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Environment/Versions SimGEN It is not necessary to have the GSS4150 LAAS signal generator to get the LAAS data stream. The GSS4150 is required for an RF output. Please contact support@spirent.com for further information on this feature. Answer The LAAS output is streamed to the defined COM port and output there using the RS232 (RS-232) protocol. The datastream is also saved locally in the file called rsdata.dat The bit-stream data file of the data transmitted on the RS232 output port, a 256-byte block for each frame. The bit-stream starts with the first bit of the first Message Block Header and ends with the last bit of the last Message Block CRC. This file does not have the Training Sequence or Application FEC bits and is not ‘bit scrambled’. For further detail please refer to the SimGEN Software User Manual found in the "C:\Program Files\Spirent Communications\Positioning Application\Docs" location