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6.2.5.
BELL DETECTOR(SEE Fig. 19)
The AC ringing signal is detected by phoptocoupler IC2, using its internal diode in conjunction with D4. DC from the line is
blocked by C2. The other components D2, D3, and R3 reduce current and increase the circuit impedance in line with national
requirements. When ringing is detected IC2 will turn on, and the RING line will be dragged to a low voltage.
blocked by C2. The other components D2, D3, and R3 reduce current and increase the circuit impedance in line with national
requirements. When ringing is detected IC2 will turn on, and the RING line will be dragged to a low voltage.
6.2.6.
CLIP CIRCUITS (SEE Fig. 19)
The CLIP signal is detected by IC3 and sent to the BBIC through the /TXAF line as a FSK waveform. The CLIP_STATE signal
from the BBIC is used to provide a CLIP impedance through a combination of components selected from R85, R86, C93, C37,
and R1. The combination depends upon the CLIP requirements of the specific country - often there is no requirements for the
CLIP_STATE impedance.
from the BBIC is used to provide a CLIP impedance through a combination of components selected from R85, R86, C93, C37,
and R1. The combination depends upon the CLIP requirements of the specific country - often there is no requirements for the
CLIP_STATE impedance.
T10 disables the CLIP signal during the off-hook condition.
Circuit Diagram
18
KX-TCD725GM
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