GE N60 Instruction Manual page 183

5 SETTINGS
the relay to track the first source named that is enabled and operational, or free-run if none of these are available. Here, PP
means a time source that is strictly compliant with PP, and PTP means a time source that is not strictly compliant with PP.
When a time source fails or recovers, the relay automatically transfers synchronization as required by this setting.
The UR clock is updated by all sources active in the device. This means that whenever a time synchronization message is
received through any of the active protocols, the UR clock updates. However, given that IEC 60870-5-103, IEC 60870-5-
104, Modbus, and DNP are low accuracy time synchronization methods, avoid their use for synchronization when better
accuracy time protocols, such as IRIG-B, PTP, and SNTP, are active in the system.
See the 
COMMANDS SET DATE AND TIME
The
REAL TIME CLOCK EVENTS
records the RTC time before the adjustment.
To enable IRIG-B synchronization, the input
synchronization can be disabled by making this setting None.
To configure and enable PTP and/or SNTP, or to set local time parameters (for example time zone, daylight savings), use
the following sections.
b) PRECISION TIME PROTOCOL (1588)

PATH: SETTINGS PRODUCT SETUP
 PRECISION TIME
 PROTOCOL (1588)
MESSAGE
MESSAGE
MESSAGE
MESSAGE

PATH: SETTINGS PRODUCT SETUP
MESSAGE
MESSAGE
MESSAGE
The UR supports the Precision Time Protocol (PTP) specified in IEEE Std 1588 2008 using the Power Profile (PP) specified
in IEEE Std C37.238 2011. This enables the relay to synchronize to the international time standard over an Ethernet net-
work that implements PP.
The relay can be configured to operate on some PTP networks that are not strictly PP. Time accuracy can be less than
specified for a PP network. Tolerated deviations from strict PP include 1) missing declaration of PP compliance in the mes-
sages, 2) connection to a network device that does not support the PTP peer delay mechanism, 3) jitter substantially
greater than 1 µs in received event messages, and 4) certain non-compliant announce and sync message update rates.
The relay implements PTP according to IEEE Std 1588 2008 and the equivalent IEC 61588:2009(E), sometimes
referred to as version 2 PTP. It does not support the previous version of the standard (version 1).
NOTE
PTP is a protocol that allows multiple clocks in a network to synchronize with one another. It permits synchronization accu-
racies better than 1 ns, but this requires each and every component in the network achieve very high levels of accuracy and
a very high baud rate, faster than normally used for relay communications. When operating over a generic Ethernet net-
GE Multilin N60 Network Stability and Synchrophasor Measurement System
menu section of this manual to manually set the RTC.
setting allows changes to the date and/or time to be captured in the event record. The event
IRIG-B SIGNAL TYPE
 
REAL TIME CLOCK
STRICT POWER PROFILE:
Disabled
PTP DOMAIN NUMBER
0
PTP VLAN PRIORITY
4
PTP VLAN ID
0
 PTP PORT 1

 
REAL TIME CLOCK
PORT 1 PTP FUNCTION:
Disabled
PORT 1 PATH DELAY
ADDER: 00000 ns
PORT 1 PATH DELAY
ASYMMETRY: 0000 ns
must be set to DC Shift or Amplitude Modulated. IRIG-B
PRECISION TIME PROTOCOL (1588)
Range: Enabled, Disabled
Range: 0 to 255
Range: 0 to 7
Range: 0 to 4095
PRECISION TIME PROTOCOL (1588)
Range: Enabled, Disabled
Range: 0 to 60 000 ns in steps of 1
Range: –1 000 to +1 000 ns in steps of 1
5.2 PRODUCT SETUP

PTP PORT 1(3)
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