.. _instance-specific-considerations-d9d9509c79dd:

================================
Instance Specific Considerations
================================

ptp4l
=====

**Default global parameters**

*   tx_timestamp_timeout 20
*   summary_interval 6
*   clock_servo linreg
*   network_transport L2
*   time_stamping hardware
*   delay_mechanism E2E
*   boundary_clock_jbod 1
*   uds_address /var/run/ptp4l-<instance name>

**Default interface parameters**

None

**Required user-supplied parameters**

``domainNumber <number>``

**Other requirements**

An interface with a port must be assigned to the ``ptp4l`` instance in order
for it to start.

.. note::

   It is recommended to configure one ``ptp4l`` instance per |PHC|. Some |NIC|
   designs have a single |PHC| shared between all the ports on the |NIC|, while
   others may have one |PHC| per port. Refer to the |NIC| documentation to
   determine if a |NIC| has multiple |PHCs|. Configuring a ``ptp4l`` instance
   with multiple interfaces, each with its own |PHC| results in degraded
   timing accuracy or other undesirable behaviors. This means that a given
   ``ptp4l`` instance should only be configured with interfaces that are on the
   same |NIC| and share a |PHC|.

phc2sys
=======

**Default global parameters**

``cmdline_opts '-a -r -R 2 -u 600'``

**Default interface parameters**

None

**Required user-supplied parameters**

``domainNumber <number>``
   This should match with the associated ``ptp4l`` instance.

``uds_address <path>``
   This value needs to be the same as the uds_address for the ``ptp4l``
   instance that ``phc2sys`` is tracking.

**Other requirements**

The ``cmdline_opts`` are defaulted to support interaction with ``ptp4l``. If
``phc2sys`` is instead being used with ``ts2phc``, this parameter will have to
be updated. See :ref:`ptp-instance-examples-517dce312f56` for more information.

.. note::


   The ``cmdline_opts parameter`` overrides all default command line flags for
   the service. This means that when setting ``cmdline_opts``, the full list
   of desired flags should be set.


ts2phc
======

**Default global parameters**

*  ``ts2phc.pulsewidth 100000000``
*  ``leapfile /usr/share/zoneinfo/leap-seconds.list``
*  ``cmdline_opts '-s nmea'``

**Default interface parameters**

``ts2phc.extts_polarity rising``

**Required interface parameters**

*  ``ts2phc.pin_index = 1``
*  ``ts2phc.channel = 1``

**Required user-supplied parameters**

This value is the path to the GNSS serial port that is connected, it will be
named differently on each system.

``ts2phc.nmea_serialport=/dev/gnss0``

**Other requirements**

An interface with a port must be assigned to the ``ts2phc`` instance in order
for time to be synced from GNSS to the |PHC|.

clock
=====

**Default global parameters**

There are no supported global parameters for clock type.

**Default interface parameters**

None

**Required user-supplied parameters**

None

**Other requirements**

The clock type instance is a special instance used for configuring the |NIC|
control parameters of the Westport Channel, Logan Beach, E825 (GNR-D) and E830
(Connorsville) |NICs| clock interface parameters.

These parameters can be applied to the interface of a clock instance |PTP|
parameters:

- sma1 input/output

- sma2 input/output

- u.fl1 output

- u.fl2 input

- synce_rclka enabled

- synce_rclkb enabled

- sdp0

  - output - configure SDP0 pin as output and assign to channel 1

- sdp1

  - input - configure SDP1 pin as input and assign to channel 1

- sdp2

  - output - configure SDP2 pin as output and assign to channel 2

- sdp3

  - input - configure SDP3 pin as input and assign to channel 2

- period_sdp0

  - 1pps - enable 1PPS output on SDP0 pin

  - 1khz - enable 1 KHz output on SDP0 pin

  - 10mhz - enable 10 MHz output on SDP0 pin

- period_sdp2

  - 1pps - enable 1PPS output on SDP2 pin

  - 1khz - enable 1 KHz output on SDP2 pin

  - 10mhz - enable 10 MHz output on SDP2 pin

- tspll_cfg:

  - osc_156.25 - use the 156.25 MHz oscillator clock signal as input reference
    clock for the |PHC|

  - timeref_156.25 - use the 156.25 MHz |DPLL| clock signal (TIME_REF) as input
    reference clock for the |PHC|.

- tx_clk

  - enet - use the 25 MHz oscillator clock signal as |TX| reference clock for the
    |PHY| port

  - synce - use the 156.25 MHz |DPLL| clock signal as |TX| reference clock for the
    |PHY| port.

  - eref0 - use the 156.25 MHz oscillator clock signal as |TX| reference clock
    for the |PHY| port

gnss-monitor
============

**Default global parameters**

*   satellite_count 5
*   signal_quality_db 30
*   cmdline_opts ''

**Default interface parameters**

None

**Required user-supplied parameters**

``devices <space separated gnss devices to be monitored>``

**Other requirements**

``gnss-monitor`` represents an instance of ``gpsd``. ``cmdline_opts`` and
``devices`` are used on the ``gpsd`` service instantiation. Check ``man gpsd`` for
detail options. ``-D 7`` is used for setting loglevel.

Only one instance of ``gnss-monitor`` is allowed per host. ``Collectd``
communicates with ``gpsd`` to monitor the configured |GNSS| devices and
raise/clear alarms based on the configured threshold parameters
``satellite_count`` and ``signal_quality_db``.