NTP100 – Rev 2.2.0 Oct-12
18
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®
, Inc.
Stratum Level Assignment
– a unique added feature of the NTP100 are stratum levels that are user-assignable. The NTP100
stratum levels are user assignable from 0-15, for both the external reference (primary – GPS or Time Code) and the internal
clock reference (secondary - TCXO).
The factory default stratum level settings for the NTP100 family are “2” for the External Ref, and “3” for the Internal Clock.
The Internal Clock stratum level cannot be adjusted to a reference level exceeding that of the External Reference.
A reference level of “0” is defined to be “disabled”.
The time references for the various models are defined as:
MODEL External High
Precision
Internal Clock Typical Holdover
Stability of Internal
Clock
NTP100-GPS-HS
High Stability
GPS satellite signal OCXO (Oven Controlled
Crystal Oscillator) , & RTC
(real-time clock) reference.
1 ppb/day
<19 mS/day
<7 sec/year
NTP100-GPS
GPS satellite signal
TCXO (Temperature
Compensated Crystal
Oscillator) , & RTC (real-
time clock) reference.
<165 mS/day
<60 sec/year
NTP100-TC
Time Code signal
TCXO & RTC <165 mS/day
<60 sec/year
NTP100-OSC-HS
High Stability
Not Available OCXO (Oven Controlled
Crystal Oscillator) , & RTC
(real-time clock) reference.
1 ppb/day
<19 mS/day
<7 sec/year
NTP100-OSC
Not Available TCXO & RTC. <165 mS/day
<60 sec/year
In addition to the Stratum Level assignment, the allowable time dissemination duration for the operation on the Internal
Clock can be configured in the Advanced Configuration section (see below).
NOTE: The NTP100-GPS has a GPS receiver built in and can be considered a Stratum Level 1 device, as such, it can be
assigned a stratum level of “1” for the “External High Precision Reference” (defined to be: when locked to GPS).
Assignable External and Internal Stratum Levels for the models –GPS and –TC
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