S-COM 6K Owner's Manual page 39

burst (caused by the beginning of the first digit). If you wait too long between digits, the muting will
end. The next digit you enter will cause a short burst at the beginning. The Mute Delay Timer
initially defaults to 0.5 seconds, but it can be reprogrammed with a different value if desired.
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6K V1.02 03-16-91