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Network Working Group                                   Robert KahnRFC-29                                                  BBN                                                        19 January 1970This note is in response to Bill English's Request for Comments:  28.A "millisecond" clock should be satisfactory for most network measurements.Round-trip message transit times typically should be at least on theorder of tens to hundreds of milliseconds.  The IMP contains a 16-bithardware clock which is incremented every 100 microseconds to allow fortiming of internal events within the IMP, as for example, during tracing.However, most measurements are made using a 25.6 ms. software clock.DISTRIBUTION:A. Bhushan, MITS. Carr. UtahG. Cole, SDSS. Crocker, UCLAK. Fry, MITREJ. Heafner, RANDB. Kahn, BBNT. O'Sullivan, RaytheonL. Roberts, ARPAP. Rovner, LLR. Stoughton, UCSB