Token Ring: Fault-tolerant, predictable, perfect for IBM mainframe environments
Networking with token ring - Token ring is a sophisticated LAN technology that is endorsed by IBM and defined by the IEEE 802.5 standard. Get more info on token ring here.

TOKEN RING

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Token ring is easy to connect to a mainframe. You can plug your network directly into an IBM AS/400 or 3174 controller.
token ring
Token Ring supports high speed.
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Token Ring is fault-tolerant. If, for example, the cable to one of your networked PCs is damaged or cut, the MAU automatically bypasses that port. Because the logical ring stays intact, your network stays up.