Both models feature Ethernet and Serial remote control with a command set that is script friendly.
Model 50PA-1183-XX contains up to 8 attenuators and has a 19 inch rack mount chassis. If you order this model with 4 attenuators for your current testing needs, it can be later expanded to have up to a maximum of 8 attenuators.
Model 50BA-048-95 contains 2 attenuators and has a benchtop enclosure. This model also displays the current attenuation of both attenuators. If the attenuation is changed remotely, then the dB values shown on the front panel will update accordingly. The two manual levers on the front panel allow for quick and easy manual control of both attenuators.