HDR, or High Data Rate, is a term used to describe a communication system that can transmit data at high speeds. HDR systems are designed for applications that require high data rates, such as video conferencing and streaming video. There are two main types of HDR systems: those that use multiplexing and those that do not. Multiplexing allows multiple users to share the same physical link by dividing the link into time slots or frequency channels. Non-multiplexed systems allocate a dedicated link to each user.

HDR systems have several advantages over other communication systems. They can provide higher data rates, which means more information can be transmitted in a given amount of time. Additionally, they can support more users than other system types because of their ability to multiplex signals. Finally, HDR systems tend to be more reliable than other system types because they are designed for applications that require high data rates and thus have built-in redundancy mechanisms.

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