On 22 Jul 2005 12:33:04 -0700,
atebark@gmail.com wrote:
>I have done the tests: When i am connected via my belkin 2.4ghz
>wireless 802.11b router, my download speed is about 5mbps and when i
>connect direct to my PC, the speed is about 10mbps. Anyone know why
>this is happening?
Yep. The maximum speeds for the various wireless modes are:
This is stolen from an Atheros PDF at:
http://www.atheros.com/pt/athe ros_range_whitepaper.pdf
with some additions and corrections by me.
Non-overlapping Modulation Max Max Max
Channels ------- | Link TCP UDP
| | | | |
802.11b 3 CCK 11 5.9 7.1
802.11g (with
802.11b) 3 OFDM/CCK 54 14.4 19.5
802.11g only 3 OFDM 54 24.4 30.5
802.11g turbo 1 OFDM 108 42.9 54.8
802.11a 13 OFDM 54 24.4 30.5
802.11a turbo 6 OFDM 108 42.9 54.8
Note that 802.11b has a maximum TCP thruput of about 5.9Mbits/sec with
an 11Mbit/sec association. More commonly, the speed is about
4-5Mbits/sec.
When you connect directly to an ethernet LAN port, you're either going
at 10Mbits/sec or 100Mbits/sec, half or full duplex. No way I can
tell from here with the minimal information you supplied. My guess is
you're connected at 100baseT-FDX, but are limited to 10Mbits/sec
thruput but whatever you're using for benchmarking.
If you want to persue such benchmarks, use a local machine, not over a
cable modem or DSL modem. Make sure the machines inolved have
sufficient horsepower to sustain a high traffic rate. Use IPerf for
benchmarks:
http://dast.nlanr.net/Projects/Iperf/
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831.336.2558 voice
http://www.LearnByDestroying.com
#
jeffl@comix.santa-cruz.ca.us
#
jeffl@cruzio.com AE6KS
download speed slower via belkin 802.11b router 
Linear Mode
