I am highly interested in the report and would appreciate receiving the
mentionned report.
Thanx in advance,
Ha Nguyen
Univeristy of Lausanne
On 05/10/2012 09:10 PM, David J Molta wrote:
I had some students do a project this semester where they compared
aggregate throughput on a standard 3-channel model and two alternative
4-channel models. This was Cisco 2-stream 11n, a single client running
iXChariot downstream throughput test.
3-Channel (1,6,11)185 Mbps
4-Channel (1,4,7,11)153 Mbps
4-channel (1,4,8,11)98 Mbps
They also ran a 3-channel test, 4 AP's with two AP's on Channel 1, the
other two on 6 and 11. The goal here was to assess the incremental
improvement in capacity when two AP's are contending for use of a
common channel. Aggregate throughput in that scenario was 160 Mbps but
the thing that was most interesting about that test was that the two
AP's did not share the channel evenly. One AP on Channel 1 got 58 Mbps
of throughput while the other got 12 Mbps. These tests appear to
support the hypothesis that adding more AP's in a dense configuration
in the 2.4 Ghz band does not result in significant added capacity when
AP's are experiencing co-channel interference. It is important to note
that our tests focused on downstream throughput, which would probably
be the worst-case scenario for co-channel interference.
I had another team perform some testing of Ruckus' ChannelFly
technology, which often uses non-standard channels. In that testing,
we have noted modest improvements in performance compared to the
classic 3-channel model.
I'd be happy to share the report with people who are interested.
Dave Molta
From: Lee Badman <[email protected] <mailto:[email protected]>>
Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv
<[email protected]
<mailto:[email protected]>>
Date: Tue, 8 May 2012 14:34:19 +0000
To: <[email protected]
<mailto:[email protected]>>
Subject: [WIRELESS-LAN] 4-channels in 2.4 GHz
With no intent to open a conversational can 'o worms, I'm curious if
anyone is running a 4-channel plan on their production WLANs, that is
willing to share their opinions and experiences on the topic.
Thanks-
Lee
Lee H. Badman
Wireless/Network Engineer, ITS
Adjunct Instructor, iSchool
Syracuse University
315.443.3003
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