I read this story somewhere.The AC adapter ( 9V AC 1A ) of the BSNL supplied modem packed and the user wanted a replacement from BSNL. "No stock.Please come after three months" was the reply.The user could not get a 9V AC 1A adapter in the local market. Finally he got it repaired by a technical guy and happily went online.This is only for information. I use a BSNL supplied modem since the inception of Dataone service and have had no problems so far.If you have a good UPS which powers all yours electronics, I presume you should have no problems.