THE "LONG BRIDGE"

David D. Clark, Kenneth T. Pogran, and David P. Reed, "An Introduction to Local Area Networks," Local Area Networks: the State of the Art, 1982

In this case, the two subnetworks cannot be made physically adjacent, so a half-bridge is attached to each, and a full-duplex communications link is employed to interconnect the two half-bridges. The control and filter functions, and the packet buffers, are replicated in each half-bridge.