[mythtv-users] Wireless Pre-N for Linux?
steve at blighty.com
Mon Mar 26 22:18:13 UTC 2007
On Mar 26, 2007, at 2:59 PM, Johan Venter wrote:
> Brian Wood wrote:
>>> get anything better than about 20Mbps sustained throughput.
>> Remember that the manufacturers can't even agree about what a MB or a
>> GB is, even when they admit they are using 1000 instead of the more
>> correct 1024 they still state categorically that "actual capacity
>> will be less", and they specify "unformatted" capacity, as if anybody
>> ever could or would use an unformatted drive.
> Actually, when talking about the capacity of a wireless link (and data
> rate in general, I believe) one always uses powers of 10 rather than
> powers of 2.
> Thus, stating a theoretical maximum throughput (when is then
> effected by
> free space loss, fading,
> thermal/intermodulation/crosstalk/impulse/whatever noise) is much
> different to blatantly putting the wrong numbers on a hardrive.
> The theoretical Mbps of a wireless link is calculated based on its
> frequency and bandwidth such that even honest people would come up
> the same answer :)
> However due to interference you can generally take the theoretical
> throughput and chop it in half: not many people will get more than
> 25-27Mbps out of an 802.11g link.
And then you need to chop it in half again to get the usable bandwidth
for data. once all the framing overhead is taken into account.
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