All models in the TNA-300 product family contain a half duplex radio that implements TDD - meaning it employs time division to split between TX and RX operations. Half duplex radios have inherently higher latency compared to FDD radios because of the need to switch back and forth between TX and RX.
The advantage of TDD radios, on the other hand, is that they allow for better channel allocation since TX and RX capacities can be asymmetric. This is typically the case with almost all practical applications such as providing internet (higher download compared to upload) or IP video connections (higher upload compared to download).
The TNA-300 series radios have been optimized to minimize latency and jitter. An idle link will typically experience around 3-4ms of round trip latency when pinging between 2 hosts connected on either side. This latency will remain in this range until link saturation is reached. The below example shows the round trip ping times on a link that is passing 1Gbps duplex (2Gbps total traffic):
As shown in the image, despite the increased loading of the link, ping times remain fairly flat and consistently low (with low jitter).