Ptp Boundary Clock For Frequency And Time - Alcatel-Lucent 7450 Basic System Configuration Manual

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

PTP Boundary Clock for Frequency and Time

The router 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.
Basic System Configuration Guide
Figure 23. It does not matter which ports are used to ingress and egress these packets
Figure 23: Ordinary Master Clock Operation
CPM A
Central
Clock
1588
Clock
B
MDA
Network
MDA
System Management
PTP Slave
PTP Slave
Packet
PTP Slave
PTP Slave
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