S140 Coded PHY att_mtu_throughput example

[hkartadi]

Hi,

I have 2 nRF512840 eval kits and tried out the att_mtu_throughput example provided on SDK 13.0. The throughput about 900-1000Kbps can be achieved with PHY 2.0 DLE 251 and MTU 247.

When I tried out the PHY coded, I found out the result of the throughput and time to finish is the same with or without Data Length Extension enabled. Below is the result:

MTU_Size Conn_Interval Data_Length_Extension PHY Throughput(Kbps) Time (s)

23 7.5 OFF (27) 125Kbps 21.4 391.813

158 7.5 OFF (27) 125Kbps 26.98 310.885

247 7.5 OFF (27) 125Kbps 26.17 320.525

23 7.5 ON (251) 125Kbps 21.39 392.21

158 7.5 ON (251) 125Kbps 27 310.712

247 7.5 ON (251) 125Kbps 26.17 320.584

Does the DLE disregard in Coded PHY? Is this the result we should expect with or without DLE on Coded PHY?

Thanks

Handi

[FormerMember]

Your observations are correct, the maximum PDU payload size for coded PHY is 27 bytes in the latest version of the softdevice, S140 v.5.0.0-3.alpha, see the softdevice release notes: