MITEL MT8931BC

CMOS ST-BUS FAMILY MT8931B
Subscriber Network Interface Circuit
Preliminary Information

Features
•
•
•
•
•
ISSUE 2
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
August 1993
Ordering Information
MT8931BC
28 Pin Ceramic DIP
MT8931BE
28 Pin Plastic DIP
MT8931BP
44 Pin PLCC
-40°C to +85°C
Description
d
e
et
e
d
• Complete loopback testing capabilities
h
n
n
s
e
g
• On chip HDLC D-channel protocoller
i
ta
m
s
a
• 8 bit Motorola/Intel microprocessor interface
m De 1C 1B d
• Microprocessor-controlled operation o
c ew 893 93
e
• Mitel ST-BUS interface
8 D-channel protocoller is included and
R N T An
THDLC
• Low power CMOS technology
t
M
controlled
r e M ullport. through a Motorola/Intel microprocessor
o
o
• Single 5 volt power supply
N f e rf
S y fo The MT8931B is fabricated in Mitel’s CMOS process.
Applications
•
•
The MT8931B Subscriber Network Interface Circuit
(SNIC) implements the CCITT I.430 and ANSI
T1.605 Recommendations for the ISDN S and T
reference points. Providing point-to-point and pointto-multipoint digital transmission, the SNIC may be
used at either end of the subscriber line (NT or TE).
r
•
•
•
•
•
cto
a
f
t
l
u
ISDN NT1
ISDN S or T interface
ISDN Terminal Adaptor (TA)
Digital sets (TE1) - 4 wire ISDN interface
Digital PABXs, Digital Line Cards (NT2)
s
n
Co
DSTi
D-channel Priority
Mechanism
ST-BUS
Interface
LTx
S-Bus
Link
Interface
DSTo
VBias
LRx
F0od
PLL
C4b
HDLC
Transceiver
Timing
and
Control
F0b
STAR/Rsto
Link
Activation
Controller
VDD
XTAL1/NT
XTAL2/NC
VSS
Microprocessor Interface
Rsti
HALF
AD0-7
R/W/WR
DS/RD
AS/ALE
CS
IRQ/NDA
Figure 1 - Functional Block Diagram
10-71
MT8931B
Notes:
10-72
Preliminary Information
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