06-24-2010 12:21 PM
Has anyone of you experience with the combination of an AP124 with the AP-ANT-16? I'm currently rolling out this combination in a hospital environment, and with both radios (g and a) set to equal TX-power levels for some testing I'm experiencing quite different signal levels (5GHz being 12 to 20 dBm weaker than 2.4GHz) for both radios standing 5 to 10 feet away from the AP. I know the 5GHz signal behaves different through walls etc., but in open space I have the experience with several types of AP's (65, 105) that signal levels at the distance described, and with equal TX-power are nearly the same.
The trigger for this question is that I'm having a stable connection at -72dBm/65Mbps with 2.4GHz, but -72dBm with 5GHz results in an unstable connection at 6Mbps. The SNR is always 20dB or better. Initially I disabled HT on the 2.4GHz, but for a fair comparison I enabled it on both radios (which are having equal configs now).
We tested this setup with different Intel 5100 and 5300 cards, and we also "re-verified" the signal levels with Airmagnet.
Any experience or suggestions are greatly appreciated.
06-29-2010 04:51 PM
I would check all the cables and make sure everything is correctly connected. Also, have you seen this on multiple APs or just one? Do you have any ANT-1Bs to test with and re-test the signal seen? Sorry if these are things you have already tried.
Sr. Techical Marketing Engineer
07-01-2010 05:18 AM
Today I was at another site, and had the chance to test with the the same AP (124) and a different antenna AP-ANT-14. In this case at max. TX-power the received signal strengths of both radios where equal.
By the way: what's the minimum signal strength you would recommend for a stable 802.11n connection (minimal speed > 60Mbps) @5GHz? The unstable connection at -72dBm/5GHz was the trigger for this topic.