Request InfoTC Communications Inc.The Multiple-Master Self-Healing Ring from TC Communications Inc. can recover link failures in a fiber optic communications network and is available with the company's 8/12 channel Fiber Optic Multi-Drop Multiplexer. The multiplexer provides two pairs of fiber interfaces, and it interconnects up to 12 devices with independent RS-232 and RS-485 interfaces over single- or multimode fiber optic cable. 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