User manual

Masterclock www.masterclock.com

3. If DHCP was selected and the network device falls back to a “169.254.xxx.xxx” address

approximately every 10 minutes (depending upon the “Advanced Settings” values) the

Ethernet interface will be reinitialized and the network device will attempt to get an IP

address from the DHCP server. If the network device 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 was used this initialization will be delayed by two hours.

Status LED is flashing

Status in WinDiscovery says ‘”Unsynchronized”

Clock is unable to find NTP reference, either primary or secondary

Possible reasons and solutions:

4. 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.

5. Verify that a gateway/router/firewall has been configured that allows the device to

communicate outside of its local network.

6. Verify that the IP address configured for the device 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 device will reset its address 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 device or resolve the duplication. Consult your network administrator for a

range of available IP addresses to avoid IP address conflicts.

7. If using DHCP mode, consult your 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(s), then deselect this option and enter the

NTP server(s) address(s) manually.

8. Verify that the device is connected to the Ethernet LAN.

9. 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.

If the configuration of the network device 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 will be lost.

At this point, it is necessary to manually change the static IP address to one that does not conflict, or

you may do a [Reset Configuration] to restore the system to factory default settings.