Tekron NTS 03-G+ User manual

NTS 03-G+
USER MANUAL
Third Edition – Copyright©2021

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© 2022 by Tekron International Limited. All Rights Reserved. All trademarks are the property of their respective holders. The
information in this document is provided for informational use only and is subject to change. For further information or support,
go to www.tekron.com.
Contents
1. INTRODUCTION ....................................................................................................................... 4
Product Overview ..................................................................................................................................... 4
Hardware .................................................................................................................................................. 4
Front Panel................................................................................................................................................ 4
Configuration ............................................................................................................................................ 5
Accessories................................................................................................................................................ 5
2. FRONT PANEL........................................................................................................................... 6
LCD Display................................................................................................................................................ 6
Contrast Adjustment Mode..................................................................................................... 9
LED Indicators .........................................................................................................................................10
Admin (USB) Port ....................................................................................................................................12
3. BACK PANEL........................................................................................................................... 13
P1A / P1B: Power Input(s).......................................................................................................................13
Earth Studs (M4 Nut) ..............................................................................................................................14
4. BACK PANEL – INPUTS AND OUTPUTS .................................................................................. 15
Ant: Antenna Connector (SMA Connector) ............................................................................................15
Antenna Cable Considerations .............................................................................................. 15
P2: IRIG-B Input (3-pin 3.81 mm Connector) ..........................................................................................16
P3: Programmable Output (3-pin 3.81 mm Connector) .........................................................................17
P4: Sync and Antenna Alarm Relays (4-pin 3.81 mm Connector)........................................................... 17
P5: Power Alarm Relays (4-pin 3.81 mm Connector) ............................................................................. 18
ADMIN/ETH 1: Ethernet Administration Port (RJ-45).............................................................................18
ETH 2 – ETH 6: Ethernet Communication Ports (RJ-45/ST Fiber Connector).......................................... 19
P6 – P9: Programmable Output (50 OHM BNC connector/ ST Fiber connector) ................................... 19
P10 & P11: Programmable Output (50 OHM BNC connector) ...............................................................21
5. SOFTWARE............................................................................................................................. 22
Configuration Tool ..................................................................................................................................22
USB driver ...............................................................................................................................................22
6. INSTALLATION........................................................................................................................ 23
Identification...........................................................................................................................................23

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Location...................................................................................................................................................23
Hazardous Voltage ..................................................................................................................................23
Earthing................................................................................................................................................... 24
Mounting the NTS 03-G+ ........................................................................................................................ 24
Operation................................................................................................................................................24
7. FACTORY RESET ..................................................................................................................... 25
8. FACTORY HARDWARE OPTIONS ............................................................................................ 26
Power Supply Options.............................................................................................................................26
Expansion Board Options........................................................................................................................ 26
Slave Only Option (Fiber input)............................................................................................................... 26
OCXO Option...........................................................................................................................................26
Rubidium Option.....................................................................................................................................27
9. APPENDIX............................................................................................................................... 28
NTS 03-G+ Specifications ........................................................................................................................28
Physical Specifications........................................................................................................... 28
GNSS Receiver........................................................................................................................ 28
Input & Output Connector Specifications ............................................................................. 28
Input & Output Specifications ............................................................................................... 29
DC-IRIG/AM-IRIG Availability................................................................................................. 29
IRIG-B Translation Chart ........................................................................................................ 30
Environmental Specifications ................................................................................................ 31
Electrical Specifications ......................................................................................................... 31
10. WARRANTY ............................................................................................................................ 32
Notes.......................................................................................................................................................32

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1. INTRODUCTION
Welcome to the NTS 03-G+ user manual! This document contains everything you need to know
about the key features, hardware, and installation process for the NTS 03-G+.
Product Overview
The Network Time Server 03-G+ (NTS 03-G+) is a precision time reference with multiple
independently addressed Ethernet ports and optional high drive IRIG-B outputs.
The NTS 03-G+ has three Ethernet ports and two alarm ports on the base unit with two
different optional expansion options:
•Expansion 1 (6 port expansion) - Three additional Ethernet ports and two alarm ports
•Expansion 2 (4 port expansion) - One additional Ethernet port, two alarm ports, four DC
IRIG-B (copper or fiber) and two DC/AM IRIG-B ports.
The NTS 03-G+ can be ordered with no expansion (NTS 03-G+ 3 port), or with either of the
expansion options above (NTS 03-G+ 4 port, NTS 03-G+ 6 port).
Hardware
All NTS 03-G+ Ethernet ports can function as Stratum 1 (NTP) and Grandmaster (PTP) sources.
Each unit has a built-in GPS/GLONASS synchronized master clock which provides the reference
time used by all Ethernet ports. In addition, the NTS 03-G+ can be fitted with either a high
precision OCXO or Rubidium oscillator, which increases holdover from hours to days.
With a dual redundant power supply option (not just dual power input connectors), the NTS 03-
G+ product is ideally suited for use in industrial environments and can provide NTP and PTP
server functions to multiple independent Ethernet networks.
Front Panel
The NTS 03-G+ features a front panel display (see Figure 1), giving visual feedback about the
time data being generated on the outputs. LED indicators provide “at a glance” status
information.
Figure 1 - NTS 03-G+ front panel

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Configuration
The NTS 03-G+ features an administrative 10/100 Mbps Ethernet port through which the unit’s
inputs and outputs can be configured. When the IEEE 1588-2008 (PTPv2) option is enabled, the
unit can operate as a PTP grandmaster, an ordinary PTP clock, or a slave only clock.
Accessories
The NTS 03-G+ comes complete with Ethernet cables to allow for customization and easy setup
from the Windows™ Configuration software which is available to download from
www.support.tekron.com.
Optional accessories include antenna, low loss antenna cable, antenna pipe mounting
components, lightning protection kit, in-line amplifiers, and connector adaptors.

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2. FRONT PANEL
The NTS 03-G+ features two LED indicators on the front panel (see Figure 2 - NTS 03-G+ front
panel), together with a 2-line by 16-character backlit LCD display.
SYNC LED: Shows the status of the current sync source (as per LED Indicators Table 3).
ALM LED: Shows the alarm status of the NTS 03-G+ (as per LED Indicators Table 4).
ADMIN (USB) Port: This port can be used to configure the time server using the Tekron
Configuration Tool 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 3).
After power-up, if the NTS 03-G+ is configured to operate in its default mode (GNSS
synchronized), then the display changes automatically to indicate that it is waiting for satellites
(see Figure 4).
Once one or more satellites have been discovered, it transitions to the operating default display
(see Figure 5).
Figure 6 and Figure 7 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.
Figure 2 - NTS 03-G+ front panel

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Figure 3 - Start Up (Time Server ID)
Figure 4 - Waiting for Satellites
Figure 5 - Operating Default
Figure 6 - Local Time
Figure 7 - UTC Time
Figure 8 - Alarm
Figure 9 - IP Address
Figure 10 – LCD display screens (examples)
“UTC” is the abbreviation of Coordinated Universal Time (approximately equivalent to GMT).
The top line of screen in Figure 5 shows the time server’s current local time offset from UTC
(hours and minutes), together with the local date. The local time day-of-year and time-of-day
are on the bottom line.
Figure 5 shows that the time server is operating with a local time offset of 12 hours ahead of
UTC. The local date is the 17th of March 2010, and the local time is 11:16:53 in the morning.
Figure 6 shows the same time and date, but also indicates that the time displayed is Local
Standard Time, and that the day is Tuesday. “LST” denotes Local Standard Time. If daylight
savings time is active, the “LST” in screen Figure 6 - Local Time changes to “LDT”, denoting Local
Daylight Time.
Figure 7 shows the UTC time and date which is 23:16:53 (11:16:53pm) on the evening of
Monday the 16th of March 2010.
Figure 8 shows that an antenna alarm is active in the time server. All active alarms will be
displayed in the same way.
Figure 9 shows the basic Ethernet network settings for Admin/ETH1 port. In this example, it
shows the port has been configured with a fixed/static IP address of 192.168.96.10.
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 16
MAR10
*** ANT ***
075 23:16:53 87A
Fixed:
192 . 168 . 096 . 010

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All screens displayed after the initial start-up screen show a three-character status field at the
bottom right-hand corner 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 11 and Table 1 - GNSS Status below.
When the NTS 03-G+ is synchronized to a source other than GNSS, this field directly indicates
the alternate sync source being used. Table 2 - Alternative Sync Source shows the alternate
sync sources supported by the NTS 03-G+.
Figure 11 – Satellite tracking status
Table 1 - GNSS Status
Character
Values
Description
Satellites in
the sky
“0 - 9”: 0 - 9
“A - E”: 10-14
“F”: >14
This character represents the total number of satellites
currently present in the sky according to the GNSS almanac.
“0” in this position means that NTS 03-G+ has lost its
knowledge of the GNSS satellites’ orbit geometries. This
occurs if the unit has been in storage for an extended period,
or if the GNSS receiver has been reset. It will typically take 20
minutes (worst case two hours) for the unit to gain GNSS
synchronization and resume normal operation.
Satellites
tracked
“0 - 9”: 0 - 9
“A - E”: 10-14
“F”: >14
This digit represents the number of satellites currently being
used to compute the time solution. A “0” value means that no
updated time solution is available, (“out of lock” condition). If
this condition persists for the “Holdover” time the time server
will indicate the “out of sync” condition.
Receiver
status
“A”
NTS 03-G+ is in Acquiring mode - attempting to get satellite
fixes.
“G”
“Bad geometry”: Satellites are positioned in almost a straight
line so best accuracy cannot be obtained, but the unit will still
sync to UTC.
Satellites in sky
Satellites tracked
Receiver status
LST: TUE 17 MAR10
076 11:16:53 87A

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Character
Values
Description
“S”
Site Survey in progress. NTS 03-G+ is calculating an accurate
position; once complete the mode will change to Position
hold.
“P”
“Position hold”: Position is known accurately, and the GNSS is
providing its most accurate time, typically better than 40 ns to
UTC.
Table 2- Alternative Sync Source
Character
Values
Description
Alternate
Sync Source
“PTP”
The NTS 03-G+ is synchronized to a PTP grandmaster
“NTP”
The NTS 03-G+ is synchronized to a NTP server
“SLC”
The NTS 03-G+ is synchronized to an IRIG-B source on P2 input
“Slave: Copper”
“SLF”
The NTS 03-G+ is synchronized to an IRIG-B source on the fiber
input “Slave: Fiber”
“TST”
The NTS 03-G+ is operating with manually set time.
If the NTS 03-G+ is configured to synchronize to IRIG-B only (ignore GNSS) then “SL?”
will be displayed in the status field if there is no IRIG-B signal input or an invalid
signal input.
Contrast Adjustment Mode
The LCD contrast can be adjusted by entering the Contrast Adjustment Mode. This mode is
entered by holding down the button on the front panel for approximately 3 seconds.
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 darkest to the lightest if the button is pressed when on the lightest setting.
To exit the Contrast Adjustment Mode, hold down the button on the front panel for
approximately 3 seconds again. The button will return to normal operation after this.

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LED Indicators
The SYNC LED show the synchronization status of the NTS 03-G+ to the active primary
reference source. The primary reference source could be GNSS, PTP, NTP or IRIG-B.
LED Indicators Table 3 – SYNC LED
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 flash per
second)
The NTS 03-G+ is operating in the “holdover” state (holdover timer
running) or is operating in the “tuning” state (time server is gaining
synchronization)
Fast Flash (5 flashes per
second) The NTS 03-G+ is not synchronized. “Out of Sync” condition
The ALM LED indicates the internal alarm status of the NTS 03-G+. It has only two operating
states: -
LED Indicators Table 4 – ALM LED
State
Description
Off
The NTS 03-G+ is operating normally, i.e., there are no alarms
Fast Flash (5 flashes per
second)
At least one alarm is active. Refer to the alarm window in the Clock
tab of the Configuration Tool to find the name of the active alarm(s).
A shorthand version of the alarm name will also appear on the LCD.
Refer to the - Alarm Definitions table below for the details on each
alarm by name.
Table 5 - Alarm Definitions

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LCD Alarm
Alarm Name
Specification
PwrA
No Power A
No power source is detected on power inlet A.
PwrB
No Power B
No power source is detected on power inlet B.
Sats
Satellites Low
The number of satellites currently being used for time and position
calculations is below the threshold.
Sync
No Sync
The NTS 03-G+ is not synchronized to any source, or the holdover period
has expired, or the timing output inaccuracy has been exceeded.
Hold
Holdover
The NTS 03-G+ has lost sync and is now in holdover.
AntL
No Antenna
The antenna circuit current drain is low (typically under 3mA). This could be
caused by:
•poor connections
•the connected antenna having a lower current drain specification
•
a component in the antenna system providing power to the antenna
and therefore the time server is not seeing a connected load
•
there being no antenna connected
AntH
Antenna
Short
The antenna circuit current drain is high (typically over 100 mA). This is
caused by a short in the antenna circuit, or by moisture ingress in the
circuit, or if the antenna connected has a higher current drain specification.
N/A*
Antenna
Fault
This alarm is generated if there is high current or low current detected on
the antenna input.
Factory Reset
Cycle Power
Factory Reset
Armed
This alarm is generated if the Forgotten Password Reset (Factory Reset
Process) is enabled and has been initiated by the user.
IRIG
No IRIG-B
Input
No valid IRIG-B source is detected on the NTS 03-G+ input. (This alarm only
appears if the NTS 03-G+ has IRIG-B monitoring enabled).
N/A*
ETHx Link A
Down
This message appears when the NTS 03-G+ has a PRP link enabled on ETH2
with ETH3 and/or ETH5 with ETH6, and there is no link on ETH2/ETH5. This
could be caused by an unplugged cable, or an unpowered network switch
connected to PRP port A.
N/A*
ETHx Link B
Down
This message appears when the NTS 03-G+ has PRP link enabled on ETH2
with ETH3 and/or ETH5 with ETH6, and there is no link on ETH3/ETH6. This
could be caused by an unplugged cable, an unpowered network switch
connected to PRP port B.
N/A*
Overcurrent
The time server supports output current monitoring and has detected
excessive current on one or more outputs. Check the I/O tab to identify
which output is experiencing the fault.

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LCD Alarm
Alarm Name
Specification
IPeX
ETHx Address
Fault
This alarm comes up when the DHCP server is unavailable or when the IP
address is assigned to some other node in the network and cannot be
assigned to the port. Under such situations the port defaults to a link local
address.
eX represents the port number which has the alarm. For example, IPe1
indicates address fault alarm on ETH1.
SYNC FORCED
ON
Sync Forced
This alarm is generated when the “Never leave Sync (Test Mode)” option has
been selected.
*Note: N/A indicates that this alarm does not appear on the LCD
Admin (USB) Port
A second 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.support.tekron.com. The NTS 03-G+ can be configured using
USB only configuration to add an extra security layer.

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3. BACK PANEL
Examples of NTS 03-G+ back panels are shown (see Figure 12 - Figure 15). Their appearance will
vary when fiber Ethernet ports are fitted, or the fiber slave option is selected.
Figure 12 – Rear panel of NTS 03-G+, 3 Port Option
Figure 13 – Rear panel of NTS 03-G+, 6 Port Option
Figure 14 – Rear panel of NTS 03-G+, 4 Port with BNC IRIG-B outputs
Figure 15 – Rear panel of NTS 03-G+, 4 Port with ST fiber outputs
P1A / P1B: Power Input(s)
Power is applied to the unit via P1A and/or P1B (when fitted – dual
power supply option). The NTS 03-G+ can be ordered with high voltage
AC/DC supplies, high voltage DC supplies or medium voltage DC
supplies, or a combination. IEC-320 power connectors (shown to the
left – P1A) are used for high voltage AC or DC, and 5.08 mm 2-pin
connectors are used for low, medium or high voltage DC. The polarity of DC power sources is
not important as both the unit and case are isolated from the supply inputs. This enables the
use of positive earth, negative earth or fully floating DC power sources. If either of the power

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supplies fails, the time server will remain operational provided that each power supply is
powered from a different source.
The input voltage range is marked below the P1A/P1Bconnectors. Refer to Power Supply
Options section, which lists the available power supply options and input voltage ranges that
can be ordered.
Check the label on the side of the unit for power supply voltage ratings before
powering the unit.
If IEC connectors are used, then a 1 A, 250 Vac 5x20 mm glass or ceramic slow blow
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 (bonded to chassis) are provided for earthing. It is recommended
that one of the two bolts is bonded to earth using a cable terminated with a ring
terminal. This provides a safe discharge path in the event of a short circuit or high
voltage transient.

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4. BACK PANEL – INPUTS AND OUTPUTS
Ant: Antenna Connector (SMA Connector)
The “ANT” antenna input provides an interface for an external active antenna.
The antenna should be connected using a high quality, low-loss 50 Ω coaxial
cable. The center conductor supplies 5 VDC (100 mA max) to power an active
antenna.
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 only. Do NOT over-tighten! Ensure the antenna SMA male connector center pin
is straight before plugging in.
Antenna Cable Considerations
The NTS 03-G+ antenna port expects a signal with a gain of at least 15 dB, and no more than 35
dB, with 20 - 35 dB being the optimal gain range.
All antenna cables will introduce some signal loss in the antenna installation system, which will
be dependent on cable length. The total gain of the antenna installation should fall within the
ranges specified below. The total gain is calculated by the gain of the antenna (Tekron supplied
antenna provides 40 dB gain) minus the antenna cable loss.
Figure 16 Recommended antenna cable loss range
Note: The above figures are based on an average GNSS signal strength of -130 dBm at sea level,
and assumes that the Tekron supplied antenna is used.

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CNT-240
32.8 dB/100 m (10dB/100ft). Plus 1 dB/connector
Approximate optimum length range: 15m to 60m
(50 ft – 197 ft)
Approximate maximum length range: 15m to 76m
(50 ft – 250 ft)
CNT-400
16.73 dB/100 m. Plus 1 dB/connector
Approximate optimum length range: 30m to 120m
(99 ft – 394 ft)
Approximate maximum length range: 30m to 150m
(99 ft – 493 ft)
A lightning protection device should be inserted into the antenna lead. A suitable device,
complete with additional cable connectors, a connector crimping tool and mounting hardware
is available as an option. The introduction of the lightning protector introduces an additional
loss of 0.1 dB and the loss of two connectors.
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 only. DO NOT OVER TIGHTEN!
P2: IRIG-B Input (3-pin 3.81 mm Connector)
This port accepts an RS422 level un-modulated IRIG-B signal of the following formats:
•IRIG-B004 with C37.118.1 extensions
•IRIG-B005 with C37.118.1 extensions
•IRIG-B006*
•IRIG-B007*
*Note: When no extensions are contained in the incoming IRIG-B signal, the incoming time is
assumed to be UTC.
When configured appropriately, the NTS 03-G+ can synchronize to this source rather than the
internal GNSS receiver, operating as a slaved device from another master source or other time
server.
A 120 Ω twisted pair cable is recommended for the incoming RS422 line.
The incoming RS422 line should be connected to pins “+” and “-” of the mating connector. An
RS422 termination load is provided on pin “T” and can be activated by linking pins “T” and “-” in
the mating connector.

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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

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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 “Sync Hold” mode for a period
defined by the “Sync Hold time”.
At the expiry of the “Sync Hold time”, the alarm condition is again activated (contact open).
Note that the “Sync Hold Time” is configurable up to a maximum of 970 days. The default
setting is 2 minutes. A configurable option is also provided to disable the “Sync Hold Time”,
allowing the unit to remain in “Sync Hold” mode indefinitely.
P5: Power Alarm Relays (4-pin 3.81 mm Connector)
The pluggable connector provides two alarm output channels. Wiring size is up
to 1.00 mm². 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 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.
In the case that all power to the time server is lost, all the alarm relays then default to the
“alarm” state (open contact). The “+” and “-” symbols are included for reference 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. The power alarms will only be
triggered if it is enabled in the Tekron configuration Tool. Alarm signaling is delayed by 10
seconds. That is, if power supply A fails, the Power A alarm contact will open 10 seconds1later.
ADMIN/ETH 1: Ethernet Administration Port (RJ-45)
The Ethernet administration port (ETH1) features an RJ-45 connector and
supports 10/100 Mbps, Auto MDI-X and Auto Negotiate. The port indicator
LEDs conveys the Link (LNK) and Activity (ACT) status for the port. This port is
used to configure clock settings and all network ports via the Tekron
Configuration Tool, which is available for download from the Tekron website at
www.support.tekon.com.

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ETH 2 – ETH 6: Ethernet Communication Ports (RJ-45/ST Fiber Connector)
The Ethernet communication ports (ETH2 – ETH6), feature an RJ-45
connector that supports 10/100 Mbps, Auto MDI-X and Auto
Negotiate, or ST Fiber (100 Mbps) connectors (if Fiber option is
ordered). These ports include indicator LEDs which convey Link (LNK)
and Activity (ACT) status for the associated port.
Note: ST Fiber Ethernet ports are not an orderable option for the NTS 03-G+ 4 port and 6 port
options with the advanced OCXO oscillator.
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 1588-2008 default profiles or C37.238 power profile.
Note:
At no time will the NTS attempt to operate as an Ethernet router, switch or hub.
P6 – P9: Programmable Output (50 OHM BNC connector/ ST Fiber connector)
These ports can be ordered as either four BNCs (copper, 5 V, 150 mA) or as four ST Fiber
transmitters.
Figure 17 – BNC Connector Figure 18 – ST Fiber Connector
These ports provide high drive, isolated TTL outputs. Each output can be uniquely programmed
through the Tekron 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.

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The user may configure these outputs in either inverted or non-inverted polarity with:
•A configurable number of pulses per second, minute, hour, day with adjustable pulse-
width and offset
•IRIG-B code (un-modulated DCLS or Modified Manchester) with option C37.118.1 or
AFNOR extensions.
•DCF77 receiver time code simulation