Masibus GPS MASTER CLOCK MC-1-M User manual

Masibus Automation And Instrumentation Pvt. Ltd.
B/30, GIDC Electronics Estate,
Sector-25, Gandhinagar-382044, Gu arat, India
 [phone]  [phone]
Email: [e-mail]
Web: www.masibus.com
User’s Manual
GPSmas
masmas
masTER CLOCK

Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual Page 2 of 103
LIMITED WARRANTY
Masibus Automation and Instrumentation Pvt. Ltd. Provides limited warranty for its manufactured
product against the defects in material shipped, workmanship under normal use and service for the
period of 12 months or as per the warranty period terms agreed, from the date of shipment of
product. This warranty shall not apply if the product is used contrary to the instructions in its manual
or is otherwise subject to misuse, abnormal operations, accident, lightning or transient surges,
repairs or modifications not performed by Masibus Automation and Instrumentation Pvt. Ltd.
Necessary items packed with GPS Master Clock such as antenna, lightening arrestor, antenna line
amplifier and other accessories are also provided with limited warranty of 12 months from the date
of shipment.
Masibus Automation and Instrumentation Pvt. Ltd. Obligation under this warranty are limited to in-
factory service and repair, of the product or the component thereof, which is found to be defective. If
the defect for which Masibus Automation and Instrumentation Pvt. Ltd. Is found not responsible for
the defect or the cause of defect in product, the service or repair will be done on the charge basis.
For warranty service or repair, products if returned to a service facility at Masibus Head Office, buyer shall
prepay all shipping charges to Masibus. Masibus highly recommends that prior to returning equipment for
service work, our technical/Customer support department be contacted to provide trouble shooting
assistance while the equipment is still installed.
EXCEPT FOR THE LIMITED WARRANTY STATED ABOVE, MASIBUS AUTOMATION AND
INSTRUMENTATION PVT. LTD. DISCLAIMS ALL WARRANTIES OF ANY KIND WITH REGARD TO ITS
PRODUCTS OR OTHER MATERIALS PROVIDED BY MASIBUS, INCLUDING WITHOUT LIMITATION
ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Masibus Automation and Instrumentation Pvt. Ltd. shall have no liability or responsibility to the original
customer or any other party with respect to any liability, loss, or damage caused directly or indirectly by its
product, material, or software sold or provided, replacement parts or units, or services provided, including
but not limited to any interruption of service, excess charges resulting from malfunctions of hardware or
software, loss of business or anticipatory profits resulting from the use or operation of the Masibus
product or software, whatsoever or howsoever caused. In no event shall Masibus be liable for any direct,
indirect, special or consequential damages whether the claims are grounded in contract, tort (including
negligence), or strict liability.

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Contents
1. Unpacking GPS Master Clock model MC-1………………………………………………………. 08
1.1 Standard Items…………..……………….……………………………………………………... 08
1.2 Optional Items……………………………………………………………………………………... 08
2. Introduction……………………………………………………………………………………………..09
3. GPS Fundamentals…………………………………………………………………………………… 10
4. GPS Specification…………………………………………………………………………………….. 12
4.1 Mechanical Dimensions Layout………………………………………………………………... 17
5. Unit Front and Rear panel Description………………………………………………………….....18
5.1 GPS Master Clock Front Panel……………………………………………………………... 18
5.2 GPS Master Clock Rear Panel……………………………………………………………… 19
6. GPS Master Clock model MC-1-M Installation……………………………………………………24
6.1 GPS Antenna Installation……………………………………………………………………. 25
6.1.1 GPS Antenna Installation……………………………………………………………. 25
6.1.2 Mounting the Antenna………………………………………………………………...26
6.1.3 Verifying Antenna and Cable Operation…………………………………………....28
6.1.3.1 Checking the Antenna Voltage…………………………………………..28
6.1.3.2 Power Supply Check……………………………………………………...28
6.1.3.3 Checking the Antenna Resistance……………………………………... 28
6.1.4 Antenna Surge Suppressor…………………………………………………………..29.
6.1.5 Technical Details on GPS Antennas and Cable…………………………………...29
6.2 Unit Installation……………………………………………………………………………….. 30
6.3 Wiring Diagram………………………………………………………………………………... 31
7. Hardware Jumper Setting…………………………………………………………………………….32
7.1 Relay Contact Output Configurations…………………………………………………….. 33
7.1.1 POWER relay contacts……………………………………………………………….33
7.1.2 GPS LOST relay contacts…………………………………………………………… 34
7.1.3 WATCHDOG relay contacts………………………………………………………… 34
7.2 COM1 terminal RS232 / RS485 Output Configurations………………………………… 34
7.3 COM2 terminal RS232 / RS485 Output Configurations………………………………… 35
8. GPS Master Clock model MC-1-M Power ON……………………………………………………..36
8.1 Receiver Boot-up mode……………………………………………………………………… 36
8.2 Battery Backup RTC and GPS receiver RAM Configurations………………………… 37
8.3 Startup Operation…………………………………………………………………………….. 37
8.4 Basic Normal Run Mode Operation……………………………………………………….. 39
9. Unit Setup Configuration……………………………………………………………………………..42
10. Serial Communication and Configuration………………………………………………………...45
10.1 Serial Port Setup and Serial Cable Configuration………………………………………. 45
10.2 Configuration Commands…………………………………………………………………... 48
10.2.1 General Commands…………………………………………………………………..48
10.2.2 Communication Commands………………………………………………………….52

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10.2.3 Time Zone Offset Commands………………………………………………………. 54
10.2.4 LCD Display Parameters Commands……………………………………………… 55
10.2.5 COM2 Serial Time Frame Command……………………………………………….56
10.2.6 Event Command……………………………………………………………………… 56
10.2.7 Additional Event’s Command……………………………………………………….. 56
10.2.8 Ethernet Default Command…………………………………………………………. 57
10.2.9 Password Change Command………………………………………………………..58
10.2.10 Miscellaneous Command…………………………………………………………….59
10.2.11 Antenna Cable Propagation Delay command…………………………………….. 60
10.2.12 Manual Time Setting command…………………………………………………….. 60
10.2.13 Example to illustrate unit commands………………………………………………..62
11. Timing Outputs – Serial, IRIG-B / IEEE 1344, NTP…………………………………………….. 65
11.1 Timing Output – Serial………………………………………………………………………. 65
11.1.1 NMEA-0183 RMC Time frame output……………………………………............. 65
11.1.2 T-Format Time frame output…………………………………………………………65
11.1.3 NGTS Time frame output…………………………………………………………….66
11.2 Timing Output – IRIG-B / IEEE 1344 C37.118-2005……………………………………… 67
11.2.1 Introduction…………………………………………………………………………….67
11.2.2 Time Code Output……………………………………………………......………….. 67
11.2.2.1 Standard IRIG-B Output…………………………………………………68
11.2.2.2 Abstract of IRIG-B Time Code………………………………………….68
11.2.2.3 IRIG-B AM & IRIG-B DCLS signals…………………………………… 68
11.2.2.4 IRIG-B IEEE 1344 Extension…………………………………………...69
11.2.2.5 Generated IRIG-B Time Codes………………………………………...70
11.2.2.6 Selection/configuration of IRIG-B Time Codes………………………. 70
11.2.2.7 Connecting IRIG-B Time Code…………………………………………71
11.2.2.7.1 Connecting IRIG-B DCLS………………………………. 72
11.2.2.7.2 Connecting IRIG-B AM…………………………………..72
11.3 Timing Output – NTP…………………………………………………………………………. 72
11.3.1 NTP Introduction………………………………………………………………………72
11.3.2 GPS Master Clock NTP Output……………………………………………………...73
11.3.3 NTP Client Synchronization………………………………………………………….74
11.3.4 NTP Hierarchical Time Distribution………………………………………………….75
12. Relay and Pulse Outputs……………………………………………………………………………..78
12.1 Relay Contact Outputs………………………………………………………………………. 78
12.2 Pulse Outputs…………………………………………………………………………………. 79
12.2.1 1PPS Output………………………………………………………………………….. 79
12.2.2 Event Output (PPM/PPH)………………….…………………………………………79
12.2.3 Additional Event Outputs (Programmable Pulse Outputs)………………………..79
13. Ethernet Communications: Telnet, SNMP……………..………………………………………….80
13.1 Telnet ……………………………………………………………………………………………80
13.2 SNMP…………………………………………………………………………………………….81
13.2.1 SNMP Addressing…………………………………………………………………….81
13.2.2 Protocol Detail……………………………………………………………………....... 81
13.2.3 SNMP Operation………………………………………………………………………82
13.2.4 SNMP Traps…………………………………………………………………………. 87

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14. Holdover Mode………………………………………………………………..………………………..89
15. Options…………………………………………………………………………………………………..90
15.1 Optional Input Power Supply ………………………………………………………………….90
15.1.1 Option 1: AC/DC Power Input………………………………………………………..90
15.1.2 Option 2: DC Power Input…………………………………………………………… 90
15.2 Optional Module – 1PPS Output………………………………………………………………91
15.2.1 Specifications…………………………………………………………………………. 91
15.3 Optional Module – IRIG-B TTL………………………………………………………………..91
15.3.1 Specifications…………………………………………………………………………. 91
15.4 Optional Module – IRIG-B AM…………………………………………………………………91
15.4.1 Specifications…………………………………………………………………………. 91
15.5 Optional Module – NMEA Output………………………………………………………….. 92
15.5.1 Specifications…………………………………………………………………………. 92
15.6 Optional Module – NTP Output…………………………………………………………….. 94
15.6.1 Specifications…………………………………………………………………………. 94
15.7 Optional Module – PTP/IEEE-1588 Output……………………………………………….. 95
16. Appendix List………………………………………………………………………………………….. 96
17. Troubleshooting……………………………..………………………………………………………...97
18. Abbreviations………………………………………………………………………………………….. 102

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List of Figures
3.1 The Basis of GPS…………………………………………………….…………………………….10
4.1 GPS Master Clock Model MC-1-M Model…………………………………………………….. 12
4.2 GPS Master Clock Model MC-1-M Mechanical Dimensions…………………………………..17
5.1 GPS Master Clock Model MC-1-M Front Panel Description………………………….......... 18
5.2 GPS Master Clock Model MC-1-M Rear Panel Description…………………………..............19
5.3 Power supply terminal…………………………………………………………………………….. 20
5.4 Relay and Standard Event terminal………………………………………………………………20
5.5 Additional Events terminal…………………………………………………………………………20
5.6 GPS Ethernet NTP terminal……………………………………………………………………….20
5.7 1PPS BNC terminal……………………………………………………………………………….. 21
5.8 IRIG-TTL, AM BNC terminal………………………………………………………………………21
5.9 COM1 terminal……………………………………………………………………………………...21
5.10 COM2 terminal……………………………………………………………………………………...22
5.11 GPS Antenna terminal……………………………………………………………………………..22
6.1 Antenna Mounting ………………………………………………………………………………… 26
6.2 Antenna Mounting with Lightening Arrestor …………………………………………………….26
6.3 GPS Master Clock Model MC-1-M Wiring Diagram…………………………………………….31
7.1 GPS Master Clock Model MC-1-M Main board (Top View)……...…………………………. 33
9.1 Front Panel Keypad Layout……………………..………………………………………………..42
10.1 Path of HyperTerminal…………………………………………………………………………….45
10.2 Hyperterminal View………………………………………………………………………………..46
10.3 COM 2 terminal Cable Connections……………………….……………………………………..46
10.4 LCD Display - COM port Settings of GPS Master Clock………..…………………………….. 47
10.5 HyperTerminal Configuration…………………………………………………………………….. 47
10.6 Default NGTS Time frame on Hyper Terminal Screen…………………………………………47
10.7 Serial Message – Configuration Menu………………………………………………………….. 50
10.8 Serial Message - Help Menu……………………………………………………………………...51
10.9 Hyperterminal communication settings…………………………………………………………..53
11.1 IRIG-B waveforms………………………………………………………………………………….69
11.2 NTP frame format…………………………………………………………………………………..73
11.3 NTP Time distribution in Hierarchical Arrangement………………………..………………….. 75

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List of Tables
5.1 GPS Master Clock Model MC-1-M Front Panel Key Definitions……………………………19
6.1 Antenna Mounting…………………………………………………………………….………….30
7.1 Power Relay Configuration…………………………………………………………………….. 33
7.2 GPS LOST Relay Configuration………………………………………………………………..34
7.3 WATCHDOG Relay Configuration……………………………………………………………..34
7.4 COM1 terminal RS-232/RS-485 Configuration………………………………….................. 35
7.5 COM2 terminal RS-232/RS-485 Configuration………………………………….................. 35
9.1 Keypad Function………………………………………………………………………………… 42
10.1 SNMP Default Command Parameters…………………………………………………………58
10.2 Default Command Parameters………………………………………………………………… 59
11.1 NMEA-0183 Time string format………………………………………………....................... 65
11.2 T-format Time string format……………………………………………………………………..66
11.3 NGTS Time string format…………………………………………………………................... 67
11.4 Assignment of CF Segment for IEEE 1344(C37.117-2005)………………………………...69
12.1 Relay Contact Status Chart during Operation………………………………………………...78
13.1 Configurable Parameters through Telnet ……………………………………………………..80
15.1 Switch configuration for Optional NMEA Module……………………………………………. 92
15.2 BaudRate Switch settings for Optional NMEA Module………………………………………93
15.3 Parity Switch settings for Optional NMEA Module……………………………………………93
15.4 StopBit Switch settings for Optional NMEA Module………………………………………….93
15.5 Databits Switch settings for Optional NMEA Module………………………………………...93

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1. Unpacking GPS Master Clock model MC-1-M
1.1 Standard Items
GPS Master Clock device model MC-1-M model is shipped with below standard items.
•GPS Master Clock model MC-1-M unit
•Antenna Cable RG6/RG8 as per specified cable length in Customer Order / quote.
•GPS Antenna and Antenna Clamp integrated
•2 meters RG58 BNC Cable – Qty: 2
•2 meters RJ45 Ethernet Cable – Qty: 1
•2 meters RS-232 GPS Configuration Cable – Qty: 1
•Documents – User Manual and supporting Appendix manuals, Test Report, Test Certificates(On
Customer Request only)
•CD for Masibus NTP Utility Software – Qty: 1
NOTE: Antenna Cable type (RG6 / RG8) and antenna cable length (15 meters / 30 meters / 50 meters /
customized) is shipped only as per customer order. RG8 cable is provided if antenna cable length
requirement is more than 50 mts.
1.2 Optional Items
GPS Master Clock device model MC-1-M model can also be shipped with below optional items only as
per customer order.
•Unit Power Supply Cord
•Antenna Cable type and Antenna Cable length
•Lightening Arrestor
•In-Line Antenna Amplifier
•Antenna Splitter
•Antenna holding Mast (of specified length) and its holding clamps
•Antenna Cable GI Conduit

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2. Introduction
m
mm
masibus
asibusasibus
asibus GPS Master Clock model MC-1-M has been developed to address key power and process
industry timing requirements. Whether it’s the monitor, control or analysis of the power system, GPS
Master Clock Model MC-1-M is the cost-effective GPS time synchronization solution.
To begin with, GPS Master Clock model MC-1-M offers precise timing accuracy using GPS satellites; it
generates accurate output pulses and time codes in multiple formats. It’s necessary every time to Lock
GPS once after power ON in order to ensure the better accuracy.
GPS Master Clock Model MC-1-M synchronizes a wide variety of microprocessor-based power system
equipment including: SCADA systems, remote terminal units (RTUs), protection relays, sequence of
event recorders, digital fault recorders, tariff meters, Slave Display Units, Data Loggers and other
Intelligent Electronic Devices (IEDs). Being a Field programmable device using HyperTerminal, a very
common application in Windows or 8 key Keypad provided on the front panel, GPS Master Clock Model
MC-1-M allows the user to alter the settings or choose from Time codes. The serial port COM2
(RS232/RS485 Factory configurable) is provided for that purpose. Each output can feed directly to
different areas through electrically isolated ports which ensure reliable operation in a harsh substation
environment.
GPS Master Clock Model MC-1-M generates a wide range of timing signals via fifteen (Seven ports are
available in factory set configuration) output ports. Standard configurations of GPS Master Clock Model
MC-1-M is equipped with two serial ports, a 1PPS Port, 1 IRIG-B TTL / IEEE 1344 (field configurable) and
three PFC relay outputs for POWER, WATCHDOG, GPS LOST alarm and standard PMOS relay based
pulse output of PPM/PPH or RTC ON event. GPS Master Clock Model MC-1-M is available with optional
feature outputs such as NTP/SNTP, 4 additional PMOS relay based pulse outputs each configurable from
a second to a day period time, IRIG-B127 / IEEE 1344/C37.118-2005 Amplitude modulated output(field
configurable), PTP(Precision time protocol output). Com1 Serial port provides NMEA-0183(RMC) format,
2.048 frequency output. Com2 serial port is configurable for either NGTS or T-format. Another fixed
output provides a very accurate pulse per second with accuracy of (±500ns to UTC). Time
synchronization protocol (NTP) standard as Server mode is implemented in GPS Master Clock Model
MC-1-M to provide time synchronization to different network Clients which are supporting NTP protocols
(NTPv3, SNTP). Additional NTP, IRIG-B TTL / IEEE 1344, IRIG-B / IEE 1344 Modulated and Serial
(NMEA-0183 RMC) optional ports are also available with GPS Master Clock Model MC-1-M product.
GPS Master Clock Model MC-1-M units feature a front panel display, giving both installation teams and
users visual feedback about the time data being generated on the outputs. LED indicators provide “at a
glance” status information.
The optimized Receiver/Antenna system employed in GPS Master Clock Model MC-1-M provides time
information from the GPS satellite constellation. Dynamic T-RAIM processing is used to eliminate any
aberrant satellite signals from the timing solution. The result is timing precision on all outputs with
accuracy similar to that normally seen only in laboratory instruments.
GPS Master Clock Model MC-1-M unit is Rack Mount and its mechanical dimensions are 482.6(W) x
88(H) x 305(D) mm (IP 20 Enclosure).It is supplied complete with all hardware and software required for
the installation, including the Antenna, Antenna mounting kit, 10 meters Antenna cable, 3 meters RS-232
cable and 10 meters RG58 Co-axial cable. (Depends upon commercial terms & condition)

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3. GPS Fundamentals
GPS Master Clock Model MC-1-M device is a GPS/GNSS based receiver clock device which provides
accurate time output with 1PPS signal. Satellite Navigation system is a system of satellites that provide
autonomous geo-spatial positioning with global coverage. It allows small electronic receivers to determine
their location (longitude, latitude, and altitude) to high precision (within a few meters) using time
signals transmitted along a line of sight by radio from satellites. GNSS is a satellite navigation system that
is used multiple navigation systems mainly GPS and GLONASS. GNSS also include satellite navigation
systems of SBAS, QZSS, Galileo systems etc.
GPS satellite navigation system is maintained by United States of America since 1994 which consists of
at-least 24 operational satellites out of 32 satellites in six orbital planes orbiting at an altitude of
approximately 20,200 km. In typical GPS operation, four or more satellites must be visible to obtain an
accurate result. Satellite-based navigation systems use a version of triangulation to locate the user,
through calculations involving information from a number of satellites.
Figure 3.1: The Basis of GPS
If one considers Figure 1 which shows a flat plane. X and Y are two known fixed points on the plane. P is
an unknown point. If the distances PX and PY can be measured, then the position of point P can be
calculated. Actually there is an ambiguity in that point P’ would also fit the measurements. This can be
resolved if the position of a third fixed point Z is known since PZ is different to P’Z. This can be summed
up by saying that the unknown point P lies at the intersection of three circles based on the known points
X, Y and Z.
When the plane becomes three dimensional spaces, the circles become spheres. The intersection of two
sphere is a circle, and the intersection of three spheres is a pair of points analogous to the points P and
P’ of the flat plane case. As for the flat plane case a measurement from an extra fixed point is required to
absolutely resolve the ambiguity, although in many cases the ambiguous point would be below the
surface of the world. Thus to achieve the objective, GPS must provide accurate measurement of distance
from the unknown location of the receiver to 4 known points.

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GLONASS based satellite navigation system is maintained by Russia, a fully functional navigation
constellation in 1995. After the collapse of the Soviet Union, it fell into disrepair, leading to gaps in
coverage and only partial availability. It was recovered and fully restored in 2011. It provides an
alternative to Global Positioning System (GPS) and is the second alternative navigational system in
operation with global coverage and of comparable precision.
A fully operational GLONASS constellation consists of 24 satellites, with 21 used for transmitting signals
and three for in-orbit spares, deployed in three orbital planes. The three orbital planes' ascending nodes
are separated by 120° with each plane containing eight equally spaced satellites. The orbits are roughly
circular, with an inclination of about 64.8°, and orbit the Earth at an altitude of 19,100 km, which yields an
orbital period of approximately 11 hours, 15 minutes. The overall arrangement is such that, if the
constellation is fully populated, a minimum of 5 satellites are in view from any given point at any given
time. This guarantees for continuous and global navigation for users world-wide.
A characteristic of the GLONASS constellation is that any given satellite only passes over the exact same
spot on the Earth every eighth sidereal day (1 sidereal day = 23 hours, 56 minutes, 4.0916 seconds).
However, as each orbit plane contains eight satellites, a satellite will pass the same place every sidereal
day. For comparison, each GPS satellite passes over the same spot once every sidereal day. So
opposed to the GPS the ground-track of the GLONASS satellites do not repeat after one day. This avoids
the resonance effects which makes station keeping of GPS satellites difficult and expensive.
In GPS navigation system, all satellites operates at same frequency at 1.57542 GHz (as L1 signal) and
1.2276 GHz (as L2 signal) using CDMA technique whereas GLONASS navigation system, all satellites
operate on different frequencies using originally a 25-channel frequency FDMA technique spanning from
1602.5625 MHz to 1615.5 MHz, known as the L1 band.
As GNSS uses navigation satellite system of GPS, GLONASS and other available systems in space,
GNSS receivers can easily observer 10 to 12 satellites at a time. As more number of satellites are visible,
more accuracy in receivers output signals are achieved.
Each visible satellite broadcast two types of information in its message format i.e. Almanac and
Ephemeris. Almanac data is course orbital parameters for all visible satellites. Each visible satellite
broadcasts Almanac data for all visible satellites. This Almanac data is not very precise and is considered
valid for up to several months. Ephemeris data by comparison is very precise orbital and clock correction
for each visible satellite and is necessary for precise positioning. Each visible satellite broadcasts only its
own Ephemeris data.The ephemeris is updated every 2 hours and is usually valid for 4 hours.

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4. GPS Specification
Figure 4.1: GPS Master Clock Model MC-1-M Model
RECEIVER
CHARACTERISTICS
Timing Accuracy
< 15 ns with GPS receiver (the receiver is locked on a fixed position).
<±0.1 ppm (OCXO) accuracy while GPS Is Unlock*
<±5.0 ppm (TCXO) accuracy while GPS Is Unlock*
Positioning Accuracy
<10mts SEP (with Selective Availability [SA] Disabled).
Receiver Input
1575.42 MHz L1 C/A Code.
Tracking
12 parallel channels.
Acquisition Time
Hot Start : <5 s
Warm Start: <38 s
Cold Start : < 45 s
Memory Backup
Internal 17 mAh cell, Sufficient for 2 weeks of backup time
Needs 72 hours run for full charging.
Antenna
Active L1 GPS, 30 dB Gain
Cable: RG 6 / RG 8 (Optional coaxial cable)
Maximum Length: 100 meters (Up-to 400 meters using additional line
amplifier)
Coverage: 360 Degree
Ingress Protection: IP67
* If GPS is supplied with OCXO/ TCXO and available on request.

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FIXED OUTPUTS
Pulse
1 PPS
Accuracy: ±500 ns Accuracy with GPS locked
Output: TTL into 250 Ω
Pulse Width: 200 (200 mS High & 800 mS Low signal)
Interface: BNC Female connector(Rear Panel)
Alarms
Three Isolated Dry Contacts to 230 VAC / 24VDC, 10 A:
1. GPS Lost
2. Watchdog
3. Power Fail
Interface: 8-Way Terminal Strip
Event/RTC ON
One Event per minute or per hour or RTC ON/OFF (Configurable)
Interface: 8-Way Terminal Strip (Rear Panel)
Event contact capacity: 350V DC, 120mA maximum
IRIGB-TTL - DC Level Shift / IEEE 1344/C37.118-2005
Format: IRIG-B(007) [IRIGB TTL] or IEEE 1344/C37.118-2005 (field
selectable)
Output: TTL into 50 Ω
Interface: BNC Female connector (Rear Panel)
Optional: up to 9.
Serial
COM1
Protocol: NMEA-0183 (RMC)
Port Settings: 9600-8-N-1
Output: RS232/RS485** (Factory Configurable)
Interface: DB9 Female Connectors (Rear Panel)
COM2
Protocol: NGTS/ T-Format
Port Settings: 4800/9600-7/8-N/E/O-1/2 (Configurable)
Output: RS232/RS485** (Factory Configurable)
Interface: DB9 Female Connectors (Rear Panel)
** RS232 is factory set

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OPTIONAL OUTPUTS
IRIGB-Modulated / IEEE 1344/C37.118-2005
Format: IRIG-B(127) or IEEE 1344/C37.118-2005 (field selectable)
Signal: 1 KHz AM Signal
Modulation Ratio: 3:1
Output: 3.3Vp-p to 10Vp-p, into 100Ω
Interface: BNC Female connector (Rear Panel)
Optional: up to 9.
Ethernet Output
Time Synchronization protocols: NTP/SNTP Server
[Factory settable]
NTP: Network Time Protocol (Version 3)
RFC: RFC- 1119, RFC- 1305
SNTP: Simple Network Time Protocol (Version 3)
Protocols: IPv4, SNMP v2, Telnet, TCP, UDP
RFC: RFC- 1361
Internet protocol: IPv4
Mode: Server
Time format: UTC
Network Interface: 10/100 Mbps
Interface: RJ-45 Connector (Rear Panel)
Optional: up to 4 outputs.
Serial Output
Protocol: NMEA-0183 (RMC)
Port Settings: 1200/2400/4800/9600/19200/-7/8-N/O/E-
1/2
(Configurable using DIP Switches)
Output: RS232/RS485** (Factory Configurable)
Interface: DB9 Female Connectors (Rear Panel)
Optional: up to 4.
Additional Event Outputs
Four independent configurable Event outputs
Configuration: Individual configurable time period and pulse ON time
through COM2
Time Period: 1 to 86400 seconds (24 Hr.) max
ON Time: min. 50 milliseconds and max 50% of period time set for
particular event
Event contact capacity: 350 VDC, 120mA maximum
Interface: 8-Way Terminal Strip (Rear Panel)
Frequency Output
ITU-T G.703 (E1)
Interface: BNC Female connector (Rear Panel) into 75 ohms
Unbalanced output

Model: MC-1-M (2U)
Doc. Ref. no. : - m05/om/101
Issue no. 14
Page 15 of 103 User’s Manual
INTERFACE
Display
4x20 LCD with Backlit, 85x19.8 mm with Backlight
Displayed data
Time of Day (HH:MM:SS)
Day of week
Day of Year
Date (DD/MM/YY)
Latitude, Longitude, Height
Number of satellites available
Data Format on COM2
Parameters of both serial ports
GPS status information
Keypad
Status LED
Power : Red
1 PPS : Red
Event : Red
Watchdog : Red
GPS Locked : Green
Programming
Using HyperTerminal in a local PC via COM2 or using Front Keypad
Programmable parameters:
Global Time zone correction
12/24 Hrs Format of Time
COM2 serial port setting
COM2 data format selection (NGTS or T-FORMAT)
KEY FUNCTION
MENU For Entering into Configuration mode.
HELP To Display help about every parameter
configurations.
OK To save the final Configurations.
ESC To come back into Run mode.
UP Scroll between various parameters in ascending
order.
DOWN Scroll between various parameters in descending
order.
LEFT To select various available options for the particular
parameter.
RIGHT To select various available options for the particular
parameter.

Model: MC-1-M (2U)
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Issue no. 14
User’s Manual Page 16 of 103
Duration of Programmable repetitive event generation output via dry
contact (Per Minute or Hour).
Password Protection
Network Settings:
IP address, Subnet mask, Gateway and SNMP Manager IP addresses
configurable through Telnet remote login.
All network configurations are password protected.
POWER SUPPLY
AC: 90 to 264 V, 47-63 Hz
DC: 125-300 V
Power Consumption: <15W Typical (40W Max)
OPTIONAL
POWER SUPPLY
DC: 18 – 72 V
Power Consumption: 40W Max
PHYSICAL
DIMENSIONS
19” Rack Mountable
Width: 482.6 mm (19”)
Depth: 305 mm (12.0079”)
Height: 2 U – 88 mm (3.46”)
Weight: 4 Kg (approx.)
ENVIRONMENT
Temperature
Operating: 0° C to +55° C
Storage: -20° C to +80° C
Humidity
20 - 90% (Non-condensing)
EXTRA MODULES
(OPTIONAL)
RS232-to-RS485 Converter
LINE AMPLIFIER, SURGE ARRESTOR
Time Distribution Rack (TDR-4)
Time Signal Repeater (TSR-4)
Time Display Unit (TDU-64)
Netser (NGTS to NTP Convertor)
TYPE TEST
Radiated Emission on mains port (RE) – CISPR 22
Electro Static Discharge – IEC 61000-4-2
Radiated Susceptibility – IEC 61000-4-3
Electrical Fast Transient – IEC 61000-4-4
Surge - IEC 61000-4-5
Conducted Susceptibility - IEC 61000-4-6
Power Frequency Magnetic Field – IEC 61000-4-8
High Frequency Disturbance – IEC 61000-4-10
Voltage Dips & Interruption Test – IEC 61000-4-11
Damped Oscillatory Magnetic Field – IEC 61000-4-12
Vibration – IEC 68-2-6
Cold Test – IEC 60068-2-1:2007
Shock Test – IEC 60255-21-2
Dry Heat – IEC 60068-2-2
Damp Heat Steady State Test - IEC 60068-2-30
Di-electric Test, Vibration Test etc.
I
solation
(Withstanding
Between primary terminals* and secondary terminals**:
At least 1500 V AC for 1 minute

Model: MC-1-M (2U)
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voltage)
Between primary terminals* and grounding terminal:
At least 1500 V AC for 1 minute
Between grounding terminal and secondary terminals**:
At least 1500 V AC for 1 minute
Between secondary terminals**:
At least 500 V AC for 1 minute
* Primary terminals indicate power terminals and relay output terminals.
** Secondary terminals indicate Output Ports.
Insulation resistance: 20Mor more at 500 V DC between power terminals
and grounding terminal.
Note: No Isolation between IRIGB-TTL and PPS Output
4.1 Mechanical Dimensions Layout
Figure 4.2: GPS Master Clock Model MC-1-M Mechanical Dimensions

Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
Issue no. 14
User’s Manual Page 18 of 103
5. Unit Front and Rear Panel Description
This section provide description of GPS Master Clock Model MC-1-M unit front panel and back panel user
applicable interface.
5.1 GPS Master Clock model MC-1-M Front Panel
Below image shows GPS Master Clock Model MC-1-M model front panel. The front panel is equipped
with 20 x 4 line LCD display, 4 LED status indicators, Power LED indicator and keypad interface.
Figure 5.1: GPS Master Clock Model MC-1-M Front Panel Description
1. LCD Display: GPS Master Clock Model MC-1-M model is equipped with 20 character x 4 line
display. This displays various parameters such as Clock parameters (time, date, day of year, day
of week), GPS LOCK/UNLOCK status, GPS satellites data (latitude, longitude, antenna height,
total number of satellites available), Keypad configurable parameters etc
2. LED status Indicators: There are total 5 LED indicators including power led indication and four
other status indicators.
POWER: This LED illumination is RED color. This LED indicates the presence of power to
unit.
1PPS: This LED indicates the presence of 1PPS signal from GPS receiver module. It blinks
at every one second. The illumination is of RED color.
RTC ON / EVENT: This LED illumination is RED color. This LED indication functionality
depends on the type of feature available with ordered GPS Master Clock Model MC-1-M
device.
1. If the customer has ordered unit with EVENT output, this LED illuminates as per the
configured Standard Event period. If the configuration of EVENT output is PPM (Pulse
per Minute), this LED blinks at every 1 minute with respect to time on LCD display and
will remain ON for 1 second. If the configuration of EVENT output is PPH (Pulse per
Hour), this LED blinks at every 1 hour with respect to time on LCD display and will remain
ON for 1 second. Configuration can be done through front panel keypad or through
COM2 terminal on rear panel.
2. If the customer has ordered unit with RTC ON feature, this LED will blink when there is
no GPS signal present (in UNLOCK condition) and unit is running on its internal clock.
WATCHDOG: This LED illumination is RED color. This LED is ON when the unit becomes
unhealthy due to GPS receiver module failure or internal failure.

Model: MC-1-M (2U)
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GPSLOCKED: This LED illuminates GREEN color if the GPS satellites signal are available
and GPS is LOCKED and remain in OFF condition if no GPS satellites are available.
3. KEYPAD: GPS Master Clock Model MC-1-M device is equipped with keypad buttons to configure
various parameters of Unit. Functionality/usage of each key is described below:
Table 5.1: GPS Master Clock Model MC-1-M Front Panel Key Definitions
5.2 GPS Master Clock model MC-1-M Rear Panel
Below figure 5.2 shows GPS Master Clock Model MC-1-M model rear panel.
Figure 5.2: GPS Master Clock Model MC-1-M Rear Panel Description
Various outputs of GPS Master Clock Model MC-1-M device is provided at rear panel of unit. Below is the
description of all possible outputs as per GPS Master Clock Model MC-1-M configurations with 1 NTP, 1
IRIG-B AM output and 4 additional pulse outputs. There may be other optional outputs present (as per
ordered configuration) apart from standard outputs.
KEY FUNCTION
MENU
MENU To enter in Configuration mode.
HELP
HELP To Display help about every parameter configurations.
OK
OK To save the final configurations changes done.
ESC
ESC To come back into Run mode.
UP Scroll between various parameters in ascending order.
DOWN Scroll between various parameters in descending order.
LEFT To select various available options for the particular
parameter.
RIGHT To select various available options for the particular
parameter.

Model: MC-1-M (2U)
Doc. Ref. no. : m05/om/101
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User’s Manual Page 20 of 103
1. Power Input and Fuse Connector:
Figure 5.3: Power supply terminal
2. Relay and Event contacts:
GPS Master Clock Model MC-1-M provide three relay outputs for Power, Watchdog and GPS
LOST alarm and OptoMOS pulse output through 8 pin female connector. Factory set Relay
contact provided on rear panel connector are C-NO terminals.
Figure 5.4: Relay and Standard Event terminal
Please refer Relay output section 12.1 for various configurations.
3. Additional Event outputs (Optional):
GPS Master Clock Model MC-1-M has the capability to provide multiple event outputs in addition
to standard PPM/PPH event output. The single event output provides pulse at configured event
interval with pre-configured pulse width. This pulse outputs are OptoMOS output (optically
coupled solid state Relay output) provided through 8 pinfemale connector.
Figure 5.5: Additional Events terminal
4. Ethernet Output Connector:
GPS Master Clock Model MC-1-M is equipped with 10/100 Mbps Ethernet output for NTP, SNMP
and Telnet communication as shown in figure 5.6.
Figure 5.6: GPS Ethernet NTP terminal
GPS Master Clock Model MC-1-M model is available with additional 1 - 4 NTP outputs as
optional. Please refer optional outputs section 15 for more information.