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Please specify your question about AM ADM-L4.2 (24dB) 16 x E1 75/120 DC PS: STM 4 LH Add Drop Multiplexer with two STM-4 and 16 x E1, - 24/-48/-60 V DC Power supply (including mounting bracket and installation guide) (DI = Dual Impedance) Pre-loaded with Earth SW *