Patent ID: 8634426

Claim:
A transmission device comprising: a first interface connected to a first transmission line; and a second interface connected to a second transmission line, wherein the first interface is configured to packetize a lower-order path included in a signal received from the first transmission line into a plurality of first packets, wherein the second interface is configured to transmit the first packets to the second transmission line, and to forward a second packet received from the second transmission line to the first interface, and wherein the first interface is configured to generate a transmission signal based on a plurality of the second packets, and to transmit the generated transmission signal to the first transmission line, wherein the first interface includes a first table that defines the lower-order path and a destination of the first packet, and a second table that defines the second packet and mapping information to the transmission signal, wherein the first and second tables have an active side and a waiting side, and wherein the first interface is configured to determine a side of the second table based on side information contained in the second packet.