Links:
www.atmforum.org (note: ATM specifications can be accessed without
charge)
Books:
there are several books on ATM and Broadband ISDN; some may contain errors
(so be careful …)
Web material (important for AAL2):
www.gdc.com/inotes/pdf/aal2tut.pdf
casal.upc.es/~ieee/looking/noguera/aal2.html
www.ericsson.com/about/telecom
(the course book)