Communication apparatus, method of communication and communication system

A method of communication using a communication apparatus coupled to a router included in a first network and a multiplexer that multiplexes a plurality of optical signals having different wavelengths transmitted from the communication apparatus, the method comprising:

• transmitting and receiving a first signal to and from the router;
• transmitting and receiving a second signal to and from another communication apparatus in a second network through the multiplexer, the second signal having a transmission scheme different from the first signal;
• mutually converting the first signal and the second signal with each other;
• detecting a first communication disabled state between the another communication apparatus and the communication apparatus;
• and
• transmitting, to the router, a first detection signal for detecting adjacency relationship between the communication apparatus and the router when the first communication disabled state is detected.

A communication system comprising:

• a router included in a first network;
• a communication apparatus coupled to the router;
• and
• a multiplexer coupled to the communication apparatus and multiplexes a plurality of optical signals having different wavelengths transmitted from the communication apparatus, wherein the communication apparatus further comprises:
• a memory;
• and
• a processor coupled to the memory and configured to:
• transmit and receive a first signal to and from the router,
• transmit and receive a second signal to and from another communication apparatus in a second network through the multiplexer, the second signal having a transmission scheme different from the first signal,
• mutually convert the first signal and the second signal with each other,
• detect a first communication disabled state between the another communication apparatus and the communication apparatus, and
• transmit, to the router, a first detection signal for detecting adjacency relationship between the communication apparatus and the router when the first communication disabled state is detected.