Alcatel-Lucent 7450 ESS-12 - PTP Ordinary Master Clock for Frequency

System Management
7450 ESS OS Basic System Configuration Guide Page 249
Figure 15: Ordinary Slave Clock Operation
PTP Ordinary Master Clock For Frequency
The 7450 ESS supports the PTP ordinary clock in master mode. Normally, a IEEE 1588v2 grand
master is used to support many slaves and boundary clocks in the network. In cases where only a
small number of slaves and boundary clocks exist and only frequency is required, a PTP integrated
master clock can greatly reduce hardware and management costs to implement PTP across the
network. It also provides an opportunity to achieve better performance by placing a master clock
closer to the edge of the network, as close to the slave clocks as possible. Figure 18 shows a PTP
master clock network configuration.
Figure 16: PTP Master Clock
Packet
Network
MDA
Central
Clock
1588
Clock
Internal
(Node)
Timing
Reference
MDA
1588v2
Grand
Master
CPM A
B
1588v2
Grand
Master
OSSG738
Packet
Network
TDM/SyncE
Network
PRC
PTP Slave
PTP Slave
PTP Slave
PTP
Master
Clock
OSSG739