How can I configure a Wireless Distribution System using Airport Admin Utility?

Dear all,
I had configured my WiFi base station in our office and there was no problem. Last week, suddenly we experienced that we were not getting radio connectivity in our Mac's. So I reset the WiFi base station again, but it won't work. I don't know what happened. I tried in different ways but still there is no signal. If anyone has any solutions, then please let me know.
Regards,
Masfiq
