you’re going to have harsh times, dude. You may see some people post 50+ Mbps transfer rates, but those are bases on internal test-bandwidth test and probably not REAL tcp/ip transfer rates. My experience tells me that link which is able to show off 25Mbps in bandwidth test, has problems transferring real 7Mbit/s uncompressable data.
We lose a bit less than 50% on each hop. We get almost 30Mbs/30 miles with Nstreme Turbo on the first hop, no more than 19Mbs over 2 hops/60 miles etc etc.
This problem doesn’t happen with Redlines, no one has been able to explain the per hop drop in bandwidth so far.
Yup I remember clearly.
Yes we have tested “real world” and done some extensive soak tests, but not at those sorts of distances.
We’re scheduled to do some range-bandwidth tests soon, but believe it or not, for a wireless vendor, we’ve a lack of good sites (we’re based in surburban south west London - doh!), and time on other big customer projects (laser) has delayed our radio range testing.
If you have a couple of towers/sites handy, and some big antennas for the long hop, we’ll gladly loan you some equipment to test, including back-to-back as well as single link throughput.
That’ll get things done super-quick, and tell you if this is going to be a winner or not …
you know, this should not be about luck. What are you going to do if this solution works right now and it will not be capable of delivering those 20Mbps in two months because of interference in the air?
Well we are talking about unlicensed radio bands, so there’s no guarantee of no interference …
… but some of the problems people describe seem to be “system problems” certainly on back-to-back repeated links.
Those need to be tested live, and the known-good configurations posted so everyone can see it works
[quote=“mp3turbo2”]ghmorris, are your numbers real tcp/ip transfers or just bandwidth-test numbers?
thnx![/quote]
Real numbers.
There are caveats of course. MT does not like interference when delivering high speeds and there is no spectrum analyzer feature yet to track down problems.
The multi-hop speed degredation is a real problem.
We have also had some lockups running Nstreme on routerboards. We even had a lockup today on a P4 which surprised us.
MT really needs ATPC on a per-burst level for very long shots where both fast and slow fades are an issue. We’re just getting into fade season here and will be shortly be replacing the MTs on our longest shots. They simply can’t adapt to the changing RF conditions. Our experience is the Atheros cards don’t like being shouted at or whispered to. They like a -55 to -65 signal for peak performance.
Saying all that, there is nothing else on the market we’ve found yet that packages this much throughput with this much control in an inexpensive package and we intend to continue with MT on short to mid-range high-speed links.
