Dual polarity antenna with Nstream2?

RouterOS Wireless Networking
1

We’re considering using nstream2 for a PTP backhaul. Current requirement is that it be able to do 10 M bps full duplex, but it is likely going to have to go a bit higher than that (possible up to 25 M bps or so).

Currently the link is on a Trango T-link-10, which has been working flawlessly for over 3 years. Unfortunately, the T-link is half-dux, and we are getting close to the maximum throughput on the beast.

The good news is that we put up the T-link with a pair of 3 foot, dual-polarity dishes from Radio Waves. I’m thinking that it might just be possible to slip in a pair of MT boxes with nstream2, run horizontal at 5.8 GHz, and vertical at 5.2 GHz.

Has anybody tried this? Or do we need more separation than the V-pol/H-pol and band separation will provide?

2

I have seen Grid’s with both horizontal and vertical feeds built into the same antenna.

Apparently they work really well. As 5.8GHz channels doesn’t overlap as badly as 2.4GHz, I don’t see why it would not work.

I would say one of the more important aspects to consider, is your router’s CPU.

3

We ended up putting in a 2’ (60 cm) dish with a dual polarity feed (from mWave). Operating on 5.7 H-pol, and 5.2 V-pol.

Seems to be working fine. We get about -65 db both ways, and generally run at 54 Mbps radio speed both ways. Our speed tests show fairly consistent 20+ Mbps both ways, full dux. This is on a pair of RB133’s.

We did turn off connection tracking and filtering. This helped a bunch in the throughput department, and the CPUs are running 3-5 percent busy now with a half-dozen subscribers. We’re pushing less than 3 GB of data per day.

4

Are you using 1 RB133 on each side? When doing ±20Mbps, what are your CPU’s doing?

What do you mean with you disabled filtering? Are you referring to Wireless security such as MAC Filtering or WEP?

5

you are not doing full duplex 20mbit on a 133, with nstreme…

way too much CPU for a 133.

please clarify.

thanks

6

K’mon 20+ Mbps full duplex !!! on RB133’s !!! You got to be kidding us.

That is impossible as far as I know, read and according to the test I have already made… even RB532A w/400Mhz will be on its knees with that amount of data passing through it.

Please explain… How are your CPU’s at that speed? … 3-5 percent busy know whit what? 100kbps?

Please explain, thks.

Jorge Boardman