From: Matt Mullen (mullenm@gmail.com)
Date: Tue Oct 11 2005 - 11:14:40 GMT-3
Hi,
I would recommend picking up a copy of the Cisco Press book
"802.11Wireless Site Surveying and Installation" ISBN 1-58705-164-8.
In Ch. 11 pg.
259 there are some handy tables which show the absolute and recommended RX
thresholds at your cell boundaries. For example, for 54Mbps coverage it
lists the absolute minimum RX threshold of -71, recommended minimum RX
threshold of -61, absolute minimum SnR of 25, and recommended SnR of 35. It
lists these recommended values for all of the 802.11a/b/g data rates and
also goes on to cover the recommended values if you are going to be running
voice on the wireless network. I take these tables with me any time I do a
survey as a general guideline to follow. There's also a lot of other good
information about performing surveys in the book. For online information,
there is also some good information in the SRND for wireless at
http://www.cisco.com/go/srnd
This doc shows the radiation patterns for most of the antennae:
http://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet0918
6a008008883b.html
HTH,
Matt
On 10/11/05, AM <am_1974@yahoo.com> wrote:
>
> Hi All,
>
> I will be performing a site survey for a small scale
> wirless deployment at my company. Can anyone help me
> out with following questions. TIA.
>
> 1. Can you point me to a document that discusses
> acceptable Signal/noise ratio.
>
> 2. For coverage purposes, is there a industry best
> practice for signal strength. I know that it will
> depend on how many clients and bandwidth required per
> client. But I was wondering if there is document that
> discusses that to stay within -70 db level etc.
>
> 3. Can you point me to a document that discusses
> different Antennas and their coverage pattern.
>
> Thanks.
>
>
>
>
>
>
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