Orolia Spectracom EC20S User manual

EPSILON CLOCK
MODEL EC20S
User’s Manual
spectracom.com
Ref. Number 170142
Revision : Rev7
26th of February 2018

SPECTRACOM LIMITED WARRANTY
© 2009-2018 Spectracom. All rights reserved.
The information in this document has been carefully reviewed and is
believed to be accurate and up-to-date. Spectracom assumes no
responsibility for any errors or omissions that may be contained in this
document, and makes no commitment to keep current the information in this
manual, or to notify any person or organization of updates. This User
Reference Guide is subject to change without notice. For the most current
version of this documentation, please see our web site at:
spectracom.com
Spectracom reserves the right to make changes to the product described in
this document at any time and without notice. Any software that may be
provided with the product described in this document is furnished under a
license agreement or nondisclosure agreement. The software may be used
or copied only in accordance with the terms of those agreements.
No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or any means electronic or mechanical, including
photocopying and recording for any purpose other than the purchaser's
personal use without the written permission of Spectracom.
Other products and companies referred to herein are trademarks or
registered trademarks of their respective companies or mark holders.
Warranty Information
For a copy of Spectracom's Limited Warranty policy, see the Spectracom
website: http://spectracom.com/support/warranty-information

EPSILON CLOCK MODEL EC20S Spectracom
iii User’s Manual
TABLE OF CONTENTS
1. TERMINOLOGY ................................................................................................................................ 8
2. OVERVIEW........................................................................................................................................ 9
2.1 Main Features 9
2.2 Dimensions and Weight 10
2.3 Operating Environment 11
3. SAFETY PRECAUTIONS ................................................................................................................... 12
3.1 Power Supply 12
3.2 Safety during Adjustments, Maintenance and Repair 14
4. DELIVERY INSPECTION................................................................................................................... 15
4.1 Inventory 15
4.2 Inspection 15
5. FRONT AND REAR PANELS DESCRIPTION..................................................................................... 16
5.1 Front Panel Description 16
5.2 Back Panel Description 17
6. PUTTING THE EC20S INTO OPERATION ......................................................................................... 18
6.1 Preliminary Connections 18
6.2 Powering Up 18
6.3 Network Connection 19
6.4 Configuring the EC20S 19
6.5 Start-up sequence 20
7. POWER SUPPLY INTERFACE ........................................................................................................... 21
7.1 AC Power Supply Input 21
7.2 DC Power Supply Input 21
7.3 Redundancy System of the power supply 21
7.4 Power Supplies Monitoring 21
8. NETWORK INTERFACE .................................................................................................................... 22

Spectracom EPSILON CLOCK MODEL EC20S
iv User’s Manual
8.1 Ethernet Port 22
8.2 Network Services 23
8.2.1 DHCP Client .................................................................................................................................................23
8.2.2 HTTP SERVER.............................................................................................................................................23
8.2.3 SNMP SERVER............................................................................................................................................23
8.2.4 NTP SERVER...............................................................................................................................................23
8.2.5 TELNET SERVICE......................................................................................................................................24
8.2.6 FTP SERVICE ..............................................................................................................................................24
8.2.7 ICMP SERVICE ...........................................................................................................................................24
8.2.8 Monitoring the EC20S by means of nETWORK SERVICES ......................................................................24
9. SYNCHRONIZATION SOURCES ..................................................................................................... 25
9.1 Multi-GNSS Synchronization Source 25
9.2 External 1PPS Synchronization Source 26
9.3 External NMEA Datation Source 28
9.4 Synchronization Sources Monitoring 28
10. OPERATIONAL TASKS .................................................................................................................... 28
10.1 Selection of the Synchronization Source 28
10.2 Disciplining Algorithm –SFN Conditions 29
10.3 Synchronization Signals Distribution 31
10.3.1 Start-up sequence detail.................................................................................................................................32
10.3.2 Short loss of the GNSS source sequence detail.............................................................................................33
10.3.3 Source change sequence detail ......................................................................................................................34
10.3.4 Holdover sequence detail ..............................................................................................................................35
11. SIGNALLING INTERFACES ............................................................................................................. 36
11.1 Visual Signalling 36
11.2 Alarms Signaling 37
11.2.1 Urgent Alarms...............................................................................................................................................38
11.2.2 Non-Urgent Alarms.......................................................................................................................................38

EPSILON CLOCK MODEL EC20S Spectracom
v User’s Manual
12. DISTRIBUTION INTERFACE.............................................................................................................. 38
12.1 1PPS Outputs 39
12.2 10MHz Outputs 39
12.3 NMEA Output 39
13. WEB INTERFACE ............................................................................................................................. 41
13.1 Welcome Page 41
13.2 Upper task bar and page header 42
13.3 Clock Status page 44
13.3.1 Global Status .................................................................................................................................................45
13.3.2 Alarms...........................................................................................................................................................47
13.3.3 Output status..................................................................................................................................................51
13.3.4 GNSS Status..................................................................................................................................................52
13.4 Administrator Password page 55
13.5 Network Setup page 56
13.6 SNMP & Traps Setup page 58
13.7 Time & Synchronization Source Setup page 63
13.7.1 User-defined datation ....................................................................................................................................64
13.7.2 Datation Setup...............................................................................................................................................64
13.7.3 Synchronization Setup...................................................................................................................................66
13.7.4 Distribution Setup .........................................................................................................................................69
13.7.5 Distribution Status for “On Time” Mute Mode .............................................................................................70
13.8 GNSS Setup page 72
13.9 Power Setup page 75
13.10 Events Logging 76
13.10.1 Event Origin..................................................................................................................................................77
13.10.2 Event Gravity ................................................................................................................................................77
13.10.3 Events log filtering........................................................................................................................................77
13.10.4 Clear events log.............................................................................................................................................78

Spectracom EPSILON CLOCK MODEL EC20S
vi User’s Manual
13.10.5 Download events log.....................................................................................................................................78
13.11 Software Version 78
13.12 Software Upgrade 80
13.13 Admin Page 82
13.13.1 SYSTEM RESET..........................................................................................................................................83
13.13.2 PASSWORD CHANGE................................................................................................................................83
13.13.3 CONFIGURATION EXTRACTION............................................................................................................83
13.14 Reboot 84
14. SNMP INTERFACE........................................................................................................................... 86
14.1 MIB Description 86
14.1.1 SNMP STATUS PARAMETERS.................................................................................................................86
14.1.2 SNMP CONFIGURATION PARAMETERS...............................................................................................89
14.1.3 SNMP TRAPS...............................................................................................................................................92
15. COMMAND LINE INTERFACE (CLI)............................................................................................... 94
15.1 Network settings 94
15.2 SNMP settings 96
15.3 EC20S restart 96
16. LEAP SECOND APPLICATION........................................................................................................ 96
17. TECHNICAL FEATURES ................................................................................................................... 97
17.1 Phase Lock-in at Power-up 97
17.1.1 Warming-up ..................................................................................................................................................97
17.1.2 Lock-in Time with GNSS signal...................................................................................................................97
17.1.3 Phase Noise ...................................................................................................................................................97
17.1.4 Holdover Mode .............................................................................................................................................98
17.1.5 Short Term Stability (Allan Variance) ..........................................................................................................98
17.2 Temperature Stability 99
17.3 Electromagnetic Compatibility & ROHS COMPLIANCE 99
17.4 Safety 99

EPSILON CLOCK MODEL EC20S Spectracom
vii User’s Manual
18. MAINTENANCE ............................................................................................................................ 100
18.1 Periodic Verification and Calibration 100
18.2 Updating the Software Version 100
18.3 Spare Parts 100
18.4 Troubleshooting 100
18.5 Customer Support Information 101
19. APPENDIX.....................................................................................................................................102
19.1 NMEA Connector 102
19.1.1 Pin-Out........................................................................................................................................................102
19.1.2 NMEA Message Input.................................................................................................................................104
19.1.3 NMEA Message Output..............................................................................................................................105
19.2 ALARM & RS232 SERIAL PORT Connector 106
19.3 DC Connector 108

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 8
1. TERMINOLOGY
1PPS One Pulse Per Second
1PPS driver Pulse signal obtained through division of the frequency driver
DHCP Dynamic Host Configuration Protocol
Frequency driver Frequency signal generated by the built-in oscillator
FTP File Transfer Protocol
GALILEO European positioning system
GLONASS GLObalnaya NAvigatsionnaya Sputnikovaya Sistema (RUS)
GNSS Global Navigation Satellite System
GPS Global Positioning System (US)
HTTP HyperText Transfer Protocol
ICMP Internet Control Message Protocol
IERS International Earth Rotation Service
IRIG Inter Range Instrumentation Group
MAC Medium Access Control
MIB Management Information Base
NMEA National Marine Electronics Association
NTP Network Time Protocol
OCXO Oven Controlled XTAL (Crystal) Oscillator
OID Object IDentifier
Rb Rubidium oscillator
S/A Selective Availability
SFN Single Frequency Network
SNMP Simple Network Management Protocol
TELNET TELetype Network
TRAIM Time Receiver Autonomous Integrity Monitoring
UTC Universal Time Coordinated

Spectracom EPSILON CLOCK MODEL EC20S
9 User’s Manual
2. OVERVIEW
2.1 MAIN FEATURES
The EPSILON CLOCK MODEL EC20S is a multi-GNSS Clock, providing the best cost-effective solution for
reliable, and 24-hour-a-day, uninterrupted applications. The EC20S is particularly well-suited for
broadcast operators requiring high quality, reliability and availability.
The EC20S is well dedicated to digital broadcast applications using SFN (Single Frequency Network)
mode. The EC20S gives the high reliability required at any step of the network, from SFN adapters to
high and medium power transmitters and gap fillers.
The EPSILON CLOCK MODEL EC20S provides accurate time and frequency synchronization.
Key parameters are:
•High performance OCXO or Rubidium oscillator disciplined by a GNSS synchronization source
through Epsiltime© smart predictive disciplining algorithm
•High performance holdover stability (2.10-10/day –OCXO STD version & 5 x 10-11/month-RUBIDIUM
version)
•AC and DC power supply redundancy
•Up to 10 x 1 PPS outputs

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 10
•Up to 10 x 10 MHz outputs
•1 PPS and 10 MHz signals are phased locked, which helps prevent phase jump and wander between
time and frequency signals
•Remote monitoring via the Ethernet port thanks to built-in supervision interfaces (13 Web Interface,
14 SNMP Interface) - Stratum 1 time stamp over Ethernet 10/100 Base-T (RJ45 port).
•Local monitoring via signalling interfaces (11.1 Visual Signalling, 11.2, ALARMS Signalling).
2.2 DIMENSIONS AND WEIGHT
Width : 19" (441 mm), without bracket
Height : 1 U (44 mm).
Depth : 340 mm.
Weight : <4.7 kg.
Compatibility : 19” rack
The EC20S unit is compatible with 19” racks and can be mounted with slides. Screws to fix the slides on
the equipment sides are provides with the equipment. Use Slides Accuride, part number: DZ 2907-0020
Hub 559mm.

Spectracom EPSILON CLOCK MODEL EC20S
11 User’s Manual
2.3 OPERATING ENVIRONMENT
- Operating temperature
With OCXO : -5 to 60°C
With Rubidium Oscillator : -5 to 50°C
- Storage temperature : -40 to 85°C
- Relative humidity : 95 % non-condensing
- Altitude : up to 2500m
- Pollution degree : 2

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 12
3. SAFETY PRECAUTIONS
3.1 POWER SUPPLY
•Before switching on the unit, ensure that it is compatible with the local mains supply. (Refer to
Setting the EC20S Into Operation).
•The plug must be inserted into a socket with earth connection. The safety connection must not
be broken by using an extension cord without earth conductor.
•Before switching on the unit, if the unit is connected to measurement or control circuits,
protective earth terminal(s) shall be connected to a protective conductor.
•If measurement or control circuits are without earth-ground protection terminal(s), the mains
plug shall be inserted before connections are made to measurement or control circuits.
WARNING If the protective conductor's path to ground is broken
or defeated, the danger of electrical shock to the
operator may be present. Never break the connection
on purpose.
Before disconnecting the unit from the main power
supply, always switch it off. Failure to do may cause
damage that voids your Spectracom warranty.
WARNING This equipment must be earth grounded. Never
defeat the ground connector or operate the
equipment in the absence of a suitably installed earth
ground connection. Contact the appropriate electrical
inspection authority or an electrician if you are
uncertain that suitable grounding is available.
The AC and DC power connectors of this equipment
have a connection to the earthed conductor of the AC
and DC supply earthing conductor through the AC and

Spectracom EPSILON CLOCK MODEL EC20S
13 User’s Manual
DC power cords. The AC source outlet must contain a
protective earthing connection.
This equipment shall be connected directly to the AC
power outlet earthing pin or DC supply system
earthing electrode conductor.
This equipment shall be located in the same
immediate area (such as, adjacent cabinets) as any
other equipment that has a connection to the
earthing conductor of the same AC or DC supply
circuit earthing conductor, and also the point of
earthing of the AC or DC system. The AC or DC system
shall not be earthed elsewhere.
The DC supply source is to be located within the same
premises as this equipment.
Switches or other disconnection devices shall not be
in the earthed circuit conductor between the AC and
DC source and the point of the connection of the
earthing electrode conductor to the unit’s AC and DC
input power connectors earthing pin.

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 14
3.2 SAFETY DURING ADJUSTMENTS, MAINTENANCE AND REPAIR
When the unit is connected to the power supply, it may be dangerous to touch the terminals and parts
that may be exposed when opening covers or removing components (except for plug-in components).
WARNING The interior of this equipment does not have any user
serviceable parts. Contact Spectracom Technical
Support if this equipment needs to be serviced.
This unit will contain more than one power source if
both the AC and DC power options are present.
Turning off the rear panel power switch will not
remove all power sources.
Remove all power sources by removing both the AC
and DC power cords connected to the equipment.
DC power Cord connector must be unlock before
removing.
This equipment has Double Pole/Neutral Line Fusing
on AC power.
When it is unavoidable to open the unit for maintenance and repair, such operations should be carried
out only by qualified personnel who are properly informed of the hazards involved.
Only fuses with a suitable rating and of the specified type are to be used for replacement purposes. It is
prohibited to use fuses that have been tampered with, or shorted fuse-holders.
WHENEVER IT IS LIKELY THAT PROTECTION HAS BEEN IMPAIRED, THE APPARATUS MUST BE SWITCHED
OFF, DISCONNECTED, AND SECURED AGAINST ANY UNINTENDED OPERATION.

Spectracom EPSILON CLOCK MODEL EC20S
15 User’s Manual
4. DELIVERY INSPECTION
4.1 INVENTORY
Before installing your Spectracom product, please verify that all material ordered has been received. If
there is a discrepancy, please contact Spectracom Customer Service. Customer service is available by
telephone at +33 (0) 1.64.53.39.80 (France), or +1.585.321.5800 (United States). Updated contacts
information are available on our web site (www.spectracom.com, and refer to the “Support” page.
CAUTION Electronic equipment is sensitive to Electrostatic
Discharge (ESD). Observe all applicable ESD
precautions and safeguards when handling the
Spectracom equipment.
NOTA:If the EC20S equipment is returned back to Spectracom, it must be
shipped in its original packing material. Save all packaging material for
this purpose.
The basic shipment includes the following items:
•EPSILON EC20S Base Unit
•One AC lead
•One DC connector kit
•User’s Manual
4.2 INSPECTION
Unpack the equipment and inspect it for damage. If any equipment has been damaged in transit, please
contact Spectracom Customer Service. Customer service is available by telephone at +33 (0)
1.64.53.39.80 (France), or +1.585.321.5800 (United States). Updated contacts information are available
on our web site (www.spectracom.com, and refer to the “Support” page.

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 16
5. FRONT AND REAR PANELS DESCRIPTION
5.1 FRONT PANEL DESCRIPTION
Item
Name
Description
‘PWR’ LED
POWER LED
Indicates the status of the AC and DC power supplies. For
details, see 11.1.
‘SRC’ LED
SOURCE LED
Indicates the current status of the enabled
synchronization source (GNSS, External 1PPS/ NMEA
synchronization source). For details, see 11.1.
‘DST’ LED
DISTRIBUTION LED
Indicates the current status of the distributed 1PPS and
10MHz signals. For details, see 11.1.
Micro-Switch
FACTORY RESET
BUTTON
Reset the network configuration to factory settings. For
details, see 8.1. Note that the network settings are also
reset to the factory settings (i.e. IP address is reset to the
static address 192.168.0.100).

Spectracom EPSILON CLOCK MODEL EC20S
17 User’s Manual
5.2 BACK PANEL DESCRIPTION
Connector
Type
Description
AC POWER
IEC 320 –C14
AC power entry with integrated fuse.
DC POWER
XLR circular
DC power supply input.
‘1PPS Jn’
50 Ω BNC
Distributed One Pulse Per Second outputs.
‘10MHz J2n’
50 Ω BNC
Distributed sinus frequency outputs.
‘EXT’ : External 1PPS
50 Ω BNC
External input for a 1PPS Synchronization source.
Ethernet 10/100 BaseT
50 Ω BNC
Network connectivity.
‘GPS Antenna’
50 Ω N
Antenna inputs for GNSS receiver and remote
active antenna 5VDC supply.
‘ALARMS’
SUBD-9
Dry contacts for alarms and RS232 input/output
for the Command Line Interface (CLI).
‘NMEA’
SUBD-9
RS232 input/output for NMEA Time Of Day
messages.
GROUND
ØM4 lug stud
Casing grounding.

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 18
6. PUTTING THE EC20S IN TO OPERATION
The EC20S can be installed in a rack or used as-is.
6.1 PRELIMINARY CONNECTIONS
Before starting the EPSILON CLOCK MODEL EC20S, perform the following steps:
•Leave free space of a few centimeters under the unit, in order to make easier natural air flow
from bottom to top of the EPSILON CLOCK MODEL EC20S.
•Connect a ground lead from the earth pin on the EC20S back panel to the frame of the rack. Use
a Terminal Ring tongue for ØM4 lug stud. Note that 2 nuts and 2 lock washer are already
included on the rack unit. Cable: protective earth conductor must have a minimum size of
0.75mm².
•Connect the network cable (refer to 8) into the Ethernet input (RJ45 input).
•Connect the multi-GNSS antenna into the ‘GPS antenna’ input to acquire the multi-GNSS
synchronization source (refer to 9.1 and refer to the document ”Outdoor GPS Antenna
Installation Considerations –REF TN07-101”that you can download from our web site).
•If necessary, connect a backup synchronization source using the ‘EXT’ and ‘NMEA’ inputs (refer
to 9.2 and 9.3).
6.2 POWERING UP
The EC20S can be powered by an AC supply, a DC supply, or both AC and DC supplies. For full
redundancy, connect DC power cables to the DC connector and AC power cable to the AC connector.
WARNING Before connecting the power supplies:
- Read carefully 3.1, 7.1 and 7.2,
- Check the polarity of the power signal before
connecting it (refer to the back panel labels for the
pin-out).
Connecting cables for signals and power supplies should be secured to locks provided for this purpose.

EPSILON CLOCK MODEL EC20S Spectracom
19 User’s Manual
WARNING Power-up is immediate when connecting DC
power with the cable, while AC power must be
switched on.
The connection to the power supplies (AC or DC) can be checked by the ‘PWR’ LED (see 11.1).
6.3 NETWORK CONNECTION
Refer to 8 for the factory network settings.
The EC20S is factory defaulted in static mode regarding the IP address allocation mode. The EC20S is set
with the default IP address 192.168.0.100.
To modify the default network settings, connect a control PC through a crossover Ethernet cable or a
hub. Set the control PC IP address to an address belonging to the same sub-network 192.168.0.0 (e.g.
192.168.0.101).
On the control PC, open a web browser page at http://192.168.0.100. Click on the homepage to enter
the EC20S web interface. Select the "System Setup">"Network Setup" web page. Enter the administrator
password (factory defaulted to: ‘pwd’). Input the IP address allocation mode (static or DHCP) and the
EC20S static address if necessary.
In case of failure to access the EC20S web homepage at http://192.168.0.100, reset the EC20S network
settings to factory default settings using the ‘Factory Reset’ button in front of the product (refer to 8 for
the detailed procedure).
For version 16.03 and higher, when the user changes the Network configuration, the new values become
effective immediately after saving the configuration. It doesn’t need to reboot the system.
6.4 CONFIGURING THE EC20S
The EC20S can be remotely configured through an Ethernet network using:
-a HTTP navigator to access the EC20S web pages to monitor and modify the EC20S internal
settings (refer to 13 to learn more about the usage of the EC20S web interface),
-a SNMP browser to access and modify the EC20S SNMP objects (refer to 14 to learn more about
the usage of the EC20S SNMP interface).

EPSILON CLOCK MODEL EC20S Spectracom
User’s Manual 20
For the basic EC20S configuration, a few recommendations:
-refer to 7.2 regarding the DC power supply,
-refer to 9.1 regarding the multi-GNSS synchronization source,
-refer to 9.2 and 9.3 regarding the External 1PPS/NMEA synchronization source.
6.5 START-UP SEQUENCE
For a standard configuration implementing the multi-GNSS synchronization source, after the system
initialization sequence, the GNSS receiver locks to the satellites constellations (event reported by the
‘SRC’ LED which switches from red to green), and once the internal oscillator warming up is complete,
the oscillator is disciplined to get the ‘Locked’conditions (see 10.2). The whole process may take about
15 minutes.