Ieee 1588V2 Ptp; Figure 17: Ordinary Slave Clock Operation; Figure 18: Ptp Master Clock - Alcatel-Lucent 7450 ESS-12 Configuration Manual

IEEE 1588v2 PTP

Precision Time Protocol (PTP) is a timing-over-packet protocol defined in the IEEE 1588v2
standard 1588 PTP 2008.
PTP may be deployed as an alternative timing-over-packet option to ACR. PTP provides the
capability to synchronize network elements to a Stratum-1 clock or primary reference clock (PRC)
traceable source over a network that may or may not be PTP-aware. PTP has several advantages
over ACR. It is a standards-based protocol, has lower bandwidth requirements, can transport both
frequency and time, and can potentially provide better performance.
PTP is supported on the following platforms provided the indicated hardware components are
included:
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•
The 7450 ESS supports the ordinary clock in slave or master mode or the boundary clock.When
configured as an ordinary clock master, the 7750 SR7450 ESS can only provide frequency
distribution using IEEE 1588v2. The boundary clock and ordinary clock slave can be used for both
frequency and time distribution.
The 7450 ESS communicates with peer IEEE 1588v2 clocks; see
ordinary clock masters, ordinary clock slaves, or boundary clocks. Each peer is identified by the
IPv4 address to be used for communications between the two clocks.
There are two types of peers: configured and discovered. The 7450 ESS operating as an ordinary
clock slave or as a boundary clock should have configured peers for each PTP neighbor clock from
which it might accept synchronization information. The 7450 ESS initiates unicast sessions with
all configured peers. A 7450 ESS operating as an ordinary clock master or boundary clock will
accept unicast session requests from external peers. If the peer is not a configured peer, then it is
considered a discovered peer. The 7450 ESS can deliver synchronization information toward
discovered peers.
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7450 ESS-12—Requires SF/CPM-3 or SF/CPM-4
7450 ESS-7—Requires SF/CPM-3 or SF/CPM-4
7450 ESS OS Basic System Configuration Guide
Figure 12. These peers can be