IEEE 802.3ac-1998
Specific requirements Part 3: Carrier sense multiple access with collision detection (CSMA/CD) frame extensions for Virtual Bridged Local Area Networks (VLAN) tagging on 802.3 networks
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About This Item
802.3ac-1998 is a focused networking standard for Ethernet frame extensions used with Virtual Bridged Local Area Networks and VLAN tagging on 802.3 networks. It addresses how carrier sense multiple access with collision detection (CSMA/CD) frames are extended to support tagged traffic, helping define a consistent technical basis for communication equipment and network interoperability. As a superseded standard in the Communication, Networking and Broadcast Technologies area, it remains relevant for understanding legacy VLAN-related Ethernet behavior and compliance references.
802.3ac-1998 overview
This specification sets out specific requirements for frame-format extensions associated with VLAN tagging in 802.3 environments. In practical terms, 802.3ac-1998 helps clarify how Ethernet frames are handled when virtual bridging is involved, supporting consistent interpretation across connected devices. For engineers and procurement teams, the document is useful when reviewing legacy Ethernet implementations, validating protocol behavior, or tracing how tagged frame support was formalized in earlier network designs.
Typical use cases
The standard is most relevant to Ethernet hardware, switching equipment, and network interfaces that need to process VLAN-tagged frames in CSMA/CD-based 802.3 systems. It may be consulted during network design reviews, interoperability testing, or maintenance of older bridged LAN installations where tagged traffic must be handled predictably. The technical context fits communication infrastructure where frame extensions and virtual bridging rules affect packet handling across connected devices.
Why this standard matters
Even though 802.3ac-1998 is superseded, it still matters for compliance checks, legacy system support, and technical documentation where historical Ethernet behavior must be understood accurately. Clear requirements for frame extensions can reduce integration risk, improve testing consistency, and support better design control in mixed or older network environments. For organizations managing archived specifications or maintaining existing equipment, 802.3ac-1998 provides a useful reference point for VLAN-tagged Ethernet operation.
- CSMA/CD frame extension requirements
- VLAN tagging in 802.3 networks
- Virtual bridged LAN interoperability
- Legacy Ethernet reference use
- Superseded technical specification
- Publication Date: 1998
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies
- Official IEEE: Doi link
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