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dual-attached

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dual-attached - The form of FDDI interface where a device is connected to both FDDI token-passing rings, so that uninterrupted operation continues in the event of a failure of either of the rings. All connections to the main FDDI rings are dual-attached. Typically, a small number of critical infrastructure devices such as routers and concentrators are dual-attached, whereas host computers are normally single-attached or dual-homed to a router or concentrator.

For example, a ring could be formed between a single router and two concentrators (all dual-attached) then all other components that need to be fault-tolerant (typically file servers) can be dual-homed to both concentrators.


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Hiway Technologies network backbone comprises two BigIron 4000 routers operating in a redundant configuration for 15 dual-attached FastIron 24 port workgroup switches with dual Gigabit Ethernet uplinks.
Backbone server connections will include both OC-12 and OC-3 high-speed ATM connections with some that will be dual-attached for redundancy.
Motorola has also chosen the RNS 1250 Series of single-and dual-attached FDDI cards, which will be used in its VME-based XR Series "EXCHANGE READY" Systems, targeted for telecommunications Original Equipment Manufacturers, System Integrators and Value-Added Resellers.
 
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