Setting Date and Time Automatically using PTP
- 23 Jan 2024
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Setting Date and Time Automatically using PTP
- Updated on 23 Jan 2024
- 9 Minutes to read
- Contributors
- Print
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- PDF
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Precision Time Protocol (PTP), offers an advanced method of synchronisation in Ethernet networks. Users can enable this synchronisation to achieve maximum scalability in the network infrastructure.
PTP boundary clock enables users to configure a clock with multiple PTP ports in a domain and maintains the timescale used in the domain. It can serve as the main source of time, for example, the master clock and can also synchronise to another clock, such as a slave clock.
Note: PTP Boundary Clock is only available on LX-SyncE only.
To update the date and time automatically using PTP
- Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration
PTP Settings
| Parameter | Description |
|---|---|
| Clock Enable | Enables the PTP Precision Time Protocol clock synchronisation module. |
| Inbound criterion | Max 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) |
| Inbound status | Current state of the synchronisation error. (Expressed in nanoseconds) |
| Synchronisation status | The status of the synchronisation. |
Clock parameters
| Parameter | Description |
|---|---|
| Class | An attribute defining a clock’s TAI traceability Acceptable values range from 0 to 254. |
| Prio 1 | A 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 |
| Prio 2 | A user configurable designation, which provides finer grained ordering among otherwise equivalent clocks. Acceptable values range from 0 to 255 |
| PTP Profile | Default 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:
|
| Layer-2 PTP port list | List of PTP ports for Default profile and PTP Telelcom ITU-T G.8275.1 profile. |
| Layer-3 PTP port list | List of PTP ports for PTP Telelcom ITU-T G.8265.1 profile. |
Setting the System Date and Time Automatically Using a GPS
To set the system date and time using a GPS
Access the page System ▶Configuration ▶Time ▶GPS.
Click Apply.
Note: If you enable the GPS without having it locked to a GPS signal (GPS fix) and attempt to use the unit as an NTP server, the unit will set the LI bit in the NTP packet identifying the NTP clock as "not synchronised".
GPS Settings (System ▶Configuration ▶Time ▶GPS)
| Parameter | Description |
|---|---|
| Enable | Use the GPS receiver to set the system time automatically. |
| Satellite SNR | The Signal-to-Noise ratio, expressed in dB – Hz, of each satellite in view |
| GPS Fix | Shows whether the GPS receiver is locked to a GPS signal |
| Latitude / Longitude | The current location of the unit, according to its GPS receiver |
Configuring PTP Port Settings
To create a new PTP port for the selected profile
Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration.
Click Add under the Layer-2 or Layer-3 PTP port list.
Click Apply.
To delete a PTP port for the selected profile
Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration.
Click on the PTP port.
Click Delete.
To edit a PTP port for the selected profile
Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration.
Click on the PTP port.
Click Apply.
PTP Settings (System ▶Configuration ▶Time ▶PTP ▶Configuration)
To add a Layer-3 PTP port
From System ▶Configuration ▶Time ▶PTP ▶Configuration.
Select the Telecome Profile (ITU-T G.8265.1) in the PTP settings dialog.
Click Add , under Layer-3 PTP port list, and the Layer-3PTP port settings dialog will open.
| Parameter | Description |
|---|---|
| PTP port name | Name of the PTP port. |
| Time to Live | The Time To Live (TTL) is the limit on the number of hops a packet is allowed before it is dropped. Range: 1-255 |
Priority Settings
| Parameter | Description |
|---|---|
| DiffServ Code Point | When using PTP, the priority can be set in the Differentiated Services Code Point by making a selection in the drop-down list. Range: 0-63. When 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 |
Message Frequencies
| Parameter | Description |
|---|---|
| Sync Interval | Specifies the interval of Sync messages. Possible values are:
|
| Announce Interval | Specifies the interval of Announce messages. Possible values are:
|
| Announce Receipt Timeout | Specifies the number of Announce messages that can be lost before a timeout occurs. Range 2-10 |
Unicast configuration
| Parameter | Description |
|---|---|
| Unicast Renew Interval | Interval between request of Announce/Sync/Delay Response interval; expressed in seconds Acceptable values range from 60 to 1000. |
| Port mode | The PTP port mode. Specifies the state of PTP port. Possible values:
|
Telecom Slave Configuration
| Parameter | Description |
|---|---|
| Sync Receipt Timeout | Specifies the number of Sync messages that can be lost before a timeout occurs. Range 2-10. |
| Delay Response Receipt Timeout | Specifies the number of Delay Response messages that can be lost before a timeout occurs. Range 2-10. |
To add a Layer-2 PTP port
From System ▶Configuration ▶Time ▶PTP ▶Configuration.
Select the Default profile (IEEE1588-2008) or the Telecome profile (ITU-T G.8275.1) in the PTP settings dialog.
Click Add , under Layer-2 PTP port list, and the Layer-2 PTP port settings dialog will open.
| Parameter | Description |
|---|---|
| PTP port name | Name of the PTP port. |
| Interface name | A name to identify the interface. Indicates the interface used to exchange the PTP messages. |
| Multicast address | The 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. |
| Domain | The domain number. Range 0-255. |
| Port mode | The PTP port mode. Specifies the state of PTP port. Possible values:
|
Priority Settings
| Parameter | Description |
|---|---|
| Priority Code Point | When 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 |
Message frequencies
| Parameter | Description |
|---|---|
| Sync Interval | Specifies the interval of Sync messages Possible values are:
|
| Delay Request Offset | Specifies delay request offset based on the sync interval. Range: 0-5. |
| Announce Interval | Specifies the interval of Announce messages. Possible values are:
|
| Announce Receipt Timeout | Number of Announce messages not received before a timeout is triggered. Range 2-10. |
Telecome Profile Configuration
| Parameter | Description |
|---|---|
| Default priority | The 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 |
Viewing Summary of PTP Port Statistics
To view the summary of PTP port statistics
- Access the page System ▶ Configuration ▶ Time ▶ PTP ▶ Statistics .
A dialog appears with the statistics.
PTP Statistics (System ▶Configuration ▶Time ▶PTP ▶Statistics)
| Parameter | Description |
|---|---|
| Index | Index assigned to the PTP port. |
| PTP port name | Name of the PTP port. |
| Last mean path delay | The last known value that PTP frames take to travel between the master and slave. |
| Last offset adjustment | The last offset adjustment for the PTP port. |
| Nbr of synchronisation | Number of PTP port synchronisations. |
| Nbr of correction | Number of PTP port corrections |
To view PTP port statistics
- From System ▶Configuration ▶Time ▶PTP ▶Statistics.
- Click on the PTP Port you wish to view, a dialog opens with the PTP port statistics.
PTP Port Statistics (System ▶Configuration ▶Time ▶PTP ▶Statistics)
| Parameter | Description |
|---|---|
| PTP version | The PTP version number supported on the unit. |
| Port mode | The PTP port mode. |
| Port state | The state of the PTP port. |
| Clock ID | Identifies the clock |
| Port ID | Identifies the port |
Unicast Negociation Mechanism Message counters
| Parameter | Description |
|---|---|
| T1 | The last value of T1 timestamp |
| T2 | The last value of T2 timestamp |
| T3 | The last value of T3 timestamp |
| T4 | The last value of T4 timestamp |
| Last corr. field | The last value of correction field |
| Master Id | Identifies the current master clock |
| Master address | The address of the current master clock |
| Class | PTP clock class of the current master clock. An attribute defining a clock’s TAI traceability Note: When advertising a new clock class in SyncE and PTP a trap will now be generated and provide the new clock class |
| Prio 1 | Priority 1 of the current master clock. A user configurable designation, where the clock belongs to an ordered set of clocks from which a master is selected. |
| Prio 2 | Priority 2 of the current master clock. A user configurable designation, which provides finer grained ordering among otherwise equivalent clocks. |
| Accuracy | Accuracy of the current clock |
| Variance | Stability of the current clock |
| Steps removed | Number of communication paths traversed between the local clock and the grandmaster clock |
| Time source | Time source of PTP, it may be internal or a source external to PTP |
| Grandmaster Id | Identifies the grandmaster |
General Message counters
| Parameter | Description |
|---|---|
| Announce | Number of Announce messages received or transmitted. |
| Sync | cell |
| Follow-up | Number of Announce messages received or transmitted. |
| Delay Request | Number of Follow-up messages received or transmitted. |
| Delay Response | Number of Delay Request messages received or transmitted. |
| Rx | Rx values for:
|
| Tx | Tx values for:
|
| Request | Number of Announce, Sync, Delay Response messages requested |
| Grant | Number of Announce, Sync, Delay Response messages granted |
| Cancel | Number of Announce, Sync, Delay Response messages cancelled |
| AckCancel | Number of Announce, Sync, Delay Response messages ackCancelled |
Configuring the PTP Grantor for the PTP Port
To configure the PTP Grantor
Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration.
Click on the PTP port you wish to configure from the Layer-3 PTP port list.
Click the Add button below the Unicast PTP Grantor list.
Select the values you wish to configure for the PTP grantor..
Click Apply.
To delete a PTP Grantor instance
Access the page System ▶Configuration ▶Time ▶PTP ▶Configuration.
Select the PTP port in the Layer-3 PTP port list by clicking its name.
Select the PTP grantor instance in the Unicast PTP Grantor list by clicking its name.
Click Delete.
Note: To access the Unicast options, you must select the Telecom Profile (ITU-T G.8265.1) radio button in the PTP Profile settings.
Users can only configure a PTP grantor when working on profile ITU-T G.8265.1.
PTP Grantor configuration for the PTP Port (System ▶Configuration ▶Time ▶PTP ▶
Configuration)
| Parameter | Description |
|---|---|
| PTP Grantor name | Name of the PTP grantor. |
| Interface name | Name of the interface used to communicate with the PTP master. |
| Hostname / Address | Name or Address of the PTP master. |
| Domain | The domain number. Range: 0-255 |
| Priority | The priority of PTP master. Acceptable values: 0 (disabled), 1 (best) and 2 (worst). |
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