Scientech Technologies Pvt. Ltd. Manufactures Multiplexer/Demultiplexer Coder/Decoder Trainer, ST2503. Scientech Technologies Pvt. Ltd. Is an ISO 9001:2000 certified company. The Multiplexer/Demultiplexer Coder/Decoder Trainer can be used in all required inputs and connections for students which help in studying Analog Time Division Multiplexing/Demultiplexing, Pulse Position Modulation and Manchester Encoding/ Decoding technique; Digital Time Division Multiplexing/ Demultiplexing of signals, etc.