[j-nsp] EX4550 DC Power Supply

[Sean Mentzer]

No, those separate inputs are actually connected together in the power
supply.  There is a description of that on the hardware documentation for
the QFX3600 (which uses the same DC power supply as the EX4550):
http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/dc-power-supply-qfx3500.html

"*Caution: *The V+ terminals are shunted internally together, as are the V-
terminals. The same polarity terminal can be wired together from the same
source to provide an additional current path in a higher power chassis. Do
not connect the terminals to different sources."

For A/B use, install two separate power supplies.


On Sun, May 26, 2013 at 10:08 PM, Jed Laundry <jlaundry at jlaundry.com> wrote:

> Hello,
>
> I see that the DC power supplies for the EX4550 have two inputs - is this
> for A/B systems (what I would expect), or are they wired together in
> parallel?
>
> If A/B, what's the wiring configuration? A1,3 B2,4?
>
> Thanks,
> Jed.
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