Patent ID: 6738579
Filing Date: 2004-05-18
Classification: H04J,H04L,Y10S

Abstract:
A synchronous digital communications system for optically transmitting electric signals wherein the electric signals to be transmitted are converted from electrical to optical form (E/O1, E/O1, E/On) and then transmitted using wavelength-division multiplexing, comprising:a plurality of optical lines providing optical connections, using a plurality of wavelengths (&lgr;1, &lgr;n) between network elements, wherein at least one optical connection is a nonswitched connection using at least one wavelength (&lgr;1), said at least one optical connection continuously transferring synchronization signals between network elements, and wherein at least one further optical connection is switched using at least one further wavelength (&lgr;2, &lgr;n), said at least one further optical connection transferring information between network elements.