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N-Tier Architecture:
A true n-tiered web architecture separates user interface, logic, and data into four clearly delineated logical layers: physical UI rendering, logical UI definition, business logic, and data access. An n-tiered architecture provides customers with a broad variety of deployment options with UI, logic, and data being distributed amongst multiple physical tiers.

Network Attached Storage (NAS):
File-oriented storage networking implementation, deployed in the form of customized storage appliances that are connected to the IP network. Due to the file abstraction layer, NAS offers both storage and data sharing services across multiple platforms and protocols.

PHY:
Physical layer device. The Ethernet PHY at Layer 1 of the OSI model defines the electrical and optical signaling, line states, clocking guidelines, data encoding, and circuitry needed for data transmission and reception. Contained within the PHY are several sublayers that perform these functions including the physical coding sublayer (PCS) and the optical transceiver or physical media dependent (PMD) sublayer for fiber media. The Ethernet PHY connects the media to the MAC (Layer 2).

PAR:
Project authorization request. The document drafted by the HSSG requesting that a standards effort be started.

PCS:
Physical coding sublayer.

PMD:
Physical media dependent sublayer, usually an optical transceiver.

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