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how long should it take to transfer a 700mb file using 802.11b

H

holden j caufield

Diamond Member
I've got a PC upstairs and downstairs and transfering a 700mb file takes almost an hour. Both are connected at 11mb. I'm thinking it should take much less time
 
From a purely mathematical standpoint, it would take just under 9 minutes, but you have to account for TCP overhead of approx 10%, so say 10 minutes. What does your signal look like? I believe the bandwidth at the AP is split between the two clients. In other words, one PC sends at 5.5mbps and the other receives at 5.5mbps. Not entirely sure on that however. There are just so many factors when it comes to wireless. What I would recommend is using a utility like netstumbler to see your signal strength, signal to noise ratio, etc. Based on that you can try to fine tune the setup.
 
Originally posted by: JackMDS
If you have a good 802.11b it would take about 30Min.

:sun:
Click to expand...

agreed, even longer with normal wireless.

keep in mind that all communication is to the AP on the same bandwidth, so transferring files from one wireless client to another is excruciating slow.
 
Eleven megabits is a signaling rate, not a throughput. 802.11b is (as mentioned above) ~5 megabits or so (under perfect conditions). Add a little interference or weaken the signal enough, and it'll downshift to ~two megabits, then one ... another factor is the signal quality; you can have 100% signal strength and crap for signal quality, due to interference and / or multipath.

On top of that, the AP doesn't transmit and receive at the same time (even if it has two antennas; they're there for "diversity" - to improve signal quality).

So the frame comes in, gets buffered, then get transmitted out to the other wireless client .... just like a repeater ... throughput drops to half.

Transmission from wireless to wired clients should be roughly twice as fast.

You could probably speed up the transfer between the two wireless clients by using "ad-hoc" mode, so you are transmitting directly to the other station (eliminating the store-and-forward).


FWIW

Scott

 
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