Entorno Global

When planning a new floor distributor system as part of a cabling system redesigning, a new floor distributor is usually placed in the data center or server room. This offers the advantage of using a quality infrastructure that generally already exists, including a raised floor, cooling system, USP, etc.

However, modern EMC-based designs advise against this if copper is used as a tertiary medium. The reason is that these modern EMC designs are based on a division of a building into different lightning protection zones.The overvoltage caused by an indirect stroke of lightning will be greatest in the outer area of the building (lightning protection zone 0) and will lead to an extremely high induction current.

To put it simply, metallic lines into a building from the outside will lead this high current into the building (lightning protection zone 1). Therefore, in a conventional telephone cabling system surge protection was provided at the entry of the building. However, there are other also zones in the building itself that would have a problem with the remaining residual current behind the surge protection element. Electronic components could be destroyed by this current. This resulted in the definition of other lightning protection zones, where the remaining current diminishes after each surge protection element in subsequent zones.

Data center server units have a very high protection requirement. These units are “packed” in lightning protection zone 2, so one must take care to minimize the lightning’s residual current within the data center. Designs in accor- dance with standards make provisions that each metallic conductor that is routed into or out of the data center be secured with a surge protection element.

If a floor distributor with a Twisted Pair concept is placed in a data center, each twisted pair line would therefore have to be protected with a surge protection element of sufficient quality(suppliers for this include Phoenix and other companies).This is very rarely put into practice in the data cabling system (in contrast to the power cabling system!), yet the risk does exist.

Recommendation

When setting up a high-availability data center, disregarding this generally established lightning protection zone concept (DIN EN 62305 / VDE 0185-305) would be negligent, and a floor distributor should therefore not be placed in the data center if at all possible.

4.

Appendix

References

Content from the following encyclopedias, studies, manuals and articles were used in this handbook or can be used as additional references:

BFE • Energy-efficient data centers through sensitization via transparent cost accounting (original German title: Stromeffiziente Rechenzentren durch Sensibilisierung über eine transparente Kostenrechnung)

BITKOM • Operationally reliable data centers (original German title: Betriebssichere Rechenzentren) • Compliance in IT Outsourcing Projects (original German title: Compliance in IT-Outsourcing-

Projekten)

• Energy efficiency in the Data Center (original German title: Energieeffizienz im Rechenzentrum)

• IT Security Compass (original German title: Kompass der IT-Sicherheitsstandards) • Liability Risk Matrix (original German title: Matrix der Haftungsrisiken)

• Planning Guide for Operationally Reliable Data Centers (original German title: Planungshilfe betriebssichere Rechenzentren)

• Certification of Information Security in the Enterprise (original German title: Zertifizierung von Informationssicherheit im Unternehmen)

CA • The Avoidable Cost of Downtime

COSO • Internal Monitoring of Financial Reporting – Manual for Smaller Corporations – Volume I Summary (original German title: Interne Überwachung der Finanzberichterstattung – Leitfaden für kleinere Aktiengesellschaften – Band I Zusammenfassung)

IT Governance Institute • Cobit 4.1

Symantec • IT Risk Management Report 2: Myths and Realities

UBA • Material Stock of Data Centers in Germany (original German title: Materialbestand der Rechenzentren in Deutschland)

• Future Market for Energy-Efficient Data Centers (original German title: Zukunftsmarkt Energieeffiziente Rechenzentren)

Information from suppliers like IBM, HP, CISCO, DELL, I.T.E.N.O.S., SonicWall and others was also added.

Standards

ANSI/TIA-942 Telecommunication Standard for Data Centers

ANSI/TIA-942-1, Data Center Coaxial Cabling Specification and Application Distances

ANSI/TIA-942-2 Telecommunication Standard for Data Centers Addendum 2 – Additional Guidelines for Data Centers ANSI/TIA-568-C.0 Generic Telecommunication Cabling for Customer Premises

ANSI/TIA-568-C.1 Commercial Building Telecommunication Cabling Standard

ANSI/TIA-568-C.2 Balanced Twisted-Pair Telecommunication Cabling and Components Standard ANSI/TIA-568-C.2 Optical Fiber Cabling and Components Standard

ANSI/TIA/EIA-606-A Administration Standard for Commercial Telecommunications Infrastructure ANSI/EIA/TIA-607-A Grounding and Bonding Requirements for Telecommunications

ANSI/TIA 569-B Commercial Building Standard for Telecommunications Pathways and Spaces EIA/TIA-568B.2-10

EN 50310 Application of equipotential bonding and earthing in buildings with information technology equipment. EN 50173-1 + EN 50173-1/A1 (2009 Information technology – Generic cabling systems – Part 1: General requirements EN 50173-2 + EN 50173-2/A1 Information technology – Generic cabling systems – Part 2: Office premises

EN 50173-5 + EN 50173-5/A1 Information technology – Generic cabling systems – Part 5: Data centers EN 50174-1 Information technology – Cabling installation – Part 1: Specification and quality assurance

EN 50174-2 Information technology – Cabling installation – Part 2: Installation planning and practices inside buildings EN 50346 +A1 +A2 Information technology – Cabling installation – Testing of installed cabling

IEEE 802.3an

ISO/IEC 11801 2nd Edition Amendment 1 (04/2008) + Amendment 2 (02/2010) Information technology – Generic cabling for customer premises

ISO/IEC 24764 Information technology – Generic cabling systems for data centers

ISO/IEC 14763-1 AMD 1 Information technology - Implementation and operation of customer premises cabling - Part 1: Administration; Amendment 1

ISO/IEC 14763-2 Information technology – Implementation and operation of customer premises cabling – Part 2: Planning and installation

ISO/IEC 14763-3 Information technology – Implementation and operation of customer premises cabling – Part 3: Testing of optical fibre cabling (ISO/IEC 14763-3:2006 + A1:2009)

ISO/IEC 18010 Information technology – Pathways and spaces for customer premises cabling

ISO/IEC 61935-1 Specification for the testing of balanced and coaxial information technology cabling – Part 1: Installed balanced cabling as specified in EN 50173 standards (IEC 61935-1:2009, modified); German version EN 61935-1:2009

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