Different system transfer method for a ring transmission system and transmission apparatus

A transmission apparatus which is transferred from a UPSR (Uni-directional Path Switched Ring) system to a BLSR (Bi-directional Line Switched Ring) system during operation, comprising:

• a control board of the BLSR system by which a control board of the UPSR system is replaced;
• a first multiplexing/demultiplexing conversion board of the BLSR system by which, when a path switch is changed over to one direction, a multiplexing/demultiplexing conversion board of the UPSR system, which is positioned in the other direction, is replaced, and which is at the same time made to operate in the UPSR system;
• a second multiplexing/demultiplexing conversion board of the BLSR system by which, when said path switch is changed over to said other direction, a multiplexing/demultiplexing conversion board of the UPSR system, which is positioned in said one direction, is replaced, and which is at the same time made to operate in the UPSR system;
• operation control means for making said first and second multiplexing/demultiplexing conversion boards operate in the BLSR system;
• and
• changing means for changing a line arrangement set at said first and second multiplexing/demultiplexing conversion boards from the UPSR system to the BLSR system.

A system transfer method in which a UPSR (Uni-directional Path Switched Ring) system having a plurality of nodes is transferred to a BLSR (Bi-directional Line Switched Ring) system during operation, comprising the steps of

• (1) replacing a control board of the UPSR system by a control board of the BLSR system in each node;
• (2) changing over a path switch in each node to the same one direction to replace a multiplexing /demultiplexing conversion board of the UPSR system in each node, which is positioned in the same other direction, by a first multiplexing/demultiplexing conversion boards of the UPSR system;
• (3) changing over said path switch in said each node to said other direction to replace a multiplexing/demultiplexing conversion board of the UPSR system in said each node, which is positioned in said one direction, by a second multiplexing/demultiplexing conversion board of the BLSR system, and at the same time, making each of said second multiplexing/demultiplexing conversion boards operate in the UPSR system;
• (4) making said first and second multiplexing/demultiplexing conversion boards operate in the BLSR system;
• and
• (5) changing a line arrangement set at said first and second multiplexing/demultiplexing conversion boards from the UPSR system to the BLSR system.

A system transfer method in which a UPSR (Uni-directional Path Switched Ring) system having a plurality of nodes is transferred to BLSR (Bi-directional Line Switched Ring) system during operation, comprising the steps of:

• (1) replacing a control board of the UPSR system by a control board of the BLSR system in a node;
• (2) changing over a path switch in said node to one direction to replace a multiplexing/demultiplexing conversion board of the UPSR system in said node, which is positioned in the other direction, by a first multiplexing/demultiplexing conversion board of the BLSR system, and at the same time, making said first multiplexing/demultiplexing conversion boards operate in the UPSR system;
• (3) changing over said path switch to said other direction to replace a multiplexing/demultiplexing conversion board of the UPSR system in said node, which is positioned in said one direction, by a second multiplexing/demultiplexing conversion board of the BLSR system and at the same time, making said second multiplexing/demultiplexing conversion boards operate in the UPSR system;
• (4) executing said steps (1), (2) and (3) for each of remaining nodes other than said node;
• (5) making said first and second multiplexing/demultiplexing conversion boards operate in the BLSR system, and
• (6) changing a line arrangement set at said first and second multiplexing/demultiplexing conversion boards from the UPSR system to the BLSR system.