Intended for large control and data acquisition applications, NAT-MCH-PHYS80 addresses requirements for high bandwidth to both AMCs and rear transition slot of MCH as well as for optical and copper uplinks in PCIe-based MTCA.4 systems. Board provides PCIe bandwidth of 128 Gbps to local main CPU; supports cascading of MicroTCA.4 systems to increase number of PCIexpress slots to 24, 36, 48, etc; and provides external PCIexpress access via 128 Gbps optical or copper uplinks.