The FOXBORO P0926AH is a passive fiber optic splitter/combiner (distribution unit) designed for Foxboro I/A Series DCS fiber optic LAN networks. It operates on IEEE 802.4 standards, performing quadruple-to-dual (4-to-2) and dual-to-quadruple (2-to-4) signal conversion. This module connects a fault-tolerant pair of Fiber Optic Carrierband LAN Interfaces to a pair of redundant active concentrators, maintaining network redundancy while simplifying cabling.