hi govindaraj,diw and patrick,
i am sudheerbose from goa .
i also face this problum from before one month frequently in one site everyday. when there is no ups in our site at that time if main fail came site was down . after putting ups in site the problum again comes after 25 days once .
when i will get that alarm ( oven ossilator was broken) i just reconnect the power cable at the bts end .
if i do just power on/off also site will not restore.we are using 13 Mhz clock only .