IEEE 802.3af-2003
Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications - Data Terminal Equipment (DTE) Power Via Media Dependent Interface (MDI)
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About This Item
802.3af-2003 is a communication and networking standard that defines Part 3 of the CSMA/CD access method and physical layer specifications for Data Terminal Equipment power via the Media Dependent Interface. It is relevant to wired Ethernet-style systems where power delivery and data transmission need to work together through the same interface. As a superseded technical document, 802.3af-2003 remains important for identifying legacy requirements, comparing revisions, and supporting engineering or procurement decisions.
About 802.3af-2003
This standard focuses on how Data Terminal Equipment can receive power through the Media Dependent Interface within a CSMA/CD-based network environment. It sits within the broader 802.3 family and addresses the technical relationship between physical layer signaling and power delivery. For product selection and compliance review, 802.3af-2003 helps define the expected interface behavior, connection requirements, and the scope of equipment compatibility for implementations that rely on media-based power transfer.
Where is 802.3af-2003 used?
802.3af-2003 is commonly associated with networked equipment that may be powered through Ethernet cabling, especially devices built around the IEEE 802.3 media interface. Typical applications can include access devices, communication endpoints, and other Data Terminal Equipment that depend on coordinated power and data delivery. In practice, the standard is useful wherever engineers need to verify interface expectations for wired communication hardware, particularly in installations that require a defined power-via-MDI approach.
Importance in practice
In practice, 802.3af-2003 supports consistent design and testing of equipment that must operate across a shared data-and-power interface. It helps reduce ambiguity during specification review, interoperability checks, and legacy support planning. Because the document is superseded, it is especially useful for compliance tracing, maintenance of installed systems, and comparison against later revisions. For procurement and engineering teams, the standard provides a clear reference point for evaluating compatibility and technical risk.
- CSMA/CD physical layer context
- Power via Media Dependent Interface
- Data Terminal Equipment requirements
- Legacy 802.3 compatibility reference
- Superseded specification tracking
- Publication Date: 2003
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies
- Official IEEE: Doi link
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