54 | EdgeSync Manual rev 1 orolia.com
Figure 28 MIXED mode of operation
The delay mechanism can be end-to-end (E2E) as show in the figure or can be peer-to-peer(P2P). In
P2P, typically the peer delay mechanism (i.e., sending a Peer Delay Request and getting a Peer Delay
Mechanism) is typically over multicast. But, in the case of MIXED mode and with P2P delay mechanism
enabled, then the peer unicast addresses may be used and need to be statically configured.
The MIXED mode of operation is used in the broadcast industry with SMPTE profile.
Monitoring Unicast Operations
Monitoring the status of master unicast operations can be done on the PTP :: Unicast Nodes and PTP ::
Dataset Sections of this User Guide.
PTP Clocks
IEEE 1588 v2 standard specifies different types of clocks that are used to propagate timing and
synchronization. The grandmaster, master and slave (or subordinate) clocks are generally grouped as
ordinary clocks. Intermediate switches and routers in the network can either be a Transparent Clock
(TC) or Boundary Clock (BC). BCs are preferable to TCs as they provide more accuracy and can easily
scale in large networks. Using a hierarchical architecture and using divide and conquer principle, a single
grandmaster does not have to serve large number of slaves.
Figure 29 PTP Clocks
Gateway and Boundary clock
The EdgeSync Multi-Sync Gateway has the capability of using both of its Ethernet ports (Port 1 and
Port 2) as PTP ports. This opens the possibility of using the EdgeSync as a two-port gateway or
boundary clock. For more information about Gateway and Boundary Clocks, see [1].
The Gateway Clock
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General