Hi Eugene,
I'll take a stab at answering your questions.
> Should I test just one rack of a type on the turn table for RE?
> How many racks should be tested together for CE? Or just one?
I test the worst-case maximum configuration that can be mounted in a
single 19-inch rack. FCC would refer to this as a "composite system"
[47CFR15.31(k) in
http://www.gpo.gov/fdsys/pkg/CFR-2014-title47-vol1/pdf/CFR-2014-title47-vol1-sec15-31.pdf].
While FCC talks about composite systems having separate enclosures
connected by wire, I do not believe one needs to extend that to
everything in an IS shop (or everything in the world) that is connected
by wire. Hence, I stop at a more reasonable place of a single 19-inch
rack. Generally, a single rack would have a couple of servers, couple
of disk arrays, a couple of Ethernet and/or Fibre Channel switches, and
the rest of the rack filled with disk arrays.
> What standards are to be applicable for this situation? FCC?
> Bellcore GR-1089? Both? More?
Only FCC has the force of law, so this is the only one that is
mandatory. However, your e-mail indicates that you intend to sell to
telephone companies in USA, and some telephone company customers will
only buy products that are NEBS compliant (GR-1089). NEBS would be a
marketing requirement, not a regulatory requirement. Please note that
you can sell non-NEBS verified products to telephone companies (even
AT&T and Verizon) if they plan to use it in their IS shop away from
their telecommunications network control facilities, but you will be a
step ahead of the competition if you did go ahead and get NEBS for those
customers.
Be forewarned that you need to check on a lab's accreditation to confirm
they can test for NEBS, and some telephone companies also require the
Verizon accreditation for the test labs with Verizon's extra
requirements. Complying with NEBS will add cost to your products both
in the testing and in the design. Again, this is a marketing decision.
Ed Price adds an interesting discussion about treating the entire data
center as a single product. I don't think this is practical from from a
sales perspective because it would require doing on-site emissions
testing every time the data center changes (installs extra equipment).
Hope this helps.
Monrad Monsen
Disclaimer: Everything expressed in this e-mail are strictly my own
opinions and are not necessarily those of any employer I work for.
<http://www.oracle.com>
On 5/14/2015 1:42 AM, Ed Price wrote:
*I’m not an expert on this, but here’s a starter. Shouldn’t a data
center be within an RF shielded enclosure, with power and signal ports
bandwidth limited by filters and couplers? (Wouldn’t the data I/O be
fiberoptic?) A moderate enclosure should give you 80dB isolation from
the environment, and physical isolation will add to that. You could
consider the whole enclosure as one device.*
**
*For RE, standing just outside the enclosure, I doubt you could even
prove the data center internal systems were working. I’ll let others
add/correct this, but to me, a data center looks like a factory in a
box, with its own dedicated power feed (not shared by residential or
light industrial users) and can be treated as Part 18 ISM.*
**
*I don’t know what your client expects of you, but I think they should
be concerned with self-compatibility of the various subsystems
installed within that shielded volume. Will each rack of processors or
routers have its own UPS? What interactions will happen with multiple
UPS’s connected in parallel, and what will be the RE environment among
those racks? And if this equipment is all USA origin, what further
assurances of RS can the vendors provide?*
**
*/Ed Price
/**WB6WSN
**Chula Vista, CA USA**//*
**
*From:*Eugene Peyzner [mailto:epeyz...@sbcglobal.net]
*Sent:* Wednesday, May 13, 2015 8:56 PM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* [PSES] EMC and Data Center
Dear experts,
Could you please share your knowledge about a philosophical or logical
approach to EMC testing of a data center. To simplify my question
let’s talk about just EMI testing for USA.
Adata center contains computer systems and associated components, such
as telecommunications
<https://en.wikipedia.org/wiki/Telecommunication> and storage systems
<https://en.wikipedia.org/wiki/Computer_data_storage>, air
conditioning, fire suppression and various security devices. Servers
are mounted in19 inch rack
<https://en.wikipedia.org/wiki/19_inch_rack> cabinets. Some equipment
such as mainframe computers
<https://en.wikipedia.org/wiki/Mainframe_computer> and storage
<https://en.wikipedia.org/wiki/Computer_storage> devices are often as
big as the racks themselves, and are placed alongside them.
Should I test just one rack of a type on the turn table for RE? How
many racks should be tested together for CE? Or just one?
What standards are to be applicable for this situation? FCC? Bellcore
GR-1089? Both? More?
Thank you for your time and help.
Best regards,
Eugene
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