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The first stage of the muon trigger electronic system for the LHCb experiment will be described.The LHCb muon trigger [1][2] has been designed to detect muon tracks with large transverse momentum and the architecture relays on 1248 Trigger Sectors (TS) built by the first stage of the electronic chain.About 120,000 physical channels are firstly merged to generate ~ 26,000 logical channels both in the chambers front-end and in the Intermediate Board (IB) system.Then in the Off Detector Electronics (ODE) boards, the logical channels are synchronized to the bunch crossing, arranged to implement the required trigger sectors, and, finally, sent to the Level-0 (L0) trigger logic through 1248 optical links at 1.6 Gbit/s.The ODE board provides also a measure of the signal arrival times with a 1.5 ns time resolution and implements the L0-pipelines, the DAQ interface via a 1.6 Gbit/s optical link and the ECS interface.