The E1619B 25.6 Mb/s Line Interface generates and analyses ATM cell streams contained within a 25.6 Mb/s (4B/5B) framing format as per the standard defined by the Desktop ATM25 Alliance. It is a single-slot module that provides test capability at the physical and ATM cell layers for the Agilent E4200/E4210 Broadband Series Test System.