From: Jonathan Hays (nomad@gfoyle.org)
Date: Thu Apr 29 2004 - 10:07:09 GMT-3
How far your signal will reach is quite variable and there are no
guarantees. Reachability to the AP is highly dependent on the
environment.
It varies with the frequency. Don't forget that you won't always be
operating at 11 Mbps on 802.11b - your connection will automatically go
to a lower frequency under adverse conditions. In fact, the lower speeds
typically increase the range. I've seen figures of 100 feet at 11 Mbps
and 300 feet at 1 Mbps in the literature.
Here are some additional factors to consider that affect wireless
reachability:
- Signal strength:
* transmitter power varies for both the AP and wireless adapters
* antenna gain
* floor plan
* client locations
* attenuation because of stationary physical objects
* presence of other APs
- Signal obstacles:
Metal objects are the worst, but there is a whole range of obstructions
that affect RF attenuation, from the low attenuation of wood, glass, etc
to the high attenuation of paper, ceramic with metal backing, concrete,
metal, the silvering on mirrors, etc.
- RF Interference:
* microwave ovens
* cordless phones on 2.4 GHz and 5 GHz
* electric motors, monitors, refrigerators, etc
- Signal pattern of radiation from the AP antenna:
AP placement is a factor here. Also you have to consider the directivity
or gain of AP antennas and wireless adapter antennas.
I'm sure that more experienced wireless engineers could easily double
this list.
HTH,
Jonathan
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
>Behalf Of McCallum, Robert
>Sent: Thursday, April 29, 2004 3:55 AM
>To: 'Hunt Lee'; ccielab@groupstudy.com
>Subject: RE: Wireless - OT
>
>
>No its not true at all. We have an access point which is
>about 200m away
>from the canteen in my work.
>I can still use the wireless from the canteen (don't know if
>this is a good
>thing or a bad thing !).
>
>Robert McCallum
>CCIE #8757 R&S
>01415663448
>07818002241
>
>> -----Original Message-----
>> From: Hunt Lee [mailto:Hunt.Lee@telecom.co.nz]
>> Sent: 29 April 2004 01:59
>> To: ccielab@groupstudy.com
>> Subject: Wireless - OT
>>
>>
>> Hey Group,
>>
>>
>>
>> Sorry to be off-topic =)
>>
>>
>>
>> Is it true that for all wireless cards (USB/PCMCIA), that
>> they could only reach for a maximum of 100m?
>>
>>
>>
>> Is there any way you can increase / extend the range?
>>
>>
>>
>> Thanks so much for your help,
>>
>> Hunt
>>
>>
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