®
CMOS ST-BUS™ FAMILY
MT8986
Multiple Rate Digital Switch
Features
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•
•
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•
•
•
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256 x 256 or 512 x 256 switching configurations
8-bit or 4-bit channel switching capability
Guarantees frame integrity for wideband
channels
Automatic identification of ST-BUS/GCI
interfaces
Accepts serial streams with data rates up to
8.192 Mb/s
Rate conversion from 2.048 Mb/s to 4.096 or
8.192 Mb/s and vice-versa
Programmable frame offset on inputs
Per-channel three-state control
Per-channel message mode
Control interface compatible to Intel/Motorola
CPUs
Low power consumption
ISSUE 3
May 1995
Ordering Information
MT8986AC
40 Pin Ceramic DIP
MT8986AE
40 Pin Plastic DIP
MT8986AP
44 Pin PLCC
MT8986AL
44 Pin QFP
-40°C to +85°C
Description
The Multiple Rate Digital Switch (MRDX) is an
upgraded version of MITEL's MT8980D Digital
Switch (DX). It is pin compatible with the MT8980D
and retains all of its functionality. This device is
designed to provide simultaneous connections (non-
blocking) for up to 256 64kb/s channels or blocking
connections for up to 512 64kb/s channels. The
serial inputs and outputs connected to MT8986 may
have 32 to 128 64kb/s channels per frame with data
rates ranging from 2048 up to 8192 kb/s. The
MT8986 provides per-channel selection between
variable and constant throughput delays allowing
voice and grouped data channels to be switched
without corrupting the data sequence integrity.
In addition, the MT8986 can be used for switching of
32 kb/s channels in ADPCM applications. The
MT8986 is ideal for medium size mixed voice and
data switching/processing applications.
V
DD
V
SS
ODE
Applications
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Medium size digital switch matrices
Hyperchannel switching (e.g., ISDN H0)
MVIP
™
interface functions
Serial bus control and monitoring
Centralized voice processing systems
Voice/Data multiplexer
32 kbit/s channel switching
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*
*
*
*
*
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
STi8
STi9
STi10
STi11
STi12
STi13
STi14
STi15
Serial
to
Parallel
Converter
Timing
Unit
Multiple Buffer Data
Memory
Output
MUX
Parallel
to
Serial
Converter
Connection
Memory
STo0
STo1
STo2
STo3
STo4
STo5
STo6
STo7
STo8 *
STo9 *
Internal Registers
Microprocessor
Interface
* 44 Pin only
CLK FR AS/ IM
ALE *
DS CS
RD
R/W A0/ DTA AD7/
AD0
WR A7
CSTo
Figure 1 - Functional Block Diagram
2-63
MITEL [ MITEL NETWORKS CORPORATION ]
