SONET fiber converters extend multimode fiber networks across single-mode fiber with distances up to 80km for OC12 (622Mbps) and 120km for OC3 (155Mbps). In this application, the customer's router is connected to an Add Drop Multiplexer (ADM) providing access to the SONET ring using a pair of fiber converters. The fiber converters provide the multimode to single-mode conversion. Models support dual fiber, single fiber, multimode-to-multimode, multimode-to-single-mode, and single-mode-to-single-mode conversions.
