On Thu, Oct 24, 2013 at 09:38:43AM -0700, Michael Loftis wrote: > I don't know anyone that assumes that the peak capability of a PSU > (especially in network gear) is it's actual consumtion, but thats just > me. I do agree I wish they'd publish at least approximate figures. > It can be a deciding factor in a lot of environments today. Keep in > mined 650W is high-line mode (~220/240VAC) - in 120V it's only going > to be around 325W.
This deserves clarification. The power usage in Watts for a given hardware configuration should be the same either way--it is just that in high-line mode 208/220/240V, you will draw less current in Amps, by about half for twice the voltage (ohms law approximately, with a Power Factor Correction thrown in), and because of this the power supply is designed so that you can consume up to 650W of power only if you use high-line mode, and if you max-out the supply in low-line 120V mode you will only be able to consume up to 325W. This implies that if you use low-line mode, you won't be able to install as many modules/optics/whatever-else-uses-power before hitting the max or losing power supply redundancy (being that both PSUs will be required to power everything). _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
