nanog mailing list archives
Re: Want to move to all 208V for server racks
From: Kevin Stange <kevin () steadfast net>
Date: Thu, 02 Dec 2010 14:01:35 -0600
On 12/02/2010 09:58 AM, Jay Nakamura wrote:
I really want to move all newly installed internal and customer racks over to all 208v power instead of 120v. As far as I can remember, I can't remember any server/switch/router or any other equipment that didn't run on 208v AC. (Other than you may need a different cable) Anyone have any experience where some oddball equipment that couldn't do 208v and regret going 208v? We won't have any TDM or SONET equipment, all Ethernet switches, routers and servers. I have control over internal equipment but sometimes customers surprises you.
We run our datacenters with mostly 208V power because it lets us get more power-hungry equipment in a single cabinet. With the exception of very old servers, pretty much all standard power supplies are auto-sensing across the 110 - 240 range voltages and will work fine as long as you use an IEC C13 to C14 cable. Most of the older power supplies have a manual switch you must switch if you don't want to blow the power supply. All network equipment that uses a standard IEC C13 cable that I've seen is auto-sensing, but you should certainly check the documentation. I've seen recent and old Dell, Cisco, HP and Netgear switches that work fine with 208V. For anything with a AC adapter, we check the transformers and find most of those are auto-sensing too. The trick is either the customer has to know in advance and pick up an AC adapter with a C14 connector (which is fairly rare since they all use different polarization, voltage and connector sizes), or to stock some NEMA 5-15 to C14 converters. For a Cisco ASA, which we see a lot, you need a C5 cable. The standard cable is a C5 to NEMA 5-15. We picked up some adapters from C5 to C14 standard pretty cheap to make these work. It is very good practice to check EVERYTHING before plugging it in because if it can't handle 208V, you will hear a pop and it will be dead before you can realize your error. Pretty much anything that uses power has a label on it somewhere describing its supported input voltage. -- Kevin Stange Chief Technology Officer Steadfast Networks http://steadfast.net Phone: 312-602-2689 ext. 203 | Fax: 312-602-2688 | Cell: 312-320-5867
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Current thread:
- Re: Want to move to all 208V for server racks, (continued)
- Re: Want to move to all 208V for server racks Seth Mattinen (Dec 02)
- Re: Want to move to all 208V for server racks William Herrin (Dec 02)
- Re: Want to move to all 208V for server racks Owen DeLong (Dec 02)
- Re: Want to move to all 208V for server racks Lamar Owen (Dec 02)
- Re: Want to move to all 208V for server racks Jeremy Bresley (Dec 02)
- RE: Want to move to all 208V for server racks Alex Rubenstein (Dec 02)
- Re: Want to move to all 208V for server racks Chuck Anderson (Dec 02)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 03)
- RE: Want to move to all 208V for server racks Alex Rubenstein (Dec 03)
- Re: Want to move to all 208V for server racks Lamar Owen (Dec 04)
- Re: Want to move to all 208V for server racks Chuck Anderson (Dec 02)
- Re: Want to move to all 208V for server racks Kevin Stange (Dec 02)
- Re: Want to move to all 208V for server racks Christopher Phillips (Dec 02)
- Re: Want to move to all 208V for server racks William Pitcock (Dec 02)
- Re: Want to move to all 208V for server racks Gary Buhrmaster (Dec 03)
- RE: Want to move to all 208V for server racks Alex Rubenstein (Dec 03)
- RE: Want to move to all 208V for server racks David Hubbard (Dec 02)
- Re: Want to move to all 208V for server racks Jay Nakamura (Dec 02)
- Re: Want to move to all 208V for server racks Mark Kent (Dec 02)
- Re: Want to move to all 208V for server racks Ingo Flaschberger (Dec 02)
- Re: Want to move to all 208V for server racks Seth Mattinen (Dec 02)
- RE: Want to move to all 208V for server racks Alex Rubenstein (Dec 02)