From 12:00 AM CDT Sunday, October 17 - 11:30 AM CDT Sunday, October 17, ni.com will be undergoing system upgrades that may result in temporary service interruption.

We appreciate your patience as we improve our online experience.

Table Of Contents

Intf.Enet.Time.ClkCls

Last Modified: February 7, 2020

Provides the traceability of time or frequency distributed by the clock when it is the grandmaster. The value for this property is an integer.

The best master clock algorithm (BMCA) uses this property in its comparison of clock quality.

Data type: datatype_icon

Long Name: Interface:Ethernet:Time Sync:Clock Class

Class: XNET Session

Permissions: Read

Clock Class Specification

Integer Description
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.
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.
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.
58 The clock is degradation 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.
68–122 The clock uses an alternate PTP profile.
133–170 The clock uses an alternate PTP profile.
187 The clock is degradation 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.
193 The clock is degradation 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.
216–232 The clock uses an alternate PTP profile.
248 The default Clock Class. This class is used if none of the other class definitions apply.
255 The clock is a slave-only clock.

For the Protocol of IEEE Std 802.1AS-2011, this property corresponds to the clockClass parameter as described in 14.2.3 of IEEE Std 802.1AS-2011, which in turn references 7.6.2.4 of IEEE Std 1588-2008, which describes the clock class specification.

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