MT8931C
CMOS ST-BUS™ FAMILY
Subscriber Network Interface Circuit
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ETS 300-012, CCITT I.430 and ANSI T1.605
S/T interface
Full-duplex 2B+D, 192 kbit/s transmission
Link activation/deactivation
D-channel access contention resolution
Point-to-point, point-to-multipoint and star
configurations
Master (NT)/Slave (TE) modes of operation
Exceeds loop length requirements
Complete loopback testing capabilities
On chip HDLC D-channel protocoller
8 bit Motorola/Intel microprocessor interface
Microprocessor-controlled operation
Mitel ST-BUS interface
Low power CMOS technology
Single 5 volt power supply
ISSUE 4
November 1997
Ordering Information
MT8931CE
28 Pin Plastic DIP
MT8931CP
44 Pin PLCC
-40°C to +85°C
Description
The MT8931C Subscriber Network Interface Circuit
(SNIC) implements the ETSI ETS 300-012, CCITT
I.430 and ANSI T1.605 Recommendations for the
ISDN S and T reference points. Providing point-to-
point and point-to-multipoint digital transmission, the
SNIC may be used at either end of the subscriber
line (NT or TE).
An HDLC D-channel protocoller is included and
controlled through a Motorola/Intel microprocessor
port.
The MT8931C is fabricated in Mitel’s CMOS process.
Applications
•
•
•
•
•
ISDN NT1
ISDN S or T interface
ISDN Terminal Adaptor (TA)
Digital sets (TE1) - 4 wire ISDN interface
Digital PABXs, Digital Line Cards (NT2)
DSTi
DSTo
ST-BUS
Interface
D-channel Priority
Mechanism
LTx
S-Bus
Link
Interface
VBias
LRx
F0od
C4b
F0b
STAR/Rsto
XTAL1/NT
XTAL2/NC
Microprocessor Interface
VSS
Timing
and
Control
PLL
HDLC
Transceiver
Link
Activation
Controller
VDD
Rsti
HALF
AD0-7
R/W/WR
DS/RD
AS/ALE
CS
IRQ/NDA
Figure 1 - Functional Block Diagram
9-71
MITEL [ MITEL NETWORKS CORPORATION ]
