Greetings,
I need a very low latency solution for a fast point-to-point link, and I want to research an Nstreme-Dual Mimo hardware-full-duplex 80/160MHz links, to avoid bandwidth-delay problems.
Was such a config feasible? Was the latency an order of magnitude better?
No off-topic, please.
Thanks so much,
Steve
Bandwith you need?
Distance?
Clear LOS?
Needed Latency?
Clear spectrum?
Bandwidth - I will just use it as fast as it will go. 150mbit actual TCP would be nice - probably it will go faster than 150.
I have clear LOS and clear fresnel. Distance ~8km. Spectrum is clear. Signals are excellent. Antennas are large and narrow.
Mostly I need latency as low as possible - currently I have 1.5 - 2.5msec, and want to know if a fulldup mimo link will improve that ping, and by how much.
It will not.
Thank you. I suppose there must still be a return path for that echo request.
But the Bandwidth-Delay Product should be reduced over that full-duplex link?
This is mainly my problem - reducing end-to-end latency - FDM links are supposed to fix that. TDM links make it worse.
Any further ideas on lowering the latency over a collection of links?
AirFiber 5X
@SteveWrightNZ
Mikrotik unfortunately just don’t have product you described at this moment.
The only Mikrotik’s FD radio has been announced at MUM Milano 2017 in 60GHz band so it is for much shorter distances.
For this case and distance I would also recommend a product from “that other company” but that wouldn’t be AF5X because it is also a half duplex radio.
I suggest you to get more information on their forum.
Regards,
M.
All WiFi Hardware is only Half Duplex, Mikrotik included
The UBNT 5x Controlls up and downstream capicity exactly and is near by a Full Duplex System, the ping stays between 1-2ms
The UBNT AF5 is Dull Duplex Radio for 5Ghz, with 2x50 MHz Channels and 8km at 36dBm EIRP you would possibly see 350 MBit Full Duplex, but you need 100Mhz Clean Spektrum!
Ping is about 1ms
If you need to get a smaller latency take a look to licensed links, here the latency is about 0,2ms
Mistry7
All understood. But obviously Nstreme dual does actually function hardware full-duplex at all, or was that just a lie?
On the face of it, it seems a perfectly good idea. So what was is it’s limitation? What happened? Is RF isolation not good enough for true FDM? Was it no faster than the emerging TDM products so they put it on the back burner? Was there no spectrum to put two 40-80MHz links far enough apart without FDM+duplexing?
Seriously, we really could make good use of a sub 1msec hardware full duplex unlicensed system in the 8-17GHz range. The alternate is a lot of money.
Maybe one day.
He asked for low latency not necessary for full duplex. Full duplex was a questionable solution.
Wireless ISP’s are not affected by extra 1-3ms> we are dealing with much worse latency. So gaining 1ms for at least 4x the price is not important for 99% of us.
Dual nstreme works but I remember that my dual link was nv2.
Since you must install 4 radios it’s pretty much a hardware function. Software does the rest, like any other radio.
Do you think so? I’d like to hear any suggestion of getting .2mSec latency from a half-duplex TDM link. I don’t think that exists.
All my PtP and PtMP links are 1.3-2.5msec latency. I’d not be so brave to try making money out of worse latency links than this. There is already enough work to do chasing this network problems on these links, rather than them being much worse!
Getting better latency is always going to be a hardware problem. Less time with an envelope-stuffer standing there with its’ hands in its’ pockets instead of filling spare timeslots.
Thanks everyone for the interesting technical exchange.
S
Maybe you should read your first post again. That’s the post I’ve replied.
Good luck.
What about a air Fiber24HD?
Only problem will be rain fade