Patent ID: 6614754
Filing Date: 2003-09-02
Classification: H04J

Abstract:
A bi-directional line switched ring network system, comprising:a plurality of optical fiber communications lines, a plurality of nodes connected by said plurality of optical fiber communications lines in such a manner as to form a closed circuit, each of said plurality of nodes performing an addition and a drop of a path between an external communications apparatus and said optical fiber communications lines, or permitting said path on said optical fiber communications lines to pass through, or performing a change of a direction of said path, and a control unit located in each of said plurality of nodes so as to control the addition, the drop, the pass-through and the direction change of said path, wherein when said path passes through each of said plurality of nodes, said control unit sets a time slot number of said path in being inputted into said node and a time slot number of said path in being outputted from said node independently of each other.