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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