Well, first, you need to learn the basic difference in layman's terms:
INVERTER vs UPS
While both provide backup power during mains outage, with the UPS the switch is instantaneous whereas with the Inverter there is a gap of a second or two. This gap is OK for household gadgets such as lights, fans, fridge, etc. but not OK for computers.
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Ok, here's the feedback: went to Bahadurabad and picked up a (rather big and ugly looking) multivoltage adapter rated at 1 A (1000mA) for a mammoth Rs. 230, set it at 9V and connected it to the Shiro modem. The original Shiro adapter was rated at 9V, 500 mA.
So far, working fine. Seems like you smart folks were right. Thanks for the help.
On a seperate note, I have an older Zyxel 600 modem (from a prior Multinet connection). Is this modem better? Should I attempt to configure this one for PTCL ?
As long as it makes ur modem work, keep that ugliness under the table ;-)
Computers & networking devices are always prone to slightest of the nanoseconds in electricity outages. All electronic devices work in DC and if your devices are feeling jolts of loadsheddings, the issue might be that power adapter is not converting AC to DC fast enough. So, modem gets restarted. AS SIMPLE AS THAT!
[P.S.] Just to add to this valuable info UPS provides the pure sine wave AC but this is not in the case of Inverter so there are chances that Inverter might damage the complex electronic circuitry of computer. But nowadays, inverters are coming with constant sine wave AC, so you should know what inverter you are using.