Symmetricom ND-SERIES User Manual page 36

• If static IP addressing is being used the original conflicting static IP address can be
restored by doing a soft restart of the ND clock using either WinDiscovery or telnet prior
to changing any other configuration parameters.
[IMPORTANT NOTE: if the configuration of the network clock is changed while a
169.254.xxx.xxx is being used (for example: changing the Time Zone offset), then the
current 169.254.xxx.xxx address will become the permanent static address and the original
conflicting static address is lost. At this point, it is necessary to manually change the static
IP address to a one that will not conflict, or you may do a "Reset Configuration" to restore
the system to factory default settings.]
• If DHCP was selected and the ND fell back to a 169.254.xxx.xxx address approximately
every 10 [depending upon the "Advanced Settings" values] minutes the Ethernet
interface will be reinitialized and the ND clock will attempt to get an IP address from the
DHCP server. If the ND is successful, the error will be cleared and the new address from
the DHCP server will be used. If a discovery was done using WinDiscovery or telnet was
used this initialization will be delayed by 2 hours.
Problem: Clock is unable to find NTP reference, either Primary or Secondary Source.
Problem: Colons are continuously flashing once per second.
Problem: Status in WinDiscovery says 'Unsynchronized'
Possible reasons/solutions:
1. Verify that the NTP server(s) specified are reachable, communicating, and are not flagging their
reported time as invalid. Use a PC-based SNTP client application to verify the server(s) if
necessary.
2. Verify that a gateway/router/firewall has been configured that allows the clock to communicate
outside of its local network.
3. Verify that the IP address configured for the clock is correct. If you manually enter (or DHCP
assigns) an IP address that already exists on the network, this will create an IP address conflict.
The clock will reset its address (fallback) to one within the link-local address space
(169.254.xxx.xxx). If you see that the IP address starts with 169.254, obtain a new IP address
for the clock or resolve the duplication. Consult your IT/Network Administrator for a list/range
of available IP addresses to avoid IP address conflicts.
4. If using DHCP mode, consult your IT/Network Administrator to ensure that your DHCP server
is configured to automatically supply the NTP server address before selecting the "Use NTP
server(s) address provided by DHCP server" checkbox. If the DHCP server cannot
automatically supply the NTP server address(es), then deselect this option and enter the NTP
server(s) address(es) manually.
5. Verify that the clock is connected to the Ethernet LAN.
6. Verify that all network cables, hubs, etc. are in proper working order. Be sure that Ethernet
crossover "patch cables" are not being used where inappropriate.
Problem: Clock is not displaying the correct local time or date.
ND Clocks User Manual - Rev 2.0.1 Sep-08 32
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