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Appendix A: IEEE-1588 Glossary of Terms Series 3700 System Switch/Multimeter Reference Manual
A-2 3700S-901-01 Rev. C / July 2008
Master clock
Within a region (on the same subnetwork), the master clock is the clock that
serves as a primary source of time.
Definition derived from NIST website (http://ieee1588.nist.gov).
PTP
Precision Time Protocol, synonymous with IEEE-1588.
Definition derived from NIST website (http://ieee1588.nist.gov).
PTP port
A PTP port is the logical access point for IEEE-1588 communications to the
clock containing the port.
Definition derived from NIST website (http://ieee1588.nist.gov).
PTP subdomain
A logical grouping of 1588 clocks that synchronize to each other using PTP
protocol but are not necessarily synchronized to PTP clocks in another
subdomain. Allows a single common network with independent groups of
synchronized devices.
Definition derived from NIST website (http://ieee1588.nist.gov).