Westermo U200 Installation guide - Manual (Page 31)

V4.2
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U/R/T200 series
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SNTP client operation is meant to be used in combination with serial time server operation on
the 15 pin connector (E.g. GPS emulation), see 5.5 and 5.7, or for IRIG-B output generation,
see 5.6.
5.4 PTP Slave
The switch can operate as a PTP version 1 Slave. The switch will then perform time updates
based on incoming PTP SYNC packets from a PTP version 1 Grand Master in the network in
order to update the local clock of the T200 switch.
The “IEEE1588 Slave” tick box must be ticked in the “time synchronization” dialog in the IP
configuration tool in order to enable PTP Slave operation on the T200 switch.
The T200 - IEEE1588 Slave will join the PTP multicast group automatically if IGMP is enabled
on the switch. A T200 – IEEE1588 Slave does also support IEEE1588 Transparent Clock.
The user can define a minimum stratum level at the PTP Slave that shall be used in order to
qualify incoming PTP time sync packets from a PTP Grand Master. This can be done via
SNMP. The following parameter in the “timesync” group of the private MIB of Westermo can
be set:
- SlaveStratum, OID: 1.3.6.1.4.1.16177.1.1.5.26.
Legal stratum levels = [1 .. 255], default is 255 (all stratum levels are acceptable).
A T200-PTP Grand Master that is based on GPS as external time base will have a stratum of:
- 1 if the GPS receiver has sufficient GPS coverage., while the stratum will be
- 2 if the GPS receiver does not have valid sync, but the GPS receiver previously have
had valid synchronization.
- 255 if the GPS receiver does not have valid sync and has not have had valid
synchronization
PTP Slave operation is meant to be used in combination with serial time server operation on
the 15 pin connector (E.g. GPS emulation), see 5.5 and 5.7, or for IRIG-B output generation,
see 5.6.
5.5 Serial time server
The switch can act as a serial time server on the RS422 serial output interface (available in
the 15 pin connector), if the T200 switch is enabled for SNTP client or PTP Slave support.
The “Serial output” tick box must be ticked in the “time synchronization” dialog in the IP
configuration tool in order to enable Serial time server operation on the T200 switch.
Serial enabled devices can be connected to the T200 serial interface and receive UTC strings
or NMEA reports on this interface when the T200 switch is enabled as a serial time server.
The serial output protocols (NMEA or UTC) used for serial time synchronization is described
in the Operator Manual.
The serial output protocol can be set in SNMP:
• serialOutput (OID: 1.3.6.1.4.1.16177.1.1.5.23)