PCBS
November 29, 1999
2-42
2.4.3 NCU (US)
Ring
Detection
Circuit
O H D I S W
TIP
RING
T 1
T 2
T R X D
Current
Sensor
Hook1
Hook0
O H D I S W .
N C U
J P 7
J P 8
ExRing
C M L
Relay
Noise
Filter
Surge
Protection
O v e r -
current
Protection
Surge
Protection
DC Loop
L-
Transformer
C M L S W
Noise
Filter
D B 1
H306D505.WMF