family do not need to be connected to an external PC for operation. The Embedded Series is designed for applications that require stand-alone operation. Discontinued models The USRP2 was developed after the USRP and was first made available in September 2008. It has reached end of life and has been replaced by the USRP N200 and USRP N210. The USRP2 was not intended to replace the original USRP, which continued to be sold in parallel to the USRP2. This first generation USRP is also no longer available publicly. The E100 series of embedded USRPs is no longer available. Daughterboard modules The original USRP, USRP2, USRP E1xx, USRP N2xx and X3xx families feature a modular architecture with interchangeable daughterboard modules that serve as the RF front end. Several classes of daughterboard modules exist: Receivers, Transmitters and Transceivers. Transmitter daughterboard modules can modulate an output signal to a higher frequency Receiver daughterboard modules can acquire an RF signal and convert it to baseband Transceiver daughterboard modules combine the functionality of a Transmitter and Receiver. The USRP B2xx and E3xx do not feature exchangeable daughterboards. The N3xx series has a JESD204B-attached daughterboard featuring the AD9371 frontend, but currently, no alternative daughterboards are commercially available. See also List of software-defined radios References External links Ettus Research LLC UHD Documentation and manual GNU Radio wiki Wired article on the USRP platform Firas's USRP platform documentation Software-defined radio Open hardware electronic devices Amateur radio