Figure 16-14. Ptp Master/Slave Assignment Example - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Ethernet Network Configuration
•
When the modem must synchronize with the Grandmaster over the WAN interface, set
Grandmaster to WAN.
When Grandmaster is WAN, the modem will set its PTP Clock Priority1 value to 1 (the highest)
to force slave devices that use the BMC algorithm to accept the modem as the PTP master.
Symbol Designation
M
S
Grandmaster

Figure 16-14. PTP Master/Slave Assignment Example

As shown in Figure 16-14:
•
The first segment is between the RNC/BSC and the CDM-625 'A' (near-end modem) LAN
port. In this segment, the RNC/BSC is the master, and the near-end modem LAN port is
the slave.
Using the CDM-625 'A' front panel or its Web Server Interface, set the PTP Grandmaster
on this near-end modem as LAN.
•
The second segment is from the CDM-625 'A' (near-end modem) WAN port to the
CDM-625 'B' (distant-end modem) WAN port, in which the near-end modem WAN port
is the master and the distant-end modem WAN port is the slave.
Using the CDM-625 'B' front panel or its Web Server Interface, set the PTP Grandmaster
on this distant-end modem as WAN.
Function
Master The Master device maintains the clocks.
Slave The Slave device synchronizes its clock to the Master device's clock.
The r oot t iming r eference t hat transmits s ynchronization i nformation t o t he c locks
residing on its network segment.
16–17
Revision 13
MN-CDM625