atm vsThe difference between ATM and GTM – 200kg in this case – is the amount being supported by the jockey wheel or towbar of the tow vehicle, otherwise known as ball weht. Therefore, payload capacity of a trailer isATM vs. Gabit Ethernet For Hh Speed LANS CS533A-Introduction to Networking 4 1. Glossary ATM: Asynchronous transfer mode, a comprehensive connection-oriented transmission