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IBM 73G2042 Token Ring Card ISA Card
Token ring is a networking technology for computer networks, defined in the IEEE 802.5 specification.
It defines cable types and signaling for the physical layer, packet formats and protocols for media access control / data link layer of the OSI model.
This technology has been considered obsolete since IBM, the main representative of the token ring process, ended the marketing and sale of token rings due to the advent of inexpensive Ethernet networking technology.