Patent ID: 6583900
Filing Date: 2003-06-24
Classification: H04J

Abstract:
A transmission ring system transmitting a plurality of wavelength channels, comprising:a first bi-directional transmission line on which some of the wavelength channels are transmitted in a first direction, and the others of the wavelength channels are transmitted in a second direction, the first bi-directional transmission line being used for current use; a second bi-directional transmission line on which some of the wavelength channels transmitted in the second direction on the first bi-directional transmission line are transmitted in the first direction, and the others of the wavelength channels transmitted in the first direction on the first bi-directional transmission line are transmitted in the second direction, the second bi-directional transmission line being used for standby use; and a plurality of nodes, each of which accommodates both the first bi-directional transmission line and the second bi-directional transmission line.