atm vsThis page compares ATM and TDM and mentions the difference between ATM and TDM. As we know, ATM stands for Asynchronous Transfer Mode, and TDM stands for Time DivisionIn Australia and Europe, the ATM and the GTM can be the same number. 3500kg at GTM is not the weth but a measurement of D-value. Payload Capacity. Payload is the trailer’s carrying