Packet Switched Network (PSN)
A digital data transmission network that uses packet switching technology.
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A group of binary digits switched as a whole – for instance, a file transfer over a packet switched network would require many steps. These steps are: 1) the data file would be broken down into smaller “packets” of information 2) each packet of information is assigned a code that enables it to be sent to the correct location and, once at that location, for the network to reassemble the packets of information into their original form.
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Leave a Comment (0) →Oversubscription
In a communications system in which multiple users share a common resource, oversubscription refers to the ratio of the allocated bandwidth per user to the guaranteed bandwidth per user. Underlying the oversubscription model is the fact that statistically few users will attempt to utilize their allocated bandwidth simultaneously. Calculation and management of oversubscription ratios is common in the CATV industry, Telecommunications, and Local Area Networking.
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Leave a Comment (0) →Overcooling
A situation where air is cooled below optimum levels. Typically used in reference to rack inlet temperatures.
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Leave a Comment (0) →OpEx
Operating Expense, the ongoing expenses related to operating the data center.
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Leave a Comment (0) →Nominal Cooling Capacity
The total cooling capacity of air conditioning equipment, includes both latent cooling and sensible cooling capacities.
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Leave a Comment (0) →Network Switch
A network switch or switching hub is a computer networking device that connects network segments or network devices. The term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model. Switches that additionally process data at the network layer (layer 3) and above are often referred to as layer-3 switches or multilayer switches.
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Leave a Comment (0) →Network Equipment-Building Systems (NEBS)
Design guidelines applied to telecommunications equipment.
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Leave a Comment (0) →NAS
Network Attached Storage
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Leave a Comment (0) →N+1
Need plus one, a redundancy concept where capacity is configured to include used capacity plus one additional device to enable continued operations with the failure of one system in the configuration.
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Leave a Comment (0) →MTTR
Mean Time to Repair
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Leave a Comment (0) →MTDC
Multi Tenant Data Center
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Leave a Comment (0) →MoR
Middle of Row
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Leave a Comment (0) →Minimum Point of Presence/Engry (MPoP)
Either the closest practicable point to where the carrier facilities cross the property line or the closest practicable point to where the cabling enters a multi unit building or buildings.
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Leave a Comment (0) →Minimum Efficiency Reporting Value (Merv)
For air filtration measured in particulate size.
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Leave a Comment (0) →Main Distribution Area (MDA)
The space in a data center where the main cross-connect is located as defined by TIA 942 specifications.
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Leave a Comment (0) →Load
The demand placed on a system, typically used to describe the electrical demand on the electrical supply system or the cooling demand on the cooling system. Units are power such as kW, BTU/hr, Tons, etc.
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Leave a Comment (0) →Liquid Cooling
A general term used to refer to cooling technology that uses a liquid to evacuate heat. In data centers, the two prevalent forms of heat evacuation are liquid (chilled water) and refrigerant (DX).
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Leave a Comment (0) →Latent Cooling Capacity
Cooling capacity related to wet bulb temperature and objects that produce condensation.
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The process of condensing water out of air, then evaporating the water later. Energy is given up by the water during condensation. If the water is then later evaporated (such as from a drip tray), the amount of energy used to evaporate the water is the same as the amount of energy given up by the water vapor to the cooling equipment when it was condensed. Cooling is occurring later in time, hence the name “latent cooling”. In a system where condensed water is pumped or drained away, the cooling that may occur from evaporation does not cool the environment where the condensation took place so the cooling capacity spent condensing the water vapor is wasted energy.
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