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"Using say to verify speed You can generally expect only 50% of the channel speed for DL and less for UL, as it is a half duplex link."

what is meant by saying half duplex. I know the channel is full there any more detail

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Half duplex means that the channel can only be used in one direction(down or up) at a given time. It is often referred to as a shared channel. If the channel is full duplex you can ignore the comment about half duplex. A channel can only be half or full, but a full duplex can be configured to operate at half duplex though it degrades performance.

Wikipedia has more details if you are interested: Wikipedia Half Duplex

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