Epiphan VGADVI Recorder User Manual
Page 44
VGADVI Recorder User Guide
1-4 Configure Date and Time
Table 13
Synchronized Time Options
Label
Description/Options
NTP
Network Time Protocol (NTP) is used for clock synchronization over the internet.
There are many publicly available NTP servers you can use, or your company may
have its own NTP server. For more information about NTP and to find NTP servers,
refer to
RDATE
RDATE is a tool for querying the current time from the network. It is generally
considered obsolete and has been replaced by NTP.
PTP v1
The Precision Time Protocol (PTP) is used for clock synchronization over the
internet. It has clock accuracy in the sub-microsecond range, making it more
granular than NTP.
6. Tailor the synchronization protocol with the required parameters as described below.
7. If NTP is selected:
a. Enter the IP address or server name for the NTP server in the Server IP Address field.
NTP uses UDP packets and port 123. If the device is behind a firewall and accessing an
external NTP server, UDP packets must be permitted on port 123.
8. If RDATE is selected:
a. Enter the IP address or server name for the RDATE server in the Server IP Address field.
b. Select an update interval from the drop down box.
9. If PTP v1 is selected:
a. Select the multicast address of PTP v1 server from the PTP domain dropdown.
PTP Domain
Description
Default
PTP at multicast address 224.0.1.129
Alternative 1
PTP at multicast address 224.0.1.130
Alternative 2
PTP at multicast address 224.0.1.131
Alternative 3
PTP at multicast address 224.0.1.132
PTP uses UDP packets and ports 319 and 320 . If the device is behind a firewall and accessing
an external PTP server, UDP packets must be permitted on ports 319 and 320.
10. Click Apply.
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