Basic Data Center Topology Here you can see the various "spaces" and cabling subsystems that comprise a basic data center topology. The architecture here is typical of that deployed for a large enterprise or an Internet data center that provides services such as web hosting. 
Example of basic data center topology
Distributed Data Center Topology Here is a data center design that may be used for larger data centers that have either large office and support areas or those in which the distances separating the two is significant. Multiple telecommunications rooms may also be used for data centers of this type. In addition, multiple entrance rooms may be required due to circuit distance restrictions. The additional entrance rooms may be connected to the MDA they support using optical fiber, twisted-pair or coaxial cables. 
Example of distributed data center topology with multiple entrance rooms
Reduced Data Center Topology Here is a smaller data center that would support a medium size enterprise. In this design, the main cross connect (MCC) and horizontal cross-connect (HCC) can be consolidated and be as small as a single cabinet or rack. As in a traditional premises structured cabling system, the Telecommunication Room for cabling to the support areas and the Equipment Room can also be consolidated into the MDA in this reduced data center topology. 
Example of reduced data center topology
Centralized Fiber Design Finally, here is a data center using a centralized fiber architecture. This architecture is similar to that supported in the TIA/EIA-568-B.1 standard for Commercial Building Telecommunications Cabling Systems and ISO 11801, the international equivalent. This architecture provides an alternative to the optical cross-connection in the HDA whereby no electronics are required in that space. In addition, there are significant cost reduction factors realized in a data center employing this architecture. These include: (1) a smaller, simpler HDA; (2) faster and easier installation and testing; (3) fewer idle ports; (4) centralized administration; and (5) simplified moves, adds and changes. 
Example of centralized fiber design
Next: Why Design Your Data Center for Compliance with TIA-942?
- Reproduced under written permission from Telecommunications Industry Association. For further information on how to obtain TIA standards please go to http://global.ihs.com or contact Global Engineering Documents at 1-800-854-7179 or 303-397-7956.
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