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What does it mean when my little green LED on the ISDN NT-1 card is blinking?

April 26, 2017blinking card ISDN LED little mean nt-1

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What does it mean when my little green LED on the ISDN NT-1 card is blinking?

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That means either no ISDN line connected, or the line is not functioning properly. With no line connected, the LED should flash evenly about 5 times per second. When a good ISDN line plugged in to the “U”port, the LED should revert to a steady “on” condition.