Integrator’s Reference Manual

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The following sections describe how the modem itself would deal with incoming (mobile-terminated) calls. This information is provided for developers who wish to configure their applications for mobile-terminated calls, in preparation for future releases of the Gateway software.

As an alternative to mobile-terminated calls, you can have the modem receive an SMS message, then originate a call back to the host. For details, see Using SMS for Mobile-Terminated Calls on page 5-18.

If your Service Provider supports Caller ID, you can have the modem receive a non-packet-data call, then originate a call back to the host. An incoming non-packet-data call to the DCE would toggle RI and wake up the DTE application, which could decide whether to call back. For example, for security reasons a callback might be allowed only if the Caller ID number is on an approved list. Check with your Service Provider for Caller ID availability.

Answering Calls Using the Data Port Only

The Data port uses both the RI and DTR signals. How the call is answered depends on whether DTR is high or low:

•DP_DTR high (asserted) — the modem will auto-answer.

•DP_DTR low (de-asserted) — the modem will not auto-answer, but your DTE application can decide whether to answer the call by raising DP_DTR. On an incoming call, the modem asserts RI and displays RING to the appropriate port (Data port in this case).

Normally, if the application is using the Data port only and DP_DTR is low, the modem would be powered off. To power on the modem while still leaving DP_DTR low to prevent auto-answering, you can wire the DTR pin high on the Diagnostic port, instead of on the Data port.

The scenario could work like this:

•DMP_DTR is high (asserted), powering the modem on.

•RI on the Data port asserts.

•DP_DTR is low (de-asserted), meaning the modem will not auto-answer.

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Qualcomm GSP-1620 specifications Answering Calls Using the Data Port Only, Integrator’s Reference Manual Tip
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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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