A submarine branching unit is a piece of equipment used inline within submarine telecommunications cable systems to allow the cable to split to serve more than one destination. For example, one branch might head for a cable landing point and others may continue.
There are several methods by which the split can be effected, which can also depend on the type of cable system:
In both types of cable system, more than one technique can be used simultaneously.
The conventional symbol used for a submarine branching unit in maps of cable routes is a small equilateral triangle with (usually) one vertex pointing towards the top of the map.
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