The real-time streaming nature of the technology presents some very difficult challenges to implementing a fully robust HD Radio architecture. The E2X protocol itself is sound and works as intended if implemented properly. It requires a very high degree of accuracy and reliability in order for the HD Radio system to function properly, while relying purely on the physical link layer to provide that reliability. E2X protocol as it stands today may be used reliably, if best practices in network engineering are followed. 1. Providing sufficient link bandwidth overhead with low jitter and latency is critical. 2. Providing for proper system synchronization is also critical. GPS synchronization of the Exporter and Exciter should be considered as the first, best choice. 3. Restricting extraneous traffic through network segmentation and proper switch configuration is essential. The HD Radio system must be on its own subnet. 4. Use TCP/IP as the transport protocol of choice for the E2X link if this is option is available. Many improvements have been made, particularly with the implementations of TCP, and HDP. Development will continue in the areas of synchronization and data loss mitigation.
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