Setting Up an NTP-PTP Configuration Job
  • 21 Jun 2024
  • 6 Minutes to read
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Setting Up an NTP-PTP Configuration Job

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Article summary

The system date and time can be set automatically using either an NTP server or a PTP server. A unit can also act as an NTP server if you select the Enable NTP server option.

To set up an NTP-PTP configuration job

  1. Access the page Commission ▶ Jobs.

  2. Set all common configuration job settings, as described in "Creating Configuration Jobs in GUI Mode" and in "Creating Configuration Jobs Using Data Sets".

  3. Select NTP-PTP in the left pane. The NTP-PTP tab is displayed.
    Setting Up an NTP-PTP Configuration Job_1.PNG

  4. Complete all fields in the NTP-PTP tab as required. For more information on specific parameters, see the table below.

  5. Click Apply, then click Close.

  6. Click the Refresh REFRESH BUTTON.png button to refresh the user interface.

NTP-PTP tab (Commission ▶ Jobs)

Configuration

ParameterDescription
TypeSelect the type of automatic time source to be used on the device.

Possible values: NTP, PTP or PTPv2.

When you select a type, the relevant fields in the rest of the page are enabled.

NTP configuration

ParameterDescription
Enable NTPSets the system time automatically by polling an NTP server. Select a server from the list or add your own.
High resolution syncIf this field is set to True, high-resolution hardware synchronization is enabled. In this mode, the NTP server is queried multiple times and the resulting time is derived from an averaging process based on a hardware clock.

If this field is set to False, the NTP server is queried only every 30 minutes and the system time is set accordingly, without further processing.

Time interval (s)Sets the amount of time after which the unit synchronizes with the NTP server. Expressed in seconds.

Valid range is 8 to 300 seconds.

Number of messagesWhen using NTP, the number of synchronization messages exchanged with the NTP server during each time interval.

Valid range is 5 to 60.

Pri master address

Sec master address

IP addresses of the primary and secondary NTP servers.
Enable NTP serverEnables use of the NTP server service. The device becomes an NTP server and can be used by other devices as an NTP server.
Clock nameUnique identifier of a clock.

PTP configuration

ParameterDescription
Enable PTPSets the system time automatically by polling a PTP master. The unit uses the masters from the list according to the Precision Time Protocol.
UTC offset for master enableWhen using PTP, enable the use of UTC offset from the master clock.
Pri master address

Sec master address

The IP address of the primary PTP server.

The IP address of the secondary PTP server.

Pri domain number

Sec domain number

When using PTP, the domain number of the primary and secondary PTP servers.
Announce intervalWhen using PTP, the announce interval for unicast negotiation. The interval, expressed in seconds, is the base 2 logarithm of the Announce interval. For example, if -1 is selected, the announce interval is 0.5 seconds.

Possible values are:

  • -3 (125 milliseconds)
  • -2 (250 milliseconds)
  • -1 (500 milliseconds)
  • 0 (1 second)
  • 1 (2 seconds)
  • 2 (4 seconds
  • 3 (8 seconds)
Sync intervalWhen using PTP, the synchronization interval for unicast negotiation. The interval, expressed in seconds, is the base 2 logarithm of the Sync Interval. For example, if -3 is selected, the announce interval is 0.125 seconds.

Possible values are:

  • -4 (62.5 milliseconds)
  • -3 (125 milliseconds)
  • -2 (250 milliseconds)
  • -1 (500 milliseconds)
  • 0 (1 second)
  • 1 (2 seconds)

Priority settings

ParameterDescription
DSCPThe priority for the DSCP (Differentiated Services Code Point ) can be set by selecting a value in the drop-down list.
VLAN PriorityIf the link is through a VLAN, the priority of the VLAN frames can be set in the VLAN priority bits.

Possible values: 0 to 7

PTPv2 configuration

Supported devices:

  • Skylight element LT
  • Skylight element LX
ParameterDescription
Clock enableEnables the PTP Precision Time Protocol clock synchronisation module.
Inbound criterionMax threshold for synchronisation to declare synchronisation state. Available options are 1 microsecond, 100 microseconds or class-b

Note: The class-b option is available only for platforms (e.g: LX-SyncE) that support Class-B compliant (See ITU-T G.8273.2)

Prio1A user configurable designation, where the clock belongs to an ordered set of clocks from which a master is selected.

Acceptable values range from 0 to 255

Clock classAn attribute defining a clock’s TAI traceability

Acceptable values range from 0 to 254.

PTP profileDefault PTP profiles set by the administrator.

PTP (IEEE1588-2008) introduced Profile, permitting a liberty on prerequisites, parameters, and algorithm to handle the synchronisation.

Supported profiles:

  • PTP Default Profile: Precision time protocol telecom profile for frequency and phase/time synchronisation, which supports L2 Multicast with Slave mode only.
  • PTP Telecom Profile (ITU-T G.8265.1): Precision time protocol telecom profile for frequency synchronisation, which supports L3 Unicast with Slave Mode only. This Telecom Profile is backward compatible with Accedian legacy PTP feature.
  • PTP Telecom Profile (ITU-T G.8275.1): Precision time protocol telecom profile for phase/time synchronisation with full timing support from the network. Supports L2 Multicast for both Ordinary Clock (Master Clock, Slave Clock) and Boundary Clock with Class-B compliant.
Prio2A user configurable designation, which provides finer grained ordering among otherwise equivalent clocks.

Acceptable values range from 0 to 255

General

ParameterDescription
PTP port nameName of the PTP port.
DomainThe domain number.

Range: 0-255

ModeMulticast or Unicast
Port modeThe PTP port mode. Specifies the state of PTP port.

Possible values:

  • Force-master: Forced to Master state.
  • Force-slave: Forced to Slave state.
  • Auto: The state of PTP port is determined by the Best Master Clock Algorithm.
Unicast IntervalInterval between request of Announce/Sync/Delay Response interval; expressed in seconds.

Acceptable values range from 60 to 1000.

Message frequencies

ParameterDescription
AnnounceSpecifies the interval of Announce messages.

Possible values are:

  • -3: 8 messages/ second
  • -2: 4 messages/ second
  • -1: 2 messages/second
  • 0: 1 message/second
  • 1: 1 message/2 seconds
  • 2: 1 message/4 seconds
  • 3: 1 message/8 seconds
Default value: 1: 1 message/2 seconds
Announce Receipt TimeoutSpecifies the number of Announce messages that can be lost before a timeout occurs.

Range: 2-10 (default is 3)

Sync IntervalSpecifies the interval of Sync messages.

Possible values are:

  • -4: 16 messages/ second
  • -3: 8 messages/ second
  • -2: 4 messages/second
  • -1: 2 messages/second
  • 0: 1 message/second
  • 1: 1 message/2 seconds
  • 2: 1 message/4 seconds
  • 3: 1 message/8 seconds
Sync Rec TimeoutSpecifies the number of Sync messages that can be lost before a timeout occurs.

Range 2-10 (default is 3)

Delay Request OffsetSpecifies delay request offset based on the sync interval.

Range: 0-5

Delay Response TimeoutSpecifies the number of Delay Response messages that can be lost before a timeout occurs.

Range 2-10 (default is 3)

Default PriorityThe localPriority is assigned to a PTP port. This attribute is used when configuring the PTP port in the Telecom Profile ITU-T G.8275.1.

Range: 1-255

Network

ParameterDescription
AddressThe layer-2 multicast destination address. Both the non-forwardable multicast address 01-80-C2-00-00-0E and the forwardable multicast address 01-1B-19-00-00-00 are supported.
InterfaceA name to identify the interface. Indicates the interface used to exchange the PTP messages.

Default is Management.

DiffServ Code PointThe DiffServ Code Point to set in the generated packets. Applies to Layer-3 traffic only.

Expected length: 6 bits

Priority Code PointWhen using PTP, the priority of the VLAN frames can be set in the VLAN priority bits if the link is through a VLAN.

Range: 0-7

Time to liveThe Time To Live (TTL) is the limit on the number of hops a packet is allowed before it is dropped.

Range: 1-255

GRANTOR

ParameterDescription
Grantor nameName of the PTP grantor.
PTP port nameName of the PTP port.
Hostname / AddressName or Address of the PTP master.
Domain numberThe domain number.

Range 0-255.

InterfaceName of the interface used to communicate with the PTP master.

Default is Management.

PriorityThe priority of PTP master.

Acceptable values: 0 (disabled), 1 (best) and 2 (worst).

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