https://devzone.nordicsemi.com/f/nordic-q-a/89079/52840-long-range-mode-real-transmit-speed-and-distanceHi, Our customer use 52840 transmit voice data, they use long range mode , the actual speed is 50-60Kbit/s in 10m distace. but when the distance is more than 50m, the speed would decline to 5-6kbit/s. is it normal? or some software or hardware configurateen-USTelligent Community 13Fri, 17 Jun 2022 13:09:27 GMThttps://devzone.nordicsemi.com/thread/373048?ContentTypeID=1Fri, 17 Jun 2022 13:09:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a8638a98-0d9b-45ca-b637-165f0a4e37e6Einar Thorsrud<p>Hi,</p> <p>It is difficult to say exactly what is normal and what is not, as the range is effected by a number of factors. However, it is expected that as the range increased you will see more and more packet loss leading to a reduction in throughput. Note that 125 kbps is the speed on the link layer. You can never (not even theoretically) achieve a data throughput this high. A practical maximum speed of 60 kbps is reasonable.</p> <p>Regarding retransmissions, Bluetooth 5.2 introduced a few new features indented for LE Audio, which can also be relevant for other use cases where you do not want retransmissions,&nbsp;broadcast isochronous streams (BIS) which are connectionless.&nbsp;We do not support that with long range / coded PHY though as LE Audio requiers 1 or 2 Mbps, but in principle connectionless communication should be possible also with coded PHY (if/when the stack supports it).</p> <p>Br,</p> <p>Einar</p><div style="clear:both;"></div>