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