Ethernet-controlled mainframes offer a modular and scalable platform for building custom test and data acquisition systems. These chassis accept a variety of plug-in instrument cards, allowing you to create a high-density, mixed-signal system tailored to your specific needs. Managed entirely over a standard ethernet connection, they provide a flexible alternative to traditional card-cage systems like PXI, perfect for building distributed measurement nodes or easily reconfigurable benchtop setups. This approach combines the customization of modular instruments with the simplicity and accessibility of network control.