GE IS220PAOCH1A | 336A4904CSP5 | Speedtronic Mark VIe | Analog IN/Out I/O Pack.The IS220PAOCH1A is a Mark VIe I/O pack. One or more I/O pack modules digitize the sensor signal and feed it to the controller. Every I/O pack has Dual 100MB full-duplex Ethernet Ports. This is mostly used with the GE Speedtronic Mark VIe series. In addition, the Mark VIe is a flexible platform for multiple applications. It also provides high-speed networked I/O for simplex, dual, and triple-redundant systems.IS220PAOCH1A is a multiple PCB module with multilayer PCB populated with SMD components. Numerous versions of this I/O pack are available also.