Re: PING: Jeff Liebermann - Netgear WGT634U Storage Router Info!

On Sun, 04 Sep 2005 20:45:53 GMT, Jim Donald <jim_donald@xxxxxxxxxxx>
wrote:

>I think Netgear have missed an opportunity here, because I guess there
>will be lots of people who would like an FTP server without having to
>run a dedicated PC (with all the noise and everything).

Well, I don't think the ftp server is the popular feature. Methinks a
web server would make more sense.

>However, I am still a little perplexed. On ONE of the networks I
>appear to be getting an 'excellent' signal (48-54Mbps) but when I
>start to FTP on the LAN the stream drops to 1Mbps.

Let's see if I got this right. When you connect via wireless, you get
a 48-54Mbit/sec association. However, when you start to move data, it
drops to 1Mbit/sec. Well, the first thing to try is turn off all the
other wireless devices and see if they're part of the problem.
Probably not, but it pays to make sure.

There was a also a nasy bug in the Intel 2200BG driver that caused
everything to slow down to 1Mbit/sec and not recover.
> http://groups.google.com/group/alt.internet.wireless/browse_frm/thread/b408cbd5b2cc46b8
>

>At other times the
>transfers start fairly fast but then drop down to 1Mbps again. I'm
>using Netgear WG111 with the WGT634U and it only happens on this one
>machine and this one Network.

My seat of the pants guess is that it's the client radio or driver.
If this client radio works with the other WGT634U, then it's certainly
the WG111 or the driver. Try it.

>Also - this usually happens when I'm
>trying to transfer a group of files. The first few files start at
>around 36Mbps but then everything just slows to a snail's pace.
>
>I've tried re-siting the router and my antenna but to no avail.
>
>Would there be any advantage in upgrading to a faster USB adapter on
>the troublesome machine

No.

>- something that could take advantage of the
>WGT634U's 108Mbps capabilities? Is 108 Mbps actually achievable? It
>seems a lot for wireless.

I've never seen thruput over about 50Mbits/sec. The thruput is
usually about half the connection speed. 54Mbits/sec maxes out at
about 30Mbits/sec. With 108Mbit/sec connection, you'll get about
50Mbits/sec thruput. However, the range will be very limited.

his is stolen from an Atheros PDF at:
http://www.atheros.com/pt/atheros_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


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

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