Antenna type on an AP

Is there a way to figure out what type of antenna is connected to an AP either by logging on to the capwap AP or through the controller or thought the WCS?

I agree with Leo. There is no way to know what type of antenna you use. Antenna is a dump device and it has no way to communicate with the AP. The AP will try to transmit the signal with or without an antenna so it does not even know if an antenna is really exist.
Why you want to know the type of the antenna?
Rating useful replies is more useful than saying "Thank you"

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Antenna type in WCS / WLC

Hello, I am still somewhat new to the wireless side and I saw something today while trying to troubleshoot a wireless issue we were having that I have not heard or read about from my CCNA Wireless studies. I noticed that the antenna types our WCS is showing attached to my APs are wrong.
My question is, do the APs / WCS / WLC know what type of antenna is connected to the APs automatically or is this a manual process that someone should assign them? The second question is, if it is a manual process (which I suspect it will be) can I change it without disrupting current connections or should I wait until a maintenance window to do this?
We have 3502e AP with AIR-ANT-1728 and AIR-ANT-5150V-R antennas attached to them, but my WCS says they have the rubber duckies on them. Any insight would be greatly appreciated.
Thank you in advance for any help you can provide!

There is no way the WLC even knows what antennas you have. If your using antennas besides the rubber ducks then you need to define that on WCS. If you have Cisco antennas, there is a drop list of the antennas. You also have to make sure of the antenna orientation. This is all defined in the WCS user guide.
Note
If you have a ceiling-mounted AP with an integrated omni-directional antenna, the antenna orientation does not really need to be set in WCS. However, if you mount that same AP on the wall, you must set the antenna orientation to 90 degrees.
Sent from Cisco Technical Support iPhone App

AIR-CAP1552H-M-K9 coverage area with AIR-ANT2547V-N antenna type.

Hi,
i just want to take information regarding access points coverage are of AIR-CAP1552H-M-K9 while i am using ANT-ANT2547V-N antenna type. will these access points can join the WLC 2504 easily and can work on mesh mode.Second thing is these access points have the Ethernet port for connecting switch.

Hi Sandeep,
I am using WLC 2504 and not able to getting the GUI interface. Kindly help me
Interface Name................................... management
MAC Address...................................... 50:06:04:ca:85:40
IP Address....................................... 192.168.1.1
IP Netmask....................................... 255.255.255.0
IP Gateway....................................... 192.168.1.2
External NAT IP State............................ Disabled
External NAT IP Address.......................... 0.0.0.0
VLAN............................................. untagged
Quarantine-vlan.................................. 0
Active Physical Port............................. 1
Primary Physical Port............................ 1
Backup Physical Port............................. Unconfigured
Primary DHCP Server.............................. 192.168.1.100
Secondary DHCP Server............................ Unconfigured
DHCP Option 82................................... Disabled
ACL.............................................. Unconfigured
AP Manager....................................... Yes
Guest Interface.................................. No
L2 Multicast..................................... Disabled

WRT54G Ver.#6 Antenna Type Question

Hi,
I've tried my best to find the information I need concerning the actual type of connectors that are used on the factory installed antenna's that come on this router. I looked on the wrt54g specification page for this router, and it doesn't specify what they are. I'm really hoping that someone in here can tell me.
Thanks,
David

I'm pretty sure it's a standard BNC connector.

Wireless Location AP Density and Antenna Type

Does anyone have recomendations for the density for AP's for use with WCS location? If I use the 3 AP's required for location triangulation in an area (300x200 feet) (with omni antennas) I get great wireless coverage throughout the area, but I get lousy location tracking. If I choose inspect location readiness most everything is red with only a couple little specs of green. If I add 3 more ap's (for 6 total) I get about 20 % of the area only showing location readiness in the green with everything else red. Does anyone have any thoughts as to how dense AP's should be for tracking and what the best antennas to use would be.

I had seen that document, but now reviewed it in further depth. I find it interesting (and somewhat expensive) to see that for acurate location information Cisco recomends AP's every 50 linear feet. Running the planning mode recomends 26 AP's rather than the 6 I now have in place, even though the 6 provide great RF coverage, they don't seem sufficiant for location.
That being said if I do add 20 more AP's what would the best antennas for this application be? I'm assuming I should not use all 5 Db 1728 antennas as those are probably way overkill. What do you think?

How to add antenna types to WCS

I am running WCS 6.0.170.0 and don't have the option for an AIR-ANT5160V-R. Is there a way to add additional antenna's to the WCS or do you have to upgrade your software?

Depending on the version of your WCS ...
Go to Configure > Access Point > choose the AP of your choice > under Radio Interface choose 802.11a/n > under Antenna is External Antenna drop down box.
Please don't forget to rate our useful posts. Thanks.

Possible to mount off the external antenna of the MSI AP11B?

Hi! I am thinking of buying the MSI AP11B Acces Point. But is it possible to mount of the external antenna, and mount another antenna to boost up the signal?
Best Regards

First I want to tell that my english is very bad ..
The external antenna basicly is a RF cable and nothing more. Put one RF conector on this short cable (aprox 5-6 cm) and attache an external antena. You must change in web settings antenna type for external ....
Inside the AP you find a internal patch antena. In diversity mode the AP use both.
Regards

REPLACEMENT WIFI ANTENNA FOR F4580 DESKJET ALL IN ONE PRINTER

HI I WONDER IF ANY OF YOU GUYS AT HP CAN TELL ME WHERE I CAN GET HOLD OF A REPLACEMENT WIFI LEAD/ ADAPTER/ ANTENNA TYPE LEAD THAT PLUGS INTO THE BACK OF MY DESKJET F4580 ALL IN ONE PRINTER , ITS SORT OF 8mm SQUARE IN SHAPE THANK YOU FOR YOUR TIME

Was the printer purchased on one country but you are in another? If so you will need to Contact HP to request a "Regionalization Reset". There should not be any charge for this, it is covered as part of the cartridge warranty. You will need to have access to your computer and printer while on the line with HP. You will also need to have a set of cartridges for the new region, once the reset is complete cartridges from the original region will no longer work. HP's web page on the subject is here.
You can find the correct cartridges for your area from the HP SureSupply site.
Bob Headrick, HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

Getting information about antenna

Hello, how can i gather information about antenna type (its PN at least) if i have no physical access to the AP, only telnet session?

Hi Mikhail,
This is a question that surfaces from time to time and sadly there is no method to gather this info remotely. Here is a recent thread with this discussion;
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=WLAN%20Radio%20Standards&topicID=.ee6e8c2&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cc13c94
Hope this helps!
Rob

1131 AP Shows as having "other" antenna in the WCS

I just installed 5 lightweight 1131 ap's, two of them show up as having " other " as the antenna type in my WCS , the others show as having Ajax-Omni. They all have the same code and were installed at the same time. Also I can't get a het map profile from the " other " listed AP's. Can anyone help?
Thanks
Bill

1. You can go to Monitor Map ---> Campus ---> Select Building ---> Select Floor ---> From the drop down menu select command, choose "Position AP" and Go .
2. Click on the problematic AP's 1131 and select the correct Antenna type as being "AJAX-OMNI" which the image should match for AIR-LAP1131AG-A-K9.
3. Click Save and the heat map should start to populate.
4. From Floor Settings, select Access Points --> Protocol "802.11b/g/n" or 802.11a/n but not both. It's has to be one or the other else the heat maps will not display.
5. From Floor Settings ---> AP Heatmaps --> Contributing APs, Select ALL the APs and OK.
-nael

Proper use of 'patch' antenna

I have acquired a number of the flat patch antennas, and I am looking for some guidance in deploying them properly. I am using cisco 1200 AP's (b/g only), and in some area's I do not need 360' coverage, the patch antennas are better suited, but I cannot find any definitive guidance on their use. Should they be installed 2 per access point, or is their no benefit to using them in pairs? If I can use them in pairs, what is the optimum placement (there are 3 foot cables on the patch antennas). In one large room (appx 76' across, 66' deep), if I could install them in pairs, should they be slightly angled out and down to provide better coverage, or would that make no difference? I have seen the pages that show the coverage by antenna type, but I was looking for some detailed installation guidance for non engineers.
Thanks,
Gene

Hi Gene,
The use of two Antennas is generally referred to as Diversity mode. They are used
in a "pair" type config to mitigate "Multipath"
In a multipath environment, signal null points are located throughout the area. The distance an RF wave travels, how it bounces, and where the multipath null occurs are based on the wavelength of the frequency. As frequency changes, so does the length of the wave. Therefore, as frequency changes, so does the location of the multipath null. The length of the 2.4 GHz wave is approximately 4.92 inches (12.5 cm). The length of the 5 GHz wave is approximately 2.36 inches (6 cm).
In order to increase coverage, conduct a site survey to determine the RF coverage of the antennas. Place access points in the appropriate areas of the installation site. The purpose of diversity is to overcome multipath reflections. Diversity antennas that share the same physical housing are placed at an optimum distance apart. The maker of the particular antenna determines that distance based on the characteristics of the antenna. When you use a pair of antennas with matching characteristics to provide diversity for cell coverage in your facility, the guideline is to put those matched antennas at a distance apart from each other that is equal to a multiple of the wavelength of the frequency that is being transmitted. The 2.4 GHz wavelength is approximately 4.92 inches. Therefore, to support diversity on a 2.4 GHz radio with two separate antennas, the antennas should be spaced approximately 5 inches apart. The antenna pair could also be spaced at multiples of 5 inches, but the distance between should not exceed 4 multiples: reflected waves farther apart than that are likely to be so distorted and different in delay spread that the radio could not work with them.Because each antenna is selected by itself, both antennas must have the same radiation characteristics and be positioned to provide similar cell coverage. Two antennas connected to the same access point must not be used to cover two different cells.
From this good doc;
Multipath and Diversity
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml
If you provide the patch model #'s we can provide some mounting/installation instructions.
Reference Guide;
https://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008008883b.html
Cheers!
Rob

Antenna Parameters

Hi
Im upgrading a WLC HW from WLC 4400 to WLC 5508 and my question is, what will happen to the ap parameters like antenna gain, antenna type that is set on the WLC under radio settings for each ap.
Is this info stored on the AP or is it on the WLC , so this wil disappear when the ap join the new WLC.
I had not planned to do a restore from the old WLC to the new one.

You will need to re-enter the external antenna configuration.
If the external antenna has similar power of the internal antenna, don't waste your time.
However, if you are using a high-gain antenna then it's worth the while to configure the power.

WCS - Antenna Detection Issue

Hi,
I'm installing a WCS solution with 3 controllers 5508 and 70 access points. (AIR-LAP1041N-E-K9)
Everything is working fine but i have 1 issue with WCS and RF.
When i add some Access Points into the maps, some are working fine but others not.
I've got this message :
"RF Prediction will not be computed for the following APs since these APs have Unsupported (Other) Antennas. Are you sure you want to continue?
PNO_N0_22(802.11b/g/n), PNO_N0_24(802.11b/g/n)"
PNO_N0_22 et PNO_N0_24 are my access points's name.
Below you can see that internal antenna is well detected on some AP but not for all.
Does anyone have any other suggestions or overcome the same issue?
Thank you

Wow i just solved it ...
For information I created a template for my Lightweighted AP and there is a field to force antenna type.
I choosed my Antenna-1040-2,4Ghz and everything is now working

Antenna Selection for High ceiling (Warehouse)

i read nearly 500 topic on antenna selection for high ceiling and industrial warehouse environments (~10m ceiling)
Question1 : both ant2544v4 and Ant2524 has ~60 degrees Elevation plane 3 dB beamwidth does it mean this Omni antenna could be mounted on 10m height without coverage issue ?
Question2:suppose installing plenty of 2702 with Ant2524 or Ant2544V4 in close adjacency , does CleanAir2 helps to avoid interference ?
Question3:if i want avoid directional antennas to cover aisles using dipoles is the last solution ? (if omni antenna cant afford enough elevation due to its nature )
my warehouse area is something like this : http://www.pathguide.com/Images/Content/warehouse%20aisle.jpg
thanks

As I can see this location presents challenging RF conditions: high attenuations, reflections, multipath, etc. The fact that you need to implement Voice WLAN too, introduces more difficulties.
You have to conduct a wireless site survey. I don't know how much experience do you have with this activity or if you have the equipment and site survey tools required, but it has to be done.
In the worst case scenario you have to grab at least one or two APs from the model that you intend to install, set them up in stand alone mode with some test SSIDs and install them in the warehouse in different locations. Than you walk arround and try to measure the signal quality and attenuations. You cand use some free or trial site survey applications that can be found on the Internet.
You have to find out what protocol (802.11 a/b/g/n) the barcode scanners are using and what TX power are they capable of. You should set up your APs accordingly (the AP TX power should not exceed the client power, preferably it should be about half in order to benefit of CHD). The same has to be done for the Voice clients. The survey has to be done separately for each 802.11 protocol. I recommend taht you do some futher reading on the subject.
As for the antenna type, Cisco recommends directional antennas in high ceiling environments. However, I have installed 2702e APs with standard omni antennas in warehouses and they did the job very well. The difference in my case was that I installed the APs on cable channels at ~6-7 meters, not directly on the ceiling. Maybe you can find some other mounting possibilities besides the ceiling if you want to stick to omni antennas.
The co-channel interference between adjacent APs is avoided usualy by DCA and TPC not as much by CleanAir. However in 2.4 GHz there could be some interferences.
As a conclution you have to use some real APs in order to estimate, with at least a minimal accuracy, the position and number of required APs for the deployment. Do not forget about the cabling requirements for the APs, distances to the closest switch, electrical power etc.

Diversity - Distance between Antennas

Considering both antennas are similar-type and gain the two imp criterias i read in achiveing Diversity is
1. Antennas should be placed close enough to each other so that the RF coverage area is nearly identical.
2. The receiving antennas are spaced sufficiently apart to achieve independence (no coupling) between the received signals.
So the distance between both the antenna would be important.
In a cisco doc,
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml
For 2.4GHz wavelength = 12.5cm and for 5GHz wavelength = 6cm.
Hence for 2.4GHz wavelength,
Dist bet diversity Ant = 12.5cms Or 25cms or 37.5cms or 50cms
now from below POST:
http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=WLAN%20Radio%20Standards&topicID=.ee6e8c2&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cc18267
The spacing can be in multiples but is best in multiples of odd numbers. 1x or 3x. This allows for the phase to be always 100% out for the opposing antennae. 2x could cause phase shift overlay and could result in both antennae receiving the same phase shift differentiation.
Is this true? then my choise would narrow down to "Dist bet diversity Ant=12.5cms or 37.5cms'
But from below POST iam confused regarding point 1 and 2 (I have put them pointwise just for reference)
http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=WLAN%20Radio%20Standards&topicID=.ee6e8c2&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cc0332d
1. Never should you have the antennas exactly one wavelength away from each other. For the frequency of 2400, one wavelength is 4.92"... so any distance that is not a multiple of 4.92 and no more than a multiple of 4 is recommended.
2. You should use 1/2 wavelength distances and to be safe no more than multiple of 3.
My Questions are
1. Should the distance between my Antennas for diversity be any len more than 12.5 cms and less than 25cms or more than 37.5cms and less than 50cms?
2. Is it that the distance between my Antennas for diversity should not be exactly equal to the multiple of wavelengths? (12.5cms, 25cms, 37.5cms, 50cms)
3. Is it that i have to use only odd wavelengths multiples? (12.5cms, 37.5cms) and should not use even multiples?
4. The use 1/2 wavelength distances between the antennas is diversity. Is it ok? or is the minimum 1 wavelength as specfied in the cisco doc.
Also from the below POST iam confused regarding the MAX distance:
http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=WLAN%20Radio%20Standards&topicID=.ee6e8c2&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1dd7905b
"Distance beyond 1-2 wavelengths is not critical. Since the antennas are not transmitting and/or receiving at the same time,there is no real chance of overloading the other antenna or radio front-end. "
There's not really a "max distance" as far as diversity is concerned. By placing the antennas some distance apart (the minimum, I believe, is ~one wavelength), you optimize the chance that a signal that is null (or interfered with) on one side, isn't on the other.
my question is
5. Is there a max distance between the antennas in diversity (like we read 4xwavelength) or there is no max distance? then wont there evolve a different RF coverage area for both the Antennas?
Another important question
> If my wireless card supports 5GHZ and 2.4GHZ and hence my antennas would be dual band. Then to achive antenna Diversity, what would be the distance between the two antennas? The minimum distance should be 1 wavelength, so For 2.4GHz wavelength = 12.5cm and for 5GHz wavelength = 6cm.
For a dual band antenna? how much should it be? Whats the min and max.
someone please can help me solve the huge confusion in my mind :)

First, let me say that this is certainly a well-done post, good job of back-tracking the links and expressing your questions.
The next thing is that there are more than a few nuances when dealing with RF and signal transmission and propagation, so to cover a specific topic fully would frequently cover more space than provided.
With all that dancing out of the way ;-), I'll take a shot at answering your questions...
"Is there a max distance ... ?"
Well, no, not really ... but there is a max *effective* distance and a fairly specific point of diminishing returns (as mentioned in the linked posts).
The design and implementation goal is to create a sort of "binocular view" with the antennas, such that the chance of a "null" is reduced, such that the signal / pattern developed from the diverse pair of antennas will create at least one clean and clear (reduced multipath, reduced nulls, possibly better line of sight)signal to (ideally) every client in the coverage area.
Even though only one antenna is active at any given time, having any conductor within the radiated field will distort the transmission envelope, either positively (in the case of a Yagi) or negatively (in the case of a grounded conductor, like a sprinkler head).
The amount of the distortion, and the shape of the distortion are functions of the size and shape of the parasitic element. The effect is so variable that it is one of the foundations for the contention that a comprehensive site survey is not really an option, it's mandatory; it's truely the only way to see what adaptations are necessary to make the "rules of thumb" function in the specific location.
Regarding antennas handling multiple bands:
The antennas (in this case) are close to resonant multiples. The differences are such that the logical / electrical length can be adjusted by adding inductive or capacitive loads at the transmitter or feed point.
Even though the physical shape of the antennas may be different from model to model, the electrical load characteristics for a given band / antenna remain similar, so electronically compensating to make an antenna primarily designed for 2.4GHz function well for 5.6GHz is not especially difficult. Going from the longer wavelength to the shorter is more effective and easier to design than trying to go the other way.
For example, a quarter-wave 2.4GHz antenna is easily compensated to create a good half wave (or loaded 5/8) 5.6GHz antenna.
So, (finally) to provide the proper spacing for a diverse pair of multi-band antennas, figure for the longer wavelength (2.4GHz in this case) and the (roughly double) distance is likely to be acceptable for the higher wavelength. The spacing doesn't have to be exact; personally, I used to shoot for ~18" (variable with the mounting location and antenna type)and I always had pretty good luck, according to the follow-up survey.
Because of the jillions of possible variables, you can't just calculate and hang the antennas and be done ... a survey should be done to verify the installations and to make educated adjustments that will optimize the system for that specific location and environment.
The initial calculations are ideal guidelines, then you make adjustments to cover things like metal wall studs, sprinkler heads, the boss' favorite "wall o' vines" ... you will rarely get a perfect environment, adjustments are almost always required.
It's late and I'm starting to babble ... ponder the above and let us know if it helped any. There are a great bunch of experienced folks here, and I think this will be the start of a great discussion.
Good Luck
Scott

Antenna type on an AP

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