A circuit rented by a customer and providing for the interconnection of a number of terminals so that any terminal can communicate individually with each of the other terminals or simultaneously with all of them.

• 一种由用户租用并用于内部连接许多终端的电路。这样，任何一台终端可以独立地与其它终端通信，或者同时与所有终端进行通信。