There are a variety of long distance types of circuits that can be used for data communication. This paper describes an experiment which optimizes the simultaneous use of terrestrial and satellite circuits in a TCP/IP network. Traditionally, there have been problems effectively using the full capacity of high bandwidth satellite circuits, due to long round trip times coupled with TCP window-size limitations. The experiment significantly reduced the problem, and the result was effective use of all the available bandwidth of a satellite circuit for a single data transfer. This experiment also demonstrates the use of multiple T1 communication lines, and type of service networking over these lines.