TriComm '92 was the fifth in the series of Research Triangle conferences on Computer Communications. This series emerged from a need to provide a forum for the people who are actively involved in Research and Development in the Research Triangle area in which they could present and discuss new ideas in Computer Communications. TriComm '92 was dedicated to High Speed networks. In particular, the program was developed around the following themes: local ATM, preventive and reactive congestion control. routing. transport protocols. traffic measurements, software engineering for telecommunication systems. and standards. I would like to thank all the speakers who agreed to present a paper. and the members of the program committee who patiently refereed the papers despite their busy schedules. I would also like to thank Mr. Ed Bowen, IBM, Research Triangle Park, for covering the expenses for the preparation of the pre-conference proceedings. and Dr. Raif Onvural. IBM, Research Triangle Park, for overseeing the photocopying of the proceedings. I would also like to thank my "e;Guardian Angel"e; Ms. Margaret Hudacko. Center for Communications and Signal Processing. State University, who made all the local arrangements. North Carolina Without her help, this conference would have been a complete disaster. Many thanks also go to Norene Miller. Center for Communications and Signal Processing. North Carolina State University. Finally. I would like to thank Mr. Charles Lord, Eastern NC Chapter of the IEEE Communications SOCiety. for providing us with mailing lists.