Developing Modem Applications

•Your DTE application decides to answer the call by asserting DP_DTR.

Different operating systems handle the DTR-DCD handshake differently. To configure it appropriately, you can use the AT&D and AT&C commands.

For more information, see DTE Data Terminal Ready

Behavior (&D) on page 6-16 and DCE Received Line Signal

Detector Behavior (&C) on page 6-16.

Answering Calls Using the Data and Control Ports

If your DTE application is using both the Data and Control ports, how the call is answered depends on whether DTR is high (asserted) or low (de-asserted) on the two ports:

•DP_DTR asserted — the modem will auto-answer.

•DP_DTR de-asserted but CP_DTR asserted — the modem will not auto-answer, but your DTE application can decide whether to monitor RI and answer calls by raising DP_DTR. On an incoming call, the modem asserts RI on the Data port and displays RING to the Control port.

In this scenario, keeping DTR high on the Control port powers the modem, while allowing you to leave DP_DTR low to prevent auto-answering.

Roaming and Packet Data Service

The GSP-1620 modem is capable of both “fixed” operation in one location (for example, a building, tank, pipeline, or well) or “mobile” operation for applications on trucks, rail cars, aircraft, or shipping containers.

For packet data service, roaming operation has the following characteristics:

•Roaming within a Gateway service area can keep the PPP session up the entire time, using dormant mode.

•Roaming between Gateway service areas is supported. However, there is no hard hand-off capability between

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Qualcomm GSP-1620 specifications Roaming and Packet Data Service, Answering Calls Using the Data and Control Ports
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GSP-1620 specifications

Qualcomm GSP-1620 is a powerful, cutting-edge SoC (System on Chip) that is tailored for the demands of modern mobile and embedded applications. Designed to deliver high performance, energy efficiency, and advanced connectivity, the GSP-1620 stands out in the competitive landscape of processor solutions.

One of the main features of the GSP-1620 is its multi-core architecture, which facilitates simultaneous processing of multiple tasks. This architecture ensures enhanced multitasking capabilities, allowing devices to run complex applications smoothly without compromising performance. The GSP-1620 integrates Qualcomm's latest Kryo CPU technology, which optimizes performance while maintaining lower power consumption.

The GSP-1620 excels in graphics performance, powered by Adreno GPU technology. This integration enables rich visual experiences, making it ideal for gaming, augmented reality, and immersive multimedia applications. The GPU's capabilities allow for high frame rates and stunning graphics, ensuring that users enjoy a premium visual experience.

In terms of connectivity, the GSP-1620 supports advanced wireless technologies, including 5G, Wi-Fi 6, and Bluetooth 5. With these capabilities, users can expect ultra-fast data speeds, low latency, and improved networking performance. The integration of Qualcomm’s Snapdragon X55 modem enhances the SoC's capability to deliver seamless connectivity in various environments, whether indoors or outdoors.

Moreover, the GSP-1620 features cutting-edge AI and machine learning capabilities, enabled by Qualcomm’s Hexagon DSP technology. This allows for efficient processing of AI tasks, supporting functionalities such as voice recognition, image processing, and real-time translation. It makes the GSP-1620 suitable for applications in smart devices, automotive solutions, and industrial IoT.

Security is a priority in the design of the GSP-1620. The SoC incorporates hardware-based security features that protect sensitive data and applications, ensuring robust defense against cyber threats. This is vital for applications requiring high levels of security, such as mobile payments and confidential communications.

Lastly, the GSP-1620 is designed with scalability in mind. Its modular architecture allows manufacturers to customize the chipset according to specific needs, making it a versatile solution for a broad range of devices, from smartphones and tablets to wearables and embedded systems.

In summary, Qualcomm GSP-1620 combines high-performance processing, advanced graphics capabilities, sophisticated connectivity options, AI support, and robust security features. With these characteristics, it sets a new standard for mobile and embedded platforms, driving innovation in a variety of industries.
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