10-26-2007 12:42 PM - edited 07-03-2021 02:50 PM
If I attach an external antenna to a 1020 AP, such as the ANT5959 and configure this in the WLC does this disable the internal antenna, or act as a second antenna?
10-27-2007 05:02 PM
Hi Mark,
Although this is not clearly defined in any doc that I have seen, this is an either/or configuration. So you can use Internal Antenna/Antennas or External Antenna/Antennas but not both at the same time. This doc explains this somewhat;
http://www.cisco.com/en/US/docs/wireless/controller/3.2/configuration/guide/c32lwap.html#wp1104960
Hope this helps!
Rob
10-30-2007 05:47 AM
Also, bear in mind that you must use both connectors to get diversity back. Use of a single antenna lead does not result in antenna diversity. The AP 1020 supports diversity on the integrated patch antennae but by a much argued method. In short, the 2 internal antennae are mounted opposite directions and when the AP chooses which side it hears the signal from, it broadcasts the reply from the same side. This can be a problem when the client is moving or in extreme, and I say extreme, cases of multipath.
11-26-2007 09:59 AM
I'm now in the implementation phase and am a little confused.
I have configured the APs to use the external antenna, but it needs the gain in 0.5 dBm units. The ANT5959 docs state I peak gain is 2 dBi. How to I work out the value to enter in this field?
11-26-2007 10:05 AM
Double the number when filling in this field. ie 2dBi = 4 in the field.
11-26-2007 01:30 PM
That was my initial thought, but the difference in units still concerns me i.e.
dBi == The dB power relative to an isotropic source
dBm == decibels with respect to one milliwatt
I have tried to find more information in the Cisco docs, but without success.
11-26-2007 03:43 PM
probably wont. dB is the functionality of adding together different units that otherwise wouldn't be addable. (That's a real word in the southeastern US).
The fact that it concerns you shows you're thinking.
google or wikipedia decibel for a better understanding but dennis is correct.
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