GE D30 Instruction Manual page 321

CHAPTER 5: SETTINGS
5.3.7.3 SNTP protocol
SETTINGS  PRODUCT SETUP  REAL TIME CLOCK  SNTP PROTOCOL
 SNTP PROTOCOL

The D30 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the D30 can obtain clock time over
an Ethernet network. The D30 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a dedicated
product using a GPS receiver. UR family relays support unicast, broadcast, multicast, and anycast SNTP functionality.
The setting enables or disables the SNTP feature on the D30.
SNTP FUNCTION
To use SNTP in unicast mode, set
is "Enabled," the D30 attempts to obtain time values from the SNTP/NTP server. Since many time values are
FUNCTION
obtained and averaged, it generally takes three to four minutes until the D30 clock is closely synchronized with the SNTP/
NTP server. It takes up to two minutes for the D30 to signal an SNTP self-test error if the server is offline.
To use SNTP in broadcast mode, set the
then listens to SNTP messages sent to the "all ones" broadcast address for the subnet. The D30 waits up to 18 minutes
(>1024 seconds) without receiving an SNTP broadcast message before signaling an SNTP self-test error.
The is 123 for normal SNTP operation. The change takes effect when the D30 is restarted.
SNTP UDP PORT NUMBER
After enabling and waiting for the synchronization, verify that there is no SNTP Failure message in the Event Records.
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
5.3.7.4 Local time
SETTINGS  PRODUCT SETUP  REAL TIME CLOCK  LOCAL TIME
 LOCAL TIME

D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
SNTP FUNCTION:

Disabled
SNTP SERVER IP ADDR:

0.0.0.0
SNTP UDP PORT

NUMBER: 123
to the SNTP/NTP server IP address. Once this address is set and
SNTP SERVER IP ADDR
setting to "0.0.0.0" and
SNTP SERVER IP ADDR
LOCAL TIME OFFSET

FROM UTC: 0.0 hr
DAYLIGHT SAVINGS

TIME: Disabled
DST START MONTH:

January
DST START DAY:

Sunday
DST START DAY

INSTANCE: First
DST START HOUR:

2:00
DST STOP MONTH:

January
DST STOP DAY:

Sunday
DST STOP DAY

INSTANCE: First
DST STOP HOUR:

2:00
Range: Enabled, Disabled
Range: standard IP address format
Range: 1 to 65535 in steps of 1
to "Enabled." The D30
SNTP FUNCTION
Range: –24.0 to 24.0 hr in steps of 0.5
Range: Disabled, Enabled
Range: January to December (all months)
Range: Sunday to Saturday (all days of the week)
Range: First, Second, Third, Fourth, Last
Range: 0:00 to 23:00 in steps of one hour
Range: January to December (all months)
Range: Sunday to Saturday (all days of the week)
Range: First, Second, Third, Fourth, Last
Range: 0:00 to 23:00 in steps of one hour
PRODUCT SETUP
SNTP
5
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