GE Multilin C70 Capacitor Bank Protection and Control System 5-675 SETTINGS 5.2 PRODUCT SETUP5• Depending on the characteristics of the device to which the relay is directly linked, VLAN Priority may have no effect.• This setting applies to all of the relay’s PTP capable ports.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 peerdelay mechanism. It is provided in compliance with PP. As these messages have a destination address that indicatesthey 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.PORT 1 ... 3 FUNCTION• While this port setting is selected to disabled, PTP is disabled on this port. The relay does not generate or listen toPTP messages on this port.PORT 1 ... 3 PATH DELAY ADDER• The time delivered by PTP is advanced by the time value in this setting prior to the time being used to synchronize therelay’s real time clock. This is to compensate to the extent practical for time delivery delays not compensated for in thenetwork. In a fully compliant PP network, the peer delay and the processing delay mechanisms compensate for all thedelays between the grandmaster and the relay. In such networks, this setting should be zero.• In networks containing one or more switches and/or clocks that do not implement both of these mechanisms, not alldelays are compensated, so the time of message arrival at the relay will be later than the time indicated in the mes-sage. This setting can be used to approximately compensate for this delay. However, as the relay is not aware of net-work switching that dynamically changes the amount of uncompensated delay, there is no setting that will alwayscompletely correct for uncompensated delay. A setting can be chosen that will reduce worst-case error to half of therange between minimum and maximum uncompensated delay, if these values are known.PORT 1 ... 3 PATH DELAY ASYMMETRY• This setting corresponds to “delayAsymmetry” in PTP, which is used by the peer delay mechanism to compensate forany difference in the propagation delay between the two directions of a link. Except in unusual cases, the two fibers areof essentially identical length and composition, so this setting should be set to zero.• In unusual cases where the length of the link is different in different directions, this setting should be set to the numberof nanoseconds the Ethernet propagation delay to the relay is longer than the mean of path propagation delays to andfrom the relay. For instance, if it is known say from the physical length of the fibers and the propagation speed in thefibers that the delay from the relay to the Ethernet switch it is connected to is 9 000 ns and the that the delay from theswitch to the relay is 11 000 ns, then the mean delay is 10 000 ns, and the path delay asymmetry is 11000 - 10000 =+1000 ns.c) SNTP PROTOCOLPATH: SETTINGS PRODUCT SETUP REAL TIME CLOCK SNTP PROTOCOLThe C70 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the C70 can obtain clock timeover an Ethernet network. The C70 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a ded-icated product using a GPS receiver to provide an accurate time. UR series relays support unicast, broadcast, multicast,and anycast SNTP functionality.The SNTP FUNCTION setting enables or disabled the SNTP feature on the C70. SNTP PROTOCOLSNTP FUNCTION:DisabledRange: Enabled, DisabledMESSAGE SNTP SERVER IP ADDR:0.0.0.0Range: Standard IP address formatMESSAGE SNTP UDP PORTNUMBER: 123Range: 0 to 65535 in steps of 1
