In 2008, the NSA began collecting what it called upstream communications, essentially information that travels across the Internet, separate from the what it receives from Internet service providers that filter data to respond to agency requests.n 2008, the NSA began collecting what it called upstream communications, essentially information that travels across the Internet, separate from the what it receives from Internet service providers that filter data to respond to agency requests.
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Serial Peripheral Interface (SPI) Introduction. Serial Peripheral Interface (SPI) is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and SD cards. It uses separate clock and data lines, along with a select line to choose the device you wish to talk to.