Time Zone Offsets; Daylight Saving Time - Symmetricom ND-SERIES User Manual

The device name may be changed from the factory default name by entering a unique name of up to 32
characters. [Hint: You can change the device name to one convenient for your site – preferably one that
helps you to later identify the exact physical location of the device. Up to 32 character device names are
supported]
[Note: The IP address of the unit is required to configure the ND clock with Telnet.]
[Helpful Hint: The DHCP server can be utilized to provide the IP address of the associated device
name that is registered.

Time Zone Offsets

All network clocks maintain time as UTC (UTC is sometimes equated with or referred to as GMT)
internally. A time zone offset (or bias) can be provided to adjust the time for display purposes. A bias
can be set as a positive (+) or negative (-) value with a resolution of one second.
[Note: Factory default: Time Zone Offset configuration for displaying local time is disabled. You
must enable and configure the settings to display local time.]
[Note: It is highly suggested to utilize an NTP time server with UTC reference and configuring the
offsetting for your time zone and DST in your local time display clock.]

Daylight Saving Time

A daylight savings time (summer time) adjustment can be configured separately and in addition to a
time zone offset.
Network time displays provide flexible configuration options supporting most world daylight time
standards.
Daylight time standards vary widely throughout the world. Traditional daylight/summer time is
configured as one (1) hour positive bias. The new US/Canada DST standard, adopted in the spring of
2007 is: one (1) hour positive bias, starting at 2:00am on the second Sunday in March, and ending at
2:00am on the first Sunday in November. In the European Union, daylight change times are defined
relative to the UTC time of day instead of local time of day (as in U.S.). European customers, please
carefully consult the section entitled Device Settings for details on setting daylight time.
To ensure proper hands-free year-around operation, the automatic daylight time adjustments must be
configured using the daylight time option and not with the time zone offset option.
[Note: Factory default: Automatic daylight savings time is disabled. You must enable and configure
the settings to display local time with DST.]
ND Clocks User Manual - Rev 2.0.1 Sep-08
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Symmetricom , Inc.