MT90812 Datasheet, PDF (1/105 Pages) Mitel Networks Corporation – Integrated Digital Switch (IDX)

Features
• 192 channel x 192 channel non-blocking
switching
• 2 local bus streams @ 2Mb/s supports up to 64
channels
• In TDM mode, the expansion bus supports up
to 128 channels at 8.192 Mb/s
• Rate conversion capability between local and
expansion bus streams
• Integrated conference bridge, supporting 15
parties over 5 bridges
• Integrated PLL
• Frequency Shift Keying (FSK) 1200 baud
transmitter, meeting Bell 202 or CCITT V.23
standards
• 32 channel dual tone generator, including 16
standard DTMF tones and tone ringer
• Expansion bus in IDX Link mode, allows the
interconnection of up to 4 IDX devices
• Programmable per channel gain control from +3
to -27dB, increments of 1dB for output channels
• Supervisory signalling cadence detection
capability
• HDLC resource allocator
• D-channel buffering of message information
• C-channel access for control and status
registers
• Provides both variable and constant delay
modes
• Parallel microprocessor port, compatible to Intel
and Motorola and National CPU’s
• Supports both A-law or u-law operation
• Supports both ST-BUS, GCI and HMVIP
framing formats
Applications
• Computer Telephony Integration (CTI)
• Key Telephone Systems
• Private Branch Exchange (PBX) Systems
MT90812
Integrated Digital Switch (IDX)
Advance Information
DS5219
ISSUE 2
December 1999
Ordering Information
MT90812AP
68 Pin PLCC
MT90812AL
64 Pin MQFP
-40 to +85°C
Description
By integrating key functions needed in voice telecom
application, the Integrated Digital Switch (IDX)
provides a solution-on-a-chip for key telephone
systems, PBX applications or CTI designs. Figure 2
shows a typical configuration.
The MT90812 provides non-blocking timeslot
interchange capability for B, C and D channels, up to
a maximum of 192 channels. It offers conference call
capability for 15 parties over a maximum of 5
conference bridges. With its integrated PLL, the
MT90812 provides the necessary clocks to support
peripheral devices, such as codecs or
interconnected IDX devices. Integrated into the IDX
is the capability to detect supervisory signalling and
to generate FSK 1200-baud signals. In addition, an
integrated digital tone generator produces
continuous dual tones, including standard DTMF.
With its programmable gain control, the IDX allows
users to use codecs without gain control and also
centrally manage conference calls.
To support both small and large switching platforms,
a built-in expansion Bus allows the interconnection of
up to 4 IDX devices or external components such as
digital switches. When 4 IDX devices are
interconnected, the array is capable of switching 256
channels (64x4), handling 60 conference parties
(15x4) and generating additional tones including
programmable ones. Other functions are also
increased in this configuration. The functional block
diagram is shown in Figure 1.
An evaluation board, MEB90812, is available
complete with software and a user manual, which
demonstrates the layout of a typical application
board and facilitates the use of the MT90812, and
peripheral devices such as Mitel’s DNIC products.
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