Moxa EDS-82810G [22/113] Ieee 1588 ptp
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Moxa EDS-82810G [22/113] Ieee 1588 ptp

Moxa EDS-82810G [22/113] Ieee 1588 ptp
EDS-828 Series Featured Functions
3-9
System Up Time
Indicates the EDS-828’s up time from the last cold start. The unit is seconds.
Time Zone
Setting Description Factory Default
User selectable time
zone
The time zone setting allows conversion from GMT (
Greenwich
Mean Time) to local time.
GMT (Greenwich
Mean Time)
NOTE
Changing the time zone will automatically correct the current time. You should configure the time zone before
setting the time.
Time Server IP/Name
Setting Description Factory Default
1st Time Server
IP/Name
IP or Domain address (e.g., 192.168.1.1 or
time.stdtime.gov.tw or time.nist.gov).
None
2nd Time Server
IP/Name
The EDS-828 will try to locate the 2nd NTP Server if the 1st NTP
Server fails to connect.
Time Server Query Period
Setting Description Factory Default
Query Period This parameter determines how frequently the time is updated
from the NTP server.
600 seconds
IEEE 1588 PTP
The following information is taken from the NIST website at http://ieee1588.nist.gov/intro.htm:
Time measurement can be accomplished using the IEEE Standard for a Precision Clock Synchronization
Protocol for Networked Measurement and Control Systems (IEEE 1588-2008) to synchronize real-time clocks
incorporated within each component of the electrical power system for power automation applications.
IEEE 1588, which was published in November 2002, expands the performance capabilities of Ethernet networks
to control systems that operate over a communication network. In recent years an increasing number of
electrical power systems have been using a more distributed architecture with network technologies that have
less stringent timing specifications. IEEE 1588 generates a master-slave relationship between the clocks, and
enforces the specific timing requirements in such power systems. All devices ultimately get their time from a
clock known as the grandmaster clock. In its basic form, the protocol is intended to be administration free.
How Does an Ethernet Switch Affect 1588 Synchronization?
The following content is taken from the NIST website at http://ieee1588.nist.gov/switch.htm:
An Ethernet switch potentially introduces multi-microsecond fluctuations in the latency between the 1588
grandmaster clock and a 1588 slave clock. Uncorrected these fluctuations will cause synchronization errors.
The magnitude of these fluctuations depend on the design of the Ethernet switch and the details of the
communication traffic. Experiments with prototype implementations of IEEE 1588 indicate that with suitable
care the effect of these fluctuations can be successfully managed. For example, use of appropriate statistics in
the 1588 devices to recognized significant fluctuations and use suitable averaging techniques in the algorithms
controlling the correction of the local 1588 clock will be the good design means to achieve the highest time
accuracy.

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