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Please specify your question about AM ADM-S1.1+ (18dB) 16 x E1 75/120 AC PS: STM 1 SH Add Drop Multiplexer with two STM1 and 16 x E1, also configurable as STM1 Terminal Multiplexer with/without MSP, -24/-48/-60 V DC Power supply (DI =Dual Impedance). Pre-loaded with Earth SW *