User`s manual

TN-5516/5518 Series Featured Functions
3-10
Daylight Saving Time
The Daylight Saving Time settings are used to automatically offset the TN-5500’s time forward according to
national standards.
Start Date
Setting Description Factory Default
User-specified date This specifies the date that Daylight Savings Time begins. None
End Date
Setting Description Factory Default
User-specified date This specifies the date that Daylight Savings Time ends. None
Offset
Setting Description Factory Default
User-specified hour This specifies the number of hours that the time should be
offset forward during Daylight Savings Time.
None
System Up Time
This indicates how long the TN-5500 remained up since the last cold start. The up time is indicated in seconds.
Time Zone
Setting Description Factory Default
Time zone This specifies the time zone, which is used to determine the
local time offset from GMT (Greenwich Mean Time).
GMT (Greenwich
Mean Time)
NOTE Changing the time zone will automatically correct the current time. Make sure to set the time zone before
setting the time.
Time Server IP/Name
Setting Description Factory Default
IP address or name of
time server
This is the IP or domain address (e.g., 192.168.1.1,
time.stdtime.gov.tw, or time.nist.gov).
IP address or name of
secondary time server
The TN-5500 will try to locate the secondary NTP server if the
first NTP server fails to connect.
None
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
Enable NTP/SNTP Server
Setting Description Factory Default
Enable/Disable This enables or disables NTP or SNTP server. Disable
Configuring IEEE 1588/PTP
Time may 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 in power automation applications.
IEEE 1588, published in November 2002, is a new technology that expands the performance capabilities of
Ethernet networks for measurement and control over a communication network. In recent years, an increasing
number of electrical power systems have been utilizing a more distributed architecture and less stringent
timing specifications. IEEE 1588 establishes a master-slave relationship between the clocks, and enforces the