GE L30 Instruction Manual page 208

5.2 PRODUCT SETUP
c) SNTP PROTOCOL

PATH: SETTINGS PRODUCT SETUP
 SNTP PROTOCOL

The L30 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the L30 can obtain clock time over
an Ethernet network. The L30 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a dedicated
product using a GPS receiver to provide an accurate time. UR series relays support unicast, broadcast, multicast, and any-
cast SNTP functionality.
The setting enables or disabled the SNTP feature on the L30.
SNTP FUNCTION
To use SNTP in unicast mode,
set and
SNTP FUNCTION
values are obtained and averaged, it generally takes three to four minutes until the L30 clock is closely synchronized with
the SNTP/NTP server. It takes up to two minutes for the L30 to signal an SNTP self-test error if the server is offline.
To use SNTP in broadcast mode, set the
L30 then listens to SNTP messages sent to the "all ones" broadcast address for the subnet. The L30 waits up to 18 minutes
(>1024 seconds) without receiving an SNTP broadcast message before signaling an SNTP self-test error.
5 The
SNTP UDP PORT NUMBER
When the
SNTP UDP PORT NUMBER
NOTE
d) LOCAL TIME

PATH: SETTINGS PRODUCT SETUP
 LOCAL TIME

5-68

REAL TIME CLOCK
SNTP FUNCTION:
Disabled
SNTP SERVER IP ADDR:
MESSAGE
0.0.0.0
SNTP UDP PORT
MESSAGE
NUMBER: 123
SNTP SERVER IP ADDR
is "Enabled," the L30 attempts to obtain time values from the SNTP/NTP server. Since many time
SNTP SERVER IP ADDR
is 123 for normal SNTP operation. If SNTP is not required, close the port by setting it to 0.
is set to 0, the change takes effect when the L30 is restarted.

REAL TIME CLOCK
LOCAL TIME OFFSET
FROM UTC:
DAYLIGHT SAVINGS
MESSAGE
TIME: Disabled
DST START MONTH:
MESSAGE
January
DST START DAY:
MESSAGE
Sunday
DST START DAY
MESSAGE
INSTANCE: First
DST START HOUR:
MESSAGE
2
DST STOP MONTH:
MESSAGE
January
DST STOP DAY:
MESSAGE
Sunday
DST STOP DAY
MESSAGE
INSTANCE: First
DST STOP HOUR:
MESSAGE
2
L30 Line Current Differential System

SNTP PROTOCOL
Range: Enabled, Disabled
Range: Standard IP address format
Range: 0 to 65535 in steps of 1
must be set to the SNTP/NTP server IP address. Once this address is
setting to "0.0.0.0" and

LOCAL TIME
Range: –24.0 to 24.0 hrs in steps of 0.5
0.0 hrs
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 to 23
Range: January to December (all months)
Range: Sunday to Saturday (all days of the week)
Range: First, Second, Third, Fourth, Last
Range: 0 to 23
5 SETTINGS
to "Enabled." The
SNTP FUNCTION
GE Multilin