MT8971BP Mitel, MT8971BP Datasheet

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MT8971BP

Manufacturer Part Number
MT8971BP
Description
Digital subscriber interface circuit for digital subscriber lines, high speed data transmission over twisted wires, digital PABX line cards and telephone sets, 80 or 160 kbit/s single chip modems.
Manufacturer
Mitel
Datasheet

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Part Number
Manufacturer
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Part Number:
MT8971BP
Manufacturer:
MITEL
Quantity:
20 000
Features
Applications
F0o/RCK
DSTo/Do
C4/TCK
CDSTo/
F0/CLD
DSTi/Di
CDSTi/
Full duplex transmission over a single twisted
pair
Selectable 80 or 160 kbit/s line rate
Adaptive echo cancellation
Up to 3km (8971B) and 4 km (8972B)
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
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
RegC
MS0
MS1
MS2
CDo
CDi
Transmit
Interface
Control
Register
Transmit/
Clock
Receive
Timing &
Control
Status
Interface
Receive
Phase Locked
Master Clock
Sync Detect
Transmit
Timing
Receive
Prescrambler
Prescrambler
DPLL
De-
Figure 1 - Functional Block Diagram
ISO
V
2
DD
Scrambler
-CMOS ST-BUS
Error
Signal
V
Descrambler
SS
Echo Canceller
Address
V
Description
The MT8971B (DSIC) and MT8972B (DNIC) are
multi-function devices capable of providing high
speed, full duplex digital transmission up to 160
kbit/s over 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.
identically but with the DSIC having a shorter
maximum loop reach specification.
"DNIC" will be used to reference both devices unless
otherwise noted.
The MT8971B/72B is fabricated in Mitel’s ISO
CMOS process.
Bias
Echo Estimate
Digital Subscriber Interface Circuit
V
Ref
Digital Network Interface Circuit
Encoded Biphase
MT8971BE
MT8972BE
MT8972BC
MT8971BP
MT8972BP
+
Differentially
Transmitter
Encoded Biphase
Differentially
FAMILY
Receive
Receiver
Filter
Ordering Information
-40° C to
22 Pin Plastic DIP
22 Pin Plastic DIP
22 Pin Ceramic DIP
28 Pin PLCC
28 Pin PLCC
ISSUE 7
V
MT8971B/72B
+
Bias
Line Driver
Transmit
Both devices function
85° C
Filter &
+2
-1
MUX
The generic
May 1995
Precan
OSC2
OSC1
L
L
L
DIS
OUT
IN
OUT
9-107
9-107
2
-

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MT8971BP Summary of contents

Page 1

... ST-BUS Digital Subscriber Interface Circuit Digital Network Interface Circuit MT8971BE MT8972BE MT8972BC MT8971BP MT8972BP Description The MT8971B (DSIC) and MT8972B (DNIC) are multi-function devices capable of providing high speed, full duplex digital transmission up to 160 kbit/s over a twisted wire pair. They use adaptive echo-cancelling techniques and transfer data in (2B+D) format compatible to the ISDN basic rate ...

Page 2

MT8971B/72B 1 LOUT 2 VBias VRef 3 MS2 4 5 MS1 MS0 6 RegC 7 8 F0/CLD 9 CDSTi/CDi 10 CDSTo/CDo 11 VSS 22 PIN PDIP/CERDIP Pin Description Pin # Name DIP PLCC Line Out. Transmit Signal ...

Page 3

Pin Description (continued) Pin # Name DIP PLCC 17 22 OSC1 Oscillator Input. CMOS Input. D.C. couple signals to this pin. Refer to D.C. Electrical Characteristics for OSC1 input requirements Precan Precanceller Disable. When held to Logic ’1’ ...

Page 4

MT8971B/72B Functional Description The MT8971B/72B is a device which has been designed primarily as an interface for the Integrated Services Digital Network (ISDN). However, it may be used in practically any application that requires high speed data transmission over two ...

Page 5

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Page 6

MT8971B/72B In DIGITAL NETWORK (DN) mode, upon entering the DNIC from the DV and CD ports, the B-channel data, D-channel D0 (and D1 for 160 kbit/s), the HK bit of the C-channel (160kbit/s only) and a SYNC bit are combined ...

Page 7

Precan pin high. This mode simplifies the design of external line transceivers used for loop extension applications. The Precan pin features an internal pull-down which allows this unconnected in applications where this function is not required. The resultant signal ...

Page 8

MT8971B/72B CD port, the CDSTi and CDSTo pins are used. The SINGL port option only exists in DN mode. In MOD mode, DUAL port operation must be used and the D, B1 and B2 channel designations no longer exist. The ...

Page 9

DV Port (DSTi/Di, DSTo/Do) The DV port transfers data or PCM encoded voice to and from the line according to the particular mode selected by the mode select pins. The modes affecting the configuration of the DV port are MOD ...

Page 10

MT8971B/72B The C-channel is used for transferring control and status information between the DNIC and the system. The Control and Diagnostics Registers are accessed through the C-channel. They contain information to control the DNIC and carry out the diagnostics as ...

Page 11

C-Channel Internal Control (Bit 0-7) Register XXX01111 00000000 XXX11111 00010000 Notes: Default Mode 1 can also be selected by tying CDSTi/CDi pin low when DNIC is operating in dual mode. Default Mode 2 can also be selected by tying CDSTi/CDi ...

Page 12

MT8971B/72B 0 1 SYNC CHQual Status Name Register 0 SYNC Synchronization - When set this bit indicates that synchronization to the received line data sync pattern has been acquired. For DN mode only. 1-2 CHQual Channel Quality - These bits ...

Page 13

Bits Bit 7 Bit Data ...

Page 14

MT8971B/72B Applications Typical connection diagrams are shown in Figures 13 and 14 for the DN mode as a MASTER and SLAVE, respectively connected to the OUT coupling transformer through a resistor R2 and capacitors C2 and C2’ to ...

Page 15

Absolute Maximum Ratings Parameter 1 Supply Voltage 2 Voltage on any pin (other than supply) 3 Current on any pin (other than supply) 4 Storage Temperature 5 Package Power Dissipation (Derate 16mW/°C a bove 75°C) ** Exceeding these values may ...

Page 16

MT8971B/72B AC Electrical Characteristics Characteristics 1 Input Voltage 2 Input Current 3 Input Impedance Crystal/Clock Frequency P 5 Crystal/Clock Tolerance Crystal/Clock Duty Cycle S 6b Crystal/Clock Duty Cycle 7 Crystal/Clock Loading 8 Output Capacitance ...

Page 17

C4 0.8V 2.0V F0 0.8V Figure Clock & Frame Pulse Alignment for ST-BUS Streams in DN Mode 2.0V C4 0.8V 3.0V OSC1 2.0V Figure 17 - Frequency Locking for the C4 and OSC1 Clocks in MAS/DN ...

Page 18

MT8971B/72B AC Electrical Characteristics Characteristics 1 DSTi/CDSTi Data Setup Time 2 DSTi/CDSTi Data Hold Time 3a DSTo/CDSTo Data Delay 3b DSTo/CDSTo High Z to Data Delay † Timing is over recommended temperature & power supply voltage ranges. * Typical figures ...

Page 19

Tx Bit Stream 2.4V TCK 0.4V 2.0V Di CDI 0.8V 2.4V CDo 0.4V Rx Bit Stream t RD RCK 2.4V Do 0.4V Figure 20 - Data Timing For Master Modem Mode Bit Cell Bit ...

Page 20

MT8971B/72B 2.4V TCK 0.4V 2.0V Di CDI 0.8V 2.4V CDo 0.4V RCK 2.4V Do 0.4V Figure 21 - Data Timing for Slave Modem Mode 9-126 ¼ ...

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