We have a solid 2-story concrete building built in the 60s with a nuclear bombshell. The hallways are narrow and low, lined with mostly tiny offices with solid ceiling tiles and at least 6 inch solid concrete walls.
Due to cabling difficulties, on the 2nd floor in a relatively small area incld. a conference room surrounded by hallways and offices on each side of the hallways, we had to mount three 1220B APs on the hallway wall near the ceiling. The antennas are just what comes with the APs -- dipole "rubber duck".
This setup works most of the time, with stationery users frenquently switching associations between the APs. On a couple machines they will disconnect a couple times a day or so and can be repaired most of the time. I also noticed these two machines are situated close to the window and can see a couple unsecured network with strong signals. I wonder if it's the occasional channel conflicts with the neighbor's wlan that causes this intermittent disconnection, or it's the complicated signaling problem inside our building. Since we only leave 3 APS in here at this point, there shouldn't be any channel problem between themselves.
Can someone advise me for antenna choice and replacement in this type of situations.
I am thinking about buying an good omni (for the one in the conference room) and two directionals covering the hallways. I am also considering replacing the B module with G, and get a WLC to manage the RF and channels and diagnostics.
Appreciate your advice.