Table Of Contents

Grandmaster Clk Class

Version:
    Last Modified: March 9, 2020

    Returns the traceability of the time or frequency distributed by the 802.1AS grandmaster clock used by the time reference associated with this session.

    Data type: datatype_icon

    Long Name:

    Class: 802.1AS

    Permissions: Read

    Integer Clock Class Specification
    0 Reserved to enable compatibility with future versions.
    1-5 Reserved
    6 The clock is synchronized to a primary time reference. The distributed timescale is PTP. A clock in this class cannot be a slave to another clock in the domain.
    7 The clock has previously been designated as Clock Class 6, but has lost the ability to synchronize to a primary time reference. A clock in this class is in holdover mode and operates within holdover specifications. The distributed timescale is PTP. A clock in this class cannot be a slave to another clock in the domain.
    8 Reserved
    9-10 Reserved to enable compatibility with future versions.
    11-12 Reserved
    13 The clock is synchronized to an application-specific time source. The distributed timescale is ARB. A clock in this class cannot be a slave to another clock in the domain.
    14 The clock has previously been designated as Clock Class 13, but has lost the ability to synchronize to an application-specific time source. A clock in this class is in holdover mode and operates within holdover specifications. The distributed timescale is ARB. A clock in this class cannot be a slave to another clock in the domain.
    15-51 Reserved
    52 The clock is degradation alternative A for a Clock Class 7 clock that is not within holdover specification. A clock in this class cannot be a slave to another clock in the domain.
    53-57 Reserved
    58 The clock is degredation alternative A for a Clock Class 14 clock that is not within holdover specification. A clock in this class cannot be a slave to another clock in the domain.
    59-67 Reserved
    68-122 The clock uses an alternate PTP profile.
    123-127 Reserved
    128-132 Reserved
    133-170 The clock uses an alternate PTP profile.
    171-186 Reserved
    187 The clock is degredation alternative B for a Clock Class 7 clock that is not within holdover specification. A clock in this class can be a slave to another clock in the domain.
    188-192 Reserved
    193 The clock is degredation alternative B for a Clock Class 14 clock that is not within holdover specification. A clock of this class can be a slave to another clock in the domain.
    194-215 Reserved
    216-232 The clock uses an alternate PTP profile.
    233-247 Reserved
    248 The default Clock Class. This class is used if none of the other class definitions apply.
    249-250 Reserved
    251 Reserved for version 1 compatibility.
    252-254 Reserved
    255 The clock is a slave-only clock.

    Where This Property Is Available:

    Desktop OS: Windows

    FPGA: Not supported

    Web Server: Not supported in VIs that run in a web application


    Recently Viewed Topics