didn't someone tell me that telco equipment had 40vdc racks once?

[Phil Thayer]

Your right on the money as far as the HP server go.  Although the
P-class blade enclosures are the older outdated blade enclosures that
are very cumbersome to install and manage the newer C-class blade
enclosures can also be ordered as "carrier grade" systems with AC or DC
power options.  There is also an HP Integrity "carrier grade" system
(runs Linux, HP-UX, Windows or OpenVMS) and HP Intel Xeon based "carrier
grade" system (Linux and Windows) both of which use DC power.

http://www.hp.com/products1/servers/carrier_grade/products/bl460c-cg/ind
ex.html 
http://www.hp.com/products1/servers/carrier_grade/products/cx2620/index.
html
http://www.hp.com/products1/servers/carrier_grade/products/cc3310/index.
html

I have seen very few of these installed, mainly because the Telco's deal
directly with HP and not through a partner.

Phil

> -----Original Message-----
> From: kclug-bounces at kclug.org 
> [mailto:kclug-bounces at kclug.org] On Behalf Of Armantrout, Fred
> Sent: Friday, December 21, 2007 10:27 AM
> To: kclug at kclug.org
> Subject: RE: didn't someone tell me that telco equipment had 
> 40vdc racks once?
> 
> This summer while checking out possible new data centers, one our eval
> outings our team visited was a former telephone crosslink 
> site.  It was
> over in Shawnee.  That site HAD 48V DC and a significant DC bus system
> installed.  There was lots of shiny copper and an impressive 
> power / UPS
> room.  
> 
> On what could connect to it.  Looking at the options, I think some of
> the HP ProLiant systems have Telco versions that can be fed DC rather
> than standard AC power supplies.  One in particular, the HP P-class
> Blade servers has external power sources and they feed 48V DC into the
> chassis.  HP even has a rack power setup that can stack multiple blade
> chassis and tie it all to a 48V system or a common AC/DC 
> supply to stack
> them.
> 
> You DON'T want to drop a screwdriver across it or you WILL see stars.
> 
> Fred Armantrout
> Burns & McDonnell Engineering Co.
> 
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