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In audio engineering and broadcast engineering, Audio over Ethernet (sometimes AoE—not to be confused with ATA over Ethernet) is the use of an Ethernet-based network to distribute real-time digital audio. It is designed to replace bulky snake cables and fixed wiring, and instead use a standard network structured cabling in a facility, providing a reliable backbone for any audio application, such as for large-scale sound reinforcement in stadiums, airports and convention centers, multiple studios or stages. While on the surface AoE bears a resemblance to Voice over IP (VoIP), AoE is intended for high-fidelity, low-latency professional audio. Because of the fidelity and latency constraints, audio over Ethernet systems generally do not utilize audio data compression. AoE systems use a much higher bit rate (typically 1 Mbit per channel) and much lower latency (typically less than 10 milliseconds) than VoIP. Audio over Ethernet requires a high-performance network. Performance requirements may be met through use of a dedicated local-area network (LAN) or virtual LAN (VLAN), overprovisioning or Quality of service features. Most AoE systems use proprietary protocol(s) (at the higher OSI layers) which create data packets and data frames that are transmitted directly onto the Ethernet (layer 2) for efficiency and reduced overhead. The word clock may be provided by broadcast packets. ==Protocols== There are several different and incompatible protocols for audio over Ethernet. For example, using category 5 cable and 100BASE-TX signaling at 100 Mbits/second, each link can generally transmit between 32 and 64 channels at a 48 kHz sampling rate. Some can handle other rates and audio bit depths, with a corresponding reduction in number of channels. AoE is not necessarily intended for wireless networks, thus the use of various 802.11 devices may or may not work with various (or any) AoE protocols. Protocols can be broadly categorized into Layer 1, Layer 2 and Layer 3 systems based on the lowest layer in the OSI model where the protocol exists. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Audio over Ethernet」の詳細全文を読む スポンサード リンク
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