Display Behavior - Symmetricom ND-SERIES User Manual

normal visual status indication alerting the user that the clock is not synchronized to the NTP
server.
[Note: the ND series of clock displays are enabled with DHCP by default. When configured to
obtain network configuration through DHCP, the display may hesitate on startup while DHCP
is resolved.]
At this time the clock can be communicated with over the local network using the
WinDiscovery application. WinDiscovery can find and identify clocks through the exchange
of broadcast messages by using UDP broadcasts, even when TCP/IP networking parameters
are not configured on the same network.
[Note: networks separated by physical routers will often block UDP broadcasts preventing
WinDiscovery from locating devices on a remote network. Under such circumstances,
WinDiscovery must be operated from a computer within the remote network or routers
separating the networks must be configured to pass through (both directions) UDP broadcasts
on port 6163.]
Once the clock has a valid network configuration and the IP address is known, it can also be
accessed via Telnet by computers in the same logical network.
In situations where providing basic network configuration via WinDiscovery application is not
practical, the clock can also be configured through an RS232 terminal interface. To use this
feature, connect an RS232 terminal (or PC serial port) to the DB-9 connector on the rear of the
clock with a straight-through 9-pin cable. Use the communication settings: 8, N, 1, none.
Once connected, press ENTER once to display the login/menu screen.

Display Behavior

The colons of the clock display will flash once per second when the device is unable to obtain
time from an NTP source. If this condition persists for 24 hours (by default) then dashes will
be displayed. When NTP time is available and valid, the colons will remain steady-on.
Normal (preferred operation) is a display with the colons steady on, indicating that the clock is
synchronized.
[Note: The flashing colons and/or dashes are a normal visual status indication alerting the
user that the clock is not synchronized to the NTP server.]
PM Indicator: If the ND is configured for a 12-hour time display mode, an LED indicator will
appear in the bottom right corner of the display during the PM hours.
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ND Clocks User Manual - Rev 2.0.1 Sep-08 4 Symmetricom , Inc.