[AusNOG] Question about hardware spec for a DC

[Tony de Francesco]

Alex,

Thanks. I think some of the other guys make some very good points also.

The dual power feed is not really a guarantee of the piece of kit
withstanding an internal failure. It is more about taking advantage of
dual power supplies from the DC operator (if dual power supplies exist).

In the US, where dual power feeds exist, it is common for all "A" (or
primary) power cords to be connected to the "A" supply. This means that
should a power failure of the "A" feed occur then theoretically all dual
corded equipment should automatically transfer over to the "B" supply.

In Australia it is not so clear. We see many DC's where 50% of equipment
has the "A" power cord connected to the "A" supply and the other 50% of
"A" cords connected to the "B" supply. The thinking is that the electrical
reticulation systems will be loaded 50/50.

Both strategies have their pros and cons, although the strategy commonly
used in Australia can have the disadvantage of having both "A" and "B"
power feeds being loaded at 60% (or more) each, which means that if one
power supply fails, then the remaining power supply has to carry 120% of
the rated capacity - which is not going to work for very long.


Kind Regards

Tony de Francesco

-----Original Message-----
From: Alex Samad - Yieldbroker [mailto:Alex.Samad at yieldbroker.com]
Sent: Thursday, 24 April 2014 11:08 AM
To: Tony de Francesco; ausnog at lists.ausnog.net
Subject: RE: [AusNOG] Question about hardware spec for a DC

Hi

That looks interesting.

My question was more around what NOG people would expect for equipment
that was destined for the DC.
For me, I would expect a dual power supply option

Alex

> -----Original Message-----
> From: Tony de Francesco [mailto:tonyd at pue.com.au]
> Sent: Thursday, 24 April 2014 11:02 AM
> To: Alex Samad - Yieldbroker; ausnog at lists.ausnog.net
> Subject: RE: [AusNOG] Question about hardware spec for a DC
>
> Alex,
>
> If you happen to end up with a piece of kit that is single corded only
> you can buy aftermarket dual cord interface kits that have an internal
> Auto Transfer Switch.
>
> I saw some very cool stuff recently from Zonit
> (http://www.zonit.com/micro-ats/)
>
>
> Kind Regards
>
> Tony de Francesco
>
>
> -----Original Message-----
> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of
> Alex Samad - Yieldbroker
> Sent: Thursday, 24 April 2014 10:47 AM
> To: ausnog at lists.ausnog.net
> Subject: [AusNOG] Question about hardware spec for a DC
>
> A question for the list.
>
> When you buy equipment for a DC, would you expect it to come with dual
> power supplies, either as an option or as a standard?
>
>
> Alex
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