Symmetricom ND-SERIES User Manual page 37

Problem: Clock did not properly negotiate the Daylight Savings Time to standard time (or vice-versa)
transition.
Possible reasons/solutions:
1. Time zone offset has been configured incorrectly. Provide the correct time zone configuration.
2. Daylight savings time has been configured incorrectly. This is configured separately from the
time zone configuration. Provide the correct daylight time configuration by either manually
entering the daylight saving time rules or selecting the single button configuration under
WinDiscovery. If using the convenient single button configuration for US/Canada or EU DST,
be certain to use the latest version of WinDiscovery and apply it for each clock. The latest
version of WinDiscovery will have the latest DST rules for the US/Canada and EU implemented.
Or you may enter the DST rules manually. If using the "Current Windows Setting" button to
apply the DST rules, verify that the rules on the computer are correct.
3. If using DHCP/BOOTP for network configuration, consult with your network system
administrator to see if the optional Time Zone option has been changed. This option as provided
by DHCP can override manual settings.
4. If you have used the Set Time function, note that the clock assumes that you have entered UTC
and will apply your Time Zone and DST configuration relative to the manually entered time.
5. The NTP time server(s) is not available or the NTP server being used has the incorrect UTC
time. Verify the NTP time server is available and is providing the correct UTC time.
Problem: Clock display appears to freeze momentarily.
Problem: Clock appears to 'reset' periodically.
Possible Reasons/solutions:
1. If DHCP is enabled [Note: DHCP is enabled by default] and a DHCP server is not active on the
local network the clock will hesitate periodically while attempting to resolve DHCP
configuration. To correct the problem, switch to manual networking configuration or determine
why the local DHCP server is not operating.
2. If the clock cannot resolve its DHCP address in DHCP mode, the unit will periodically perform a
soft restart to re-initialize its communication port and DHCP configuration. See the trouble
shooting section on fallback IP address
3. If the clock has not been configured with at least one valid DNS server (or that DNS server is
down) hesitations similar to those described in #1 will occur. At least one valid DNS server is
required for operation.
4. If the clock does not have at least one valid NTP server address configured (primary NTP server)
or the server is unreachable for extended periods the clock will periodically perform a soft reset
to re-initialize its communication port and configuration.
Problem: Clock display shows only dashes.
Possible Reasons/solutions:
1. The clock display is not synchronizing with an NTP server and the display has been configured
to display dashes. The time duration (delay) before displaying dashes has elapsed. Verify the
NTP server address is valid and/or reconfigure the clock.
ND Clocks User Manual - Rev 2.0.1 Sep-08 33
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Symmetricom , Inc.