| 摘要 |
A full duplex data modem for general application, e.g., cable system signal distribution, terrestrial or satellite radio link, or the like includes transmit and receive portions for permitting reliable communications between plural stations coupled to the common communications link. In accordance with the present invention, a fixed value is applied to a modem adapted in a test mode to speak with itself, and the number of transitions counted at the modem receiver output, to measure the error rate of an entire system.
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