
CPU Pentium 3 866 Mhz (Bus 133)
Troughput :
Bandwidth test : (UDP)
35 s/d 40 Mbps
Bandwidth test : (TCP)
25 s/d 33 Mbps
Stephen could you sharing some trick / configuration,
what’s we must set in MT in order to get more
bandwidth / troughput ?
We confused, because no matter what we do,
we couldn’t get even nearing troughput that you
or other forum member say they could get.
Eg : UDP (60-65 Mbps)
TCP (45-55 Mbps)
We’re going to put together a document for our customers explaining step-by-step how to set up the routers for bridged mode with WDS, with some screenshots. It’ll be posted on our site, and I’ll put a link here.
Sorry this is taking a while, we are really busy on some major projects.
Okey, I’ve recieved a pair of 400mW beasts, and one pair of CM-9 “kitties”. This weekend I’ll try to get some more from this link with those 2 cards. A friend of mine told me that Senao’s I’ve bought are very good for long distance.
That’s because with Turbo on lower speed you’re using a more robust modulation (16QAM instead of 64QAM) and spreading out your data over 40MHz instead of 20MHz. You have twice the subcarriers and less complex data to get over the air.
Turbo mode does use more CPU power than non-turbo for a given throughput, but not as much as you would think.
A converse argument to the above, if you have a CPU-limited system, you may get better throughput at good signal levels by using non-turbo and higher order modulation.
With SR5 I get 75 % of 48 mbit turbo mode.
But when I try to put CM9 and Senaos on a 3 km link I got -50dBm signal and 2% of 9 mbit tx-/rx-CCQ …
I’ve switch to 2.9.7. After I saw such a little ccq, i made another couple of PCs and switched back to 2.8.x, but the ccq still stays low. I’ve change the cables with new one. Feedhorns with improved one. But the problems still stays on … Where should I look for the answer, have you ever saw such a good signal and such a low ccqS?
I have the same problem, with 6 towers… All 6 towers worked just fine in the past, with clients showing 15-20 CCQ before, but now, some clients on all six towers show CCQ in the 0-1 range, which doesn’t work at all. I don’t know if it’s because I upgraded to newer 2.9.x versions of RouterOS or if there is just a whole lot more noise now, but these links were working fine before on multiple towers, and now I have nothing, no matter which frequency I choose. Now, I have some clients that still have -59 signal level in both directions, but CCQ in the zeros… I also find it odd that there have been multiple questions here on the forum(found by searching) asking for more specifics about what the CCQ means and how it is calculated, but none of them were ever answered by MT…
Can you MT guys please fill us in on this info???
Hitek
Edit: Intel P4 Towers running MT with RB500 clients…
the CCQ will be low if there is no data going through.
From the manual:
rx-ccq (read-only: integer: 0..100) - Client Connection Quality - a value in percent that shows how effective the receive bandwidth is used regarding the theoretically maximum available bandwidth
Try to transmit and receive the data and the monitor these values.
When you upgraded to the v2.9.x was it working good (with good ccq)?
Please send the support output files to support@mikrotik.com so we could check what could be the problem.
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