A second former Orckit-Corrigent patent has popped up in litigation. Ring Protection LLC has accused Colt Internet (1:18-cv-01770), Coriant (Tellabs) (1:18-cv-01773), Cox Enterprises (Cox Communications) (1:18-cv-01771), and SoftBank (Sprint) (1:18-cv-01772) of infringing the patent, which generally relates to fault protection in a bidirectional ring network. At issue are the defendants’ network architectures. Colt’s Switched Ethernet VPN service and Cox’s Internet Protocol (IP) services are both alleged to use Cisco’s ONS 15454 Multiservice Provisioning Platform (Colt’s service further identified as allegedly using Cisco’s Resilient Packet Ring (RPR) technology, but Cisco has not been named as a defendant in either case). The TITAN 6500 Multiservice Transport Switch (MTS) of Tellabs (allegedly supporting Four-Fiber Synchronous Optical Network (SONET) Bidirectional Line Switched Ring (BLSR)) and Sprint’s FTS2001 SONET architecture are also targeted.