How to use BSNL broadband landline modem when there is power off..?

[rsk11584]

if you have to run only modem from UPS, better option is to take out 12V DC from battery terminals, and keep the UPS off. it will run Modem for ~10 Hours. as modem needs 12V@0.7A and UPS battery is 7AH. no need to step up from 12V DC to 220V AC and then step down 220V AC to 12V DC again, power is wasted in both operations.

another option is using small 12V battery with small charger, setup may cost <Rs500/- and backup time will be 2-4Hours depending on AH capacity (naturally battery cost will also depend on AH capacity)

Even thought the battery when directly connected will provide a backup of 2-4 hours to the modem, what about the backup for laptop??????????

Depending on the company and batterys health the back up can be anything. SO better use a UPS, to directly connect to laptop and modem both, so that when laptop battery begins to run out of juice the UPS can juice it up. Also do check before buying UPS, because some companies make their UPS as such that if there is no good amount of power drawing from it it will shutdown, I had one in my friends home, whenever he ran only Modem in his UPS it used to shut down automatically but when he connected PC n modem both to UPS it worked fine for the 20 mins or so. He told since the Modem draws very less power the UPS thinks there is no device drawing power from it and autoshuts down, thinking UPS eh

 

[deepak2010]

Buy a 12V Battery (SUNCA) and Compatible Charger for it. Battery will cost you around Rs.200. Configure it and It will give u enough backup for your modem.

 

[gagan007]

I agree with deepak...being a techie you should not be afraid of doing experiments...moreover it does not affect any instrument/gadget, it is the best and cheap option. I have made many small scientific projects during my school days using such setup...hardly broken anything...