T: picture 1, top
Phone Line Indicator #2
Always indicates U
AB
(1). Indicates the ring signal by a blinking yellow
LED
.
V
AB
(0): 48 - 50 V, a free phone line
V
AB
(1): 7 - 10 V, a busy phone line
V
AB
(1): 0 V, a busy phone line
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