Has anyone tried using multiple antennas for a single AP ? Why would you ask? For example, if a coverage area does not require high throughput requirements, however, coverage is critical, then more than 1 AP would still be needed. New solution - Use one AP, but split the antenna to multiple locations?
I was wondering what happens in overlapping areas. Would it be destructive for a AP/Client to see multipaths of the same signal from different antennas? Or constructive, if the system can use diversity to its advantage?
I agree. Splitting a diversity antenna wouldn't do very much, however, if a 802.11 network was connected to a distributed antenna system (DAS), where each antenna is seperate, but connected to the same AP, theoretically you can cover an entire floor with a single AP. I was wondering if anyone has done this yet, because why throw up 4 APs or more, when you can throw 1 up just so that you are covered. You can increase capacity by adding more APs, but the APs can be centralized, making installation and maintenance easier.
At 2.4 GHz, signal loss in cable is pretty severe. To buy cabling that would rduce the losses to acceptable limits (something like Andrew LDF4-50) would cost as much as another AP. Amplifiers for that freq range can also get pricey, depending on the gain (and noise figure).
Unless you use an "active splitter" (a multiport amplilfier), splitting the signal will reduce the signal levels by more than half (per split) because of the loss associated with the splitting device. You may have more antennas, but they're all putting out less than half of the signal thy used to ( the reception also suffers in the same way).
Another reason may be legalities. The (unlicensed) spectrum used by wireless devices (some of the 2.4G range, in this case) is restricted to certain maximum Effective Radiated Power (ERP) measured at the antenna(s). Exceeding the limit exposes you to potential Federal action (in the USA) - other countries regulate their spectrum differently.
The limit is imposed so that more people can use the spectrum. If you increase the coverage area by amplifying the signal (which would include an array of antennas) you are more likely to interfere (and be interfered with) with another party trying to use the same spectrum.
If you check, all of these systems are sold with specific part makeups or configurations: this antenna, with this cable, going to this AP. All have been tested for Federal compliance. If you replace the antenna with something bigger (more gain), or you use more efficient cabling (less loss = more power to the antenna), or insert an amp into the line, chances are you're out of Federal compliance.
I'm sure there are other reasons, these are the first two that came to mind.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
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 ...
I have created a Powershell script to automatically add a Wireless Guest User on Cisco WLCs. (tested on 2500 Series)
The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...