The distance between SEDs and TMEs or the TBR must be well within the Thread signal range.

The Thread signal range in buildings is between 15 m and 50 m, depending on the individual building conditions.

As a rule of thumb, the Thread radio range between two Thread devices1 is:

Range (R) = 30 m

1 SED to TME / SED; TBR / TME to TME;

On all the calculation and planning steps in this document assume a range (R) = 30 m.


The circles below represent the radio range of the devices. Where the TBR and TME devices are cascaded, the cascading devices must be within each other’s field.


Range (R) = 30 m

Radio/signal range between Thread devices




Wireless range

Wired connection