Re: Netgear DG834GT no 108mbps mode

I agree, the DG834GT only works sensibly if you using the setting that
allows it to drop to lower speeds if required (108Mb auto).

The problem is that if the monitor program is correct, it always drops to
54Mbit when transferring any amount of data, and I have never seen data
transfer rates that show that there is an operational 108Mbit connection, so
why did I bother spending extra money on this router?

Another reply suggests using Draytek routers. I agree. My Draytek worked
fine until it was killed by lightning. I should have stuck with them.

Another problem with the DG834GT is that if you use the 'idle timeout', then
when it reconnects, the internet connection is not properly functional, and
this can only be fixed by either resetting the router, power cycling, or
resetting the value of the timeout (?). I exchanged messages with their
support people, but gave up as they never seem to read previous replies, so
you find yourself going round in circles.

I now have an unecessarily expensive 54Mbit wireless router that can only be
used in 'alway on' mode.

--
Nigel D

On Sun, 28 Aug 2005 13:28:02 +0100, "Nigel D"
<annonymous@microsoft.discussions> wrote:

>I agree, the DG834GT only works sensibly if you using the setting that
>allows it to drop to lower speeds if required (108Mb auto).
>
>The problem is that if the monitor program is correct, it always drops to
>54Mbit when transferring any amount of data, and I have never seen data
>transfer rates that show that there is an operational 108Mbit connection, so
>why did I bother spending extra money on this router?

[I didn't see the original posting on my newsreader so I'm replying to
the reply].

It really depends on the distances involved and whether you're picking
up any interference. Also the 802.11b compatibility mode will wreck
performance.

See:
http://www.tomsnetworking.com/Sectio...le60-page5.php
Note the graph. It's a "walk test" comparing a 54Mbit/sec device with
a 108Mbit/sec device. The dip in the middle is about 300ft away.
Note that the average performance when close to the access point is
considerably better with 108Mbits/sec when very close but drops off
quickly with distance. Also note that it slows down when too close to
the access point. That's a timing issue.

The 802.11b compatibility mode will wreck performance. The access
point has to listen for 802.11b devices periodically. If it finds
even one 802.11b packet, it will slow down for a considerable time
slice listening for more 802.11b packets.

This is stolen from an Atheros PDF at:
http://www.atheros.com/pt/athe ros_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

The above is with encryption disabled. Drop the numbers by about 15%
for encryption enabled.

If you're hearing interference, the access point will immediately slow
down to a slower speed. It doesn't matter what type of interference,
if the S/N ratio drops, so will the connection speed. At 108Mbit/sec,
it doesn't take much junk to slow things down.


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