> 3.18.1 | Synchronization Signal

> The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal is generated by the SYNC pin. Please note that this pin can adopt three different operating modes which you can select by using the AT^SSYNC command: the mode AT^SSYNC=0 described below, and the two LED modes AT^SSYNC=1 or AT^SSYNC=2 described in [1] and Section 3.18.2.
> The first function (factory default AT^SSYNC=0) is recommended if you want your application to use the synchronization signal for better power supply control. Your platform design must be such that the incoming signal accommodates sufficient power supply to the TC65 module if required. This can be achieved by lowering the current drawn from other components installed in your application.
> The timing of the synchronization signal is shown below. High level of the SYNC pin indicates increased power consumption during transmission.
> Figure 36: SYNC signal during transmit burst
> *) The duration of the SYNC signal is always equal, no matter whether the traffic or the access burst are active.