Community discussions

 
rodolfo
Long time Member
Long time Member
Topic Author
Posts: 543
Joined: Sat Jul 05, 2008 11:50 am

Tuning point2point 802.11N, nv2

Wed Nov 02, 2011 9:21 am

Hi all.
In a 5GHz point-to-point, using good parabolic antennas, good cables, well builded radios (411AH+R52Hn) and placing correctly antennas, what are the parameters to try to tune?
I use this:
1. find a free frequency
2. set regulatory domain
3. play with antenna gain to calibrate output power
4. set data rate default with advanced rate selection
5. set hw retries = 7
6. set preamble mde = short

Leave the rest as default.

Are there other parameters (also not visibile from winbox) to try to tune to obtain a good link ?

Thanks
rodolfo
IZ0UQV
 
n21roadie
Forum Guru
Forum Guru
Posts: 1889
Joined: Fri Aug 07, 2009 10:36 pm
Location: Limerick,Ireland

Re: Tuning point2point 802.11N, nv2

Wed Nov 02, 2011 11:45 am

Site location is very important and proximity to other Wireless antenna's + what distance is the link is Freznel zone clearance between point A to point B OK,which polarity are you using H or V, use very short cables to the Antenna's, and is the antenna's dish or mesh grid, set the antenna gain in winbox to 0db
N21roadie,
Network 100% MT for Now?
 
rodolfo
Long time Member
Long time Member
Topic Author
Posts: 543
Joined: Sat Jul 05, 2008 11:50 am

Re: Tuning point2point 802.11N, nv2

Thu Nov 03, 2011 9:12 pm

thanks.
there are other parameters to tune in wireless interface to optimize a link (other than those listed)?
rodolfo
IZ0UQV
 
sup5
Member
Member
Posts: 322
Joined: Sat Jul 10, 2010 12:37 am

Re: Tuning point2point 802.11N, nv2

Thu Nov 03, 2011 9:40 pm

I usually use bridge <-> station-bridge and don't allow for data rates that require QAM64. Also I only use long guard interval.
I noticed QAM64 and the short Guard-Interval to be too risky to use (packet drops might occur, latency isn't stable!)

This means only the following data-rates should be enabled in custom-mode:

5Ghz-A:
6, 9 ,12, 18, 24, 36 Mbps

MCS 5-GHz-N:
0, 1, 2, 3, 4
8, 9, 10, 11, 12

I don't need the full sync of 270/300 Mbps.
IMO 162 Mbps on 802.11n with 2x2 Mimo is enough. This allows for 100Mbps half-duplex!
Everything that needs more throughput should be realised with licensed PtP-Links, or optical fibers.
 
rodolfo
Long time Member
Long time Member
Topic Author
Posts: 543
Joined: Sat Jul 05, 2008 11:50 am

Re: Tuning point2point 802.11N, nv2

Sat Nov 05, 2011 7:29 pm

thanks.
but guard interval is only for 802.11bmode or it works also for N?
rodolfo
IZ0UQV

Who is online

Users browsing this forum: No registered users and 20 guests