Line protection switch equipment
AssigneeFujitsu Limited
InventorsSatoshi Ikeuchi, Ikuo Taniguchi, Kenji Yoshimoto
Life of this patent
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Abstract
A line protection switch equipment (LPSW) in a communication system, having a plurality of two-input and two-output switches connected between lines including a protection line and working lines, the switches being connected in series by a loop line which forms a loop, whereby by switching the switches connected to a faulty working line and to a protection line, the faulty working line is switched to become a protection line, and the former protection line becomes a working line.
Claims7
Line protection switch equipment in a communication system, connected between a plurality of pairs of communication lines, at least one pair of the communication lines being operatively used as a protection line and the other pairs of the communication lines being operatively used as working lines, said line protection switch equipment comprising:
- loop lines for forming a loop;
- and
- two-input and two-output switches, each connected to a corresponding one of the pairs of communication lines and to two of said loop lines corresponding thereto and switchable between two states--a normal state in which the corresponding one of the pairs of communication lines are connected together and the two loop lines corresponding thereto are connected together and a switched state in which each line in the corresponding one of the pairs of communication lines is connected to one of said loop lines corresponding thereto, whereby at least two of said switches, connected to a faulty working line and to the protection line, may be switched from the normal state to the switched state so that the faulty working line becomes the protection line and the protection line is used in place of the faulty working line.
Dependencies are inferred from the claim text.