What is the expected transfer rate over the U2781A USB Modular Instrument Chassis?

The U2781A USB Modular Instrument Chassis uses the USB 2.0 Hi-Speed standard. Therefore, you are able to do data generation and acquisition at a faster rate than with the USB 1.0/1.1. The transfer rate of the U2781 is dependent on the type of USB Data Acquisition (DAQ) Modules installed and the number of channel counts in the task.

For example, for each U2331A module with 1 channel, the sampling rate is 3 MSa/s, which is equivalent to 48 Mbits/s (3 M x 2 bytes x 8 Bits). Each sample is 2 bytes. Therefore, for six modules of U2331A DAQ in a U2781A chassis, the total transfer rate will reach 288 Mbit/s. And with the USB 2.0 capability the transfer rate is able to achieve up to 480 Mbits/s.

However, the actual transfer rate is also affected by factors like the PC's performance, the PC's operating system, the bus transfer rate, the number of USB devices with high interruption, etc.