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Both the proponents of the deterministic and the opportunistic techniques lobbied to develop standards for Local Area networks that would incorporate their solution. Instead of trying to find an impossible compromise between these diverging views, the IEEE 802 committee that was chartered to develop Local Area Network standards chose to work in parallel on three different LAN technologies and created three working groups. The `IEEE 802.3 working group <http://www.ieee802.org/3/>`_ became responsible for CSMA/CD. The proponents of deterministic MAC algorithms agreed on the basic principle of exchanging special frames called tokens between devices to regulate the access to the transmission medium. However, they did not agree on the most suitable physical layout for the network. IBM argued in favor of Ring-shaped networks while the manufacturing industry, led by General Motors, argued in favor of a bus-shaped network. This led to the creation of the `IEEE 802.4 working group <http://www.ieee802.org/4/>`_ to standardize Token Bus networks and the `IEEE 802.5 working group <http://www.ieee802.org/5/>`_ to standardize Token Ring networks. Although these techniques are not widely used anymore today, the principles behind a token-based protocol are still important.
Both the proponents of the deterministic and the opportunistic techniques lobbied to develop standards for Local Area networks that would incorporate their solution. Instead of trying to find an impossible compromise between these diverging views, the IEEE 802 committee that was chartered to develop Local Area Network standards chose to work in parallel on three different LAN technologies and created three working groups. The `IEEE 802.3 working group <http://www.ieee802.org/3/>`_ became responsible for CSMA/CD. The proponents of deterministic MAC algorithms agreed on the basic principle of exchanging special frames called tokens between devices to regulate the access to the transmission medium. However, they did not agree on the most suitable physical layout for the network. IBM argued in favor of Ring-shaped networks while the manufacturing industry, led by General Motors, argued in favor of a bus-shaped network. This led to the creation of the `IEEE 802.4 working group <http://www.ieee802.org/4/>`_ to standardize Token Bus networks and the `IEEE 802.5 working group <http://www.ieee802.org/5/>`_ to standardize Token Ring networks. Although these techniques are not widely used anymore today, the principles behind a token-based protocol are still important.
3 years ago

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