----- Original Message -----
Sent: Tuesday,
October 28, 2003 2:46 PM
Subject: RE:
[smartBridges] Slow download speed
Hi Roger,
Here are a few things you could try
to adjust in order to improve the performance,
*
Ethernet
Connection - Set to 10BaseT
half duplex
*
Ethernet
Cable - When planning your
wiring layout, try to keep cables away from power outlets, florescent lighting
fixtures, uninterruptible power supplies, and other sources of strong
electromagnetic interference. Use cable tester to make sure that Ethernet cable
pass the test.
� Adjust Fragmentation Threshold - The use of fragmentation can increase the reliability of frame
transmissions. Because of sending smaller frames, collisions are much less
likely to occur. Default value is 2346. Refer to http://www.80211-planet.com/tutorials/article.php/1468331
.
* Adjust RTS/CTS Setting - The RTS/CTS handshaking provides positive control over the use of
the shared medium. The primary reason for implementing RTS/CTS is to minimize
collisions among hidden stations. This occurs when users and access points are
spread out throughout the facility and you're finding a relatively high number
of retransmissions occurring on the wireless LAN. Default value is 2346. Refer to http://www.80211-planet.com/tutorials/article.php/1445641
for more info.
* Use Long preamble - The default is Long. Long Preamble is standard specification in
IEEE 802.11b and allows extra time for the Digital Decoder to process the
packets.
With Best Regards,
Vasu
sB Tech Support
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Roger Howard
Sent: Wednesday, October 29, 2003 2:58 AM
To: [EMAIL PROTECTED]
Subject: Re: [smartBridges] Slow download speed
1200 Kilobits per sec. which is
about what I'd expect if I was plugged
directly into the same switch as
the T1, so upload speed seems just fine. It
probably would give 400 Kilobytes
per sec. if I had a local test server to
test the throughput before the T1.
I'll try switching to channel 1 if
the new power supply doesn't help.
Thanks,
Roger
----- Original Message -----
From: "Colin Watson"
<[EMAIL PROTECTED]>
To:
<[EMAIL PROTECTED]>
Sent: Tuesday, October 28, 2003
12:40 PM
Subject: Re: [smartBridges] Slow
download speed
> 1200Kbit/s? or 1200
Kilobyte/s? - We get about 400 Kilobyte/s (400Kb/sec)
> throughput to our backlink.
It'd be worth checking the smartbridge
> statistics, see if their is a
high number of errors on the ethernet side.
> Also (I don't know if you can
do this on SmartBridge AP's) you may have a
> statistic to show the number
of retries the customer is experiencing -
High
> retries will equate to low
throughput. If they have got a high number of
> retries, check their signal
strength they get back to the AP client-->AP,
> and finally, check for local
2.4 interference.
>
> ----- Original Message -----
> From: "Roger Howard"
<[EMAIL PROTECTED]>
> To:
<[EMAIL PROTECTED]>
> Sent: Tuesday, October 28,
2003 6:06 PM
> Subject: [smartBridges] Slow
download speed
>
>
> > I just installed an APPO
on Sunday, with 3' of LMR400 going to a Pac
> > Wireless 16dbi 90 degree
horizontally polarized sector antenna. It's
100'
> > high on the side of a water
tower.
> >
> > I'm seeing significantly
improved signal strengths at customer sites
than
> I
> > was getting with the old
14.5dbi Maxrad on my first access point, but
> > download speeds are
terrible. I'm seeing around 1200k upload speed
fairly
> > consistantly (figure my
T1 is the bottleneck there) but the download
speed
> > is very variable.
Anything from the test failing, or maybe 90k or
> sometimes
> > several hundred k. When I
switch back to the original access point
(rotate
> > the antenna for correct
polarity) the performance improves.
> >
> > Does anyone have any idea
what may be causing this? I'm going to try an
> 18v
> > power supply since there
is about 150' of CAT5. Any other ideas what
might
> > be causing it? I'll
confirm soon whether the 18v helped.
> >
> > Thanks,
> > Roger
> >
> >
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