Does the wireless lower the band width?

Does it ?


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Franconero wrote:

> Does it ?

The width of a band is usually 6-10, but depends on the width of the street;
tubas and french horns lower the band's width. ;-)

I don't know what your real question is, so I'll answer a couple:

1. WiFi links do dynamically change data rate based on signal quality
and interference.

2. WiFi links are typically slower than wired links: for today's typical
SOHO links, 54 Mb/s < 100 Mb/s.

3. WiFi links are typically less efficient than wired links, due in part to
protocol differences. Sustained disk-disk transfers over a decent SOHO
100 Mb/s wired path show >75% of that 100 Mb/s; my expectation for a
comparable infrastructure WiFi path are more like 25-50% of that 54 Mb/s,
and can be far less with interference.

4. With two good PCs connected to a DSL/cable modem, one via a wired 100 Mb/s
link to a router and one via a 54 Mb/s WiFi link to the same router, both
PCs should get about the same sustained download speed from the web,
because most DSL and cable connections are much slower than either wired
or WiFi links.

--
Cheers, Bob

"Franconero" <nero.franco@gmail.com> hath wroth:

>Does it ?

Bandwidth and thruput are two different animals. You can have an 8
lane freeway, but if the traffic is bad, you're not going to be moving
very fast.
http://en.wikipedia.org/wiki/Throughput
http://en.wikipedia.org/wiki/Latency_vs_Bandwidth

If you're playing games on your local LAN, you're probably using a
100baseT-FDX (full duplex) connection, which will have a maximum TCP
thruput of about 80Mbit/sec. UDP is somewhat higher (because it
doesn't require ack's). If you add 802.11g wireless to the network,
your thruput will be about 25Mbits/sec maximum. See chart at:
| http://wireless.wikia.com/wiki/Wi-Fi...ance_and_Speed
Note that this is under ideal conditions (no interference, strong
signals, no reflections, etc). A tolerable rule of thumb is that
thruput is about half the wireless connection speed.

You might be able to go somewhat faster with non-standard
technologies, such as Turbo-G, MIMO, Afterburner, and such. The
fastest sustained thruput I've personally seen is about 50 Mbits/sec
TCP with a Linksys SRX (Airgo) system. See:
| http://groups.google.com/group/alt.i...a8efd2638d674b
for my comments on some of the technology.

Of course, if you're running your games over the internet, then
maximum thruput will probably be limited by the speed of the internet
connection. As long as the wireless thruput is somewhat faster than
the broadband connection, it will have little effect.

--
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

Good to see that there is still someone around who
knows the diference between bandwidth and throughput!!