EDS-510A Series User’s Manual
Featured Functions
3-12
Can Ethernet switches be designed to avoid the effects of these
fluctuations?
A switch may be designed to support IEEE 1588 while avoiding the effects of queuing. In this case
two modifications to the usual design of an Ethernet switch are necessary:
The
Boundary Clock
functionality defined by IEEE 1588 must be implemented in the switch,
and
The switch must be configured such that it does not pass IEEE 1588 message traffic using the
normal communication mechanisms of the switch.
Such an Ethernet switch will synchronize clocks directly connected to one of its ports to the
highest possible accuracy.
S
S
S
M
S
M
M
M
Grandmaster
Clock:
Determines the
time base for the
system
Boundary Clock:
Slave to the
grandmaster clock
and master to its
slave
Ordinary Clock:
Slave to its master
