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 Although the P-class blade enclosures are the older outdated blade enclosures that are very cumbersome to install and manage the newer C-class blade enclosures can also be ordered as "carrier grade" systems with AC or DC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: [email protected] [mailto:[email protected]] On Behalf Of Armantrout, Fred Sent: Friday, December 21, 2007 10:27 AM To: [email protected] 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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