DC UPS and Transfer Times Following on from Klara V’s article on UPS Transfer Times I thought I’d expand on this with regard to DC UPS Systems. A DC UPS system works very much in the way that an online UPS works up to a point. That is, it takes incoming AC and converts this […]
In telecommunication systems it is common to have a supply voltage of -48Vdc. What this means is that the positive terminal is grounded. But why 48V and why ground the positive end? Surely it would be more intuitive to ground the negative end? I’ll answer these questions in turn. Why 48Vdc? This is a trade […]
The iPower is an ideal solution to enable the continuity of telephony services in the event of a power outage for GPON ONT devices.