®
MH88620IN
C.O. SLIC
Preliminary Information
Features
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600 ohm input impedance
Externally selectable network balances
Transformerless 2-4 wire conversion
Programmable constant resistance feed
Off-hook and dial pulse detection
High immunity to externally induced longitudinal
currents
Auto ring trip
On-hook transmission (ANI) capability
Minimum protection circuitry required
Compatible with requirements of CDOT DOC/
FCC, CSA/UL,CCITT
Excellent power dissipation (SIL vertical
mounting)
MH88620IN
ISSUE 3
April 1995
Ordering Information
40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88620IN SLIC provides all of the
functions required to interface 2-wire off premise
subscriber loops to a serial TDM, PCM, switching
network of a modern PBX. The MH88620IN is
manufactured using thick film hybrid technology
which offers high voltage capability, reliability and
high density resulting in significant printed circuit
board area savings. A complete line card can be
implemented with very few external components.
Applications
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On/Off-Premise PBX Line Cards
Central Office Line Cards
VBat
LGND
LCA
VDD
VEE
AGND
RING
RF1
RF2
TIP
TF1
TF2
Matched
Feed
Resistors
Driver
Circuitry
and
Speech
Circuit
Loop
Current
Set
Switch-Hook
Threshold Set
Ring
Filter
SHK
Switch-Hook
Detect
2W/4W
Auto Ring
Trip
Impedance
Network
conversion
N1
N2
TRD
Test Relay
Driver
Ring Relay
Driver
Gain Adjust
TRC RGND VRLY RNGC RRD
Z1
Z2
GRX1 GRX0 RX GTX1 GTX0 TX
Figure 3 - Functional Block Diagram
2-159
MITEL [ MITEL NETWORKS CORPORATION ]
