This document provides an explanation of the differences between the DS26303, an 8-channel, short-haul line interface unit (LIU) that supports E1/T1/J1 from a single 3.3V power supply, and the IDT82V2048. Emphasis is placed on the information required to use the DS26303 in an existing IDT82V2048 application. Descriptions of the Feature Differences, Register Considerations, and Hardware Considerations are provided.