NTP100 – Rev 1.0.1 Dec-04
8
© Masterclock
®
, Inc.
[WARNING: An NTP100 will not function properly if configured to use DHCP services when no DHCP server is present on
the network.]
NTP Broadcasts
The NTP100 supports the broadcasting of NTP packets. This feature is useful in situation where network administration may
wish to avoid the network traffic created by a large number of hosts making periodic NTP requests, or in situations where
such periodic requests end up synchronized is such a manner as to exceed the NTP100’s ability to reply.
Note that some firewalls and routers will not forward UDP broadcasts by default. Security configurations may need to be
adjusted to allow the UDP broadcast packets to pass on the configured port.
Configuration
The NTP100 maintains an internal configuration that defines a number of parameters regarding the unit’s operation.
The internal configuration is maintained even when power is off.
Battery Backed RTC and Configuration
The NTP100 maintains its internal configuration and settings in battery backed memory located on the RTC chip. The
battery supplies power to the TCXO 32kHz oscillator and RTC when the unit is powered off. This allows the internal
configuration to be maintained and the time and date to increment, when power is off. Under normal operating condition, the
memory devices maintaining the RTC data and configuration settings is powered by the external DC power supply and does
not rely on the battery for data retention.
The battery type is a ‘replaceable’ lithium coin cell battery .
Note: If the NTP100 does not retain its configuration, or its Date/Time settings (this may be indicated by the front panel time
display counting up from ‘zero’) the battery will likely need replacement. The battery size differs between models. See the
“Specifications” section for details on the recommended battery replacement.
Reset Factory-Default Configuration
In some situations (such as a lost password) it may be necessary to return the NTP100 to its factory default
configuration. A recessed button labeled “RESET”, located on the back of the NTP100 unit, performs this function. To
reset configuration to factory default
1) remove power from the NTP100,
2) depress and hold the reset button, and
3) apply power to NTP100 and continue holding the reset button down for five seconds.
Default Password
The factory-default password for an NTP100 is: public
Configuration Methods
Basic operation of the NTP100 is configured via the WinDiscovery software supplied with the unit, or via Telnet (or the
RS-232 interface for the model(s) NTP100-GPS & NTP100-OSC). Only one configuration method should be used at a
time.
