Exin CDCS Exam Dumps

ANSI/TIA-942 defines ratings across four areas:

Architectural

Electrical

Mechanical

Telecommunications (network cabling + architecture)

A data center cannot be considered Rated-3 unless all four areas meet the concurrent maintainability criteria. For telecom/networking, this means dual redundant backbone cabling, proper pathways, and separate routes to ensure no single point of failure.

A and B are incorrect because they limit scope to electrical/mechanical or cabling only.

C is incomplete: administration (ANSI/TIA-606) is part of compliance but architecture redundancy is mandatory.

ANSI/TIA-942 defines that the lowest rating across all four categories determines the overall facility rating. A facility cannot claim a higher overall level unless all subsystems meet or exceed that level.

In this case:

Mechanical = Rated-3

Electrical = Rated-4

Telecommunications = Rated-2

Since telecommunications only meets Rated-2, the overall facility is Rated-2, regardless of higher scores elsewhere.

This ensures that weak areas (like cabling) are not ignored, because they can compromise overall availability.

The minimum requirement for power feeds to a Rated-3 data center according to ANSI/TIA-942 is to have two independent power feeds, which can come from two different substations provided by the same power company. This ensures redundancy and concurrent maintainability, as each feed can support the load independently during maintenance or failure of the other.

Detailed Explanation:

The separation by two substations ensures resilience in case of a localized outage or substation maintenance, aligning with Rated-3 requirements for uninterrupted operation. ANSI/TIA-942 permits these feeds from a single utility provider as long as they are supplied from distinct substations.

EPI Data Center Specialist Reference:

EPI underscores the importance of dual power feeds from separate substations for Rated-3 facilities, highlighting that the ability to draw from different substations aligns with redundancy requirements for high availability.

In seismic-prone areas, cables should be tightly secured to racks and cable trays to minimize movement during seismic activity. Properly securing the cables prevents them from being damaged due to excessive motion, which could lead to outages or damage to connected equipment.

Detailed Explanation:

Loose cables can be vulnerable to shaking or sudden jolts during an earthquake, increasing the risk of disconnection or damage. By tightly organizing and securing cables, you ensure they remain in place, even during significant movement, thereby maintaining connection integrity and reducing the risk of physical damage.

EPI Data Center Specialist Reference:

EPI training includes considerations for data centers in seismic zones, advising that cables be firmly anchored to support structures to reduce movement and mitigate potential damage during seismic events.

Attenuation is the logarithmic ratio between input and output signals. For power, we use 10 log; for voltage or current, 20 log. Since EMF shielding is measured as field strength (V/m or A/m), power relationship is proportional to the square of field. Thus the correct attenuation calculation for shielding effectiveness is:

where:

M = maximum permissible field strength

R = measured field strength after shielding

This ensures the shield reduces field intensity to below allowable limits.