The XR-T5794 demo board is a 4.75" x 9.75" double-sided circuit card that provides the support circuitry necessary for a comprhensive evaluation of the XR-T5794 CMOS Quad E1 Line Interface IC. three board-mounted DIP switches allow complete testing of all loop back, monitor, and transmitter power-down features. The demo board is normally supplied configured for 120W balanced E1 operation. However, the information contianed in this manual enables the user to modify the hardware for E1 unbalanced 75W cable service, or T1 balanced 100W use.