 The modem in the Minitel terminal thus operated at 1,200 bit/s for reception, and 75 bit/s for sending commands back to the servers.Three U.S. companies became famous for high-speed versions of the same concept.Telebit introduced its "Trailblazer" modem in 1984, which used a large number of 36 bit/s channels to send data one-way at rates up to 18,432 bit/s.