Wireless Access

Reply
Occasional Contributor II

site survey

Hi,
Why the threshold value minmimum -82
Channel Overlap Max(2) at .....at min(-82)dBm..

Thanks

 

 

 

Re: site survey

It means that at any given position you should not hear two APs on the same channel at above -82dBm.

 

This would be to minimize co-channel interference in your design. You should consider the threshold values for each deployments requirements and configure them accordingly.

 

Cheers,

Christoffer Jacobsson | Aranya AB
Aruba: ACMX #537 ACCP | CWNP: CWNA CWDP CWSP CWAP
Occasional Contributor II

Re: site survey

Hi,

Is there any specific reason for value -82 

 

Thanks

 

Re: site survey

It´s the value used by the client to determine if the wireless medium is busy or available. Hence if there´s a signal from another source on the same channel higher than -82dBm your client will wait to transmit. (Co-channel interference or contention)

 

Cheers,

Christoffer Jacobsson | Aranya AB
Aruba: ACMX #537 ACCP | CWNP: CWNA CWDP CWSP CWAP
Occasional Contributor II

Re: site survey

Hi,

You mean station A is on channel 36 associated to an AP A and station B associated to AP B 

if station A hear station B on at -82dBm,it will wait ? 

what if it is   -86.

there will not be any contention 

Thanks

Re: site survey

That sounds correct, yes. Asuming AP A and AP B are both on channel 36.

 

Cheers,

Christoffer Jacobsson | Aranya AB
Aruba: ACMX #537 ACCP | CWNP: CWNA CWDP CWSP CWAP
Occasional Contributor II

Re: site survey

Hi,

why the standard threshold is -82 dBm .In some suvey tool the default value is -86 dBm.

"he thresholds for both carrier sense and energy detection are predefined in the standard. For 802.11a the carrier sensitivity is ­82 dBm and the energy detection threshold is ­62 dBm." 

 

What is the reason behind this standard value 

 

 

 Thanks

Search Airheads
cancel
Showing results for 
Search instead for 
Did you mean: