Re: MIMO needs that router & card have it to work?.
- From: Jeff Liebermann <jeffl@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 17 May 2006 09:05:57 -0700
"xavi" <xavi11esNOSPAM@xxxxxxxx> hath wroth:
Two wireless card will NOT go
anywhere near the 108Mbits/sec claimed on the data sheet.
This is what I want to know.
I think this will help:
http://www.tomsnetworking.com/2006/02/27/wireless_networking_ntk_2006/
It's 14 pages long but worth reading.
The three rules of Wireless Networking
1) It never goes as fast as they say it does
2) It never goes as far as they say it does
3) It never sets up as easily as they say it does
OK. I use the laptop on the second and third floor and the desktop on the
first where is the router. Wide walls and wireless phone close. But I'm
thinking that the pc is to close to the router and create inteferencies.
The PC *MIGHT* create interference but I've never seen any PC or
laptop do that. Spread spectrum is very resistant to interference
from such signals as a PC might generate. Proximity to a monitor
causes problems due to radiation from the flyback transformer. In
general, interference sources must be either spread spectrum (2.4GHz
cordless phones) or high power (microwave oven). I consider it very
fortunate that you have any form of connection through 3 floors and 2
floors. One access point per floor will help considerably as 2.4GHz
does not like going through walls and floors.
Checklist of possible interference sources:
Microwave oven
2.4Ghz video or security camera link (X10).
Municipal wireless networks.
Bluetooth devices (mouse, phone, PDA, headset, cell phone, etc)
Portable wireless TV camera used at sports events.
Frequency hopping cordless phones (Panasonic Gigarange)
802.11b/g wireless keyboards, PDA's, and cell phones.
2.4GHz game pads and controllers.
RF Excited Lighting (Fusion Lighting).
2.4GHz baby monitors.
2.4GHz ham radio operation.
WISP (wireless internet service providers) which may be using
non-802.11 type of modulation (i.e. WiMax).
Breezecom/Alvarion/Symbol/Raylink frequency hopping networks.
Western Multiplex or Proxim non-802.11 wireless links. (e.g Lynx).
HomeRF frequency hopping network.
Zigbee 802.15.4 sensor wireless network.
Microwave fruit drying oven, plastic mold preheater.
Unstable high power wi-fi power amplifier spraying garbage.
And the 108 MBps will be if someday I need to copy a lot of bytes, I suposse
that I'll have to put two pcs very close, but It would save me to write a
dvd or to conect wired.
If you need to place the PC's close to obtain adequate speed for
copying large amounts of data, you can do better by connecting a
crossover ethernet cable between the PC's. Todays laptops are coming
with gigabit ethernet cards, which I've measured at about 300Mbits/sec
thruput without any tweaking or optimizing. I should go much faster
but was limited by the performance of the hard disks.
Thank for your answers I'm new on this and you show me a lot.
Good luck.
--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.
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