802.11n Support

RouterOS Wireless Networking
1

HI Mikrotik,
Do youi have in planning to support 802.11n standard based on atheros XSPAN chipset?

Regards
Xandor

2

hi guys, someone know if there is a mini-pci card 802.11n compatible with routerOS?

thanx

3

not now. It is possible that we will add support for that in v3.0

4

dont you need 3 antenna to use n?

5

yes you do

6

Hi normis, Hi every one:
What about if I use only one antenna?? Is it going to work?? Is the speed will drop to 54Mbps?
As far as I know, the use of three antenna will help in selecting the best signal of the three antenna.
All my points is how we can take advantage of such tech. in the outdoor systems?? Or we cannot??
Imagine 300Mbps from simple wireless outdoor unit !!!

7

we don’t have such informaton, you can look on the internet about this.
When you will use only one antenna then you will not be able to get the full speed.

8

The MIMO technology used in 802.11n uses diversity antennas/receivers to gain the RX performance by extracting information signal from multiple recieved signals (they are slighty diffrent from each other) and noise rejection. This technique is used for years in GSM/UMTS to achieve top sensitivity and interference immunity (near every sector of cellular BTS has two sector antennas.
With one antenna you loose the main n advantage.

P.S. you should to keep in mind that the n require the multiple antennas on the client side too.

9

Boro has that absolutely right -
If you want a read-up, wikipedia isn’t too bad:
http://en.wikipedia.org/wiki/Multiple-input_multiple-output_communications
http://en.wikipedia.org/wiki/802.11n#802.11n

It’s also interesting to read up on the chipsets that are already coming out -
http://www.atheros-xspan.com/modules/articles/files/AR5008E-3NXBulletin.pdf
http://www.atheros-xspan.com/modules/articles/files/AR5008-3NXBulletin.pdf
look like solid contenders. There are cards already shipping on the market, AFAIK.

and elsewhere there is generally a debate about how useful this is going to be in an outdoors environment. For P2MP there are advantages in non-LOS environments, and also, beam-forming capability means the power is directed to the user almost on a “per packet” basis. Some of the latest Netgear etc routers already do this, for indoor use. But for P2P links, I’m not convinced the 802.11n cards will make the link any faster, because the underlying modulation (64QAM, 40MHz channel) is the same as today’s non-MIMO Atheros chipsets, and I don’t think the MIMO works or gives any advantage in a P2P environment (i.e. 3 dishes pointing at each other at either end of a link).
If anyone knows more about MIMO for P2P links, please do comment/correct me -

Regards

CableFree Solutions

10

In 3.0 beta9, can we use 802.11n atheros miniPCI card?
..or it’s to early?

bye

thanks in advance

11

you have to wait for an announcement