Patent ID: 7315511

Claim:
A transmitter of a first network type constituting a transmission system for transmitting and receiving a packetized transmission signal, said transmitter comprising: a redundancy transmission line structure comprising a plurality of transmission lines connecting an opposite transmitter of a second network type; a generating section for generating transmission-line switching information representing transmission-line switching control information about said transmission lines, packetizing the generated transmission-line switching information in a K-packet that is compatible with the transmitters of the first and second network types, and outputting said K-packet; a transmitting section for transmitting said K-packet to the opposite transmitter provided opposite through said transmission lines; a receiving section for receiving a received K-packet, which is the transmission-line switching information packetized by said opposite transmitter; a packet processing section for detecting the transmission-line switching information from said received K-packet; and a redundancy switching section capable of selecting one of said transmission lines according to a status in which the transmission-line switching information in the received K-packet from said opposite transmitter is received.