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Aggregation System

A uniquely identifiable entity comprising, among other things, an arbitrary grouping of one or more ports for the purpose of aggregation. An instance of an aggregated link always occurs between exactly two aggregation systems. A physical device may comprise a single aggregation system or more than one aggregation system (see IEEE 802.3, Clause 43)

Aggregation Port

An instance of a MAC-physical layer entity within an aggregation system (see IEEE 802.3, Clause 43)

Aggregation Link

An instance of a MAC-physical layer-medium physical layer-MAC entity between a pair of aggregation systems (see IEEE 802.3, Clause 43)

Acoustics

Generally, a measure of the noise level in an environment or from a sound source. For a point in an environment, the quantity is sound pressure level in decibels (dB). For a sound source, the quantity is sound power level in either decibels (dB) or bels (B). Either of these quantities may be stated in terms of individual frequency bands or as an overall A-weighted value. Sound output typically is quantified by sound pressure (dBA) or sound power (dB).

ACH

Air changes per hour. Typically referring to outdoor air changes per hour

ACGIH

American Conference of Governmental Industrial Hygienists

10BASE-X

IEEE 802.3 physical coding sublayer for 10 GB/s operation over XAUI and four lane PMDs (see IEEE 802.3, Clause 48)

10-BASE-R

IEEE 802.3 physical coding sublayer for serial 10 GB/s operation (see IEEE 802.3, Clause 49)

10BASE-CX4

IEEE 802.3 physical layer specification for 10 GB/s using 10GBASE-X encoding over four lanes over shielded balanced copper cabling (see IEEE 802.3, Clause 54)

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