GE 350 Communications Manual page 154

IEC 1588 PRECISION TIME PROTOCOL (PTP)
7–2
• and, that the peer delay mechanism be implemented.
With the
Strict Power Profile
clocks displaying the IEEE_C37_238 identification codes. It uses a port only when the
peer delay mechanism is operational. With the
"Disabled", the relay uses clocks without the power profile identification when no power
profile clocks are present, and uses ports even if the peer delay mechanism is non-
operational. This setting applies to all of the relay's PTP-capable ports.
PTP DOMAIN NUMBER
Range: 0 to 255
Default: 0
The setting is set to the domain number of the grandmaster-capable clock(s) to which
they can be synchronized. A network can support multiple time distribution domains,
each distinguished with a unique domain number. More commonly, there is a single
domain using the default domain number zero. The setting applies to all of the relay's
PTP-capable ports.
PTP VLAN PRIORITY
Range: 0 to 7
Default: 4
The setting selects the value of the priority field in the 802.1Q VLAN tag in request
messages issued by the relay's peer delay mechanism. In compliance with PP (Power
Profile) the default VLAN priority is 4, but it is recommended that in accordance with PTP
it be set to 7.
Depending on the characteristics of the device to which the relay is directly linked, VLAN
Priority may have no effect.
The setting applies to all of the relay's PTP-capable ports.
PTP VLAN ID
Range: 0 to 4095
Default: 0
The 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 (Power
Profile).
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.
The setting applies to all of the relay's PTP-capable ports
PTP EPOCH
Range: UTC since 1995, UTC since 1900, UTC since 1970, TAI since 1970
Default: UTC since 1995
The setting selects the origin of the time scale.
setting set to "Enabled", the relay selects as the master only
Strict Power Profile
350 FEEDER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 7: TIME PROTOCOLS
setting set to