Ptp Boundary Clock For Frequency And Time - Alcatel-Lucent 7450 ESS-12 Configuration Manual

All packets are routed to their destination via the best route as determined in the route table; see
Figure
based time stamping is enabled for higher performance).
PRC

PTP Boundary Clock for Frequency and Time

The 7750 SR supports boundary clock PTP devices in both master and slave states. IEEE 1588v2
can function across a packet network that is not PTP-aware; however, the performance may be
unsatisfactory and unpredictable. PDV across the packet network varies with the number of hops,
link speeds, utilization rates, and the inherent behavior of the routers. By using routers with
boundary clock functionality in the path between the grand master clock and the slave clock, one
long path over many hops is split into multiple shorter segments, allowing better PDV control and
improved slave performance. This allows PTP to function as a valid timing option in more
network deployments and allows for better scalability and increased robustness in certain
topologies, such as rings. Boundary clocks can simultaneously function as a PTP slave of an
upstream grand master (ordinary clock) or boundary clock, and as a PTP master of downstream
slaves (ordinary clock) and/or boundary clocks.
Page 250
19. It does not matter which ports are used to ingress and egress these packets (unless port
TDM/SyncE
Figure 17: Ordinary Master Clock Operation
CPM A
B
Central
Clock MDA
1588
Clock
MDA
7450 ESS OS Basic System Configuration Guide
PTP Slave
PTP Slave
Packet
Network
PTP Slave
PTP Slave
OSSG740