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 64 kb/s channels per frame with data rates of 2.048, 4.096 and 8.192 Mb/s respectively. The backplane connected serial inputs and outputs have 128 and 256 64 kb/s channels per frame with data rates of 8.192 and 16.384 Mb/s respectively.

Features
• 2,432 x 2,432 non-blocking switching among local streams
• 4,096 x 2,432 blocking switching between backplane and local streams
• 2,048 x 2,048 non-blocking switching among backplane streams
• Rate conversion between backplane and local streams
• Rate conversion among local streams
• Backplane interface accepts data rates of 8.192 Mb/s or 16.384 Mb/s
• Local interface accepts data rates of 2.048 Mb/s, 4.096 Mb/s or 8.192 Mb/s
• Sub-rate switching (2 or 4 bits) configuration for local streams at a data rate of 2.048 Mb/s
• Meets all the key H.110 mandatory signal requirements including timing
• Per-channel variable or constant throughput delay
• Per-stream input delay, programmable for local streams on a per bit basis
• Per-stream output 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
• Compatible to Stratum 4 Enhanced clock switching standard
    - Integrated PLL conforms to Telcordia GR-1244- CORE Stratum 4 Enhanced switching standard
        - Holdover Mode with holdover frequency stability of 0.07 ppm
        - Jitter attenuation from 1.52 Hz.
        - Time interval error (TIE) correction
        - Master and Slave mode operation
• Non-multiplexed microprocessor interface
• Connection memory block-programming for fast device initialization
• Tristate-control outputs for external drivers
• Pseudo-Random Binary Sequence (PRBS) pattern generation and testing for backplane and local streams
• Conforms to the mandatory requirements of the IEEE-1149.1 (JTAG) standard
• 3.3V operation with 5 V tolerant inputs and I/O’s
• 5 V tolerant PCI driver on CT-Bus I/O’s

Applications
• Carrier-grade VoIP Gateways
• IP-PBX and PABX
• Integrated Access Devices
• Access Servers
• CTI Applications/CompactPCI® Platforms
• H.110, H.100, ST-BUS and proprietary Backplane Applications