Administrative Commands to Enable T-GM Functionality

Syntax

ptp-mode;

Hierarchy Level

[edit chassis fpc name pic name]  

Description

The PTP mode configuration is mandatory to enable the PTP ordinary clock feature in the Telecom Grandmaster (T-GM) supported routers.

When you enable PTP mode on the supported routers, port 27 is no longer available for use.

For more information about valid port configurations on the supported routers, see Port Speed Overview.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Syntax

gnss-receiver {
      cable-delay-compensation;
      constellation {
            galileo (e1);
            glonass (l1of);
            gps (l1ca);
            qzss (l1ca);
      }  
      interface; 
      position-mode {
            position-fix-mode (latitude | longitude | altitude);
            survey-mode (survey-length);
      }
      receiver-type;
      snr-threshold 
}

Hierarchy Level

[edit chassis synchronization]

Description

Configure GNSS receiver on the supported routers. The GNSS receiver receives signals from a navigation satellite constellation. The receiver gains precise phase and time information by processing these signals and delivers the information across the packet network.

Options

cable-delay-compensation—GNSS receiver unit to router RF cable delay compensation in nanoseconds. You can specify a value in nanoseconds to compensate the delay that the cable introduces.

• Range: -1000000 through 1000000 nanoseconds

constellation—Various constellations are available. You can configure the GNSS receiver to explicitly use a specific constellation or combination of constellations.

The following constellations are available:

• gps: Enables detection and locking to the GPS constellation.

  GPS signals enable you to determine the position of the receiver on earth and maintain a high level of time accuracy. The GPS L1CA receiver with 10MHz clock frequency output synchronized to a GPS satellite.

  Note: You can use only GPS L1CA to configure the GNSS receiver.

• galileo: Enables detection and locking to the GALILEO constellation.

• glonass: Enables detection and locking to the GLONASS constellation.

• qzss: Enables detection and locking to the QZSS constellation.

interface—Enable/Disable GNSS port/slot communication.

position-mode—GNSS receiver's position modes. You can configure two position modes of GNSS receiver— position-fix-mode and survey-mode.

• position-fix-mode: Use this mode when you know the accurate antenna location.

  • Latitude— Latitude in degrees.

    • Range: -90.0000000 to 90.0000000 degrees

  • Longitude— Longitude in degrees.

    • Range: -180.0000000 to 180.0000000 degrees

  • Altitude— Altitude in meters.

    • Range: -1000 to 18000 meters

  Note:

  Be cautious when you use this mode. Ensure that you configure the correct position. Configuring the wrong position might cause erroneous receiver function and faulty grandmaster clock performance.

• survey-mode: Use this mode when you do not know the fixed location of the antenna.

  GNSS receiver does a self survey of its own position for a period mentioned in survey length and then moves to position fix mode. This is the default mode and the default survey length is 120 minutes.

receiver-type— Only TB-1 is supported as the GNSS receiver.

snr-threshold— GNSS receiver measures the Signal-to-Noise Ratio (SNR) value to indicate the signal strength of the received satellite signal and the noise density. You can configure the SNR threshold value. You can perform positioning by using only those satellites that have signal level equal to or above the threshold value with a range of 0 to 99 dBHz.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Syntax

transport ieee-802.3;

Hierarchy Level

[edit protocols ptp master interface <interface-name> multicast-mode]

Description

Configure Ethernet as the encapsulation type for transport of Precision Time Protocol (PTP) packets. Ethernet encapsulation type is supported for transmission of PTP packets in multicast mode.

Options

802.3—Enable encapsulation for PTP packet transport in multicast mode.

link-local—Enable timeTransmitter or timeReceiver to choose either of the two MAC addresses defined in the IEEE 1588-2008 standard. When you configure this option, the system attempts to use the MAC address (link-local multicast address) for multicast transmission.

If the link-local multicast address is not available, the system uses the standard Ethernet multicast address as a second priority. The link-local multicast MAC address ensures complete end-to-end support of PTP and eliminate the chance of packet transmission through any network element that does not support PTP. The address is the default address for G.8275.1 (PTP profile for time or phase distribution), and a node with this MAC address is a node that supports processing of PTP packets.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.