In order to eliminate erroneous map matching, when a link is set on a road, the direction and distance the link is displaced are calculated in accordance with the width of the road and the width of a road paralleled to the road, or the positional relationship of both roads in road network. The framer comprises a transport layer and a data link layer, and the framer is configured to frame one or more samples from the data converters to frames according to a serialized interface. This additional fiber is chosen to have a slope for its wavelength versus dispersion behavior that is the negative of that for the transmission fiber.