detection, loop length indication and the capability of
reflecting a programmable CODEC’s impedance or
supplying a standard 600 ohm impedance to the line.
The device is fabricated as a thick film hybrid using
various technologies for optimum circuit design high
reliability.
Applications
Line Interface for
• PABX
• Intercoms
• Key Telephone Systems
• Control Systems
VX
VR
Loop
SHK
EGB
LA
WU
LCA
RE
MSE
PD
2W-4W
Converter
Line Drivers
&
Battery Feed
TIP
RING
Loop
Supervision
Constant
Current
Control
Switch
Circuits
V
MSG
V
RNG
V
EE
V
DD
V
BAT
A
GND
B
GND
Figure 1 - Functional Block Diagram
2-141
MH88614
Notes:
Advance Information
2-142
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