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A "B" (Bridge) link is a SL (Signalling Link) that connects an STP (Signalling Transfer Point) to another STP. Typically, a quad of "B" links interconnect peer (or primary) STPs (e.g. the STPs from one network to the STPs of another network). The distinction between a "B" link and a "D" link is rather arbitrary. For this reason, such links may be referred to as "B/D" links.
