Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 200)

WEB BROWSER-BASED CONFIGURATION
200
Note:
NTP feature works through onboard Ethernet port. So you
must make sure that you have connected onboard Ethernet
port.
6.9.7 NTP Configuration
The Network Time Protocol (NTP) is used to synchronize the time
of a computer client or server to another server or reference time
source, such as a radio or satellite receiver or modem. It provides
accuracies typically within a millisecond on LANs and up to a few
tens of milliseconds on WANs relative to Coordinated Universal
Time (UTC) via a Global Positioning Service (GPS) receiver, for
example:
6.9.6 SNMP Configuration
Please refer to Appendix D of SNMP Operation & Installation.