+--------------------------------------------------------------------------------------------------+ | MINITEL ADF-258 WI-FI MODEM - COMPATIBILITY NOTES RELATED TO VIDEOTEL/SIP "TTM90/TL" | +--------------------------------------------------------------------------------------------------+ ADDITIONAL NOTES ---------------- This ADF-258 WI-FI MODEM (PCB Version 1.00) can be made compatible with VIDEOTEL/SIP "TTM90/TL" with a simple modification. Before using the modem with VIDEOTEL/SIP "TTM90/TL" please perform the following operation: 1) Carefully disconnect the ESP-32 Dev Board from the PCB, taking note of the orientation. 2) Identify the jumper "POWER". It can have either a soldered jumper wire or a proper jumper. Usually it connects the central pin and the "LD1117" side. 3) Cut/open the existing connection: the three pads must remain unconnected. 4) Check the orientation of the ESP-32 Dev Board and gently put it back in place. From now on the modem can be powered only by the USB connector. ---------------------------------------------------------------- Reconnect the modem to the VIDEOTEL/SIP "TTM90/TL" and switch it on. Connect the USB cable to an appropriate power supply and continue the start-up sequence as usual.