This paper presents the design details and performance measurements of an implementation of the Cells In Frame (CIF) protocol over the Linux operative system. The CIF protocol allows to encapsulate ATM cells in Ethernet frames, bringing in this way the advantages of ATM technology over legacy Ethernet networks. Throughput, delay, and delay variation have been measured in order to determine the ability of this approach to suite properly the requirements of multimedia traffic. The obtained results point out that this scheme will provide the necessary ATM quality of service at the price of a minimum throughput reduction respect to native Ethernet. Also, a new queuing algorithm is been researched to optimize traffic management.