Tekron NTS 03-G+ User manual

NTS 03-G+
USER MANUAL
Third Edition Copyright©2020

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Contents
1. INTRODUCTION.................................................................................................................................................................................4
2. FRONT PANEL....................................................................................................................................................................................5
LCD Display...............................................................................................................................................................................................................5
Contrast Adjustment Mode.........................................................................................................................................................8
LED Indicators..........................................................................................................................................................................................................8
Admin (USB) Port .................................................................................................................................................................................................9
3. BACK PANEL.....................................................................................................................................................................................10
P1A/B: Power Input..............................................................................................................................................................................................10
Earth Studs (M4 Nut)..........................................................................................................................................................................................11
4. BACK PANEL INPUTS AND OUTPUTS.........................................................................................................................12
Ant: Antenna Connector (SMA Connector)...........................................................................................................................................12
Antenna Cable Considerations...............................................................................................................................................12
P2: IRIG-B Input (3-pin 3.81 mm Connector)..........................................................................................................................................13
P3: IRIG-B Output (3-pin 3.81mm Connector).....................................................................................................................................13
P4: Sync Alarm Relay (4-pin 3.81mm Connector).............................................................................................................................13
P5: Power Alarm Relay (4-pin3.81 mm Connector)..........................................................................................................................13
ADMIN/ETH 1: Ethernet Administration Port (RJ45).......................................................................................................................14
ETH 2 6: Ethernet Communication Ports (RJ45/ST Fiber Connector)..............................................................................14
P6 P9: Programable Output (50 OHM BNC Connector/ST Fiber connector)...............................................................15
P10 & P11: Programable Output(50 OHM BNC Connector).........................................................................................................15
5. INSTALLATION................................................................................................................................................................................17
Identification...........................................................................................................................................................................................................17
Mounting the NTS 03-G+................................................................................................................................................................................17
Operation..................................................................................................................................................................................................................17
6. FACTORY RESET............................................................................................................................................................................18
7. FACTORY HARDWARE OPTIONS........................................................................................................................................19
Power Supply Options.......................................................................................................................................................................................19
Expansion Board Options................................................................................................................................................................................19
Slave Only Option (Fiber input)....................................................................................................................................................................19
OCXO Option..........................................................................................................................................................................................................19
Rubidium Option...................................................................................................................................................................................................19
8. APPENDIX...........................................................................................................................................................................................20
NTS 03-G+ Specifications..............................................................................................................................................................................20

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Physical Specifications...............................................................................................................................................................20
GNSS Receiver.................................................................................................................................................................................20
Input & Output Connector Specifications.......................................................................................................................20
Input & Output Specifications.................................................................................................................................................21
DC-IRIG/AM-IRIG Availability...................................................................................................................................................21
IRIG-B Translation Chart.............................................................................................................................................................22
Environmental Specifications..................................................................................................................................................22
Electrical Specifications..............................................................................................................................................................23
9. WARRANTY.......................................................................................................................................................................................24

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1. INTRODUCTION
The NTS 03-G+ provides a precision time reference with multiple independently-addressed Ethernet
Ports and optional high drive IRIG-B outputs. A single NTS 03-G+ can support three Ethernet ports
and two alarm ports on the base unit with two different expansions supporting:
•Three additional Ethernet ports and two alarm ports or
•OneadditionalEthernetport,twoalarmports,fourDC IRIG-B(copperorfiber)andtwo DC/AM
IRIG-B ports.
All NTS 03-G+ Ethernet ports function as Stratum 1 (NTP) and Grandmaster (PTP) sources. Each unit
has a built-in GPS/GLONASS-synchronized master clock which provides the source reference time
used by all of the Ethernet ports. In addition, either a high precision OCXO or Rubidium oscillator can
increase holdover from hours to days.
With true dual/redundant power supply options (not just dual power input connectors), the NTS 03-
G+ product is ideally suited for use in industrial environments and can provide NTP & PTP server
functions to multiple independent Ethernet networks.
All NTS 03-G+ units feature a front panel display (See Figure 1) giving visual feedback about the time
Figure 1 NTS 03-G+ front panel
The NTS 03-G+ features an administrative 10/100 Mb Ethernet port through which the units inputs
and outputs can be configured. When the IEEE 1588 v2 (PTP) option is enabled, the unit can operate
as a PTP Grand Master, an ordinary PTP clock, or a Slave-Only Clock.
Configuration software which is available to download from www.tekron.com. Optional accessories
include antenna, low loss antenna cable, antenna pipe mounting components andlightning protection
kit.

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2. FRONT PANEL
Figure 2 NTS 03-G+ front panel
NTS03-G+ featurestwo LED indicatorson thefront panel(SeeFigure2), togetherwith a2-line by16-
character backlit LCD display.
SYNC LED: ThisLED shows the status of the current sync source (as perLED Indicators Table 2)
ALM LED: This LED shows the alarm status of the NTS 03-G+ (as per LED Indicators Table 3)
ADMIN (USB) Port:This portmay beused toconfigure theclock using the Tekron ConfigurationTool
available for download on the Tekron website www.tekron.com.
LCD Display
On initial power-up, the LCD display shows a copyright message, along with the serial number and
revision level of the unit (See Figure 3a). Approximately 10 seconds after power-up, if the NTS 03-G+
is operating in its default mode (GNSS-synchronized), then the display changes automatically to
indicate that it is waiting for satellites (See Figure 3b). Once one or more satellites have been
discovered, it transitions to the operating default display (See Figure 3c). Figure 3d and Figure 3e
show alternative time displays that the user can access by pushing the button on the front panel
between the LED indicators. Successive button-pushes can be used to cycle through all the display
screens in turn. Examples of the display screens are shown below.
3a Start Up (Clock ID)
3b Waiting for Satellites
3c Operating Default
3d Local Time
3e UTC Time
3f Alarm
NTS 03-G + Ver X.XX
(C) 2014 Sn18748
WAITING FOR SYNC
GPS RX STAT: 00A
UTC+1200 17MAR10
076 11:16:53 87A
LST: TUE 17 MAR10
076 11:16:53 87A
UTC: MON 16MAR10
075 23:16:53 87A
*** ANT ***
075 23:16:53 87A

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3g IP Address
Figure 3 LCD display screens (examples) screen
in Figure 3c
local date. The local time day-of-year and time-of-day are on the bottom line.
Figure 3c showsthat the clockis operating with a local time offset of 12hours ahead ofUTC. The local
date is 17th March 2010, and the local time is 11:16:53 in the morning.
Figure 3d shows the same time and date, but also indicates that the time displayed is Local Standard
ime. If daylight savings time is
3
Figure 3e shows the UTC time and date which is 23:16:53 (11:16:53pm) on the evening of Monday 16th
March 2010.
Figure 3f shows that an antenna alarm is active in the clock. All active alarms will be displayed in the
same way.
Figure 3g shows the basic Ethernet network settings for Admin/ ETH 1 port. In this example, it shows
the port has been configured with a fixed IP address of 192.168.96.10.
All screensdisplayed afterthe initial start-upscreen showa three-characterstatus fieldat thebottom
right-hand side of the display. When the NTS 03-G+ is operating in its default mode (GNSS-
synchronized), this field provides further details about the GNSS function as shown in Figure 4Figure
5 and table 1a below.
When the NTS 03-G+ source other than GNSS, this field directly indicates the sync
source.). Table 1b shows the alternate sync sources supported by the NTS 03-G+.
Figure 4 Satellite tracking status
Fixed:
192 . 168 . 096 . 010
Satellites in sky
Satellites tracked
Receiver status
LST: TUE 17 MAR10
076 11:16:53 87A

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Character
Values
Description
Satellites in
the sky
- - 9
- -14
This character represents the total number of satellites currently
position means that NTS 03-G+ has lost its knowledge of the
n
instorage foran extendedperiod,oriftheGNSSreceiverhasbeen
reset. It will typically take 20 minutes (worst case two hours) for
the unit to gain sufficient GNSS synchronization for the NTS 03-
G+ to recommence normal operation (Position hold).
Satellites
tracked
- - 9
- -14
Thisdigit representsthe numberof satellitescurrentlybeing used
ndition
Receiver
status
NTS 03-G+ in Acquisition mode - attempting to get satellite fixes.
positioned in almost a
straight line so best accuracy cannot be obtained, but the unit will
still sync to UTC.
A 2Dposition isin use (noheight). Thismay occurbefore Position
Hold mode has been reached if only 3 satellites are tracked.
Synchronization is not compromised.
A3Dpositionisinuse,whichincludesheight. Asitesurveybegins
next, so this mode is rarely seen.
Site Survey in progress. NTS 03-G+ is calculating an accurate
position; once complete the mode will change to Position hold.
providing its most accurate time, typically better than 40 ns to
UTC.
Table 1a GNSS Status
Character
Values
Description
Alternate
Sync Source
PTP
Clock is synchronized to a PTP Grandmaster
Clock is synchronized to a NTP Server
SLC
Clock is synchronized to an IRIG-B source on P2
Clockis synchronizedto anIRIG-
Clock is operating with manually set time. Please refer to

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Table 1b Alternative Sync Source
If the clock is configured to synchronize to IRIG-
displayed in the status field if there is no IRIG-B signal input.
Contrast Adjustment Mode
The LCD contrast can be adjusted by entering the Contrast Adjustment Mode. This mode is entered
by double pressing the button on the front panel.
Once in Contrast Adjustment Mode, pressing the button will lighten the contrast and decrease the
contrast by one level. There are five different contrast levels and the LCD will cycle from the lightest
to darkest if the button is pressed when on the lightest setting.
To exit the Contrast Adjustment Mode, simply double-press the button on the front panel again. The
button will return to normal operations after this.
LED Indicators
The SYNC LED show the synchronization status of the clock to the active primary reference source.
The primary reference source could be GNSS,PTP or IRIG-B.
State
Description
off
The NTS 03-G+ has no power
on
The NTS 03-G+ is synchronized to the source indicated by the LCD
display
Slow Flash (1 per second)
The NTS 03-G+
running)
synchronization)
Fast Flash (5 per second)
The NTS 03-G+
LED Indicators Table 2 SYNC LED
The ALM LED indicates the internal alarm status of the NTS 03-G. It has only two operating states:-
State
Description
off
The NTS 03-G+ is operating normally. i.e., there are no alarms
Fast Flash (5 per second)
Alarms are active. In this case, the actual alarm state is shown on the top
line of the LCD display, replacing the normal date information (see
example in Figure 3f above).
LED Indicators Table 3 ALM LED

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Alarm State
Definition
*PwrA*
Power A: Power is not present on the Power A (P1A) input
*PwrB*
Power B: Power is not present on the Power B (P1B) input
*Hold*
Holdover: The clock has lost sync, but the outputs are still active and indicating the
appropriate loss of accuracy (oscillator drift).
*Sync*
Lost sync: The clocks has lost sync, the holdover time has expired and the outputs
are not active
*AntL*
Antenna Low: An under-current state has been detected on the antenna input
(antenna disconnected)
*AntH*
Antenna High: An over-current state has been detected on the antenna input
(antenna short circuit)
*Sats*
Satellites Low: The number of satellites have fallen below the user configured
threshold
*IRIG*
No IRIG-B Input: This alarm appears when IRIG-B input monitoring is enabled and
there is no IRIG-B input signal.
Table 4 - Alarm Definitions
Admin (USB) Port
An Admin port (USB type B) is provided to support local configuration/administration. The
USB port has the same configuration options as the Admin Ethernet port 1. The
configuration software supplied with the NTS 03-G+ supports both USB and Ethernet
configuration. A USB driver for the NTS 03-G+ can be downloaded from www.tekron.com.
TheNTS03-G+canbeconfiguredforUSBonlyconfigurationtoaddanextrasecuritylayer.

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3. BACK PANEL
Examples of NTS 03-G+ back panels are shown (See Figure 6 - Figure 9). Their appearance will vary
when fiber Ethernet ports are fitted or the fiber slave option is selected.
Figure 6 Rear panel of NTS 03-G+, 3 Port Option
Figure 7 Rear panel of NTS 03-G+, 6 Port Option
Figure 8 Rear panel of NTS 03-G+, 4 Port with BNC IRIG-B outputs
Figure 9 Rear panel of NTS 03-G+, 4 Port with ST fiber outputs
P1A/B: Power Input Power is applied to the unit via P1A and/or P1B (when fitted). The NTS 03-
G+ can be ordered with high voltage AC input supplies or high or medium
voltage DC supplies, ora combination. IEC-320 powerconnectors (shown to
the left) are used for high voltage AC, and 5.08mm 2-pin connectors for low,
medium or high voltage DC inputs. The polarity of DC power sources is not
importantasboththeunitandcaseareisolatedfromthesupplyinputs.Thisenablestheuseofpositive
earth, negative earth or fully floating DC power sources. If either of the power supplies fails, the clock
will remain operational provided that each power supply is powered from a different source.
The input voltage range is marked below the P1A/B connectors. Refer to section 6.1 for a list of
orderable ranges.

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Check the label on the unit base for power supply voltage ratings before powering the
unit.
If IEC connectors are used, then a 2 A, 250V 5x20 mm glass or ceramic fuse should be
fitted into the IEC connector.
If 2-pin connectors are used, then a 5 A fuse of appropriate voltage rating should be
fitted into the non-earthed power supply line.
NOTE: The Fuse working voltage should be greater than the supply voltage.
Earth Studs (M4 Nut)
Two M4 bolts (to chassis) are provided for earthing.

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4. BACK PANEL INPUTS AND OUTPUTS
Ant: Antenna Connector (SMA Connector)
T to be
installed. The antenna should be connected using a high quality, low-loss 50 Ωcoaxial
cable. Thecenterconductorsupplies 5V DC(100 mAmax) topoweranactiveantenna.
The GNSS receiver inside the NTS 03-G+ is a high-sensitivity unit that supports a wide
range of antenna and lead-in cable combinations. The overall gain of the installed
antenna system (antenna gain less the combined losses in cable, connectors and any
amplifiers/splitters/protection devices included) must fall in the range of 0 dB to 40 dB, with 5 dB to
35 dB preferred.
Antenna Cable Considerations
Tekronoffersatiming-optimized,narrow-band antenna(nominal gain38dB)foruse withtheNTS03-
G. When installed with a 30 m (100ft) lead-in cable (CNT-240) and a lightning protection device, the
overall antenna system gain is around 23 dB, comfortably within the preferred range. For lead-in
lengths longer than about 60 m (200ft), amplification and/or lower loss cable should be considered
and can be supplied to order.
Note: The following figures are based on an average GNSS signal strength of -130dBm at sea level.
CNT-240
32.8 dB/100 m (10dB/100ft). Plus 1 dB/connector
Approx. Optimum Length Range: 18 to 42 meters
Approx. Maximum Length Range: 12 to 70 meters
CNT-400
16.73 dB/100 m. Plus 1 dB/connector
Approx. Optimum Length Range: 34 to 79 meters
Approx. Maximum Length Range: 23 to 129 meters
Note: The examples shown above are based on an average GNSS signal strength of -130 dBm at sea-
level andassumethat theantenna ispositioned withaclear viewof thesky, witha lightningprotection
device fitted in the lead-in cable. It is highly recommended that such a device be installed. A suitable
lightning protection device complete with additional cable connectors, connector crimping tool, and
mounting hardware is available as an optional kit. The lightning protection device inserts a further
2.5dB of loss into the antenna system (largely due to the loss in the additional connectors). This is
equivalent to 8 m (25 ft) of CNT-240 cable, or 4 m (13 ft) of CNT-400 cable.

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Care should be taken to ensure that the connector is not cross-threaded when attaching
the antenna lead-in cable. The connector should be tightened firmly by hand or by a SMA
torque wrench only. DO NOT OVER TIGHTEN.
P2: IRIG-B Input (3-pin 3.81 mm Connector)
This port accepts an RS422 format un-modulated IRIG-B signal (B004 + IEEE C37.118.1
extensions). When configured appropriately, the NTS 03-G+ can synchronize to this
source rather than the internal GNSS receiver, thus operating as a slaved device from
anotherNTS03-G+Mastersource.ConnectionoftheincomingRS422line(120 Ωtwisted
- of the mating connector. An RS422 termination
-
P3: IRIG-B Output (3-pin 3.81 mm Connector)
Thisport transmitsan un-modulatedIRIG-BorprogrammablepulseinRS422 format on
-
to drive the P2 inputs of one or many Slave NTS 02/03-G+ units. The IRIG-B timing
pulses (both leading and trailing edges) from this port are typically to within 100 ns of
UTC. A low drive TTL-compatible output signal (single-ended, 0V referenced) can be
-
P4: Sync Alarm Relay (4-pin 3.81 mm Connector)
(normally- -
de-energized state of the relay. The NTS 03-G+ operates with the alarm relays
energizedduringnormaloperation,andde-energizedinthealarmstate.Itfollowsthat,
in theevent of allpowerto theclock being lost,bothof the alarmrelays defaultto the
- symbols are included for reference
purposes only, as the alarm contacts are not polarized.
P4 A is aGNSS signalfail (antenna disconnected orantenna short(over-current)) alarm.Activation of
thealarm(openingofthecontact)isdelayedby10secondsfromtheonset ofthetriggeringcondition.
P4 B is a synchronization fail alarm. This alarm is active (contact open) when the unit is initially
powered on, and remains active until synchronization is achieved. The contact then closes,
deactivating the alarm. If a loss of synchronization later occurs, then the NTS 03-G+ will operate in
up to a maximum of 970 days. The default setting is 2 minutes. A configurable option is also provided
, allowing the unit to indefinitely.
P5: Power Alarm Relay (4-pin 3.81 mm Connector)

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Theplug-ableconnectorprovidestwoalarmoutputchannels.Wiring sizeisupto1.00
mm². The alarm outputs are type A (normally-open) dry contact types. Note: the
- -energized state of the solid state relay.
The convention used in the NTS 03-G+ is to have the alarm relays energized during
normal operation, and de-energized in the alarm state.
Inthecasethatallpowertotheclockislost, all
contact). - ence purposes only, as the alarm contacts are
not polarized.
P5 A is a power A fail alarm and P5 B is a Power B fail alarm. Alarm signaling is delayed by 10 seconds.
That is, if power supply A fails, the Power A alarm contact will open 10 seconds
1
later.
ADMIN/ETH 1: Ethernet Administration Port (RJ45)
The Ethernet administration port (ETH1), features an RJ45 connector and
supports10/100 Mbps,Auto MDiX& AutoNegotiate.TheLEDsconvey Link(LNK)
and Activity (ACT) status for the port. This port is used to configure the clock via
the Tekron Configuration Tool, which is available for download from the Tekron
website at www.tekron.com.
ETH 2 6: Ethernet Communication Ports (RJ45/ST Fiber Connector)
TheEthernet communicationports(ETH2 6),featurean RJ45(10/100 Mbps,
Auto MDiX & Auto Negotiate) or ST Fiber (100 Mbps) connectors (orderable
option). The LEDs convey Link (LNK) and Activity (ACT) status for the port.
PRP: Parallel Redundancy Protocol
The NTS 03-G+ supports Parallel Redundancy Protocol (PRP) on ports ETH2 and ETH3, and when
fitted with the 6 port option, ETH5 and ETH6. When enabled via the Tekron Configuration Tool, the
ports ETH2 and ETH3 (or ETH5 and ETH6) are paired and operate as a single redundant interface.
PRP support requires the purchase of a PRP License from Tekron.
PRP operation is compliant with IEC 62439-3 (2016), and supports PTP master or slave operation in
IEEE 1588v2 Default profiles or C37.238 Power profile.
NOTE:
At no time will the NTS attempt to operate asan Ethernet Router, Switch or Hub.
1
Note:The alarmcontact willopen10seconds afterthe NTSregisters thefailure. Thiscanbelongerthan10 secondssince
the PSU has storage which allows the switch over between PSUs during faults.

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P6 P9: Programable Output (50 OHM BNC Connector/ ST Fiber connector)
These ports can be ordered as either two BNCs (copper, 5V, 150mA) or as two ST Fiber transmitters.
Figure 10 BNC Connector
Figure 11 ST Fiber Connector
These ports provide high drive, isolated TTL outputs. Each output can be uniquely programmed
through the configuration tool. All ports are electrically isolated from the main clock. The outputs are
paired P6 and P7 as one pair and P8 and P9 as the second pair. Each pair shares a common reference
and power supply.
The user may configure these outputs in either inverted or non-inverted polarity with:
•Aconfigurablenumberofpulsespersecond,minute,hour,daywithadjustablepulse-widthand
offset
•IRIG-B
•DCF-77 time codes
P10 & P11: Programable Output (50 OHM BNC Connector)
Figure 12 BNC Connector with switch
These two ports provide two high drive, isolated TTL outputs (paired) or two AM IRIG-B outputs.
There share a common earth but have separate drivers with the AM IRIG-B transformer isolated from
the rest of the system and the DC IRIG-B optically isolated. A switch located under the connector
allows the port to be selected as either AM or DC IRIG-B
Useeither acoaxialcableor ashielded twistedpair (UsingTekron BNCto 2pinadaptor), tofeed signal
from P10/P11 to any connected IED. When using shielded twisted pair, connectthe shield to ground.
The mark/space amplitude modulation ratio of the AM IRIG-B is 3:1, and peak to peak output level is
7.2 Vpp (max), 120 Ωimpedance. The output is fully floating, and is transformer-isolated to 3.75 kV.
Most devices with AM IRIG-B time sync inputs have an input impedance of between 4 kΩ
and 20 kΩ, and maximum allowable peak-to-peak level of 6 V. The P10/P11 output is
designed to drive multiple devices in parallel, with a terminating resistor (typically 100-

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180 Ω) fitted at the far end of the coax line feeding all of the attached loads. In this way P10/P11
can drive at least 20, and typically 30 or more devices without any external amplification. The
terminating resistor is essential to ensure correct voltage levels.

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5. INSTALLATION
Identification
Each NTS 03-G+ unit is shipped with identification labels on the base and side. The label provides
detailsofthe particularoptionsfittedtothe unit,thepowersupply requirementandthe serialnumber.
Check the identification label on the base of the unit to ensure that the correct model has
been supplied before proceeding to install!
Mounting the NTS 03-G+
The NTS 03-G+
the four corner front panel screws.
Operation
Check the label on the base for voltage requirements before switching on!
Connect the antenna lead and the antenna (with a good view of the sky). Then connect the power
source to P1A/B.
The time required that will achieve tracking and synchronization given a good view of the sky is
typicallywithinaminute.Reactivatingaunitthatwaspreviouslysynchronizedthousandsofkilometers
away from the present position will take longer but not more than 45 minutes.
As described in LCD Display, the button on the front panel will toggle the display on the LCD and can
also enter the Contrast Adjustment Mode.
Once powered up, the operator can determine correct operation of the NTS 03-G+ by observing the
LEDs.The ALM LEDshouldbe offand theSYNC LEDshould beon solid.Ifthe LEDs areflashing,refer
to LED Indicators for an explanation of the status.
To reset the unit, the power must be cycled. To cycle the power, it is recommended that the external
power source switch that the NTS 03-G+ is connected to; is turned OFF, wait a full ten seconds, and
then turned ON again. This will result in the NTS 03-G+ having to resynchronize with the GNSS
satellites.

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6. FACTORY RESET
The NTS 03-G+ features the ability to reset to default factory settings in the event that the
administrator password is forgotten, or if the clock is rendered unreachable on the network due to
incorrect settings, provided that physical accessto the unit is available.
This feature is disabled by default in order to maximize security, and must be enabled via the Tekron
Configuration Tool before it can be used. When disabled, there is no method to gain full access to the
unit without the administrator password,and if the administrator password is forgotten, the unit must
.
This feature may be permanently disabled by Tekron on request.
For further details on this feature, see the configuration tool manual (www.tekron.com/downloads)

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7. FACTORY HARDWARE OPTIONS
Power Supply Options
This table shows the two different power supply connection inputs that may be ordered with NTS 03-
G. The NTS 03-G+ supports dual power supplies, which are independently configurable during
manufacture.
Designator
Input Range
Medium Voltage (2 pin)
20 75 Vdc
High Voltage (IEC320 Inlet)
85 - 265 Vac
High Voltage (2 pin)
85 - 265 Vac; 90 - 300 Vdc
Expansion Board Options
This table shows two additional Expansion board configurations that may be ordered with NTS 03-G.
Expansion
Description
Expansion 1
3x Ethernet
Additional 3 Ethernet ports (RJ45 or Fiber)
Expansion 2
1x Ethernet, 4x DC IRIG-B,
2x AM/DC IRIG-B
Additional Ethernet port (RJ45 or Fiber)
Additional 4 High Drive OR ST Fiber DC IRIG-B ports
Additional 2 High Drive DC IRIG-B OR AM IRIG-B ports
Slave Only Option (Fiber input)
NTS 03-G+ can be ordered as a slave-only device in which case, the SMA Antenna Jack is removed,
and an ST Fiber receiver port (multi-mode) is fitted instead. The unit will then synchronize to an
incoming IRIG-B signal on either P2 (RS422 format signal required) or on the Fiber input
OCXO Option
NTS 03-G+ can be ordered with a GPS Locked precision OCXO. This can provide better than ±10 µs
holdover over 24 hours (7 days aging).
Rubidium Option
NTS 03-G+ can be ordered with a GPS Locked Rubidium oscillator. This can provide better than
±10 µs holdover over 7 days (7 days aging).

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8. APPENDIX
NTS 03-G+ Specifications
Physical Specifications
Performance Property
Metric
Dimensions
Width
430 mm
Depth
270 mm
Height
45 mm
Weight
2.0 kg
GNSS Receiver
L1/GLONASS (1575.42 / 1598 MHz) Frequency, C/A Code, 32 Channel, parallel-tracking
receiver
Performance Property
Metric
Position Accuracy
Horizontal
<9 m (90%)
Altitude
<18 m (90%)
Timing Accuracy
15 ns (1 sigma) to UTC
Acquisition
Reacquisition
<2 s (90%)
Hot Start
<18 s (90%)
Warm Start
<45 s (90%)
Cold Start
<50 s (90%)
Sensitivity
Acquisition
-155 dBm
Tracking
-160 dBm
Input & Output Connector Specifications
Type
Electrical
Physical
Accuracy at the port
AM IRIG-B (modulated)
7.2 Vp-p
50 OHM BNC
µs of UTC
TTL (DC)
5 V
50 OHM BNC
Fiber (λ=820 nm)
N/A
ST