I have a 2811 router with a PWR-2811-DC power supply in it. I have a PWR-2811-AC power supply that I would like to install in place of the DC input supply, but there is a second internal electrical connector on the DC supply that is absent from the AC supply. Can I just leave this cable disconnected (4 pos cons both ends with one Red and one White wire between) with the AC supply installed?
Computers & Internet - Cisco - 2811 Router
Answers & Comments
No.
AC power is like a child's swing -- it goes from "neutral" to "positive" to "neutral" to "negative" to "neutral", and repeats.
DC power is like leaning into a strong wind -- as long as you keep leaning, you stay on your feet; stop leaning, and the force of the wind will blow you down.
So, you cannot substitute AC for DC power.
Let me type more slowly, so that you understand:
N o . Y o u c a n n o t s u b s t i t u t e A C f o r D C p o w e r
The device wants "plus-NN" volts; when you feed it "negative-NN" volts, even only 50% of the time, it will blow-up, real-good.