The HP Agilent E4205A 155 Mb/s Electrical UTP-5 Line Interface generates and analyses ATM cell streams contained within a SONET or SDH framing format. It is a single-slot VXI module that provides test capability at the physical and ATM cell layers for the E4200/E4210 Broadband Series Test System. The HP Agilent E4205A is capable of operating in both a cell mode and in a SONET/SDH frame mode. This allows the user to not only examine ATM cells mapped into a SONET/SDH frame but also all of the SONET/SDH frame data. Internal traffic generator has 1 foreground channel and up to 100 background channels.