IEEE 802.11j-2004
Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications--Amendment 7:4.9 GHz-5 GHz Operation in Japan
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Language: English
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About This Item
802.11j-2004 defines an amendment to the wireless LAN MAC and PHY specifications for 4.9 GHz to 5 GHz operation in Japan. As part of the communication, networking and broadcast technologies domain, it supports how compatible radio systems are structured for that national spectrum environment. 802.11j-2004 is relevant when product design, testing, or procurement must align with Japan-specific wireless LAN requirements while staying within the broader 802.11 framework.
802.11j-2004 overview
This standard provides technical guidance for adapting wireless LAN operation to the 4.9 GHz-5 GHz bands used in Japan. It sits within the IEEE 802.11 family and focuses on medium access control and physical layer behavior for radio interoperability. The document is useful for understanding how WLAN equipment should be configured, evaluated, or certified for this frequency range. Because 802.11j-2004 is marked superseded, it is best used as a reference for legacy design and compliance work.
Typical use cases
Typical applications include wireless LAN equipment intended for Japanese deployments where 4.9 GHz to 5 GHz spectrum support is required. It may be consulted by engineers working on access points, client devices, radio modules, and validation setups that need to match the relevant MAC and PHY rules. The standard is also useful in documentation reviews, compliance checks, and procurement decisions for systems that must operate consistently in regulated networking environments.
Why this standard matters
In practice, 802.11j-2004 helps reduce uncertainty when designing or verifying WLAN products for a specific regional frequency allocation. It gives teams a clearer technical basis for conformance testing, interface behavior, and product planning tied to Japan’s 4.9 GHz-5 GHz operation. For organizations managing legacy equipment, the standard can support consistent evaluation and lower the risk of mismatched specifications, especially when comparing device capability against regional deployment requirements.
- Wireless LAN MAC and PHY amendment
- 4.9 GHz to 5 GHz operation in Japan
- IEEE 802.11 family reference
- Legacy compliance and testing
- Regional deployment-specific requirements
- Publication Date: 2004
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies
- Official IEEE: Doi link
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