I tried it, the system only takes whole numbers between +128 and -128 (wouldn't an antenna with 128dbi of gain be interesting?)
It is my belief (as in, it makes sense to me, I haven't really read anything about it) that the AP may use that number to "throttle back' the gain to keep the EIRP in compliance with the region's standards (though, there's no field for "What kind, and how much cabling are you using?" which would be the other factor for that calculation).
Since I do mostly indoor systems (and only a very few at that), I have never paid much attention to that field.
The "Help" screen for that setting says:
The gain of an antenna is a measure of the antenna's ability to direct or focus radio energy over a region of space. High-gain antennas have a more focused radiation pattern in a specific direction. This setting is disabled on the bridge
-not a lot of help, what a surprise ;-}
Another other reason for putting that field in the config screen might be to keep the AP roles in-line with the antennas used (like: someone tries to put a 24db dish on an internal AP setting at full power and roasts all of the users).
It might be like the "bandwidth" statement on a router ... it doesn't actually affect the operation, but it does provide a value that the WLSE/management platform can use to map the radiation pattern.Though, on the WLSE mapping graphics, it permits you to enter the antenna type and height above the floor (no real reference for outdoor installations ....).
Next time I break out the field strength meter, I'm going to see if it does in fact actually throttle back the power or if it's just some kind of reminder / reference.
I'll see what I can find on it. So much for quick assumptions :) ...
As usual your humour is at its finest, and one of the reasons I love reading the posts on this forum! There probably are some users that we all wouldn't mind roasting :) (just kidding). Here is a tech note that seems to indicate that this setting has no actual bearing on the performance of the antenna, but is more of a reference or way to know the antenna attached to the AP without actually seeing it.What do you think?
Note This setting does not change the antenna gain, it is used to identify the gain of the installed antenna(s).
Note The antenna gain value is listed on the user document that shipped with your antenna.
I've done some testing in a live environment where we varied the antenna gain from 0 to 5 to 10 for a dipole antenna whose gain is 5.2. There was a difference in the cell size at each setting but it was not consistent around the whole cell and really it made little difference.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...