Hi, I have link on 0,5 km on sxt and another one ond 411ah + 433ah with R52HnM just one by another, and next link 1,5 km long with 433ah -R 52Hn tetra 23+13 antenas. But problem is with every couple of minutes the ping jitter is very high for about 20 seconds. Normally link connect with 243/270 Mbit and sometimes the speed goes down. Now tried to set-up lower speed 162 Mbit and normally quality is OK then suddenly drops down and TDMA TX and RX sizes are changing wit big jitter. The same on other links other equipment. No matter what speed usesd for a stable tried 108 Mbit even and 243 Mbit - the same result. But speed of link is good but every couple of minuts the link is something like calculating and there is a problem. Mayby somehow set the TDMA TX/RX size for a static one would prevent this problem but don’t know how. Problem is to get most stable ping - gamers are very unhappy. The less link is used the more jitter.
LInks are with N - antenas v+h TetraAnt, 5.1 OS, nv2 - TDMA period size=1 Normally as you see ond ping2 - 50 mbit FDX doesn’t make the link hig load, ping is OK. More interesting is that when in the night the jitter is higher whent the traffic is low- in a day whet traffic is higher jitter is also but usually not higher then 100 ms
Any sugesstions will be welcome .
links looks like this SXT – 0,5 KM - Sxt - ROUTERR433AH -433ah—1,5 km - 433AH
411AH --0,5km --433ah — |
there are thow links 411ah + sxt is backup . All links have the same problem channels are from 5200 to 5800 as far as possible doesn’t solve a problem
ok found some solutions - it happens when used extension channel - on normal operations 20Mhz it works much better jitter is no more than 20 ms that’s acceptable but why ?
why tdma tx / rx size is flowing from 475 to 4000 ? it is possible to set this static ?
doesn’t matter . every couple of minutes quality goes down on one side and TDMA sizes are changing - and after 30 seconds full link speed - and speed is again good.
I found that on sxt link link is now stable ping is no more than 15 ms but only when works with maximum 130Mbps when enabled extension channel the fun begins again.
On R52Hn with 411AH and 433AH, both with seperate antennas for tx/rx. it’s much worse.
Okay. I would recommend a little higher TDMA period size. i’ve had problems with it set to 1ms try 2ms.
also, what do you have the HW. Retries set to? Also you can try setting a Frame Lifetime to prevent network latency in case of spurious interference. Could you be interfering with yourself?
In some of your images, your CCQ’s are dropping BAD.
Low CCQ = High latency. Especially if you are ensuring delivery of every packet. Basically what happens is
Ap is trying to guarantee packet delivery. Fails. keeps trying until it succeeds, or the Hw. Retries maxes out. While this happens, no other traffic goes in or out unless you are doing Dual Nstreme or 2 X links + OSPF.
I think the Nv2 TX/RX Size is calculated based on Modulation rate + TDMA Period size, so it would be adaptive. --Anyone know about this for sure?
Anyone else have some input?
Post your config as well. open up terminal and type
