Wifi to Wifi speeds

Hi all,

Anyone know the answer ?

What is the maximum possible speed for data transfer from wifi client to
wifi client (both PC's) on the same access point with no encryption and
running at 802.11g speeds (54Mbits connection) ?
Assume the speed of the AP is not a factor.

ta,

Doz

Doz <Doz@Doz.Doz> hath wroth:

>What is the maximum possible speed for data transfer from wifi client to
>wifi client (both PC's) on the same access point with no encryption and
>running at 802.11g speeds (54Mbits connection) ?
>Assume the speed of the AP is not a factor.

I think(?) that what you're asking is how fast can you go from
wireless client to wireless client through an access point. For
54Mbits/sec that would be about 10 to 12Mbits/sec assuming 802.11b
compatibility was disabled on the access point. If left on, figure
about 5-7Mbits/sec.

See the table at:
| http://wireless.wikia.com/wiki/Wi-Fi...ance_and_Speed
Those are the max speeds from one client to the access point or to a
100baseT or Gigabit Ethernet connected computah plugged into the
access point with CAT5 cable. In other words, one wireless hop. For
two hops, the maximum is exactly half the speeds in the chart.
However, this is optimistic as the timing has to be absolutely perfect
and the two clients should not be so close as to intefere with each
other. 30-40% of the maximum speed is more realistic.

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Wed, 11 Oct 2006 19:31:41 -0700, Jeff Liebermann
<jeffl@comix.santa-cruz.ca.us> wrote in
<9u9ri2tclmn5l67v91aj6h3i31n6h6amr3@4ax.com>:

>Doz <Doz@Doz.Doz> hath wroth:
>
>>What is the maximum possible speed for data transfer from wifi client to
>>wifi client (both PC's) on the same access point with no encryption and
>>running at 802.11g speeds (54Mbits connection) ?
>>Assume the speed of the AP is not a factor.
>
>I think(?) that what you're asking is how fast can you go from
>wireless client to wireless client through an access point. For
>54Mbits/sec that would be about 10 to 12Mbits/sec assuming 802.11b
>compatibility was disabled on the access point. If left on, figure
>about 5-7Mbits/sec.
>
>See the table at:
>| http://wireless.wikia.com/wiki/Wi-Fi...ance_and_Speed
>Those are the max speeds from one client to the access point or to a
>100baseT or Gigabit Ethernet connected computah plugged into the
>access point with CAT5 cable. In other words, one wireless hop. For
>two hops, the maximum is exactly half the speeds in the chart.
>However, this is optimistic as the timing has to be absolutely perfect
>and the two clients should not be so close as to intefere with each
>other. 30-40% of the maximum speed is more realistic.

Real world test between two notebook computers both with very good
signal on the same 802.11g network (with 802.11b compatibility turned
on): 367,118,336 bytes transferred in 4:38 (average of 3 trials in each
direction), for a net transfer rate of 1,320,570 bytes per second, or
10,564,556 bits per second.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>

John Navas <spamfilter0@navasgroup.com> hath wroth:

>On Wed, 11 Oct 2006 19:31:41 -0700, Jeff Liebermann
><jeffl@comix.santa-cruz.ca.us> wrote in
><9u9ri2tclmn5l67v91aj6h3i31n6h6amr3@4ax.com>:
>
>>Doz <Doz@Doz.Doz> hath wroth:
>>
>>>What is the maximum possible speed for data transfer from wifi client to
>>>wifi client (both PC's) on the same access point with no encryption and
>>>running at 802.11g speeds (54Mbits connection) ?
>>>Assume the speed of the AP is not a factor.
>>
>>I think(?) that what you're asking is how fast can you go from
>>wireless client to wireless client through an access point. For
>>54Mbits/sec that would be about 10 to 12Mbits/sec assuming 802.11b
>>compatibility was disabled on the access point. If left on, figure
>>about 5-7Mbits/sec.
>>
>>See the table at:
>>| http://wireless.wikia.com/wiki/Wi-Fi...ance_and_Speed
>>Those are the max speeds from one client to the access point or to a
>>100baseT or Gigabit Ethernet connected computah plugged into the
>>access point with CAT5 cable. In other words, one wireless hop. For
>>two hops, the maximum is exactly half the speeds in the chart.
>>However, this is optimistic as the timing has to be absolutely perfect
>>and the two clients should not be so close as to intefere with each
>>other. 30-40% of the maximum speed is more realistic.

>Real world test between two notebook computers both with very good
>signal on the same 802.11g network (with 802.11b compatibility turned
>on): 367,118,336 bytes transferred in 4:38 (average of 3 trials in each
>direction), for a net transfer rate of 1,320,570 bytes per second, or
>10,564,556 bits per second.

Is it my imagination or do we actually agree on something?

Did you have 802.11b compatibility enabled? Your 10.5Mbits/sec result
is what I would expect if you had 802.11b compatibility disabled and
is roughly what I predicted (10 to 12Mbits/sec) above.

However, I will admit that the 5 to 7 Mbits/sec estimate will vary
radically with router chipset and firmware. There seems to be some
work being done on dealing with the slowdown caused by 802.11b
compatibility.

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Thu, 12 Oct 2006 09:30:09 -0700, Jeff Liebermann
<jeffl@comix.santa-cruz.ca.us> wrote in
<ovqsi2502bl6u8qnobcv3a3not02cftonb@4ax.com>:

>John Navas <spamfilter0@navasgroup.com> hath wroth:
>
>>On Wed, 11 Oct 2006 19:31:41 -0700, Jeff Liebermann
>><jeffl@comix.santa-cruz.ca.us> wrote in
>><9u9ri2tclmn5l67v91aj6h3i31n6h6amr3@4ax.com>:
>>
>>>Doz <Doz@Doz.Doz> hath wroth:
>>>
>>>>What is the maximum possible speed for data transfer from wifi client to
>>>>wifi client (both PC's) on the same access point with no encryption and
>>>>running at 802.11g speeds (54Mbits connection) ?
>>>>Assume the speed of the AP is not a factor.
>>>
>>>I think(?) that what you're asking is how fast can you go from
>>>wireless client to wireless client through an access point. For
>>>54Mbits/sec that would be about 10 to 12Mbits/sec assuming 802.11b
>>>compatibility was disabled on the access point. If left on, figure
>>>about 5-7Mbits/sec.
>>>
>>>See the table at:
>>>| http://wireless.wikia.com/wiki/Wi-Fi...ance_and_Speed
>>>Those are the max speeds from one client to the access point or to a
>>>100baseT or Gigabit Ethernet connected computah plugged into the
>>>access point with CAT5 cable. In other words, one wireless hop. For
>>>two hops, the maximum is exactly half the speeds in the chart.
>>>However, this is optimistic as the timing has to be absolutely perfect
>>>and the two clients should not be so close as to intefere with each
>>>other. 30-40% of the maximum speed is more realistic.
>
>>Real world test between two notebook computers both with very good
>>signal on the same 802.11g network (with 802.11b compatibility turned
>>on): 367,118,336 bytes transferred in 4:38 (average of 3 trials in each
>>direction), for a net transfer rate of 1,320,570 bytes per second, or
>>10,564,556 bits per second.
>
>Is it my imagination or do we actually agree on something?

Your imagination. :)

( We actually agree on a great many things, but I don't see much point
in simply posting "True!" :)

>Did you have 802.11b compatibility enabled?

Yes -- checked to be sure -- on all three units (Netgear WGR614v5 set to
"g and b", Atheros AR5004G Mini PCI, and Belkin Wireless G Notebook
Card, all with latest firmware/drivers).

>Your 10.5Mbits/sec result
>is what I would expect if you had 802.11b compatibility disabled and
>is roughly what I predicted (10 to 12Mbits/sec) above.
>
>However, I will admit that the 5 to 7 Mbits/sec estimate will vary
>radically with router chipset and firmware. There seems to be some
>work being done on dealing with the slowdown caused by 802.11b
>compatibility.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>