D-Link DGS-3630-52PC Web UI Reference Guide 2 - Page 36

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide Click the Find button to locate a specific entry based on the information entered. Click the Delete Periodic button to delete the periodic entry. Click the Delete button to delete the specified entry. 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: Figure 3-20 PTP Global Settings Window The fields that can be configured in PTP Global Settings are described below: Parameter PTP State PTP Mode 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 24