Creating and Downloading User-Data Files

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

Figure 8-1 GSM Multiframe Transmission

When you select a user file as the data source for a framed transmission, the signal generator’s firmware loads PRAM with the framing protocol of the active TDMA format. This creates a file named AUTOGEN_PRAM_1 in addition to a copy of the user file. For all addresses corresponding to active (on) timeslots, the signal generator sets the burst bit to 1 and fills the data fields with the user file data. Other bits are set according to the configuration selected. For inactive (off) timeslots, the signal generator sets the burst control bit to 0, with the data being unspecified.

In the last byte that contains the last user file data bit, the signal generator sets the Pattern Reset bit to 1. This causes the user file data pattern to repeat in the next frame.

NOTE The data in PRAM is static. Firmware writes to PRAM once for the configuration selected and the hardware reads this data repeatedly. Firmware overwrites the volatile PRAM memory to reflect the desired configuration only when the data source or TDMA format changes.

For example, transmitting a 228- bit user file for timeslot #1 (TS1) in a normal GSM transmission creates two frames. Per the standard, a GSM normal channel is 156.25 bits long, with two 57- bit data fields (114 user data bits total per timeslot), and 42 bits for control or signalling purposes.The user file completely fills timeslot #1 for two consecutive frames, and then repeats. The seven remaining timeslots in the GSM frame are off, as shown in Figure 8- 2

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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.

The E8663B, meanwhile, is designed for the range of 250 kHz to 3 GHz and is also recognized for its high-performance features. Its built-in capabilities for modulation make it effective for testing wireless devices, ensuring that signals can be simulated accurately in both laboratory and field environments. It is especially beneficial for users requiring a straightforward and efficient solution with high reliability.

The N5183A MXG signal generator enhances the lineup with frequency coverage up to 6 GHz and advanced capabilities. It integrates various modulation capabilities while ensuring high signal integrity. Its architecture is tailored for both production test environments and research applications, providing users with the flexibility to adapt to changing testing requirements.

Common characteristics across these models include a user-friendly interface that simplifies configuration and operation. They are often equipped with LAN and USB interfaces for easy remote control and integration into automated test systems. The robustness of these generators allows them to perform reliably in challenging environments, making them essential tools in laboratories, manufacturing floors, and field testing scenarios.

In summary, Agilent's signal generators, including the N5181A, N5182A, E8663B, and N5183A MXG, represent a blend of advanced technology, flexibility, and precision. These instruments are vital in facilitating the evolution of cutting-edge communication technologies, ensuring that designers and engineers can confidently meet the demands of modern electronics.
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