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3-14 Programming Guide
Remote Data Transfer ESG Family Signal Generators
User File Data Downloads
Data Volatility
Downloaded user file data is nonvolatile. The data is stored to the instrument’s memory
catalog.
This data will survive a line power cycle. It will remain in the memory catalog until you
delete the file, or until the signal generator’s internal battery expires.
User Files as Data Source for Framed Transmission
Specifying a user file as the data source for a framed transmission provides you with an
easy method to multiplex real data into internally generated TDMA framing. The user file
will fill the data fields of the active timeslot in the first frame, and continue to fill the same
timeslot of successive frames as long as there is more data in the file. This functionality
allows a communications system designer to download and modulate proprietary data
sequences, specific PN sequences, or simulate multiframe transmission, such as those
specified by some mobile communications protocols. As the example in the following figure
shows, a GSM multiframe transmission requires 26 frames for speech.
Figure 3-1 GSM Multiframe Transmission
When a user file is selected as the data source for a framed transmission, the signal
generator’s firmware loads pattern RAM with the framing protocol of the active TDMA
format. For all addresses corresponding to active (on) timeslots, burst bits are set to 1 and
data bits are set with the contents of the user file for the data fields of the timeslot. Other
bits are set according to the configuration selected. For inactive (off) timeslots, burst
control bits are set to 0, and data is “unspecified.” Pattern reset is set to 1 for the last byte
in PRAM, causing the pattern to repeat after the last byte is read.
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