IEEE 802.3at-2009
Part 3: CSMA/CD Access Method and Physical Layer Specifications Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements
Available Formats:
Availability: Immediate Download
Language: English
License Type: Single User
Updates: Not Included
About This Item
802.3at-2009 is a communication and networking standard that defines Amendment 3 to Part 3 of the CSMA/CD Access Method and Physical Layer Specifications, with a focus on Data Terminal Equipment (DTE) power via the Media Dependent Interface (MDI) enhancements. It is relevant for Ethernet-based systems where power delivery and data transmission need to work together in a controlled, interoperable way. As a superseded document, 802.3at-2009 is most useful for reference, comparison, and legacy design support.
About 802.3at-2009
This specification addresses enhancements to DTE power delivery over the MDI within the IEEE 802.3 family. In practical terms, it helps define how powered devices and supplying equipment can exchange power over Ethernet cabling while maintaining the electrical and signaling expectations of the underlying physical layer. 802.3at-2009 is important when reviewing interface requirements, compatibility expectations, or historical revisions to Ethernet power-related design rules.
Where is 802.3at-2009 used?
This standard is typically used in Ethernet equipment planning, network interface design, and procurement contexts where power-over-data cabling is part of the system architecture. It may apply to access points, IP phones, networked cameras, and similar devices that receive power through the MDI in communication and broadcast technology environments. Engineers and integrators may also consult 802.3at-2009 when assessing legacy installations or comparing revision history within the IEEE 802.3 series.
Importance in practice
In practice, 802.3at-2009 supports consistency in how DTE power features are specified and evaluated across Ethernet-based products. That matters for compliance review, device interoperability, and reducing integration risk when power and data share the same cabling path. The standard can also help with testing and design control by giving teams a defined technical reference for MDI-related power enhancements. For buyers and engineers, it provides a clearer basis for matching equipment requirements to the intended network application.
- IEEE 802.3 family amendment
- DTE power via MDI
- Ethernet physical layer context
- Legacy reference document
- Interop and compliance support
- Publication Date: 2009
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies
- Official IEEE: Doi link
- New Version Available: 802.3 (2025)
- Previous Version: 802.3 (2024)
- Previous Version: 802.3 (2023)
- Previous Version: 802.3 (2023)
- Previous Version: 802.3 (2023)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2022)
- Previous Version: 802.3 (2021)
- Previous Version: 802.3 (2021)
- Previous Version: 802.3 (2021)
- Previous Version: 802.3 (2021)
- Previous Version: 802.3 (2021)
- Previous Version: 802.3 (2020)
- Previous Version: 802.3 (2020)
- Previous Version: 802.3 (2020)
- Previous Version: 802.3 (2020)
- Previous Version: 802.3 (2020)
- Previous Version: 802.3 (2019)
- Previous Version: 802.3 (2019)
- Previous Version: 802.3 (2019)
- Previous Version: 802.3 (2019)
- Previous Version: 802.3 (2018)
- Previous Version: 802.3 (2018)
- Previous Version: 802.3 (2017)
- Previous Version: 802.3 (2017)
- Previous Version: 802.3 (2017)
- Previous Version: 802.3 (2017)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2016)
- Previous Version: 802.3 (2015)
- Previous Version: 802.3 (2014)
- Previous Version: 802.3 (2013)
- Previous Version: 802.3 (2012)
- Previous Version: 802.3 (2011)
- Previous Version: 802.3 (2011)
- Previous Version: 802.3 (2011)
- Previous Version: 802.3 (2010)
- Previous Version: 802.3 (2010)
- Previous Version: 802.3 (2010)
- This Version: 802.3 (2009)
- Previous Version: 802.3 (2009)
- Previous Version: 802.3 (2009)
- Previous Version: 802.3 (2008)
- Previous Version: 802.3 (2007)
- Previous Version: 802.3 (2007)
- Previous Version: 802.3 (2006)
- Previous Version: 802.3 (2006)
- Previous Version: 802.3 (2006)
- Previous Version: 802.3 (2006)
- Previous Version: 802.3 (2005)
- Previous Version: 802.3 (2004)
- Previous Version: 802.3 (2004)
- Previous Version: 802.3 (2003)
- Previous Version: 802.3 (2003)
- Previous Version: 802.3 (2002)
- Previous Version: 802.3 (2002)
- Previous Version: 802.3 (2000)
- Previous Version: 802.3 (2000)
- Previous Version: 802.3 (1999)
- Previous Version: 802.3 (1998)
- Previous Version: 802.3 (1998)
- Previous Version: 802.3 (1997)
- Previous Version: 802.3 (1996)
- Previous Version: 802.3 (1995)
- Previous Version: 802.3 (1993)
- Previous Version: 802.3 (1992)
- Previous Version: 802.3 (1990)
- Previous Version: 802.3 (1987)
- Previous Version: 802.3 (1984)
Please request information about the document. Contact Page
Need This Standard?
Request a personalized quote today to receive the latest edition in PDF or other available formats.
Need This Standard?
Request a personalized quote today to receive the latest edition in PDF or other available formats.
Summarize with AI
Get quick summaries using your favorite AI engine.
