Clean Air

[Scott_O'Brien]

Hi All,

with Clean air what is the main advantage of using this?

also if you have a network with older AP's that dont support Clean Air how are they going to work together?

and one more qustion if you are using omni-directional anteners is there much diffrence in range in you get external or internal annteners?

Thanks

Scott

[Srinivasaraghavan Parthipattu]

Advantage of clean air is the AP has a Spectrum analysis capability to figure out the interferences areas coming from.

External antennas ( Omni directional) each have different radiation pattern the vertical beamwidth degrees or angle differ from one to another type suitable to your requirements. Refer to antenna guide and accessories.

http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008008883b.html

Srini

[Nicolas Darchis]

Hi,

1) Advantage of cleanair : you are asking vague questions.

All you need to know about Clean Air:

http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080b4bdc1.shtml.

And FAQs:

http://www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080b4bdc1.shtml.

2) A 3500 (cleanair) AP is just like a 1260 but with an additional chip that detects interference like nothing else can do. So it's still a normal access point. It can just detect what is the interference type it is suffering (bluetooth, microwave oven, ...). So interoperability is not really a question, they are still "normal" APs functionning as such. They won't consider older APs as interference if that is your question.

3) The difference is that the internal antenna is not really omni.

An external omni is like a donut shape. While 1130/1140 are made to mount on ceiling and cover a dome under them. Check out the antennas radiation pattern to see the difference.

Hope this helps.

Nicolas

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[Scott_O'Brien]

thanks for your answer.

in regards to number 3 my quustion was more on if i get internal anteners are they going to have as good a range as external anteners, will they be as goog as external anteners in letting the signal go through wall's?

[Nicolas Darchis · Accepted solution]

It's not a matter of internal or external. It's a matter of the gain they have.

The internal antennas of the 1140 are as such :

2.4 GHz, Gain 4.0 dBi, horizontal beamwidth 360°

• 5 GHz, Gain 3 dBi, horizontal beamwidth 360°

You can buy external antennas with the same gain. In that case, they pretty much have the same effect.

If you buy a directionnal antenna with 12dbi gain for example, your signal will mostly go in one direction only but will have a much better penetration/strength in that direction.

Regards.

Nicolas

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[Scott_O'Brien]

thanks for that, so basicly there is no diffrence with internal or external annteners if they are

omni. so external is only really a big thing if you plan on using a yagi.

thanks

[Nicolas Darchis]

More or less.

You could have an antenna that is still omni but that gives 6dbi, so nearly double the range. The drawback is less coverage above and below (usually not a problem if you only cover 1 floor of normal height).

So it's pretty much about gain and about coverage pattern.

Nicolas

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