Creating and Downloading User-Data Files

User File Data (Bit/Binary) Downloads (E4438C and E8267D)

AUTOGEN_PRAM_1 file size. If you select different user files for the timeslots within a frame, the user file that produces the largest number of frames determines the size of the AUTOGEN_PRAM_1 file.

Use this procedure to calculate the volatile memory usage for a GSM signal with two active timeslots and two user binary files. One user file, 57 bytes, is for a normal timeslot and another, 37 bytes, is for a custom timeslot.

1.Determine the total number of bits per timeslot.

A GSM timeslot consists of 156.25 bits (control and payload data).

2.Calculate the number of bits per frame.

A GSM frame consists of 8 timeslots: 8 ⋅ 156.25 = 1250 bits per frame

3.Determine how many bytes it takes to produce one frame in the signal generator:

The signal generator creates a 32- bit word for each bit in the frame (1 bit equals 4 bytes).

4 x 1250 = 5000 bytes

Each GSM frame uses 5000 bytes of PRAM memory.

4.Analyze how many timeslots the user file data will fill.

A normal GSM timeslot (TS) uses 114 payload data bits, and a custom timeslot uses 148 payload data bits. The user file (payload data) for the normal timeslot contains 57 bytes (456 bits) and the user file for the custom timeslot contains 37 bytes (296 bits).

Normal TS

456 / 114 = 4 timeslots

Custom TS

296 / 148 = 2 timeslots

NOTE Because there is an even number of bytes, either a bit or binary file works in this scenario. If there was an uneven number of bytes, a bit file would be the best choice to avoid data discontinuity.

5.Compute the number of frames that the signal generator will generate.

There is enough user file data for four normal timeslots and two custom timeslots, so the signal generator will generate four frames of data.

6.Calculate the AUTOGEN_PRAM_1 file size:

Number of Frames Bytes per Frame

4

5000

4 x 5000 = 20000 bytes

7.Calculate the number of memory blocks that the AUTOGEN_PRAM_1 file will occupy: Volatile memory allocates memory in blocks of 1024 bytes.

20000 / 1024 = 19.5 blocks

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

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Agilent Technologies N5181A/82A, N5183A MXG, E8663B manual Number of Frames Bytes per Frame

N5183A, N5183A MXG, E8663B, N5181A/82A specifications

Agilent Technologies is renowned for its innovative solutions in electronic test and measurement equipment. Among its offerings are several signal generators including the N5181A, N5182A, E8663B, and N5183A MXG. These models are distinguished not only by their performance but also by their versatility across various applications in communications, aerospace, and electronics.

The Agilent N5181A and N5182A, part of the MXG family, are highly versatile signal generators known for their exceptional frequency performance and flexibility. The N5181A operates from 100 kHz to 6 GHz, while the N5182A extends that range up to 12 GHz. They provide high fidelity signals with low phase noise, making them ideal for the development and testing of RF components and systems. These generators support a wide variety of modulation formats, including AM, FM, PM, and pulse modulation, catering to diverse application needs.

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