Tekron TCG 01-G User manual

Sixth Edition – Copyright ©2021
TCG 01-G
USER MANUAL

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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 ....................................................................................................................... 5
1.1 Product Overview ............................................................................................................................... 5
1.2 Hardware ............................................................................................................................................ 5
1.3 Configuration ...................................................................................................................................... 6
1.4 Accessories .......................................................................................................................................... 6
2. FRONT PANEL........................................................................................................................... 7
LCD Display ................................................................................................................................................ 7
Contrast Adjustment Mode ................................................................................................... 10
LED Indicators ......................................................................................................................................... 11
Alarm Messages ...................................................................................................................................... 12
3. BACK PANEL ........................................................................................................................... 13
P1: Power Input (2-pin Connector [5.08 mm]) ....................................................................................... 13
Earth Stud (M4 Nut) ................................................................................................................................ 13
4. BACK PANEL – INPUTS AND OUTPUTS .................................................................................. 14
ANT: Antenna Connector (SMA Connector) ........................................................................................... 14
Antenna Cable Considerations: ............................................................................................. 14
P2, P3: Programmable Outputs (2-pin [3.81 mm] / BNC or ST Fiber) ..................................................... 16
Electrical and Physical Configuration .................................................................................... 16
If an output is not being used, it may be left unconnected. The dust cap should remain in
place on unused fiber connectors. ........................................................................................ 16
P2, P3 Programmable Output Options .................................................................................. 16
P4: Serial Port and Programmable Output (DB9 Connector).................................................................. 17
P4 Serial Strings ..................................................................................................................... 17
P4 pin 1 Programmable Output ............................................................................................. 18
P5: AM IRIG-B Output (BNC Connector) ................................................................................................. 18
P6: Event Recording / IRIG-B Sync Inputs (4-pin 3.81 mm Connector) .................................................. 19
P7: Sync Relay (4-pin 3.81 mm Connector) ............................................................................................. 19
ADMIN/ETH1: Ethernet Communication Port (RJ-45 Connector) .......................................................... 20
5. SOFTWARE ............................................................................................................................. 21
Configuration Tool .................................................................................................................................. 21

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6. INSTALLATION ........................................................................................................................ 22
Identification ........................................................................................................................................... 22
Mounting the TCG 01-G .......................................................................................................................... 22
Operation ................................................................................................................................................ 22
Event Recording Function ....................................................................................................................... 24
General Description and Specification .................................................................................. 24
P6 Input Function (IRIG-B / Event Recording) ......................................................................................... 24
7. FACTORY RESET ..................................................................................................................... 26
8. FACTORY HARDWARE OPTIONS ............................................................................................ 27
Power Supply Options ............................................................................................................................. 27
High Voltage (MOSFET) Output Option .................................................................................................. 27
Lightning Protection Option .................................................................................................................... 28
General .................................................................................................................................. 28
Installation ............................................................................................................................. 29
Disclaimer .............................................................................................................................. 29
9. APPENDIX ............................................................................................................................... 30
TCG 01-G Specifications .......................................................................................................................... 30
Physical Specifications ........................................................................................................... 30
GNSS Receiver ........................................................................................................................ 30
Input and Output Specifications ............................................................................................ 30
Environmental Specifications ................................................................................................ 31
Electrical Specifications ......................................................................................................... 31
ISOLATION AND PROTECTION ................................................................................................................. 31
SERIAL OUTPUT STRINGS ........................................................................................................................ 34
NGTS Time Code O/P on P4 ................................................................................................... 34
IRIG J-17 Time Code O/P on P4 .............................................................................................. 35
String-A Time Code O/P on P4 ............................................................................................... 36
String-B Time Code O/P on P4 ............................................................................................... 37
String-C Time Code O/P on P4 ............................................................................................... 38
String-D Time Code O/P on P4 ............................................................................................... 39
String-E Time Code O/P on P4 ............................................................................................... 40

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String-F Time Code O/P on P4 ............................................................................................... 41
String-G Time Code O/P on P4............................................................................................... 42
String-H Time Code O/P on P4 ............................................................................................... 44
NMEA ZDA Time Code O/P on P4 .......................................................................................... 45
NMEA RMC Time Code O/P on P4 ......................................................................................... 46
IRIG-B Specification ............................................................................................................... 47
Event Recording Specification ................................................................................................................ 48
Tag Data ................................................................................................................................. 48
Tag Storage ............................................................................................................................ 48
Tag Retrieval .......................................................................................................................... 48
TCG 01-G Command / Response Message structure ............................................................ 48
TCG 01-G Commands related to Event Time Tagging ........................................................... 49
Ps command: Get Status........................................................................................................ 49
Notes concerning the Ps command: ...................................................................................... 50
Pc command: Clear Time-Tag Buffer ..................................................................................... 50
Pt command: Get next Time-Tag ........................................................................................... 50
Pr command: Repeat last Tag Sent ........................................................................................ 51
10. WARRANTY......................................................................................................................... 52

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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.
1. INTRODUCTION
Welcome to the TCG 01-G user manual! This document contains everything you need to know
about the key features, hardware, and installation process of the TCG 01-G.
1.1 Product Overview
The TCG 01-G Time Code Generator produces precision time code signals, serial strings and
pulses for use in synchronizing industrial control and SCADA equipment.
The clock is ideally suited to providing time synchronization simultaneously to many different
devices, such as Phasor Measurement Units (PMUs), Protection Relays, Remote Telemetry Units
(RTUs) and other Intelligent Electronic Devices (IEDs) used in electrical sub-stations and
industrial control installations.
1.2 Hardware
The TCG 01-G features one amplitude modulated (AM) IRIG-B output and three user-
programmable outputs, including a serial port. The serial port is user-configurable to output
serial strings and report event data for units fitted with event recording capability.
Factory options include a choice of physical connectors: BNC, 2-pin plug and socket, or ST Fiber.
Non-fiber outputs can be ordered as TTL, RS422/485, or high voltage switching.
All TCG 01-G units feature a front panel display (Figure 1) giving visual feedback about the time
data being generated on the outputs. LED indicators provide “at a glance” status information.
Figure 1 – TCG 01-G chassis and front panel
The optimized receiver/antenna system used by TCG 01-G obtains time with near-atomic clock
precision from the available Global Navigation Satellite Systems (GNSS). The result is output
timing accuracy similar to that normally seen only in laboratory instruments.
However, unlike laboratory instruments, the TCG 01-G is suited for hostile electromagnetic
environments such as sub-stations and electrical switchyards. Each output of the TCG 01-G is
isolated from every other output, so that attached wiring can feed out to operating areas in
different earth potential zones without compromising the overall site earthing security. In
addition, isolation protects the internal electronics from longitudinal transient voltages and
transient suppression devices protect from transverse transient voltages.

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1.3 Configuration
The TCG 01-G features a 10/100 Mbps Ethernet port through which the unit can be configured.
Firmware license options include a stratum 1 NTP server and IEEE 1588-2008 functionality.
When the IEEE 1588 (PTPv2) option is enabled, the unit can operate as a PTP grandmaster, an
ordinary PTP clock, or a slave-only clock.
1.4 Accessories
The TCG 01-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 and lightning protection kit.

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2. FRONT PANEL
Figure 2 – TCG 01-G front panel
TCG 01-G features two LED indicators on the front panel (Figure 2), together with a 2-line by 16-
character backlit LCD display.
SYN LED: This LED shows the status of the current sync source.
ALM LED: This LED shows the alarm status of the TCG 01-G.
LCD Display
On initial power-up, the LCD display shows a copyright message, along with the serial number
and firmware version of the unit. See 3 - Start Up (Clock ID).
After power-up, if the TCG 01-G is configured to operate in its default mode (GNSS
synchronized), the display changes automatically to indicate that it is waiting for satellites
(Figure 4).
Once one or more satellites have been discovered, it transitions to the operating default display
(Figure 5).
Figures 6 and 7 show alternative time displays that the user can access by pressing the button
on the front panel between the LED indicators. Successive button presses can be used to cycle
through all the display screens in turn. Examples of the display screens are shown below.

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3 - Start Up (Clock ID) 4 – Waiting for Satellites
5 – Operating Default 6 – Local Time
7 – UTC Time 8 – Alarm
9 – IP Address
“UTC” is short for Coordinated Universal Time (approximately equivalent to GMT). The top line
of the screen in Figure 5 shows the clock’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 clock 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 6 changes to “LDT”, denoting Local Daylight Time.
Figure 7 shows the UTC time and date which is 11:16:53 on the evening of Monday the 17th of
March 2010.
Figure 8 shows that an antenna current low alarm is active. All active alarms will be displayed in
the same way. Up to three alarms can be displayed simultaneously. If more than three alarms
are active, only the three highest priority alarms will be shown. Refer to Table 5 below for a
description of all possible alarms.
Figure 9 shows the IP address of the ADMIN/ETH1 network port. In this example, it shows the
port has been configured with a fixed/static IP address of 192.168.96.10.
The display screens in Figures 4, 5, 6, 7, and 8 each show a three-character status field at the
bottom right-hand side of the display. This three-character field provides feedback on the
parameters that affect the operation of the GNSS receiver.
TCG01G
Ver
F2.30
(C) 2014 Sn18748
WAITING FOR SATS
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
075
23:16:53
87A
*** A
ntL
***
075
23:16:53
87A
Fixed:
192 . 168 . 096 . 010

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When the TCG 01-G is synchronized to a source other than GNSS, this field directly indicates the
alternate sync source being used by the TCG 01-G. Table 2 shows the alternate sync sources
supported by the TCG 01-G.
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 TCG 01-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 sufficient GNSS synchronization for the TCG 01-G
to recommence normal operation (Position hold).
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 clock will
indicate the “out of sync” condition.
Receiver
status
“A”
TCG 01
-
G
is
in Acqui
ring
mode
-
attempting to get satellite
fixes.
“G”
“Poor satellite geometry”: Satellites are positioned in almost a
straight line, so the best accuracy cannot be obtained, but the
unit will still sync to UTC.
“S”
A
Site Survey
is
in progress.
The
TCG 01
-
G is calculating an
accurate position. Once complete, the mode will change to
Position hold.
“P”
“Position hold”: The position is known accurately, and the
GNSS reference is providing its most accurate time, typically
better than 40 ns to UTC.
Satellites in sky
Satellites tracked
Receiver status
LST: TUE 17MAR10
076 11:16:53 87A
LST:
TUE 17
MAR10
076
11:16:53
SL1

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Table 1 – GNSS Status
Character Values Description
Alternate
Sync Source
“SL1” Clock is synchronized to an IRIG-B source on P6A input “Slave:
copper 1”
"SL2" Clock is synchronized to an IRIG-B source on P6B input “Slave:
copper 2”
“SLF”
Clock is synchronized to an IRIG-B source on the Fiber input
“Slave: Fiber”. This sync source only exists for the “Fiber Slave”
variant of the TCG 01-G, which has an ST Fiber input in place of
the antenna connector.
“PTP”
Clock is synchronized to a Precision Time Protocol (PTP) master
clock.
“NTP”
Clock is synchronized to a Network Time Protocol (NTP) server.
“TST”
Clock is operating with manually set time (Test Mode). Please
refer to configuration tool “Set Time” function for further
details
Table 2 – Alternative Sync Source
If the TCG 01-G is configured with GNSS disabled, or is a “Fiber Slave” variant, then
“SL?” will be displayed in the status field if there is no available IRIG-B, PTP, or NTP
source.
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 operation after this.

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LED Indicators
The SYN LED shows the status of the sync source. The various states are as follows:
State Description
off The TCG 01-G has no power.
on The TCG 01-G is synchronized to the source indicated by the LCD
display.
Slow Flash (1 per second)
The TCG 01-G is operating in the “holdover” state (holdover timer
running)
Fast Flash (5 per second) The TCG 01-G is not synchronized. “Out of Sync” condition.
Table 3 – SYN LED
The ALM LED indicates the internal alarm status of the TCG01-G. It has only two operating
states:-
State
Description
off
The
TCG 01
-
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 8 above).
Table 4 – ALM LED

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Alarm Messages
When an alarm condition is active, a four-character message is shown on the top line of the
LCD, replacing the normal date information (see example in Figure 8 above). The possible alarm
messages are shown below:
LCD Alarm
Alarm Name
Description
Hold
Holdover
The TCG 01
-
G is operating in the “hold
over” state (
Hold
over
timer running).
Sync
No Sync
The TCG 01
-
G
is not synchroni
z
ed to any source and
holdover period has expired.
AntL No Antenna The antenna circuit current drain is low (typically under 3mA). This could be
caused by poor connections, or if the connected antenna has a lower current
drain specification or if a component in the antenna system is providing power to
the antenna and therefore the clock is not seeing a connected load.
AntH
Ant
enna
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 draw specification.
IRIG No IRIG-B
Input
IRIG-B monitoring is enabled on the P6A and/or P6B input, and a valid IRIG-B
signal is not present on that input.
IPe1 IPv4 Address
Fault on
ETH1
The clock has failed to obtain an IPv4 address via DHCP, or has detected an IP
address conflict, and has adopted an ARP tested Link-Local address
(169.254.xxx.xxx).
When this alarm occurs, the user may need to update their network adapter
settings to a Link-Local address to gain access to the clock.
The alarm will persist until the IPv4 address settings are changed or the clock is
connected to a DHCP enabled network.
FRP Armed
Press Again
to Disarm
Factory
Reset
Procedure
(FRP) Armed
This message appears on the LCD, in place of all other text, when the Factory
Reset Procedure is initiated by the user. The Factory Reset Procedure is used to
reset the TCG 02-G to factory default settings in the case of a lost or forgotten
administrator password, or configuration error that renders the TCG 02-G
inaccessible. Refer to the Tekron Configuration Tool Manual for further
information.
Table 5 – Alarm Messages

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3. BACK PANEL
An example TCG 01-G back panel is shown in Figure 5 below. Its appearance may vary, as
different connector types can be fitted at the factory to suit your requirements.
Figure 5 – Rear panel of TCG 01-G, configured with 2-pin connectors (P2 and P3)
P1: Power Input (2-pin Connector [5.08 mm])
Power is applied to the unit via this plug. Maximum steady state power
consumption is 6 W, and surge protection is provided. A mating connector is
supplied that is suitable for wiring up to 1.5 mm2.
The polarity of the DC power source is not important as both the unit and case are
isolated from the supply input.
Check the label on the base or side of the unit for the power supply voltage rating
before powering the unit.
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 Stud (M4 Nut)
Located under the serial port, to the left of the P4 designator is a M4 bolt
provided for earthing. An external ground connection must be connected to
ensure appropriate grounding for the unit. 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” port is the GNSS antenna input port. The antenna port provides an
interface for an external active antenna via low-loss coaxial cable.
A 50 Ω impedance cable should be used with the port.
5 V DC at 50 mA max is supplied to power an active antenna.
If the Fiber Slave option is ordered, the antenna is replaced by a fiber input port.
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 Tekron antenna port expects a signal with at least 15 dB of gain, and no more than 35 dB of
gain, with 20-35 dB being the optimal gain range.
The Tekron supplied antenna delivers 40 dB of gain into the antenna cable, hence the loss of the
antenna cable in the installation should fall within the ranges specified below.
Note: The above figures are based on an average GNSS signal strength of -130dBm at sea level,
and they assume that the Tekron supplied antenna is used (the Tekron supplied antenna is
recommended).
CNT
-
240
32.8 dB/100 m (10dB/100ft). Plus 1
dB/connector
Approximate optimum length range: 15 to 60
meters
Approximate maximum length range: 15 to 76
meters
CNT-400 16.73 dB/100 m. Plus 1 dB/connector

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Approx
imate o
ptimum
l
ength
range
: 3
0
to
120
meters
Approximate maximum length range: 30 to 150
meters
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 approximately 2 dB of connector loss.

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P2, P3: Programmable Outputs (2-pin [3.81 mm] / BNC or ST Fiber)
Electrical and Physical Configuration
Each output port may be fitted at the factory according to the following:
Electrical Electrical Specification Physical
TTL
CMOS/TTL (5 V) logic level driver output ports, 150 mA sink and
source. The port is fully floating and has independent electrical
isolation to 2.5 kV.
2-pin
or BNC
RS422
High Speed RS422/485 (5 V differential) output ports. The port
is fully floating and has independent electrical isolation rated
to 2.5 kV.
2-pin
HV MOSFET
Power MOSFET Switch, allowing switching of 300
VA,
100
m
A
max. The port is fully floating and has independent electrical
isolation rated to 2.5 kV. Refer to Figure 11 for the suggested
wiring configurations for use with Power MOSFET switching.
2-pin
Fiber ST fiber transmitters, compatible with ST-terminated multi-
mode fiber optic cabling. (λ=820 nm) ST Fiber
Examples of the three connector types are given in (Figure 6) to (Figure 8);
Figure 6 – 2-pin connector Figure 7 – BNC connector Figure 8 – Fiber connector
If an output is not being used, it may be left unconnected. The dust cap should remain in place
on unused fiber connectors.
P2, P3 Programmable Output Options
The user may configure P2 and P3 to output in either inverted or non-inverted polarity:
 A configurable number of pulses per second, minute, hour, or day with adjustable pulse
width and offset.
 IRIG-B time code (unmodulated DCLS or modified Manchester) with optional IEEE
C37.118.1 or AFNOR NF S87-500 extensions.
 Simulated DCF77 receiver time code.
Refer to the Tekron Configuration Tool Manual for further information.

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P4: Serial Port and Programmable Output (DB9 Connector)
The TCG 01-G is normally shipped with a DCE configuration on P4, so
that a “straight-wired” socket-to-socket 9-way data cable can be used
to connect it directly to a standard PC serial port.
As the serial outputs are usually precisely timed messages, there is no
provision for either hardware or software flow control.
Do NOT over-tighten the securing screws of the connector!
The following signals are present on P4 (DCE configuration only):
 Pin 1: RS232 level (-9V to +9V) programmable output.
 Pin 2: RS232 level serial string.
 Pin 5: RS232 signal ground.
 Pin 4 and Pin 6: RS422 level (-5V to +5V) differential programmable output (same
content as Pin 1).
 Pin 8 and Pin 9: RS422 level serial string (same content as Pin 2).
The RS232/RS422 signal lines are not isolated from each other, but the port as a whole has an
isolation rating of 2.5 kV from all other ports.
Any P4 pins that are not being used may be left unconnected.
P4 Serial Strings
The serial port can be configured to output any one of a number of different serial time
messages on a broadcast basis. The serial port runs at a user configurable data rate between
1200 and 38400 bps (available rates are 1200, 2400, 4800, 9600, 19200 and 38400 bps). The
default message format operates at 9600 baud, 8-bit with no parity, no flow control and 1 stop
bit. Most messages are transmitted once per second.
A wide range of message strings and protocols can be output on this port. They include:
 NGTS protocol (transmits once per minute)
 IRIG J-17 (IRIG Standard 212 Format J-1x)
 Eight pre-set messages, Tekron Strings A – H for compatibility with most IEDs.
 NMEA ZDA and RMC messages
 GNSS binary/raw messages, these are subject to change without notice.
See Appendix (SERIAL OUTPUT STRINGS) for details on each of the message string formats.
A common application for the programmable output on P4 pin 1 (RS232 level) is to provide an
independent drive to an RS232-Fiber converter unit for use in transporting time code/pulse
signals to a distant location. In such cases, pin 1 should be “broken out” of the 9-way cable
optionally used to connect to an external PC, and used in conjunction with pin 5 (signal return).

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P4 pin 1 Programmable Output
The user may configure the P4 pin 1 output to operate with inverted or non-inverted polarity,
and:
 A user-configurable number of pulses per second, minute, hour, or day with adjustable
pulse width and offset.
 IRIG-B time code (unmodulated DCLS or modified Manchester) with optional IEEE
C37.118.1 or AFNOR NF S87-500 extensions.
 Simulated DCF77 receiver time code.
Refer to the Tekron Configuration Tool Manual for further information.
P4 pin 1 is not available on TCG 01-G with DTE serial port. If not specified, TCG 01-G
will ship with a DCE serial port.
P5: AM IRIG-B Output (BNC Connector)
P5 provides AM IRIG-B (B12x) over a BNC connector. This output is not
programmable for other types of signal and a 1 kHz carrier is present whenever
the unit is powered. The IRIG-B data content is as specified by the Tekron
Configuration Tool program.
Use either a coaxial cable or a shielded twisted pair cable to feed the signal from
P5 to any connected IEDs. When using shielded twisted pair, connect the shield
to ground.
The mark/space amplitude modulation ratio is 3:1, and peak to peak output level is 8 V (max),
120 Ω impedance. The output is fully floating, and is transformer-isolated to 3.75 kV.
If the P5 output is not being used, it may be left unconnected.
Most devices with amplitude-modulated IRIG-B time sync inputs have an input
impedance of between 4 kΩ and 20 kΩ, and a maximum allowable peak-to-peak
level of approximately 6 V.
The P5 output on the TCG 01-G is designed to drive multiple devices in parallel, with
a terminating resistor (typically 100-180 Ω) fitted at the far end of the coax line
feeding the attached loads.
With this configuration, P5 can drive at least 20, and typically 30 or more devices
(dependent upon layout, device input impedance, etc.), without any external
amplification. The terminating resistor is essential to ensure good noise immunity
and the correct voltage levels.

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go to www.tekron.com.
P6: Event Recording / IRIG-B Sync Inputs (4-pin 3.81 mm Connector)
The pluggable connector provides two input channels that may be driven by
TTL sources. The input can be either be configured for a pulse for event
recording or for receiving un-modulated IRIG-B – IRIG-B004 with C37.118.1
extensions only. This option allows IRIG-B to be used as a secondary sync
source.
The input type is software configurable. If both event recording and IRIG-B sync input functions
are selected, then channel ‘A’ is the Event Input and channel ‘B’ is the IRIG-B sync input.
The expected input is 5 V, 7 mA, however inputs up to 10 V, 20 mA may be applied. The ‘+’ and
‘-’ symbols represent the positive and negative terminals respectively. The supported wiring
size is up to 1.00 mm².
The two ports are isolated from the rest of the system by a 2.5 kV barrier and the ports have a
60 VDC isolation from each other. Each input is protectively clamped to 25 V and uses a 470 Ω
resistor to limit the current.
Refer to the Event Recording Specification section of this manual for further information on the
event recording feature.
P7: Sync Relay (4-pin 3.81 mm Connector)
P7 provides two alarm output channels.
P7 A is the GNSS signal receive fail (Antenna fail) alarm. The antenna alarm
only occurs after a continuous 5 seconds with the antenna disconnected or
short-circuited.
P7 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.
The alarm outputs are Type A (normally-open) dry contact types (implemented using solid state
relays).
Note: the “Normally-Open” descriptor refers to the de-energized state of the relay.
The TCG 01-G operates with the alarm relays energized during normal operation, and de-
energized in the alarm state. In the case of all power to the clock being lost, all of the alarm
relays will default to the “alarm” state (open contact).
The “+” and “-” symbols are included for reference purposes only, as the alarm contacts are not
polarized. The supported wiring size is up to 1.00 mm², and the contact rating is 200 V, 150 mA
DC or 150 V, 100 mA AC.

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go to www.tekron.com.
ADMIN/ETH1: Ethernet Communication Port (RJ-45 Connector)
The Ethernet port (ETH1) features a RJ-45 connector and supports
10/100 Mbps, Auto MDI-X and Auto Negotiate. The LEDs convey Link
(LNK) and Activity (ACT) status for the port.
The LNK LED will be illuminated when an Ethernet link has been
achieved with a link partner, whilst the ACT LED will be illuminated when there is activity on
either the transmit or receive pair.
This port is also used to configure the clock via the Tekron Configuration Tool, which is available
for download on the TCG 01-G page on the Tekron website at https://tekron.com/power/gnss-
timing-generator-tcg01g/#resources.