Amer Networks E5Web GUI - Manual (Page 231)

principles regulating DST vary from country to country, and in some cases there can be variations
within the same country. For this reason, cOS Core does not automatically know when to adjust
for DST. Instead, this information has to be manually provided if daylight saving time is to be
used.
There are two parameters governing daylight saving time; the DST period and the DST offset.
The DST period specifies on what dates daylight saving time starts and ends. The DST offset
indicates the number of minutes to advance the clock during the daylight saving time period.
Example 3.36. Enabling DST
To enable DST, follow the steps outlined below:
Command-Line Interface
Device:/> set DateTime DSTEnabled=Yes
InControl
Follow the same steps used for the Web Interface below.
Web Interface
1. Go to: System/Date and Time
2. Check Enable daylight saving time
3. Click OK
3.9.3. Time Servers
The hardware clock which cOS Core uses can sometimes become fast or slow after a period of
operation. This is normal behavior in most network and computer equipment and is solved by
utilizing external Time Servers which are accessible across the public Internet.
cOS Core is able to adjust the clock automatically based on information received from one or
more time servers which provide a highly accurate time, usually using atomic clocks. Using time
servers is recommended as it ensures cOS Core will have its date and time aligned with other
network devices.
Time Synchronization Protocols
Time Synchronization Protocols are standardized methods for retrieving time information from
external time servers. cOS Core supports the following such protocols:
• SNTP
Defined by RFC 2030, The Simple Network Time Protocol (SNTP) is a lightweight
implementation of NTP (RFC 1305). SNTP is used by cOS Core to query time servers. Most
public time servers are described as being NTP servers and are accessible using SNTP.
• UDP/TIME
The UDP/TIME protocol is an older method of providing time synchronization service over the
Chapter 3: Fundamentals
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