NTP100 – Rev 1.0.1 Dec-04
14
© Masterclock
®
, Inc.
By default, the models NTP100-GPS and NTP100-TC will allow time dissemination (NTP service) for a period of 24 hours
from loss of the primary source (GPS or Time Code respectively). During this “free-wheeling” or “holdover” period, they
will rely on the internal real-time clock (RTC) and temperature compensated crystal oscillator,( TCXO )oscillator, which has
a typical holdover accuracy of +/- 1 min /year (+/- 165mSec drift over 24 hours or +/- 6.875 mSec drift over 1 hour).
The NTP100 (models –GPS and –TC) will continuously discipline the internal RTC and TXCO reference circuit to provide
maximum accuracy, while locked to the primary GPS or Time Code reference, when trusted and available).
The NTP100-OSC should periodically be set to the time of an external reference such as an NTP Server
The maximum “Validity” duration is adjustable in 1 hour increments. To always allow time dissemination and always
consider the internal clock source “valid”, set the validity duration to “0”
Deselect the “Allow time dissemination..” if you do not want the NTP100-GPS or NTP100-TC to serve time using the
internal RTC and TXCO oscillator.
Set Password
Set/reset the password which controls access to the NTP100’s configuration.
SET/RESET password screen
Internal real-time clock reference disabled on –GPS & TC models
