The MT90863 Rate Conversion Switch provides switching capacities of 2,048 x 512 channels between backplane and local streams, and 512 x 512 channels for local streams. The connected serial inputs and outputs may have 32, 64 and 128 64kb/s channels per frame with data rates of 2.048Mb/s, 4.096Mb/s and 8.192Mb/s respectively. The MT90863 also offers a sub-rate switching configuration which allows 2-bit wide 16kb/s data channels to be switched within the device. The device has features (such as: message mode; input and output offset delay; direction control; and, high