The VSC9182 is a 64x64 STS-12/STM4 Time Slot Interchange Switch IC. A single device provides 40G of nonblocking STS-1 connectivity (768x768 STS-1) with support for concatenated tributaries. All STS-12/STM-4 inputs and outputs are differential serial signals running at 622 Mb/s for efficiency in switch card and system backplane design. Backplane BER monitoring and deskew are integrated, and the connection matrix can be hitlessly reconfigured. Path AIS or UNEQ can be optionally inserted into all 768 outgoing STS-1 tributaries. A standard asynchronous CPU interface with event interrupts is also supported.