Network Working Group Robert Kahn RFC-29 BBN 19 January 1970
This 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 the order of tens to hundreds of milliseconds. The IMP contains a 16-bit hardware clock which is incremented every 100 microseconds to allow for timing 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, MIT S . Carr. Utah G . Cole, SDS S . Crocker, UCLA K . Fry, MITRE J . Heafner, RAND B . Kahn, BBN T . O'Sullivan, Raytheon L . Roberts, ARPA P . Rovner, LL R . Stoughton, UCSB