Good afternoon,

I have to make 50Mbit FDX link.
Fresnel zone is free without interferences.
Is it possible to get ~50Mbps and low latency over 14-18km with nstreme2 or bonding + 28dBi grid antennas ?

Which card will be best for this task (Nortel ? Phillips ? or ... ?)

Best regards.

For FDX better use Nstreme2.

Do the math....
Signalstrength from point A to point B;
Pout - Ltx + Gtx - FSPL + Grx - Lrx - Lrx = Pin

And then just check Pin against what the card ais specified at each level!

If you do not want (or know how) to do to the math then google for a link budget application... there's a pretty good one here http://www.smarteq.com/industrial/se/su ... udget.html

/Jörgen

PS. With ABSOLUTELY clear fresnel zone (at that distance the 60% fresnel zone has a 9 meters radius, earth curvature is 4.762 meters so you would have to be at least 14 meters up even with a well-moved lawn inbetween!) you should be able to get 11dB link margin with standard Atheros cards @ 54Mb / 5700MHz using 28dBi antennas.

This is based on 2 meter low-loss cables to the antennas, stay away from long cables (or use EXPENSIVE 7/8 or thicker cabling)!

I have to make 50Mbit FDX link.
Fresnel zone is free without interferences.
Is it possible to get ~50Mbps and low latency over 14-18km with nstreme2 or bonding + 28dBi grid antennas ?

Which card will be best for this task (Nortel ? Phillips ? or ... ?)

Best regards.

If done right, with dual link, sure you can get 50 mbit/s full duplex.

Nortel? Phillips? Elaborate, please...

I'd use the SR5... I don't know that any nortel or phillips based cards are supported by RouterOS. Check the HCL.

Well ...
I never had SR5 :/
Phillips or nortel based cards are supported by MT.

Philips 5211 is old, but very good chipset
I have a few philips 5211 cards, but they are working over 2-5km
I think, sparklan 5313 are very good choose.

p.s.
sorry for my english, i'am little drunked now

best regards.

5211 and 5313 sound like regular atheros chipsets. doesn't matter that they have phiips brand on them