An optical signal connection apparatus comprising a first node and a second node connects first and second optical signal transmission lines to respective first and second routers. The first node includes a first port coupled to the first router via the first optical signal transmission line, and is configured to handle a first type of optical signals associated with the first router. The second node includes a second port coupled to the second router via the second optical signal transmission line, and is configured to handle a second type of optical signals associated with the second router. The information regarding the first type of optical signal is compared with information regarding the second type of optical signal to determine whether or not the first and second optical signal transmission lines are compatible to each other.