IEEE P802.3at/D4.2, Jun 2009
Specific requirements Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Amendment: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements
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Language: English
License Type: Single User
Updates: Not Included
About This Item
P802.3at/D4.2, Jun 2009 is an English draft standard for Ethernet-based communication and networking technologies, focused on Carrier Sense Multiple Access with Collision Detection (CSMA/CD) and amendments for Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI). It is relevant to systems that combine data connectivity with power delivery over cabling, helping define how equipment should interoperate and be evaluated. For engineering, compliance, and procurement, P802.3at/D4.2, Jun 2009 provides a precise technical reference.
Overview of P802.3at/D4.2, Jun 2009
This draft specifies requirements within the IEEE 802.3 framework, with particular attention to DTE power enhancements delivered through the MDI. Its technical context is Ethernet access and physical-layer behavior, where signaling and power-sharing must work together reliably. P802.3at/D4.2, Jun 2009 is useful when assessing how powered devices and network equipment are intended to function under defined requirements, especially during design review, specification comparison, and standards-based testing.
Typical use cases
P802.3at/D4.2, Jun 2009 is typically consulted for Ethernet equipment that may receive power over the same interface used for data transmission. That includes network terminals, connected devices, and infrastructure components involved in powered network links. It is especially relevant in environments where cabling simplicity, installation consistency, and controlled power delivery matter, such as office networks, communications rooms, and field-deployed networking systems. The document helps align device design with the expected MDI power enhancements.
Why it matters
This standard matters because it supports clear technical expectations for power-enabled Ethernet implementations. Using P802.3at/D4.2, Jun 2009 can help reduce compatibility risks between equipment from different designs or suppliers, and it gives teams a reference point for compliance checks and verification planning. For product development and sourcing, it supports more consistent decision-making around interface behavior, testing scope, and interoperability where DTE power via the MDI is part of the requirement.
- IEEE 802.3 draft context
- CSMA/CD and physical layer requirements
- DTE power via MDI enhancements
- Ethernet interoperability reference
- Compliance and verification support
- Publication Date: 2009
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies
- Official IEEE: Doi link
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