GE Multilin F650, Instruction Manual

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5-12 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.2 PRODUCT SETUP CHAPTER 5: SETPOINTS
5.2.1.9 PTP IEEE 1588 protocol settings
F650 relay supports IEEE 1588 version 2.
The relay meets the time accuracy requirements of IEC 61850-5-Ed2 clause 11.1.3.3 time synchronization class T5 (± 1 µs)
and of the IEEE Std. PC37.118.1 Draft 1.6 clause 4.3 (± 1 µs), given an error-free PP input and stable temperature
The relay resynchronizes to a grandmaster slewing at ±2 µs/s when the rate of change of frequency stabilizes. It may
become unsynchronized when the ramp starts or stops.
The relay only supports Peer-To-Peer delay mechanism.
PTP FUNCTION
While this port setting is selected to disabled, PTP is disabled on this port. The relay does not generate or listen to PTP
messages on this port.
PORT A, B 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 the
relay’s real time clock. This is to compensate to the extent practical for time delivery delays not compensated for in the
network. In a fully compliant PP network, the peer delay and the processing delay mechanisms compensate for all the
delays 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 all
delays are compensated, so the time of message arrival at the relay is later than the time indicated in the message. This
setting can be used to approximately compensate for this delay. However, as the relay is not aware of network switching
that dynamically changes the amount of uncompensated delay, there is no setting that is always completely correct for
uncompensated delay. A setting can be chosen to reduce the worst-case error to half of the range between minimum and
maximum uncompensated delay, if these values are known.
PORT A, B PATH DELAY ASYMMETRY
Range: -1 000 … +1 000 ns
Default: 0
This setting corresponds to “delayAsymmetry” in PTP, which is used by the peer delay mechanism to compensate for any
difference in the propagation delay between the two directions of a link. Except in unusual cases, the two fibers are of
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 number of
nanoseconds the Ethernet propagation delay to the relay is longer than the mean of path propagation delays to and from
the relay. For instance, if it is known say from the physical length of the fibers and the propagation speed in the fibers that
the delay from the relay to the Ethernet switch it is connected to is 9 000 ns and the that the delay from the switch to the
relay is 11 000 ns, then the mean delay is 10 000 ns, and the path delay asymmetry is +1 000 ns.
PRODUCT SETUP > COMMUNICATION SETTINGS > PTP 1588
Name Default Value Step
PTP FUNCTION DISABLE [DISABLE; ENABLE]
PORTA DELAY ADDER 0 ns [0 : 60000]
PORTA DELAY ASYM 0 ns [-1000 : 1000]
PORTB DELAY ADDER 0 ns [0 : 60000]
PORTB DELAY ASYM 0 ns [-1000 : 1000]
STRICT POWER PROFILE DISABLED DISABLED/ENABLED
PTP DOMAIN NUMBER 0 [0 : 255]
PTP VLAN PRIORITY 4 [0 : 7]
PTP VLAN ID 0 [0 : 4095]
PTP EPOCH UTC SINCE 2000 UTC SINCE 2000; UTC SINCE 1970; UTC SINCE 1900