GE L90 Instruction Manual page 178

5.2 PRODUCT SETUP
PTP VLAN ID
• This setting selects the value of the ID field in the 802.1Q VLAN tag in request messages issued by the relay's peer
delay mechanism. It is provided in compliance with PP. As these messages have a destination address that indicates
they are not to be bridged, their VLAN ID serves no function, and so may be left at its default value.
• Depending on the characteristics of the device to which the relay is directly linked, VLAN ID may have no effect.
• This setting applies to all of the relay's PTP capable ports.
c) SNTP PROTOCOL

PATH: SETTINGS PRODUCT SETUP
 SNTP PROTOCOL

The L90 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the L90 can obtain clock time over
an Ethernet network. The L90 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. Both unicast and broadcast SNTP are supported.
If SNTP functionality is enabled at the same time as IRIG-B, the IRIG-B signal provides the time value to the L90 clock for
as long as a valid signal is present. If the IRIG-B signal is removed, the time obtained from the SNTP server is used. If
5 either SNTP or IRIG-B is enabled, the L90 clock value cannot be changed using the front panel keypad.
To use SNTP,
SNTP SERVER IP ADDR
is "Enabled", the L90 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 L90 clock is closely synchronized with the SNTP/
NTP server. It may take up to two minutes for the L90 to signal an SNTP self-test error if the server is offline.
The UR-series relays do not support the broadcast, multicast or anycast SNTP functionality.
5-48

REAL TIME CLOCK
SNTP FUNCTION:
Disabled
SNTP SERVER IP ADDR:
MESSAGE
0.0.0.0
SNTP UDP PORT
MESSAGE
NUMBER: 123
must be set to the SNTP/NTP server IP address. Once this address is set and
L90 Line Current Differential System

SNTP PROTOCOL
Range: Enabled, Disabled
Range: Standard IP address format
Range: 0 to 65535 in steps of 1
5 SETTINGS
SNTP
GE Multilin