The Agilent 70001A system mainframe provides the structural environment for MMS plug-in modules as well as cooling, power, and digital communication interface buses (MSIB and GPIB). It has eight slots available for single or multiple-slot modules. It is compatible with standard EIA racks, and its integral bails and handles make benchtop use easier. The mainframe has good EMC performance and rugged structural design, making it suitable for sensitive measurements in tough industrial environments. The modular system interface bus (MSIB) provides high speed digital communication between MMS instruments, modules, and displays connected in the same system. The MSIB allows simultaneous communication between all modules on the bus. The Agilent interface bus (GPIB) is used to provide computer control and communication between MMS instruments and other GPIB instruments, including VXIbus products.