®
ISO
2
-CMOS ST-BUS™ FAMILY
MT9171/72
Digital Subscriber Interface Circuit
Digital Network Interface Circuit
Features
•
•
•
•
•
•
•
•
•
Full duplex transmission over a single twisted
pair
Selectable 80 or 160 kbit/s line rate
Adaptive echo cancellation
Up to 3km (9171) and 4 km (9172)
ISDN compatible (2B+D) data format
Transparent modem capability
Frame synchronization and clock extraction
MITEL ST-BUS compatible
Low power (typically 50 mW), single 5V supply
ISSUE 1
May 1995
Ordering Information
MT9171AE
22 Pin Plastic DIP
MT9172AE
22 Pin Plastic DIP
MT9172AC
22 Pin Ceramic DIP
MT9171AN
24 Pin SSOP
MT9172AN
24 Pin SSOP
MT9171AP
28 Pin PLCC
MT9172AP
28 Pin PLCC
-40°C to
+
85°C
a twisted wire pair.
They use adaptive echo-
cancelling techniques and transfer data in (2B+D)
format compatible to the ISDN basic rate. Several
modes of operation allow an easy interface to digital
telecommunication networks including use as a high
speed limited distance modem with data rates up to
160 kbit/s. Both devices function identically but with
the DSIC having a shorter maximum loop reach
specification. The generic "DNIC" will be used to
reference both devices unless otherwise noted.
The MT9171/72 is fabricated in Mitel’s ISO
2
-CMOS
process.
Applications
•
•
•
•
Digital subscriber lines
High speed data transmission over twisted
wires
Digital PABX line cards and telephone sets
80 or 160 kbit/s single chip modem
Description
The MT9171 (DSIC) and MT9172 (DNIC) are multi-
function devices capable of providing high speed,
full duplex digital transmission up to 160 kbit/s over
DSTi/Di
CDSTi/
CDi
Transmit
Interface
Prescrambler
Scrambler
Differentially
Encoded Biphase
Transmitter
Transmit
Filter &
Line Driver
L
OUT
F0/CLD
C4/TCK
F0o/RCK
MS0
MS1
MS2
RegC
Control
Register
Transmit
Timing
V
Bias
Address
Echo Canceller
Error
Signal
Echo Estimate
—
DPLL
MUX
L
OUT
DIS
Master Clock
Phase Locked
Transmit/
Clock
Receive
Timing &
Control
Sync Detect
Status
Receive
Precan
∑
+
Receive
Filter
-1
+2
L
IN
OSC2
DSTo/Do
CDSTo/
CDo
Receive
Interface
De-
Prescrambler
Descrambler
Differentially
Encoded Biphase
Receiver
OSC1
V
DD
V
SS
V
Bias
V
Ref
Figure 1 - Functional Block Diagram
9-133
MITEL [ MITEL NETWORKS CORPORATION ]
