Radio Signal Diagram - CAP1602I

[samer.hasan]

Hellooo,

i will be having the:

WLC: AIR-CT2504-50-K9 and having another WLC for HA

and

AP: CAP1602I

what i am concern of is the signal diagram, or the broadcast diagram for this access point?

how the AP signal will be Distributed around here,will it be a circle or in which shape ?

[Scott Fella]

Signal varies depending on attenuation from objects in its path. There is no real shape you can compare the signal coverage to. A site survey using a tool can capture signals and show you the signal coverage pattern.

In an open field with nothing around, the signal will propagate in a circle. Once you start putting object in, them that theory goes away.

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[samer.hasan]

what i want is will the signal shape be like ths or what is the real broadcast shape:

i hope i deliviring the info correctly.

[Scott Fella]

The AP is an omni, so the signal will propagate in a circle.

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[samer.hasan]

Thank you,

but what is the recommended distance from the client and the AP

and the recommended distance from an AP and the other AP

[George Stefanick]

Client to ap depends on what applicant .. Data = 75 dBm voice = 67 dBm (edge) also keep in mind this is assuming an accurate link budget

Ap to ap in same channel you need a minimum of 20 dBm

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[samer.hasan]

can we convert the dBm values to distance in meters

[George Stefanick]

If you whisper something and I say I heard it at -90 dBm and then you yell at me and I say I heard you at -50 dBm .. All depends on how loud your ap is tx, antenna gain, and antinuation

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[Mark Withers]

You can... sort of.

Your RSSI is a measure of how much "volume" is lost, as in George's example. This gives you the basis of how to lab this out and get your own readings.

Lab this out in a relatively open area, eg auditorium, lobby, etc... or better yet on site. Set up the AP, take your most representative client device and--if the client device doesn't show signal strength in RSSI--a smartphone with a wifi app that shows RSSI (there are abundant examples).

Step one meter away, refresh smartphone RSSI readout, run standard operations representative of daily operations with the client device. Document your findings as to distance, RSSI, and acceptability of client device operations.

Repeat until you find where your client device is unacceptable. This should give you a baseline understanding of ROUGHLY what to expect. You will have different interference patterns from client devices, APs, microwaves, physical obstructions, etc etc etc. Use these as your numbers, and ensure anyone who sees your distance chart understands it is NOT 100% accurate in all situations, just a rough guess to help you decide how far is too far from the AP.

Technically it will NOT tell you how far is close enough to the AP! This is due to all the possible interferences and variances... but it can help you plan a whole lot better.

[George Stefanick]

There are planners you can use to guess on coverage. Always best to do an active survey ..

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