speed,over aduplex digital pair. They useupadaptive
kbit/s
twisted wire
o o
techniques
transfer data in
N f e M
echo-cancelling compatible to and ISDN basic rate.
(2B+D) format
the
Several modes of operation allow an easy interface
Applications
Se
to digital telecommunication networks including use
•
•
•
•
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
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 MT8971B/72B is fabricated in Mitel’s ISO
2
-
CMOS process.
Ordering Information
MT8971BE
22 Pin Plastic DIP
MT8972BE
22 Pin Plastic DIP
MT8972BC
22 Pin Ceramic DIP
MT8971BP
28 Pin PLCC
MT8972BP
28 Pin PLCC
-40°C to
+
85°C
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
9-113
MT8971B/72B
Notes:
9-114
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