CHAPTER 5: SETTINGS PRODUCT SETUP
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-103
5
5.3.8.3 SNTP protocol
SETTINGS PRODUCT SETUP REAL TIME CLOCK SNTP PROTOCOL
The B90 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the B90 can obtain clock time over
an Ethernet network. The B90 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
SNTP FUNCTION setting enables or disables the SNTP feature on the B90.
To use SNTP in unicast mode, set
SNTP SERVER IP ADDR to the SNTP/NTP server IP address. Once this address is set and SNTP
FUNCTION
is “Enabled,” the B90 attempts to obtain time values from the SNTP/NTP server. Since many time values are
obtained and averaged, it generally takes three to four minutes until the B90 clock is closely synchronized with the SNTP/
NTP server. It takes up to two minutes for the B90 to signal an SNTP self-test error if the server is offline.
To use SNTP in broadcast mode, set the
SNTP SERVER IP ADDR setting to “0.0.0.0” and SNTP FUNCTION to “Enabled.” The B90
then listens to SNTP messages sent to the “all ones” broadcast address for the subnet. The B90 waits up to 18 minutes
(>1024 seconds) without receiving an SNTP broadcast message before signaling an SNTP self-test error.
The
SNTP UDP PORT NUMBER is 123 for normal SNTP operation. The change takes effect when the B90 is restarted.
5.3.8.4 Local time
SETTINGS PRODUCT SETUP REAL TIME CLOCK LOCAL TIME
SNTP PROTOCOL
SNTP FUNCTION:
Disabled
Range: Enabled, Disabled
SNTP SERVER IP ADDR:
0.0.0.0
Range: standard IP address format
SNTP UDP PORT
NUMBER: 123
Range: 1 to 65535 in steps of 1
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
LOCAL TIME
LOCAL TIME OFFSET
FROM UTC: 0.0 hr
Range: –24.0 to 24.0 hr in steps of 0.5
DAYLIGHT SAVINGS
TIME: Disabled
Range: Disabled, Enabled
DST START MONTH:
January
Range: January to December (all months)
DST START DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
DST START DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
DST START HOUR:
2:00
Range: 0:00 to 23:00 in steps of one hour
DST STOP MONTH:
January
Range: January to December (all months)
DST STOP DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
DST STOP DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
DST STOP HOUR:
2:00
Range: 0:00 to 23:00 in steps of one hour
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