Description
The MT90866 Digital Switch provides switching capacities of 4,096 x 2,432 channels between backplane and local streams, 2,432 x 2,432 channels among local streams and 2,048 x 2,048 channels among backplane streams. The local connected serial inputs and outputs have 32, 64 and 128 64kb/s channels per frame with data rates of 2.048, 4.096 and 8.192Mb/s respectively. The backplane connected serial inputs and outputs have 128 and 256 64kb/s channels per frame with data rates of 8.192 and 16.384Mb/s respectively.

Features
• 3.3V operation with 5V tolerant inputs and I/O’s
• 2,432 x 2,432 channel non-blocking switching among local streams
• 4,096 x 2,432 channel blocking switching between backplane and local streams
• 2,048 x 2,048 channel non-blocking switching among backplane streams
• Rate conversion between backplane and local streams
• Rate conversion among local streams
• Backplane interface accepts data rates of 8.192Mb/s or 16.384Mb/s
• Local interface accepts data rates of 2.048Mb/s, 4.096Mb/s or 8.192Mb/s
• Sub-rate switching (2 or 4 bits) configuration for local streams at a data rate of 2.048Mb/s
• Per-channel variable or constant throughput delay
• Fully compliant to H.110 Timing specifications
• Automatic frame offset delay measurement for backplane streams
• Per-stream input frame delay offset, up to 128 bytes, programmable for local streams on a per quarter bit or per channel basis
• Per-stream output frame advancement, programmable for backplane and local streams
• Per-channel direction control for backplane streams
• Per-channel message mode for backplane and local streams
• Per-channel high impedance output control for backplane and local streams
• Pseudo-Random Binary Sequence (PRBS) pattern generation and testing for backplane and local streams
• 5V tolerant PCI driver on CT-Bus I/O’s
• Integrated PLL, compatible to Stratum 4 Enhanced clock switching standard
• Non-multiplexed microprocessor interface
• Connection memory block programming for fast device initialization
• Tristate-control outputs for external drivers
• Conform to the mandatory requirements of the IEEE-1149.1 (JTAG) standard

Applications
• Multi-service access platforms
• CTI applications
• Gateways, Integrated Access Devices
• ST-BUS and H.110 interface applications