TEK-NTS03-G+-Manual-v3.-012022
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The ability to synchronize to IRIG-B may not be supported for units fitted with the advanced
oscillators (OCXO or Rubidium options).
P3: Programmable Output (3-pin 3.81 mm Connector)
This port transmits an un-modulated IRIG-B, programmable pulse, or DCF77 signal
using
RS422 level on pins “+” and “-” of the mating connector. It can be used as the
master source signal to drive the P2 inputs of one or many slave NTS 02/03-G units
or other end devices.
The IRIG-B timing pulses (both leading and trailing edges) from this port are typically to within
100 ns of UTC. A low drive 0 V to +3.3 V signal (single-ended, 0 V referenced) can be obtained
by connecting the signal cable to “+” and “0V” instead of to “+” and “-”.
P3 is a programmable RS422 output that may be configured to output in either inverted or non-
inverted polarity:
•
A configurable number of pulses per second, minute, hour, day with adjustable pulse-
width and offset.
•
IRIG-B time code (Un-modulated DCLS or Modified Manchester) with option
C37.118.1 or AFNOR extensions.
•
Simulated DCF77 receiver time code.
P4: Sync and Antenna Alarm Relays (4-pin 3.81 mm Connector)
The port provides two alarm output channels. The alarm outputs are type “A”
(normally open) dry contact types.
Note
: the “Normally-Open” (NO) descriptor refers to the de-energized state of
the relay.
The NTS 03-G+ operates with the alarm relays energized during normal operation, and de-
energized in the alarm state. It follows that, in the event of all power to the time server being
lost, both of the alarm relays default to the “alarm” state (open contact). The “+” and “-”
symbols are included for reference purposes only, as the alarm contacts are not polarized.
P4 A
is a GNSS signal fail (antenna disconnected or antenna short (over-current)) alarm.
Activation of the alarm (opening of the contact) is delayed by 10 seconds from the onset of the
triggering condition.
P4 B
is a synchronization fail alarm. This alarm is active (contact open) when the unit is not
synchronized and is not in the holdover state. initially powered on and remains active until
