900Mhz Nstreme PtP

RouterOS Wireless Networking
1

Hello, I had a very interesting problem, perhaps someone can give me a solution

a client has a 900mhz PtP link between his work and his house with 2 RB411A and 2 yagi 13db antennas with XR9
his link started to had low CCQ so he decided to active nstream and the link automatically improved a lot.

At 1.5km I have a 8db omni antenna with SR9 linked with 3 other links of my own with rb133c, sr9 with yagi 13db each and every single link gets down when he actives nstream protocol. I talk to him and did some testing, when the nstream is off everything works fine for me, the second he put nstream on I lost all my link.

I was thinking that nstream uses 20mhz or something like that and because 917 and 912 channels are so near its imposible to work.

Could anyone tell me exactly how nstream works to think how to solve this problem?

Thank you very much.

2

Hi!
i’m using MT and Xr9 point multipoint, but when i enable nstreme, the troughput increase, but the link was really unstable.

I must forced to 2.4 only B. and data rate 11 mbps. here are really stable, but the speed go down.

Any Idea?

Thanks!

Augusto

3

What board you use? I’m testing RB/133C + XR9 (Nstreme enable), works good.

4

Im using on AP RB433, and client is RB411.

Nstreme disabled becouse if i active the link was unstable.

but the troughtput are really low (<300k).

Thanks

5

I cannot get the Ubiquity XR9 card to work with Nstream enabled, like others have reported. :frowning:

I have Ver 4.9 of the RouterOS and the units are next to each other with attenuator pads to know the signal down.

I am running AP Bridge with WDS and Station with WDS. Works great with no Nstreme.

Turn Nstreme on and the thruput from the client to the base is good and like it was with Nstreme off. But when do thruput test from base to client, the client device drops out of the registration list on the AP for some bizarre reason. It does not do this with the 770 MHz or 2.4 GHz Ubiquity cards… only the 900 MHz cards.

(I need Nstreme because I need polling enabled.)

Anyone else see this ? Any suggestions? Thanks.

  • Mike
6

I do a lot of 900 and the only version that works 100% is v3.28 - v3.30 works good but is too sensitive in noisy environs. I use both Nstream and non-nstream. The noisier the environ the less I use nstream.
v4.x is basically usless both ways and v5.beta is not proven yet but still has some of the v4.x proclivities.
Hope this helps.
Rod
I use XR9s and RB433’s and RB411’s

7

Are you using wireless-test package? Your results would make sense if you used wireless-test since , apparently, v3.30+wireless test = v4.x

8

I never use test packages - use straight version.

9

If you have other 900MHz usage in the area (which is only detectable using a 900MHz spectrum analyser like from Ubiquiti or Metageek) nstreme on the SR9/XR9 usually causes more problems than it helps. We’ll only turn on nstreme when we are in an area with little other 900MHz usage. We also never go above a 10MHz wide channel to help keep our exposure to random interference limited.

10

You can wait for the Ubiquiti Rocket M9, which operates en 900mhz, uses dual pol antennas and operates un TDMA.

11

900Mhz would work great, out in a rural or mountainous area. If you attempt using it in a populated area, you’ll have intermittent problems, due to the high usage of 900Mhz on all kinds of stuff.