®
MH88614
Programmable CODEC SLIC
Advance Information
Features
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•
•
•
•
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•
•
•
•
•
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Transformerless 2-wire to 4-wire conversion
Battery Feed
Ringing & Messaging Facility
Power Down with Wake Up output
Automatic Ring Trip
Programmable Constant Current
Earth Ground Button detection
Switch Hook detection
Interface for a programmable CODEC
Ring ground over-current protection
Impedance reflection
Loop Length Indication
MH88614
ISSUE 2
April 1995
Ordering Information
30 Pin SIL Package
0°C to 70°C
Description
The SLIC provides a complete interface between an
industry standard programmable CODEC or DSP
and a subscriber loop.
Functions provided include battery feed, zero
crossing ring control, programmable current feed,
power down with wake up signal, cadenced
messaging facility, switch hook & dial pulse
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
2-129
MITEL [ MITEL NETWORKS CORPORATION ]
