Symmetricom XLi IEEE 1588 - Manual (Page 207)

XLi IEEE 1588 Clock 199
997-01510-03, Rev. C, 12/12/2006
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Glossary of IEEE 1588-related Terms
Boundary Clock: Generally a switch with more than a single IEEE 1588 equipped port, which is a slave
on one port and a master on all others.
Grandmaster Clock: Within an IEEE 1588 subdomain, a Grandmaster clock is the ultimate source of
time for clock synchronization using the IEEE 1588 protocol.
IEEE 1588 Ordinary Clock: A IEEE 1588 clock with a single port. Precision Time Protocol (PTP): The
protocol defined by the IEEE 1588 standard.
Transparent Clock: In IEEE 1588 terminology, it is a switch that compensates for its own queuing
delays. Neither master or slave.