Symmetricom XLi IEEE 1588 User Manual

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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.