0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
1. A cessation of communications or communications capability caused by a lack of power to a communications facility or equipment. 2. A total lack of communications capability caused by propagation anomalies, e.g., those present during strong auroral activity or during the re-entry of a spacecraft into the Earth's atmosphere.