Comtech EF Data CDM-625A - Manual (Page 198)

CDM-625A Advanced Satellite Modem MN-CDM625A
Front Panel Operation Revision 3
6–72
On the top line – To edit the selected Time Server’s IP Address, use the ◄ ► arrow keys to select
a digit, and then use the ▲▼ arrow keys to change that digit.
On the bottom line – this read-only field displays the time and date that the selected server was
last updated. The time displays military format (HH:MM:SS); the date displays DAY-MONTH-
YEAR format in accordance with European convention. As the example shows, this line specifies
“ Never” if no update information exists.
6.2.1.13.4.2 CONFIG: IP  ANT  PTP (Precision Time Protocol)
Sect. K.7.3 Precision Time Protocol (PTP) (Appendix K. ETHERNET NETWORK
CONFIGURATION)
1) If the optional IP Packet Processor card is installed and enabled, then the
CONFIG: IPANTPTP menu and its available submenus and operations
described hereafter, while selectable, are not functional.
2) All network devices between the Grandmaster and Slave devices must support
PTP for sub-microsecond accuracy.
PTP Feature = Enabled
PTP Grandmaster = LAN ()
Precision Time Protocol (PTP) is a FAST-activated feature that synchronizes computer clocks
throughout a computer network. On LANs, PTP achieves clock accuracy in the sub-microsecond
range – much more accurate than what is attainable by NTP (Network Time Protocol) – and it is
also used in network applications where GPS is either unaffordable or inaccessible.
On the top line – Use the ▲▼ arrow keys to select PTP as Enabled or Disabled:
• When Enabled, PTP establishes independent Wireless Receiver/Transmitter (WRT) protocol
segments – one for LAN, and one for WAN.
• When Disabled, by default the availability of the PTP protocol depends on the near-end
(e.g., the RNC/BSC) and distant-end (e.g., the BTS) IEEE 1588v2 (PTP) capable network
devices in the network.
Next, use the ◄ ► arrow keys to navigate to the bottom line.
On the bottom line – Use the ▲▼ arrow keys to select the PTP Grandmaster. Press ENTER.
Note that:
Setting Function
LAN The LAN port receives messages from the PTP master.
WAN The WAN port receives messages from the PTP master.