ATM in German

I am talking about Asynchronous Transfer Mode, not Automatic Teller Machine. Just wonder how to write the term, ATM in German. Taking the German class for almost 3 months already. But yet to feel confident to speak to German-speaking ppls. If one person speaks to me in German, I am only able to reply with these two sentences

"Ich verstehe nicht !"
"Noch einmal, bitte langsam"

Not so bad... ATM in German -- Asynchroner Transfer Mode. Look similar to English!! No, not English, I think that my German teacher will probably correct me and emphasize that "ATM" is an International word, not belonging to English (Englisch). Same as "Computer", it is also an International word. Nobody can claim that this word is originated from their language. Sound interesting..