|
Phone Line Indicator #3 Always indicates VAB(1). Indicates the ring signal by a yellow LED. |
|
|
VAB(0): a free phone line, VC = 49 V VAB(1): a busy phone line, VC = 8 V VAB(1): a busy phone line, VC = 0 V ûAB(0R): a free phone line with a ring signal, ûC = 150 V |
|