| 摘要 |
<p>A telemetering system for a data transmission line having a sequence of repeaters controls sequential operation from a centralized single supervisory terminal. The supervisory terminal sends an interrogation signal forward to a first repeater which sends back an answer signal relating to the status of that repeater and also sends the interrogation signal forward to the second repeater. In addition, status answer signals received from said subsequent repeaters in the sequence are transmitted backward through the repeater chain to the supervisory terminal. Thus, each repeater acts on the telemetering channel as a bidirectional repeater, repeating forwardly the interrogation signal and repeating backwardly its answer and the answer of subsequent repeaters in the sequence. Eight status parameters are detected at each repeater and monitored at the supervisory terminal. The supervisory terminal includes a clock generator, a receiver-transmitter interface, a microprocessor for processing repeater status information, a display, a selector and a bus interface. Each repeater includes a local oscillator, an error detector, an error counter, a detector of the error counter status, an answer signal generator, an answer transceiver, an interrogation transceiver and an automatic monitoring unit.</p> |
