Comtech EF Data CDM-625 - Manual (Page 165)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–65
5.2.1.13.4.2 CONFIG: IP  ANT  PTP (Precision Time Protocol)
Sect. 16.7.2 Precision Time Protocol (PTP) (Chapter 16. ETHERNET NETWORK
MANAGEMENT)
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 used to synchronize 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.
If Enabled, PTP is used to establish independent Wireless Receiver/Transmitter (WRT) protocol
segments – one for LAN and the other for WAN. If Disabled, by default the availability of the PTP
protocol is dependent 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.
On the top line – Use the ▲▼ arrow keys to select PTP as Enabled or Disabled. Then, use the ◄
► arrow keys to first navigate to the bottom line. Use the ▲▼ arrow keys to select the PTP
Grandmaster as follows:
Selection Function
LAN The LAN port receives messages from the PTP master.
WAN The WAN port receives messages from the PTP master.
Press ENTER when done.
5.2.1.13.5 CONFIG: IP AccessList
Use this menu to restore SNMP/HTTP access if your own IP Address is inadvertently
excluded from the Host Access List while configuring the list through either the
SNMP or Web Server (HTTP) interface.
The Host Access List allows a user to define which remote clients can connect when the Access
List is enabled. Each entry allows a user to specify an IP address and a subnet mask to define a
unique class of machines that are allowed access.