Based on all this, would a 2.4Ghz VOIP phone have the same problems?
My guess is no because the modulation isn't constant. Just a thought...
--Rick
--Rick
On 1/23/06, Jim Thompson <[EMAIL PROTECTED]> wrote:
The required Eb/No (SNR or SINR) for 54Mbps 802.11g is a lot (*LOT*)
higher than for any modulation that one of the 'proprietary' 2.4GHz
phones use.
You can think of this as "better sensitivity" if you wish. (It
isn't, but the concepts are somewhat similar.)
the DSSS modulation envelope also makes it easier / cheaper to run
'high power' (100 - 200mW). It would not surprise me if the DSSS
modulation in the phone/base station was constant (not packet-based)
(*) while a phone call is in-progress (or the phone is off-hook).
If the above is accurate (I'm guessing, but not reaching) then the
high-power 'phone' signal will effectively set CCA on any 802.11b/g
receiver in your home, preventing them from transmitting. If one
does get to transmit occasionally (for whatever reason), then the
ability of another 802.11b/g receiver to decode the packet in the
face of the greatly increased noise floor is... nominal at best.
Technically the 'no transmits due to CCA' is not 'interference', and
the DSSS (or FHSS) modulation envelope won't be coherent to the
802.11b/g receiver, so its "noise" not "interference" as well.
Jim
(*) with a timeslot-based protocol for the various handsets
On Jan 23, 2006, at 4:31 PM, Mike Burgess wrote:
>
> I've found it takes something pretty powerfull to
> knock a phone off, but nearly anything will kill
> 802.11g
>
>
>
> --- Jack Unger <[EMAIL PROTECTED]> wrote:
>
>>
>> If you suspect interference between an access point
>> and a phone system,
>> just turn one system off and see if the interference
>> goes away.
>>
>> jack
>>
>>
>>
>> Victor Caballero wrote:
>>
>>> I am curious about what people are running into
>> with wifi and 2.4ghz phones
>>> interference.
>>>
>>> Some people say they have no problems, others have
>> all sorts of problems. I
>>> am having some unexplainable problems(static on
>> phone, wireless disconnect)
>>> and wonder if it could be the problem.
>>>
>>> Any advice or recommendations appreciated.
>>>
>>>
>>>
>>> Victor Caballero
>>> Caballero Consulting Company
>>> [EMAIL PROTECTED]
>>> 626.585.1379
>>> Www.TheTopDeal.com
>>>
>>>
>>>
>>
>> --
>> Jack Unger - President, Ask-Wi.Com, Inc.
>> Serving the License-Free Wireless Industry Since
>> 1993
>> Author of the WISP Handbook - "Deploying
>> License-Free Wireless WANs"
>> True Vendor-Neutral WISP
>> Consulting-Training-Troubleshooting
>> [EMAIL PROTECTED] (818) 227-4220
>> http://www.ask-wi.com
>>
>>
>>
