Ptp (Precise Time Protocol); Ptp Global Settings - D-Link DGS-3630 Series Reference Manual

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide
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PTP (Precise Time Protocol)

The Precision Time Protocol (PTP) system is able to synchronize the distributed clocks with an accuracy of less than
1 microsecond via Ethernet networks.
PTP is a technology that enables precise synchronization of clocks in network systems. PTP is applicable to systems
communicating by Local Area Networks supporting multicast messaging including Ethernet and UDP. PTP enables
heterogeneous systems that include clocks of various inherent precision, resolution and stability to synchronize to a
grandmaster clock.
The synchronization is divided into two processes. The Best Master Clock (BMC) algorithm determines the PTP status
(master/slave) of all local ports. The synchronization algorithm computes the clock offset between the master and
slave clock. There are two mechanisms, Delay Request-response Mechanism and Peer Delay Mechanism, for
measuring the propagation time of an event message.
The PTP system has three types of PTP devices, boundary clock, end-to-end transparent clock, and peer-to-peer
transparent clock. Only the boundary clock can participate in the selection of the best master clock.

PTP Global Settings

This window is used to display and configure the global Precise Time Protocol (PTP) settings.
To view the following window, click System > PTP (Precise Time Protocol) > PTP Global Settings, as shown below:
The fields that can be configured in PTP Global Settings are described below:
Parameter
PTP State
PTP Mode
Figure 3-20 PTP Global Settings Window
Description
Select to enable or disable the PTP feature here. When the PTP function is
enabled, the Switch port will add residence time to correct the field. When the
PTP function is disabled, all Switch ports will forward the PTP packets according
to the multicast filtering configuration.
Select the PTP mode here. Options to choose from are:
• Boundary - Specifies the Switch as a Boundary Clock.
• P2P Transparent - Specifies the Switch as a Peer-to-Peer Transparent
Clock. This is a clock that provides Precision Time Protocol (PTP) event
transit time information and also provides corrections for the propagation
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