AN ARCHITECTURE FOR OPTICAL RING TRUNK-TRANSMISSION NETWORKS

This paper provides an architectural study of optical ring trunk-trans mission networks using either Time Division Multiplexing (TDM) or Wave length Division Multiplexing (WDM). A timeslot arrangement algorithm f or distributed controlled TDM rings is proposed that minimizes the num ber of slots (wavelengths) required in bi-directional ring networks. T his algorithm is applied in a straight-forward manner to wavelength ar rangement in WDM ring networks. The technique, characterized by timesl ot (or wavelength) conversion, realizes common add/drop procedures in all Add/Drop Multiplexers (ADMs) when they are connected logically in a mesh topology. A self-healing algorithm is also proposed for network restoration. It offers good performance in terms of protection line-c apacity, restoration delay, and survivability against multiple failure s.