<html><head><title> A Kernel Programming Interface for Precision Time Signals Network Performance Evaluation </title></head><body><h3> A Kernel Programming Interface for Precision Time Signals </h3><hr> <p>The technical memorandum: <cite>A Kernel Programming Interface for Precision Time Signals</cite><a href="http://www.eecis.udel.edu/~mills/database/memos/memo96c.ps"> (PostScript) </a> describes a proposed programming interface for external precision time signals, such as the pulse-per-second (PPS) signal generated by some radio clocks and cesium oscillators. <p>The memorandum argues for a generic capability in the ubiquitous Unix kernel, which could be used for a wide variety of measurement applications, including network time synchronization and experiments involving performance measurement and evaluation of computer networks and transmission systems. The hardware to do this requires only a serial port and a modem control lead, such as the data carrier detect (DCD) lead, which can be driven by an external source via a level converter/pulse generator. <hr><a href=index.htm><img align=left src=pic/home.gif></a><address><a href=mailto:mills@udel.edu> David L. Mills <mills@udel.edu></a> </address></a></body></html>