Equipment Room (ER)
An environmentally controlled centralized space for telecommunications equipment that usually houses Distributor B or Distributor C.
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Leave a Comment (0) →Equipment Distribution Area (EDA)
The computer room space occupied by equipment racks or cabinets [TIA 942]
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Leave a Comment (0) →Entrance Room
(do not use acronym) – use Entrance Facility to avoid confusion with Equipment Room
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Leave a Comment (0) →Entrance Point
The point of emergence for telecommunications cabling through an exterior wall, a floor, or from a conduit.
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Leave a Comment (0) →Entrance Facility (EF)
An entrance to a building for both public and private network service cables (including wireless) including the entrance point of the building and continuing to the entrance room or space. (569)
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Leave a Comment (0) →Electrostatic Discharge (ESD)
More commonly ‘static discharge’.
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Leave a Comment (0) →Economization
A way of utilizing the local environment around the data center to aid in cooling of the IT load by natural means rather than use more energy. There are two common types of economization, Airside Economization and Waterside Economization; sometimes referred to as LINK. Economization is a great benefit to those who can take advantage of it due to the large energy saving opportunity.
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Leave a Comment (0) →Duct Bank
An arrangement of conduits, used to transport electrical, telecommunications cabling or data cabling inside or outside of a data center facility arranged in an array.
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Leave a Comment (0) →Dry-Bulb Temperature
The temperature of the air measured using a dry-bulb thermometer such that evaporative cooling has no effect. Typically taken in conjunction with a wet-bulb reading which does include the evaporative cooling effect in order to determine relative humidity.
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Leave a Comment (0) →Dry Cooler
A liquid-to-air heat exchanger that is a radiator over which air is blown via fans. Typically used as the heat rejection device for water or glycol cooled condensers, may also be used as the heat rejection device for liquid cooled coils in an AHU under proper environmental conditions.
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Leave a Comment (0) →Distribution Frame
A structure with terminations for connecting the cabling of a facility in such a manner that interconnection or cross-connections may be readily made.
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Leave a Comment (0) →Direct Current (DC)
A non-time varying method of delivering power. While slightly more efficient then AC if utilized between the DC portion of the UPS and the power supplies in IT equipment, it has not won wide acceptance in modern data centers.
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Leave a Comment (0) →Dewpoint
The temperature at which air reaches water vapor saturation. Dewpoint is constant for a specific amount of water in a specific amount of air while relative humidity varies with temperature. The latest ASHRAE spec for data center environmental conditions includes an upper limit for humidity based on dewpoint.
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Leave a Comment (0) →Delta T
The difference in temperature across a device. Examples include the temperature difference between the inlet and outlet of piece of IT equipment or between the inlet and outlet of a cooling unit (CRAC or CRAH). Delta T, airflow and thermal dissipation are related: thermal dissipation = airflow x delta T x specific heat of air.
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Leave a Comment (0) →DCRS
Data Center Ready Solution
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Leave a Comment (0) →DCIM
Data Center Infrastructure Management. as the integration of information technology(IT) and facility management disciplines to centralize monitoring, management and intelligent capacity planning of a data center’۪s critical systems. Achieved through the implementation of specialized software, hardware and sensors, DCIM will enable a common, real-time monitoring and management platform for all interdependent systems across IT and facility infrastructures.
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Leave a Comment (0) →Data Center infrastructure Efficiency (DCiE)
A metric developed by the Green Grid, data center infrastructure efficiency is an efficiency measure that is calculated by dividing the IT equipment power consumption by the power consumption of the entire data center. This measure is the inverse of PUE.
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Leave a Comment (0) →Cut Out
An open area in a raised floor that allows airflow or cable feeds.
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Leave a Comment (0) →Current Transformer (CT)
A device used to transform electrical current from one level to another with a specific ratio. For example, a 5000:5 current transformer transforms current on the primary side to current on the secondary side with a ratio of 1000:1. CTs are typically used to transform large currents to much smaller currents so that standard metering equipment can be used on a variety of circuits by measuring the secondary current rather than the large primary current.
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Leave a Comment (0) →Cubic Feet per Minute (CFM)
A unit of flow rate, commonly used to specify airflow.
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