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E
PSILON
C
LOCK
M
ODEL
EC20S
USER’S MANUAL
1565 Jefferson Road, Suite 460
Rochester, NY 14623
USA
Phone: US +1.585.321.5800
Fax: US +1.585.321.5219
3 Avenue du Canada
Bâtiment Gamma
91974 Les Ulis, France
Phone: +33(0)1.64.53.39.80
Fax: +33(0)1.64.53.39.81 www.spectracomcorp.com
www.spectracom.fr
Ref. Number 170142
Revision : Rev6
11 th
of June 2015
Copyright © 2008 Spectracom Corporation. The contents of this publication may not be reproduced in any form without the written permission of Spectracom Corporation .
Specifications subject to change or improvement without notice.
Spectracom, EPSILON CLOCK, NetClock, Ageless, TimeGuard, TimeBurst, TimeTap, LineTap, MultiTap,
VersaTap, and Legally Traceable Time are Spectracom registered trademarks. All other products are identified by trademarks of their respective companies or organizations.
All rights reserved.
SPECTRACOM LIMITED WARRANTY
LIMITED WARRANTY
Spectracom warrants each new product manufactured and sold by it to be free from defects in software, material, workmanship, and construction, except for batteries, fuses, or other material normally consumed in operation that may be contained therein AND AS NOTED BELOW, for five years after shipment to the original purchaser (which period is referred to as the “warranty period”). This warranty shall not apply if the product is used contrary to the instructions in its manual or is otherwise subjected to misuse, abnormal operations, accident, lightning or transient surge, repairs or modifications not performed by Spectracom.
The GNSS receiver is warranted for one year from date of shipment and subject to the exceptions listed above. The power adapter, if supplied, is warranted for one year from date of shipment and subject to the exceptions listed above.
THE TIMEVIEW ANALOG CLOCKS ARE WARRANTED FOR
ONE YEAR FROM DATE OF SHIPMENT AND SUBJECT TO
THE EXCEPTIONS LISTED ABOVE.
THE TIMECODE READER/GENERATORS ARE
WARRANTED FOR ONE YEAR FROM DATE OF SHIPMENT
AND SUBJECT TO THE EXCEPTIONS LISTED ABOVE.
THE WIRELESS CLOCK SYSTEM TRANSMITTERS AND/OR
TRANSCEIVERS AND CLOCKS ARE WARRANTED FOR
TWO YEARS FROM DATE OF SHIPMENT AND SUBJECT
TO THE EXCEPTIONS LISTED ABOVE.
THE EPSILON CLOCKS, BOARDS, AND
SYNCHRONIZATION UNITS ARE WARRANTED FOR TWO
YEARS FROM DATE OF SHIPMENT AND SUBJECT TO THE
EXCEPTIONS LISTED ABOVE.
The Rubidium oscillator, if supplied, is warranted for two years from date of shipment and subject to the exceptions listed above.
All other items and pieces of equipment not specified above, including the antenna unit, antenna surge suppressor and antenna pre-amplifier are warranted for 5 years, subject to the exceptions listed above.
SPECTRACOM 95 Methodist Hill Drive Suite 500 Rochester, NY 14623
+1.585.321.5800 FAX: +1.585.321.5218 www.spectracomcorp.com [email protected]
WARRANTY CLAIMS
Spectracom’s obligation under this warranty is limited to infactory service and repair, at Spectracom’s option, of the product or the component thereof, which is found to be defective. If in Spectracom’s judgment the defective condition in a Spectracom product is for a cause listed above for which
Spectracom is not responsible, Spectracom will make the repairs or replacement of components and charge its then current price, which buyer agrees to pay.
Spectracom shall not have any warranty obligations if the procedure for warranty claims is not followed. Users must notify Spectracom of the claim with full information as to the claimed defect. Spectracom products shall not be returned unless a return authorization number is issued by Spectracom.
Spectracom products must be returned with the description of the claimed defect and identification of the individual to be contacted if additional information is needed. Spectracom products must be returned properly packed with transportation charges prepaid.
Shipping
expense: Expenses incurred for shipping
Spectracom products to and from Spectracom (including international customs fees) shall be paid for by the customer, with the following exception. For customers located within the
United States, any product repaired by Spectracom under a
“warranty repair” will be shipped back to the customer at
Spectracom’s expense unless special/faster delivery is requested by customer.
Spectracom highly recommends that prior to returning equipment for service work, our technical support department be contacted to provide trouble shooting assistance while the equipment is still installed. If equipment is returned without first contacting the support department and “no problems are found” during the repair work, an evaluation fee may be charged.
EXCEPT FOR THE LIMITED WARRANTY STATED ABOVE,
SPECTRACOM DISCLAIMS ALL WARRANTIES OF ANY
KIND WITH REGARD TO SPECTRACOM PRODUCTS OR
OTHER MATERIALS PROVIDED BY SPECTRACOM,
INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTY OR MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
Spectracom 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 any
Spectracom product, material, or software sold or provided by
Spectracom, 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 Spectracom product or software, whatsoever or howsoever caused. In no event shall Spectracom be liable for any direct, indirect, special or consequential damages whether the claims are grounded in contract, tort (including negligence), or strict liability.
EXTENDED WARRANTY COVERAGE
Extended warranties can be purchased for additional periods beyond the standard five-year warranty for those products covered under five-year warranty. Contact Spectracom no later than the last year of the standard five-year warranty for extended coverage.
www.spectracomcorp.com
/ www.spectracom.fr
EPSILON CLOCK MODEL EC20S
Table of Contents
Spectracom Corporation
Safety during Adjustments, Maintenance and Repair
Redundancy System of the power supply
iii
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC20S
Multi-GNSS Synchronization Source
External 1PPS Synchronization Source
Synchronization Sources Monitoring
Selection of the Synchronization Source 27
Disciplining Algorithm – SFN Conditions 28
Synchronization Signals Distribution 30
iv
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EPSILON CLOCK MODEL EC20S Spectracom Corporation
Upper task bar and page header
Administrator Password page 51
Time & Synchronization Source Setup page 58
v
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Spectracom Corporation EPSILON CLOCK MODEL EC20S
Electromagnetic Compatibility 90
vi
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EPSILON CLOCK MODEL EC20S
Spectracom Corporation
Periodic Verification and Calibration
Customer Support Information 91
ALARM & RS232 SERIAL PORT Connector
vii
User’s Manual
EPSILON CLOCK MODEL EC20S
1. TERMINOLOGY
1PPS
1PPS driver
DHCP
Frequency driver
FTP
GALILEO
GLONASS
GNSS
OCXO
OID
Rb
S/A
SFN
SNMP
TELNET
TRAIM
UTC
GPS
HTTP
ICMP
IERS
IRIG
MAC
MIB
NMEA
NTP
Spectracom Corporation
One Pulse Per Second
Pulse signal obtained through division of the frequency driver
Dynamic Host Configuration Protocol
Frequency signal generated by the built-in oscillator
File Transfer Protocol
European positioning system
GLObalnaya NAvigatsionnaya Sputnikovaya Sistema
Global Navigation Satellite System
Global Positioning System
HyperText Transfer Protocol
Internet Control Message Protocol
International Earth Rotation Service
Inter Range Instrumentation Group
Medium Access Control
Management Information Base
National Marine Electronics Association
Network Time Protocol
Oven Controlled XTAL (Crystal) Oscillator
Object IDentifier
Rubidium oscillator
Selective Availability
Single Frequency Network
Simple Network Management Protocol
TELetype Network
Time Receiver Autonomous Integrity Monitoring
Universal Time Coordinated
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Spectracom Corporation
2. OVERVIEW
EPSILON CLOCK MODEL EC20S
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)
AC and DC power supply redundancy
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EPSILON CLOCK MODEL EC20S
Up to 10 x 1 PPS outputs
Spectracom Corporation
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,
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
Depth
Weight
:
Compatibility :
:
:
1 U (44 mm).
340 mm.
<4.7 kg.
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.
2.3 OPERATING ENVIRONMENT
- Operating temperature
With OCXO
With Rubidium Oscillator
- Storage temperature
- Relative humidity
- Altitude
- Pollution degree
: -5 to 60°C
: -5 to 50°C
: -40 to 85°C
: 95 % non-condensing
: up to 2500m
: 2
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10
Spectracom Corporation
3. SAFETY PRECAUTIONS
EPSILON CLOCK MODEL EC20S
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
11
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
DC power cords. The AC source outlet must contain a protective earthing connection.
User’s Manual
EPSILON CLOCK MODEL EC20S Spectracom Corporation
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.
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Spectracom Corporation EPSILON CLOCK MODEL EC20S
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.
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EPSILON CLOCK MODEL EC20S
4. DELIVERY INSPECTION
Spectracom Corporation
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.spectracomcorp.com
, For France: www.spectracom.fr
) 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.spectracomcorp.com
, For France: www.spectracom.fr
) and refer to the “Support” page.
User’s Manual
14
Spectracom Corporation
5. FRONT AND REAR PANELS DESCRIPTION
5.1 FRONT PANEL DESCRIPTION
EPSILON CLOCK MODEL EC20S
Item
‘PWR’ LED
‘SRC’ LED
‘DST’ LED
Micro-Switch
Name
POWER LED
SOURCE LED
DISTRIBUTION LED
FACTORY RESET
BUTTON
Description
Indicates the status of the AC and DC power supplies. For
Indicates the current status of the enabled synchronization source (GNSS, External 1PPS/ NMEA
synchronization source). For details, see 11.1.
Indicates the current status of the distributed 1PPS and
10MHz signals. For details, see 11.1.
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).
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EPSILON CLOCK MODEL EC20S
5.2 BACK PANEL DESCRIPTION
Spectracom Corporation
Connector
AC POWER
DC POWER
‘1PPS J n
’
‘10MHz J
2n
’
‘EXT’ : External 1PPS
Ethernet 10/100 BaseT
50 Ω BNC
Type
IEC 320 – C14
XLR circular
50 Ω BNC
50 Ω BNC
50 Ω BNC
‘GPS Antenna’
50 Ω N
‘ALARMS’
‘NMEA’
SUBD-9
SUBD-9
GROUND
ØM4 lug stud
Description
AC power entry with integrated fuse.
DC power supply input.
Distributed One Pulse Per Second outputs.
Distributed sinus frequency outputs.
External input for a 1PPS Synchronization source.
Network connectivity.
Antenna inputs for GNSS receiver and remote active antenna 5VDC supply.
Dry contacts for alarms and RS232 input/output for the Command Line Interface (CLI).
RS232 input/output for Time Of Day messages.
Casing grounding.
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Spectracom Corporation
6. PUTTING THE EC20S IN TO OPERATION
The EC20S can be installed in a rack or used as-is.
EPSILON CLOCK MODEL EC20S
6.1 PRELIMINARY CONNECTI ONS
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 lockwasher 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
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.
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EPSILON CLOCK MODEL EC20S
WARNING
Spectracom Corporation
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
the detailed procedure).
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).
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.
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Spectracom Corporation
6.5 START-UP SEQUENCE
EPSILON CLOCK MODEL EC20S
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,
15 minutes.
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EPSILON CLOCK MODEL EC20S
7. POWER SUPPLY INTERFACE
Spectracom Corporation
7.1 AC POWER SUPPLY INPUT
The AC power supply shall be considered as the main power supply for the EC20S. It shall meet the following features:
- Use standard power cord type CEE7 VII / IEC320 C13.
- Nominal AC input voltage : 100 to 240 Volts AC / 50 to 60 Hz
- On switch detail)
: 2 fuses TT 1A L 250 V type - (example D1TD 1A 5x20 - see 16.3 for
7.2 DC POWER SUPPLY INPUT
The DC power supply shall be considered as a backup power supply for the EC20S. It shall meet the following features:
- For DC power cord, use conductor type : AWG24 (0.22mm
2
).
- Nominal DC input voltage conditions : 24 to 48 Volts DC
- Maximum Total Power consumption
- Protection against polarity reversal
: < 55 W
- -48V and 0V DC input wires are not ground referenced
- Protected by a PolySwitch fuse (automatically rearmed)
- Threshold level for the presence detection : 20 to 25 Volts DC
NOTA: When there is no DC power supply, it is strongly recommended to disable the alarms
associated with this power supply device (while the factory setting enables this alarm). See 13.9.
For detailed information about this supply interface, refer to the appendix 19.3.
7.3 REDUNDANCY SYSTEM OF THE POWER SUPPLY
When a DC power supply is present, the EC20S will automatically switch from the AC power supply to the DC power supply in case of failure of the AC power supply.
When the AC power supply is present, the DC power supply is internally disconnected.
7.4 POWER SUPPLIES MONITORING
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Spectracom Corporation
The presence of the power supplies (AC or DC) is monitored:
EPSILON CLOCK MODEL EC20S
-
-
by the ALARMS signalling (see 11.2.2),
-
via the web interface (see 13.3.2.6),
-
via the SNMP service (see 14.1.1, SNMP parameters 18 and 19).
8. NETWORK INTERFACE
8.1 ETHERNET PORT
- Connector type
- Interface
: RJ45
: 10/100 BaseT signal
- MAC address : Available on the sticker stuck on one of the side panels
- Port IP address assignment : Configurable by the user on the “Network Setup” web page (see 13.5):
Two modes can be selected: o Dynamic assignment (‘Use DHCP’ = ‘On’)
Possible if a DHCP server is accessible on the network o Static assignment (‘Use DHCP’ = ‘Off’)
This mode is also automatically selected by the EC20S if the EC20S is not connected to the network or if no DHCP server is accessible.
The port is factory defaulted in static mode (‘Use DHCP’ = ‘Off’ with the following parameters:
- Static IP address : 192.168.0.100
- Static IP mask : 255.255.255.0
- Static IP gateway : 192.168.0.254
The network configuration can be reset to factory settings (i.e. IP address is reset to the static address
192.168.0.100) at any time while pressing, for more than 2 seconds, the ‘Factory Reset’ button located on the front panel between the ‘PWR’ and ‘SRC’ LEDs. To press the button, insert a straightened paperclip into the hole.
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EPSILON CLOCK MODEL EC20S
8.2 NETWORK SERVICES
The EC20S incorporates the following network services:
Spectracom Corporation
8.2.1 DHCP CLIENT
The EC20S incorporates a DHCP client using the port numbers 67 and 68 to get (if so configured) from a remote DHCP server a dynamic IP address assigned to its Ethernet port.
8.2.2 HTTP SERVER
The EC20S can be monitored via a web interface using the HTTP protocol. The EC20S incorporates a
HTTP server accessible through the port number 80. For details about the web interface see 11.
8.2.3 SNMP SERVER
The EC20S can be monitored via a MIB browser using the SNMP protocol. The EC20S incorporates a
SNMP server accessible through the port numbers 161 (for the get/set methods) and 162 (for the trap
events). For details about the SNMP interface see 14.
8.2.4 NTP SERVER
The EC20S incorporates a basic NTP server accessible through the port number 123.
The EC20S can respond to NTP requests using the NTP protocol.
STRATUM
The stratum status is set according to the SFN status (which corresponds to the reliability / accuracy of
the time transferred via NTP ; cf. 10.2):
- Stratum = 15 : when SFN status is ‘Off’.
- Stratum = 1 : when SFN status is ‘On’.
LEAP SECOND INDICATOR
The leap indicator is set according to the SFN status (which corresponds to the reliability / accuracy of
the time transferred via NTP ; cf. 10.2) and the leap second information:
- leap indicator = 11 : when SFN status is ‘Off’.
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Spectracom Corporation
- leap indicator = 00
- leap indicator = 01
- leap indicator = 10
EPSILON CLOCK MODEL EC20S
: when SFN status is ‘On’ and no leap second shall be applied.
: when SFN status is ‘On’ and a positive leap second shall be applied.
: when SFN status is ‘On’ and a negative leap second shall be applied.
8.2.5 TELNET SERVICE
The EC20S can be remotely monitored by Spectracom, for trouble-shooting purposes, using the TELNET service incorporated in the EC20S product and accessible through the port number 23. This service is
only available for Spectracom software administrators.
8.2.6 FTP SERVICE
The EC20S can be upgraded using the web interface. The uploading of new EC20S software release are performed using the FTP service incorporated in the EC20S product and accessible through the port numbers 20 and 21.
8.2.7 ICMP SERVICE
The EC20S incorporates the ICMP service so that it can respond to ping requests.
8.2.8 MONITORING THE EC20S BY MEANS OF NETWORK SERVICES
CAUTION
Spectracom recommends to use, for monitoring purpose, recent OS and inform that running older OS (Windows XP or before, Windows Server 2008 or before) might result in network services failures.
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EPSILON CLOCK MODEL EC20S
9. SYNCHRONIZATION SOURCES
Spectracom Corporation
9.1 MULTI-GNSS SYNCHRONIZATION SOURCE
The EC20S incorporates a multi-GNSS receiver delivering a 1PPS which can be selected as a synchronization source (GNSS source). The GNSS source can be composed with one or two satellites
constellations by the user as follows (See 80, 81 and 82 for the details):
- GPS constellation only,
- GLONASS constellation only,
- Both GPS and GLONASS constellations.
The GLONASS satellites constellation is a feature subject to a license.
The GALILEO satellites constellation is only considered as a further development. It is not available in this EC20S release.
To acquire the multi-GNSS signals, a GNSS antenna shall be connected to the ‘GPS antenna’ connector located on the rear panel.
The GNSS antenna connector features are the following ones:
- Connector type : Antenna female 50
(type N)
- 2 x L1 GNSS C/A code
-
-
Power supply to active antenna
Fold Back protection
: 5V/80mA max
Power supply is cut in the event of a short-circuit in the antenna input
This synchronization source is defaulted to ‘Enabled’ with the highest priority ‘Priority 1’ by the factory settings.
Note: Disciplining parameters have been modified in order to provide more stable 1 pps and 10 MHz signals, when using combined GPS and Glonass satellites. (The best stability is still obtained, however, when using GPS only or Glonass only).
9.2 EXTERNAL 1PPS SYNCHRONIZATION SOURCE
An external 1PPS can be used as a primary or a backup synchronization source.
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Spectracom Corporation EPSILON CLOCK MODEL EC20S
The external 1PPS shall be input on the ‘EXT’ connector located on the rear panel according to the following features:
- TTL level
- Input impedance : 50Ω
- 50Ω BNC connector
- Active rise edge (high level duration 100µs minimum)
- Minimal Accuracy to UTC : ±50ns (1
)
CAUTION
If the External 1PPS synchronization source doesn’t have the required minimum features, the global performance of the
EPSILON CLOCK MODEL EC20S will decrease drastically.
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EPSILON CLOCK MODEL EC20S Spectracom Corporation
NOTA: When this synchronization source is not used, it is strongly recommended to disable it (this is
the factory setting). See 13.7.3 Priority Level: External 1PPS/NMEA.
CAUTION
When this synchronization source is used as a backup
synchronization source (in conjunction with an external NMEA
datation source 9.3 or not), take care that, at the moment the
EC20S switches from the main GNSS synchronization source to this synchronization source, the SFN conditions are lost until the new synchronization source is ‘Locked’. And so the
distribution of the synchronization signals (1PPS, 10 MHz) is
suspended during this time, when the ‘Automatic’ mute mode is selected. To maintain the distribution of the synchronization signals during the switch of synchronization sources, the mute mode shall be set in ‘Disabled’ mode. But in this case, the
synchronization signals will be, in any case, subject to a
phase jump. See 10.3 Synchronization Signals Distribution.
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Spectracom Corporation
9.3 EXTERNAL NMEA DATATION SOURCE
EPSILON CLOCK MODEL EC20S
An external NMEA datation source can be used in conjunction with the external 1PPS synchronization source to timestamp the 1PPS.
The external NMEA datation source shall be received on the ‘NMEA’ SUBD-9 connector on the rear panel:
- Connector type
- Port configuration
: 9-pin female SUB-D
: Asynchronous RS232C, 9600 bauds, 8 bits, 1 stop bit, no parity.
- NMEA messages format : GPRMC from NMEA 0183 V3.01
For detailed information about this output interface, refer to the appendix 19.1 and 19.1.2.
This datation source is defaulted to ‘Disabled’ by the factory settings.
NOTA: When this datation source is not used, it is strongly recommended to disable it (this is the
factory setting). See 13.7.3 NMEA Datation for External 1PPS.
9.4 SYNCHRONIZATION SOURCES MONITORING
The validity of the synchronization sources is monitored:
-
-
by the ALARMS signalling (see 11.2.2),
-
via the web interface (see 13.3.2.3 and 13.3.2.5),
-
via the SNMP service (see 14.1.1, SNMP parameters 14, 16 and 17).
10. OPERATIONAL TASKS
10.1 SELECTION OF THE SYNCHRONIZATION SOURCE
Two synchronization sources can be used to discipline the internal oscillator:
-
The integrated multi-GNSS synchronization source (or GNSS source, see 9.1)
-
An External 1PPS/NMEA synchronization source (see 9.2 and 9.3).
The GNSS source can be used as the main synchronization source and the External 1PPS/NMEA synchronization source as a backup synchronization source.
The EC20S automatically selects the synchronization source according to the following criteria:
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-
Whether the EC20S is set in ‘Forced Holdover’ mode or not (see 13.7.3 Force Holdover),
-
Whether a synchronization source is forced (see 13.7.3 Force a source as input),
-
Whether the synchronization source is enabled or disabled (see 13.7.3 Priority Level),
-
The status of the synchronization source (OK/Alarm, see 13.3.2.3 and 13.3.2.5),
-
The priority of the synchronization source (see 13.7.3 Priority Level).
10.2 DISCIPLINING ALGORITHM – SFN CONDITIONS
The algorithm is a phase/frequency locked loop-type disciplining algorithm. The phase measures are filtered by a Kalman filter.
The status of the disciplining process can be:
Warming up : Step performed after the power-up during which the internal oscillator is warming up. The oscillator control is not disciplined.
Tracking search : Fast oscillator disciplining with coarse adjustment of the oscillator command.
The EC20S is searching best disciplining conditions.
Locked
: Accurate oscillator disciplining with long-time constant filtering until the EC20S meets the ’Locked’ conditions defined as follows: the 10MHz frequency signals are cycle locked to the 1PPS synchronization source (10 000 000 cycles from the 10 MHz equals 1PPS period)* and meets a frequency accuracy better than 10
-9
(∆f/f) and a phase accuracy better than 1µs
(microsecond).
The ’Locked’ conditions are reached after a period depending on: o Whether the oscillator warming up is complete or not, o Whether the multi-GNSS synchronization source is ‘Locked’ or not (when this source is used), this point depending on the reception quality of the GNSS receiver, depending itself on the environmental conditions of the GNSS antenna location. Refer to the diagrams in the following paragraphs.
*note: By design, the 10MHz frequency signals are always cycle locked to the 1PPS synchronization source (10 000 000 cycles from the 10 MHz equals 1PPS period) apart from the
Tracking search periods.
Holdover : The oscillator disciplining has been suspended because there is no valid synchronization source to synchronize to. The oscillator control remains steady on the last valid value.
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Forced Holdover: The oscillator disciplining has been suspended upon user request (see 13.7.3
Force Holdover). The oscillator control remains steady on the last valid value.
Degraded : Hidden status occurring when all synchronisation sources are lost (and so the oscillator disciplining is suspended) while the oscillator disciplining was in ‘Locked’ status. If no synchronization source is selected before the end of a latency delay (factory programmable), an urgent alarm is raised and the oscillator disciplining transits to the ‘Holdover’ status. But if a synchronization source is selected before the end of the latency delay, the oscillator disciplining resumes (no alarm will be raised).
The SFN conditions are defined by the SFN Status (SFN ‘On’: the EC20S meets the SFN conditions; SFN
‘Off’: the EC20S doesn’t meet the SFN conditions) as follows:
Disciplining Status as defined just above
‘Warming up’
‘Tracking Search’
‘Locked’ (see just above for the definition of the ‘Locked’ conditions)
SFN Off
SFN Off
SFN On
‘Holdover’ coming from the ‘Tracking Search’ status SFN Off
‘Holdover’ coming from the ‘Locked’ status
SFN On
‘Holdover’ coming from the ‘Locked’ status
SFN Off
‘Forced Holdover’ SFN On
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10.3 SYNCHRONIZATION SIGNALS DISTRIBUTION
The distribution of the synchronization signals (1PPS, 10MHz) depends on the mute mode (defaulted to
‘Automatic’ mode, see 72 and 73).
In ‘Disabled’ mode, the synchronization signals (1PPS, 10MHz) are ALWAYS delivered (once the
Refer to the diagrams in the following paragraphs.
In ‘Automatic’ mode, the synchronization signals (1PPS, 10MHz) are delivered (once the initialization of the EC20S is complete) only if the EC20S meets the SFN conditions (i.e. when SFN Status is ‘On’, see
In ‘On Time’ mode, the synchronization signals (1PPS, 10MHz) are delivered (once the initialization of
the EC20S is complete) upon timeout conditions defined by 3 parameters 74, 75 and 76 at 13.7.5.
The presence of the distributed synchronization signals (1PPS, 10MHz) is monitored:
-
-
by the ALARMS signalling (see 11.2.1),
-
Using the web interface: see 13.3.2.7 and 13.3.3,
-
Using the SNMP interface: see 14.1.1, SNMP parameters 20 and 21.
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10.3.1 START-UP SEQUENCE DETAIL
Following diagrams show the status of the EC20S product during the start-up step (in brackets, the references of the status definitions):
POWER
GNSS Lock
Alarm (Searching for satellites)
T ss
Tracking
Init. Warm-Up
T init
T warm
Holdover Tracking Search
T ts
SFN Status
Mute mode is ‘Disabled’
Off
Off
Mute mode is
‘Automatic’
Off
On
OK (the GNSS source is Locked)
On
On
Locked on the GNSS source
T ss
Search for Satellites Time
T
T init warm
Initialization Time
Warm-Up Time
T ts
Tracking Search Time
5 minutes typical, depending on the GNSS signal reception quality.
Start of EC20S software: 2 minutes typical.
5 minutes typical, depending on the oscillator.
Depending on the synchronization source quality.
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10.3.2 SHORT LOSS OF THE GNSS SOURCE SEQUENCE DETAIL
Following diagrams show the status of the EC20S product while the GNSS source is lost (in brackets, the references of the status definitions):
POWER
GNSS Lock
OK (the GNSS
Alarm (Searching for satellites) source is Locked)
T gnssLoss
OK (the GNSS source is Locked)
T gnssAcq
Tracking
SFN Status
Phase or
Frequency
Accuracy
Mute mode is ‘Disabled’
Locked on the GNSS source
On
OK
On
Holdover Locked on the GNSS source
Mute mode is
‘Automatic’
On
T gnssLoss
GNSS Source Loss Time
Latency upon loss of the GNSS synchronization source: 120 seconds
T gnssAcq
GNSS Source Acquisition
Time
Latency upon acquisition of the synchronization source: 15 seconds
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10.3.3 SOURCE CHANGE SEQUENCE DETAIL
Following diagrams show the status of the EC20S product upon switching of synchronization source (in brackets, the references of the status definitions):
POWER
GNSS Lock
External
1PPS/NMEA
Tracking
Ref
OK (the GNSS source is Locked)
Locked
Alarm (Searching for satellites)
Locked on the GNSS source Tracking Search
T gnssLoss
Locked on the External 1PPS/NMEA source
SFN Status
Phase or
Frequency
Mute mode is ‘Disabled’
On
OK
On
Mute mode is
‘Automatic’
On
T gnssLoss
GNSS Source Loss Time
Latency upon loss of the GNSS synchronization source: 120 seconds
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10.3.4 HOLDOVER SEQUENCE DE TAIL
Following diagrams show the status of the EC20S product while there is no valid synchronization source
(in brackets, the references of the status definitions):
POWER
GNSS Lock
Tracking
SFN Status
Phase or
Frequency
Accuracy
Mute mode is ‘Disabled’
Mute mode is
‘Automatic’
OK (the GNSS
Alarm (Searching for satellites) source is Locked)
T gnssLoss
Locked on the GNSS source
T hold
Holdover
On
OK
On
On
OK (the GNSS source is Locked)
Tracking Search Locked on the GNSS source
Off
Alarm OK
Off On
T gnssLoss
GNSS Source Loss Time
T hold
Holdover Time
Latency upon loss of the GNSS synchronization source: 120 seconds
Time before phase or frequency alarms occur. Depending on the synchronization setup.
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11. SIGNALLING INTERFACES
EPSILON CLOCK MODEL EC20S
The EC20S incorporates two signalling interfaces:
-
A visual signalling, via three LEDs located on the front panel (see 11.1),
- An ALARMS signalling, via alarm signals output on the ‘ALARMS’ SUBD-9 connector located on
11.1 VISUAL SIGNALLING
POWER LED – ‘PWR’
Indicates the status of the AC and DC power supplies.
Red
Blinking
Indicates Initialisation of product.
Red
Indicates general fail of product.
Yellow
Indicates the missing of one power supply.
Green
Indicates presence of all power supplies.
SOURCE LED – ‘SRC’
Indicates the current status of the enabled synchronization source (GNSS source, External 1PPS/NMEA synchronization source).
Red
No synchronization source is present
Yellow
One or more synchronization source are not present. The unit use present source.
Green
All synchronization sources are present.
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DISTRIBUTION LED – ‘DST’
Indicates the current status of the distributed 1PPS and 10MHz signals.
Spectracom Corporation
Red
No distribution or error on 1PPS and 10MHz outputs.
Red
Blinking
No distribution on 1PPS or 10MHz outputs (the Mute function is enabled).
Yellow
Distributions of signals are provided without accuracy.
Green
Blinking
Distributions of signals are provided with accuracy. The EC20S is synchronized to the selected synchronization source.
NOTA: In operational step, all the LEDs are ‘Green’.
Only available synchronization sources should be enabled (see 9.2 and 9.3).
Only available AC/DC power alarms should be enabled (see 7.2).
11.2 ALARMS SIGNALING
- Number of Relay contacts : 2
- Maximum switching power
- Maximum switching voltage
- Maximum switching current
- Connector type
: 30 W, 62.5 VA (resistive load)
: Contacts Switch under max. load of 48VDC, 1A
: 1 A
: 9-pin female SUB-D
For detailed information about this output interface, refer to the appendix 19.2.
This SUB-D connector may be used to provide a control switch (dry relay contact) upon alarm
events. There are two relays to monitor two kinds of alarms:
- ‘Urgent Alarms’ which need an urgent intervention of the maintenance operator,
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- ‘Non-Urgent Alarms’ which need a non urgent intervention of the maintenance operator,
According to the selected wiring for the alarm monitor, a relay can be closed or open when an 'Urgent
Alarm' or a 'Non-Urgent Alarm' is raised. Refer to the pin-out of the SUB-D connector.
11.2.1 URGENT ALARMS
‘Urgent Alarms’:
- Internal oscillator fault,
- Internal 1PPS fault,
-
The ECS0S doesn’t meet the SFN conditions (see 10.2),
- A 1PPS output signals is in fault,
- A 10MHz output signal is in fault.
11.2.2 NON-URGENT ALARMS
‘Non-Urgent Alarms’:
-
GNSS Module fault (see 13.3.2.2 GNSS Module Status),
- External 1PPS synchronization source fault,
- External NMEA datation source fault,
- A power supply source (AC or DC) is missing,
- A synchronization source (GNSS source, External 1PPS/NMEA source) is in fault,
-
The EC20S is in ‘Holdover’ or ‘Forced Holdover’ mode (see 13.3.1 Tracking Status).
12. DISTRIBUTION INTERFACE
The EC20S distributes:
- 1PPS synchronization signals on the ‘Jn’ BNC connectors located on the rear panel,
- 10MHz synchronization signals on the ‘J2n’ BNC connectors located on the rear panel,
- Time Of Day messages on the ‘NMEA’ SUBD-9 connector located on the rear panel.
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12.1 1PPS OUTPUTS
- Number of outputs
- Connector type
- Level
- 1ppS pulse width
- Accuracy to UTC, GNSS locked
- Accuracy to UTC instantaneous (phase locked)
Holdover (constant temperature,
24 hours GNSS locked)
OXCO
after 4 hours 0.8 µs after 1 day 10 µs
Spectracom Corporation
: 7
: 50Ω BNC coaxial
: TTL/5V, with a 50
load.
: 100µS
: ± 25ns (1σ).
: ± 35ns max.
Rubidium oscillator
0.3 µs
2 µs
12.2 10MHZ OUTPUTS
- Number of outputs
- Connector type
- Level
- Type
: 7
: 50
BNC coaxial.
: 12±2dBm, with a 50
load.
: Sinewave signal, -40dBc harmonic distortion.
12.3 NMEA OUTPUT
The ‘NMEA’ output is a RS232 serial link on which Time Of Day messages are distributed.
- Connector type : 9-pin female SUB-D
- Port configuration
- TOD messages format
: Asynchronous RS232C, 9600 bauds, 8 bits, 1 stop bit, no parity.
: GPRMC from NMEA 0183 V3.01
For detailed information about this output interface, refer to the appendix 19.1 and 19.1.3.
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13. WEB INTERFACE
EPSILON CLOCK MODEL EC20S
To access the EC20S web interface, connect a Personal Computer (PC) to the EC20S Ethernet port and launch a HTTP navigator with the EC20S IP address.
The PC Operating System can be Windows or Linux.
The EC20S web interface has been tested with the following HTTP navigators:
- Firefox
- Internet Explorer
- Chrome
13.1 WELCOME PAGE
Click to enter the web site. The first displayed page is the Clock Status page.
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13.2 UPPER TASK BAR AND PAGE HEADER
Spectracom Corporation
This menu bar gives access to the following menus:
a. System Setup:
i. Network setup : Network connection parameters (protected by the administrator password) ii. SNMP setup : SNMP parameters and traps enable (protected by the administrator password) iii. Logout : Logout from the web site
b. Clock setup:
i. Time and Synchronization Source Setup
: Setting the time and synchronization parameters (protected by the administrator password) ii. GNSS Setup : GNSS reception parameters (protected by the administrator password) iii. Power Setup : Enable of power supply monitoring alarm (protected by the administrator password)
c. Clock Status: Summary of status and alarms of the EC20S
d. Tools
i. Events Logging ii. Software Versions iii. Software Upgrade iv. Admin v. Reboot
: Display of events history
: Display of current version of software parts
: Upgrading software
: Some services that reinitialize the EC20S
: Per module hardware reset
1. TIME OF DAY MESSAGE
A Time Of Day message is displayed in the header of the web pages in the following format:
<Date> <Time> <Timescale>
The <Date> format and the <Timescale> of the Time Of Day message can be set in the "Time and
Synchronization Source Setup” menu (see 13.7.2).
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2. TIMESCALE OF THE TIME OF DAY MESSAGE
The timescale associated with the Time Of Day message (displayed in the web pages header) is defined by an alphabetic character as follows:
- U: UTC timescale (either UTC-USNO from GPS constellation or UTC-SU from GLONASS constellation)
- L: Local Time = UTC timescale + programmed local time shift
- G: GPS timescale
- R: GLONASS timescale (Russia) = Moscow local time = UTC timescale + 3 hours
- E: GALILEO timescale (of the European positioning system)
- M: User-defined time (time Manually set in the "Time and Reference Setup” menu)
- N: No timescale (No available GNSS time information since the start-up)
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13.3 CLOCK STATUS PAGE
Spectracom Corporation
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This page is automatically refreshed every 8 seconds.
EPSILON CLOCK MODEL EC20S
13.3.1 GLOBAL STATUS
3. EC20S STATUS
Global working status of EC20S:
- OK Neither urgent alarm nor non-urgent alarm is raised. The distribution of the synchronization signals (1PPS, 10MHz) is OK.
- Warning
A non-urgent alarm is raised (refer to 11.2.1 to know the list of
the non-urgent alarms). The distribution of the synchronization signals (1PPS, 10MHz) is OK but a maintenance intervention is required.
The EC20S goes in this status when it is set in ‘Force Holdover’
- Alarm
An urgent alarm is raised (refer to 11.2.2 to know the list of the
urgent alarms). The distribution of the synchronization signals
(1PPS, 10MHz) may be wrong.
4. SFN STATUS
Indicates whether the EC20S meets the SFN conditions or not:
- On
- Off
EC20S meets the SFN conditions (see 10.2).
EC20S doesn’t meet the SFN conditions.
5. SYNCHRONIZATION SOURCE
Selected synchronization source for the module:
- GNSS
- External
1PPS signal of the integrated GNSS receiver.
External 1PPS signal (BNC rear panel input).
- None EC20S in ‘Holdover’ or ‘Forced Holdover’ mode.
6. OSCILLATOR CONTROL VOLTAGE
Control voltage of the internal oscillator (in volts).
Range from 0V to 8V.
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Generates an Internal Oscillator alarm when the value reaches 0V or 8V, meaning that the
EC20S is no longer able to drive the Internal Oscillator.
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7. TRACKING STATUS
EPSILON CLOCK MODEL EC20S
Disciplining algorithm status:
- Warming up The EC20S internal oscillator is warming up.
- Tracking search
- Locked
- Holdover
The EC20S receiver is searching best disciplining conditions.
The EC20S receiver meets the ‘Locked’ conditions (see 10.2).
The oscillator disciplining has been suspended because there is no valid synchronization source to synchronize to.
- Forced Holdover The oscillator disciplining has been suspended upon user
request (see 13.7.3 Force Holdover).
8. SYNCHRONIZATION TIME
Time during which the EC20S is synchronized to a valid synchronization source. Unity: second.
13.3.2 ALARMS
13.3.2.1 SOURCE DISCIPLINING : <TYPE OF OSCILLATOR>
9. TYPE OF OSCILLATOR
Type of the built-in oscillator:
- Unknown The built-in oscillator is not detected.
- OCXO
- Rubidium
10. INTERNAL OSCILLATOR
The built-in oscillator is an OCXO oscillator.
The built-in oscillator is a Rubidium oscillator.
Monitored status of the 10MHz generated by internal oscillator:
- OK Frequency driver operational.
- Alarm
11. INTERNAL 1PPS
Frequency driver failure.
Monitored status of internal 1PPS generated from oscillator frequency:
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- OK 1PPS driver operational.
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- Alarm 1PPS driver failure.
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13.3.2.2 SYNCHRONIZATION
12. PHASE ACCURACY
Status of the estimated phase accuracy during a holdover period:
- OK The phase accuracy is below the Alarm Phase Threshold (see
- Alarm The phase accuracy is above the Alarm Phase Threshold (see
13. FREQUENCY ACCURACY
Status of the estimated frequency accuracy during a holdover period:
- OK
- Alarm
The frequency accuracy is below the Alarm Frequency Threshold
The frequency accuracy is above the Alarm Frequency Threshold
13.3.2.3 GNSS SOURCE
14. GNSS LOCK
Performance of the 1PPS signal of the GNSS receiver:
- OK
- Alarm
1PPS signal of the GNSS receiver can be used as 1PPS reference signal for disciplining operation.
1PPS signal of the GNSS receiver can’t be used as 1PPS reference signal for disciplining operation.
15. ANTENNA STATUS
State of the connection to the GNSS antenna:
- Unpowered
- Powered
- Shorted
GNSS antenna is disconnected or incorrectly powered. Use of an antenna splitter produces this message. No alarm generated for this reason.
GNSS antenna is connected and correctly powered.
GNSS antenna is in short-circuit status.
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13.3.2.4 GNSS MODULE STATUS
EPSILON CLOCK MODEL EC20S
Working state of the GNSS receiver:
- OK The GNSS receiver is working well.
- Alarm Problem with the GNSS receiver. The communication with the
GNSS receiver is interrupted or the 1PPS signal is not delivered by the GNSS receiver.
13.3.2.5 EXTERNAL SOURCES
16. EXTERNAL 1PPS
Status of the external 1PPS source:
- OK The External 1PPS source is valid.
- Alarm
- Disabled
The External 1PPS source is not valid.
The External 1PPS source is disabled by the user (See 13.7.3
Synchronization Setup).
17. EXTERNAL NMEA DATATION
Status of the external NMEA datation source:
- OK
- Alarm
- Disabled
The NMEA datation source is valid.
The NMEA datation source is not valid.
The NMEA datation is disabled by the user (See 13.7.3
Synchronization Setup).
13.3.2.6 POWER SUPPLY
18. AC
Status of AC power:
- OK
- Alarm
- Disabled
AC power is present.
AC power is missing.
AC power alarm is disabled by the user (See 13.9 Power Setup).
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19. DC
Status of DC power:
- OK
- Alarm
- Disabled
DC power is present.
DC power is missing.
Spectracom Corporation
DC power alarm is disabled by the user (See 13.9 Power Setup).
13.3.2.7 DISTRIBUTION
20. GLOBAL 10 MHZ OUTPUTS
Monitoring of the frequency output signals delivered by the EC20S:
- OK
- Alarm
- Mute
Every 10MHz output delivers a valid signal.
At least one 10MHz output doesn’t deliver a valid signal.
The 10Mhz output doesn’t deliver any signal; shut off for
frequency accuracy alarm (see 13.7.3) or time conditions (see
21. GLOBAL 1PPS OUTPUTS
Monitoring of the 1PPS output signals delivered by the EC20S:
- OK
- Alarm
- Mute
Every 1PPS output delivers a valid signal.
At least one 1PPS output doesn’t deliver a valid signal.
The 1PPS output doesn’t deliver any signal; shut off for phase
accuracy alarm (see 13.7.3) or time conditions (see 13.7.5).
13.3.3 OUTPUT STATUS
State of the signals delivered by the EC20S:
- OK The 10MHz/1PPS output delivers a valid signal.
- Alarm
- Mute
- Disabled
The 10MHz/1PPS output delivers an invalid signal.
The 10MHz/1PPS output doesn’t deliver any signal.
The 10MHz/1PPS output is not available in the EC20S device model.
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13.3.4 GNSS STATUS
EPSILON CLOCK MODEL EC20S
22. GNSS RECEIVER MODEL
The GNSS receiver model implemented in the EC20S equipment is displayed in the “GNSS
Status” header.
23. GNSS LONGITUDE
Current longitude of the GNSS antenna.
24. GNSS LATITUDE
Current latitude of the GNSS antenna.
25. GNSS ALTITUDE
Current altitude of the GNSS antenna.
26. SELF SURVEY
Not applicable in ‘Stationary’ and ‘Mobile’ GNSS modes (see 78).
In ‘Automatic’ GNSS mode, the Self Survey status reports the progression of the period during which the accurate position of the stationary GNSS antenna is computed by the
EC20S (see 78). The following information can be seen:
- x% < 100% The calculation of the accurate GNSS antenna position is in progress.
- 100% The calculation of the accurate GNSS antenna position is complete.
27. USED SATELLITES
Number of GNSS channels used by the GNSS receiver to compute the time and/or the position.
28. CONSTELLATIONS
Satellites constellations:
- GPS
- GLONASS
- GALILEO
Global Positioning System (USA positioning system).
GLObalnaya NAvigatsionnaya Sputnikovaya Sistema (Russian positioning system).
European positioning system.
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29. USED SATELLITES
Spectracom Corporation
Number of GNSS channels, per satellites constellation, used by the GNSS receiver to compute the time and/or the position.
30. BEST SATELLITES
ID / SNR:
Satellite channel identifier and SNR (Signal over Noise Ratio) of the 8 best satellite channels tracked by the GNSS receiver.
13.3.4.1 EXTERNAL NMEA DATATION
31. NMEA LONGITUDE
Current longitude of the NMEA input.
32. NMEA LATITUDE
Current latitude of the NMEA input.
33. NMEA ALTITUDE
Current altitude of the NMEA input.
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13.4 ADMINISTRATOR PASSWORD PAGE
EPSILON CLOCK MODEL EC20S
An administrator password (called ‘Admin’ password) is necessary to access the setup pages. The
default password is ‘pwd’. It can be modified in the “Admin” page (see 13.13).
WARNING
If the user doesn’t remember the password, the
EC20S product must come back to Spectracom to reset the device to its default password.
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13.5 NETWORK SETUP PAGE
This page allows the user to modify the Network settings.
34. HOST NAME
Unique name of the EC20S in the network. This functionality depends on the DNS server type. NOTA: The header of the EC20S Application Window is built as follows: <Host name> -
EC20S.
35. USE DHCP (DYNAMIC HOST CONFIGURATION PROTOCOL)
Yes A Dynamic Host Configuration Protocol service is available. In this case, a dynamic IP address is automatically allocated to the EC20S by the DHCP server according to the EC20S MAC address. The other input fields do not apply.
When the DHCP service is required (‘Use DHCP’=’Yes’), if the EC20S starts without network connection, the static IP address is set. After the network connection is restored, a 1 or 2 minutes delay occurs before a dynamic IP address is assigned.
No No Dynamic Host Configuration Protocol service is available. In this case, the static IP address is allocated to the EC20S and the other input fields are applied to configure the network access.
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36. IP ADDRESS, SUB-NETWORK MASK, SUB-NETWORK ADDRESS, BROADCAST ADDRESS,
DEFAULT GATEWAY:
When the DHCP service is not required (‘Use DHCP’=’No’), these input fields are applied to configure the network access.
NOTA: The network configuration can be reset to factory settings at any time while pressing, more than 2 seconds, the ‘Factory Reset’ button located on the front panel between the ‘PWR’ and ‘SRC’
LEDs. To press the button, insert a straightened paperclip into the hole.
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13.6 SNMP & TRAPS SETUP PAGE
Spectracom Corporation
In this page, the operator can enable/disable the SNMP traps generation and program the Read Only
(RO) and the Read Write (RW) SNMP communities. The SNMP traps report an event (an alarm, the end of an alarm or a new setup) by sending a trap message.
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37. SNMP RO COMMUNITY
EPSILON CLOCK MODEL EC20S
Read Only community (for GET SNMP commands). Defaulted to ‘public’.
38. SNMP RW COMMUNITY
Read Write community (for SET SNMP commands). Defaulted to ‘private’. RO and RW communities will become effective after a software reboot of the EC20S device (see Tools menu).
39. TRAP COMMUNITY
Trap community (for trap events). Needed to easily identify a family of monitored devices.
Defaulted to ‘public’.
40. IP ADDRESS TRAPS DESTINATION 1
Primary SNMP manager address where traps will be sent. Clear this field to disable the traps transmission to this address.
41. IP ADDRESS TRAPS DESTINATION 2
Secondary SNMP manager address where EC20S traps will be sent. Clear this field to disable the traps transmission to this address.
42. GLOBAL TRAPS ENABLE
- Yes
- No
Traps are sent according to individual enabling.
No trap is generated.
43. EC20S FAULT
- Yes Generates a trap when the EC20S goes on default (according to
"Global Status").
No trap is generated. - No
44. GNSS FAULT
- Yes
- No
Generates a trap when the GNSS receiver fails or unlocks
(according to "GNSS Locked").
No trap is generated.
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45. EXTERNAL 1PPS FAULT
- Yes
- No
Spectracom Corporation
Generates a trap when the External 1PPS is lost (while enabled).
No trap is generated.
46. NMEA FAULT
- Yes
- No
Generates a trap when the NMEA input is lost (while enabled).
No trap is generated.
47. INTERNAL OSCILLATOR FAULT
- Yes Generates a trap when the frequency driver goes on alarm
(generally the oscillator goes on default).
- No
48. INTERNAL 1PPS FAULT
No trap is generated.
- Yes Generates a trap when the 1PPS driver goes on alarm.
- No
49. PHASE ACCURACY FAULT
- Yes
No trap is generated.
- No
Generates a trap when estimated phase of the output signal exceeds the phase limit.
No trap is generated.
50. FREQUENCY ACCURACY FAULT
- Yes Generates a trap when estimated frequency of the output signal exceeds the phase limit.
- No No trap is generated.
51. SYNCHRONIZATION SOURCE CHANGE
- Yes Generates a trap when the source of synchronization changes.
- No No trap is generated.
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52. TRACKING STATUS
- Yes
- No
53. POWER FAULT
- Yes
Generates a trap when the tracking status changes.
No trap is generated.
EPSILON CLOCK MODEL EC20S
Generates a trap when any enabled power source alarm is detected.
No trap is generated. - No
54. 1PPS OUTPUT FAULT
- Yes
- No
55. 10 MHZ OUTPUT FAULT
- Yes
Generates a trap when one of the 1PPS output signal fails.
No trap is generated.
Generates a trap when one of the 10 MHz output signal fails.
- No
56. DOWNLOAD MIB LINK
No trap is generated.
Right click on the ‘Download MIB’ link to download the MIB description file. A left click only displays the MIB description file.
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13.7 TIME & SYNCHRONIZATION SOURCE SETUP PAGE
Spectracom Corporation
This page is used for setting time computation and display parameters, synchronization source parameters, and distribution parameters.
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13.7.1 USER-DEFINED DATATION
57. DATE, TIME AND DATATION SUBMISSION BUTTON
Time can be set by the user when the EC20S is in ‘Forced Holdover’ mode or when the
EC20S has not been synchronized yet to a datation source (GNSS source, External NMEA datation source).
58. DATATION ADJUSTMENT
Adjust the time by 1 second when the EC20S is in ‘Forced Holdover’ mode or when the
EC20S has not been synchronized yet to a datation source (GNSS source, External NMEA datation source). Helpful to adjust the time manually set by the user.
13.7.2 DATATION SETUP
59
59. FORMAT OF THE DISPLAYED DATATION
Format of the displayed Time of Day messages:
- DD/MM/AAAA day / month / year
- MM/DD/AAAA
- DD/AAAA month / day / year day of the year / year
60. TIMESCALE OF THE DISTRIBUTED TOD
Timescales applied to the distributed Time of Day messages (i.e. for ToD displayed on the
web pages 13.2 and ToD delivered on the ‘NMEA’ output by the NMEA 0183 v3.01 GPRMC
- UTC UTC timescale (either UTC-USNO from GPS constellation or UTC-
SU from GLONASS constellation).
- Local
- GPS
Local Time = UTC timescale + programmed local time shift.
GPS timescale.
- GLONASS GLONASS timescale (Russia) = Moscow local time = UTC timescale + 3 hours
- GALILEO GALILEO timescale (of the European positioning system).
For ToD messages on the web pages, see 13.2 Upper Task Bar and Page Header description.
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61. USER-DEFINED LEAP SECOND
Spectracom Corporation
Leap second adjustment set by the user, hence ensuring it will be applied even in case of
GNSS loss. Direction in which the leap second shall be applied:
- 0
- –1
Non leap second pending
Positive leap second pending
- +1 Negative leap second pending
62. USER-DEFINED LEAP SECOND DATE
Leap second date set by the user, hence ensuring it will be applied even in case of GNSS loss. Date when to apply the leap second:
- 31/03
- 30/06
31/03
30/06
- 30/09
- 31/12
30/09
31/12
63. OFFSET FOR LOCAL TIME (HH:MM)
Time shift between the local time and the UTC time. Unity: hours and minutes.
64. 1PPS PHASE OFFSET
Phase shift applied to the 1PPS output. Unity: Nanosecond. Range = [–500 milliseconds,
+500 milliseconds]. Default is 0.
13.7.3 SYNCHRONIZATION SETUP
65. FORCE HOLDOVER
Keep the oscillator control voltage at a fixed value even if a synchronization reference is available:
- On
- Off
Force the EC20S into the ‘Holdover’ mode (the oscillator disciplining is suspended). The EC20S goes in ‘Warning’ status
when it is set in this mode.
Normal disciplining mode (the oscillator disciplining is in progress)
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66. PRIORITY LEVEL: GNSS
Priority of the GNSS synchronization source:
- Priority 1 Highest priority
- Priority 2
- Priority 3
- Disabled
Medium priority
Lowest priority
EPSILON CLOCK MODEL EC20S
Disable the source; this source is no longer part of the synchronization sources; no corresponding alarm.
67. PRIORITY LEVEL: EXTERNAL 1PPS/NMEA
Priority of the External 1PPS/NMEA synchronization source:
- Priority 1
- Priority 2
- Priority 3
Highest priority
Medium priority
Lowest priority
- Disabled Disable the source; this source is no longer part of the synchronization sources; no corresponding alarm.
68. FORCE A SOURCE AS INPUT
Force the EC20S to be synchronized to the selected source even if other synchronization sources with a highest priority are available and, CAUTION, even if the selected source is in
‘Alarm’ state (for debug purposes only):
- None
- GNSS
No synchronization source
GNSS synchronization source
- External 1PPS/NMEA External 1PPS/NMEA synchronization source
69. NMEA DATATION FOR EXTERNAL 1PPS:
External NMEA datation to timestamp the External 1PPS synchronization source:
- Yes
- No
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70. ALARM PHASE THRESHOLD
Spectracom Corporation
Threshold for the Phase Accuracy, used during a holdover period, to determine whether the
1PPS signals are still valid (the estimated phase accuracy is below the threshold) or not (the
estimated phase accuracy is above the threshold). See 13.3.2.2. Unity: nanosecond.
Range=[0, 100000]. Default is 10.
Specific value: If the field is zeroed: No alarm is generated – The Threshold function is disabled and the OID ec20S-STA-PHASE-ERROR (MIB
VARIABLE) remains set to 1.
71. ALARM FREQUENCY THRESHOLD
Threshold for the Frequency Accuracy, used during a holdover period, to determine whether the 10MHz signals are still valid (the estimated frequency accuracy is below the
threshold) or not (the estimated frequency accuracy is above the threshold). See 13.3.2.2.
Unity: None (∆f/f * 10
-9
). Range=[0, 1000] * 10
-9
. Default is 1000 * 10
-9
.
Specific value: If the field is zeroed: Frequency alarm is immediately generated
(meaning that synchronization is lost). The OID ec20S-STA-
FREQ-ERROR (MIB VARIABLE) remains set to 0.
13.7.4 DISTRIBUTION SETUP
72. MUTE MODE FOR 1PPS
The mute mode for the output 1PPS signals:
- Disabled Output 1PPS signals are always distributed whatever their quality is.
- Automatic
- On Time
Output 1PPS signals are muted upon SFN conditions when SFN
Output 1PPS signals are muted upon time conditions (see
- Until Stable
- Until 1 st
Sync
Output 1PPS signals are muted until they are stable (i.e. after their frequency have been adjusted a first time).
Output 1PPS signals are muted until the EC20S meets the SFN conditions. Once the EC20S have met the SFN conditions for the first time, the output 1PPS signals are always distributed whatever their quality is.
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73. MUTE MODE FOR 10MHZ
EPSILON CLOCK MODEL EC20S
The mute mode for the output 1PPS signals:
- Disabled Output 10MHz signals are always distributed whatever their quality is.
- Automatic Output 10MHz signals are muted upon SFN conditions when
SFN Status is ‘Off’ (see 10.2).
- On Time
- Until Stable
- Until 1 st
Sync
Output 10MHz signals are muted upon time conditions (see
Output 10MHz signals are muted until they are stable (i.e. after their frequency have been adjusted a first time).
Output 10MHz signals are muted until the EC20S meets the SFN conditions. Once the EC20S have met the SFN conditions for the first time, the output 10MHz signals are always distributed whatever their quality is.
13.7.5 DISTRIBUTION STATUS FOR “ON TIME” MUTE MODE
When this mute mode is selected (see 13.7.4), the 3 conditions defined below (74, 75 and 76) are
evaluated all together to determine whether the output synchronization signals (1PPS, 10MHz) are distributed or not. Setting the special value ‘0’ to a mute mode inhibits this mode.
74. MUTE AFTER LOSS OF SYNC SOURCES
This delay starts upon the loss of all the synchronization sources. The distributed synchronization signals (1PPS, 10MHz) are muted once this delay has elapsed. Unity: second.
75. ENABLE AFTER STARTUP
This delay starts upon the start-up of the EC20S. The synchronization signals (1PPS, 10MHz) are muted during this delay and are distributed once this delay has elapsed. Unity: second.
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76. ENABLE AFTER LOCK OF A SYNC SOURCE
Spectracom Corporation
This delay starts upon the selection of a valid synchronization source (if no synchronization source was selected before). The synchronization signals (1PPS, 10MHz) are distributed once this delay has elapsed. Unity: second.
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13.8 GNSS SETUP PAGE
On this page, the operator set the GNSS receiver parameters.
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77. GNSS ANTENNA DELAY
Time shift that compensates the propagation delay of the GNSS signal through the antenna cable. To be computed according to the type and the length of cable. Unity: nanosecond.
78. GNSS MODE
Defines the way to determine the GNSS antenna position:
- Automatic The GNSS antenna is stationary and its position is automatically computed by the EC20S. The EC20S gets the current antenna position from the GNSS receiver every second for one hour. A current position is selected as valid if the GNSS receiver is tracking a minimum of 4 satellite channels. The progression of the one hour period is displayed by the “Self Survey” status of the “Clock Status” web page. Once the one hour period is complete, the antenna position is determined while computing the average of all the recorded antenna positions. The accurate position so determined is then set in the GNSS receiver which
User’s Manual
EPSILON CLOCK MODEL EC20S Spectracom Corporation then transits to 0D reception mode. That means that the GNSS receiver tracks only one satellite channel and then improves the accuracy of the time.
- Stationary
- Mobile
The GNSS antenna is stationary and its accurate position is input by the user. The accurate position so input is then set in the
GNSS receiver which then transits to 0D reception mode. That means that the GNSS receiver tracks only one satellite channel and then improves the accuracy of the time.
The GNSS antenna is not stationary. The GNSS receiver computes and delivers the antenna position every second so that the EC20S (with the GNSS antenna) can be moved. In this case, the GNSS receiver doesn’t transit to the 0D reception mode.
79. GNSS LATITUDE, GNSS LONGITUDE, GNSS ALTITUDE
Geographical coordinates of the stationary GNSS antenna position that is applied in the
GNSS Stationary mode (see above GNSS Mode).
Unity: Latitude and Longitude in degrees-minutes-seconds-milliseconds (for the web interface) and milliseconds only (for the SNMP interface). Altitude in meters (for both web and SNMP interface).
80. GPS CONSTELLATION
Defines whether the GPS satellites constellation is part of the GNSS synchronization source or not:
- Yes The GPS satellites constellation is part of the GNSS synchronization source.
- No
81. GLONASS CONSTELLATION
Defines whether the GLONASS satellites constellation is part of the GNSS synchronization source or not.
- Yes The GLONASS satellites constellation is part of the GNSS synchronization source.
- No
The GPS satellites constellation is not part of the GNSS synchronization source.
The GLONASS satellites constellation is not part of the GNSS synchronization source.
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If the input field is greyed, that means that your EC20S device doesn’t include the
GLONASS license.
82. GALILEO CONSTELLATION
Defines whether the GALILEO satellites constellation is part of the GNSS synchronization source or not:
- Yes The GALILEO satellites constellation is part of the GNSS synchronization source.
- No The GALILEO satellites constellation is not part of the GNSS synchronization source.
If the input field is greyed, that means that your EC20S device doesn’t include the GALILEO license.
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13.9 POWER SETUP PAGE
Spectracom Corporation
According to actual power supply connection, the operator must set which power alarm (AC or DC, left and right) should be enabled.
83. AC POWER
Check AC power supply:
- Enable:
- Disable:
84. DC POWER
Check DC power supply:
- Enable:
- Disable:
Generates an alarm if AC power supply is not available.
No alarm generated.
Generates an alarm if DC power supply is not available.
No alarm generated.
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13.10 EVENTS LOGGING
EPSILON CLOCK MODEL EC20S
This page displays the events log recorded by the EC20S in a chronological order.
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13.10.1 EVENT ORIGIN
The Module column of the events log indicates the event origin:
-
EC20S
-
CLOCK RIGHT
General EC20S event (event coming from the Management Board which is the EC20S main board),
Event coming from the right clock,
-
CLOCK LEFT Event coming from the left clock.
13.10.2 EVENT GRAVITY
The events are classified according to a gravity criterion:
-
-
Alarm
Warning
The event reports a temporary or permanent dysfunction of a major function and can affect the normal functioning of the EC20S.
The event reports a temporary or permanent dysfunction of a minor or redundant function and therefore doesn’t affect the normal functioning of the EC20S.
-
Information The event reports the end of an alarm or a warning event, or a user action.
Alarm and Warning events refer to status displayed on the Clock Status web page.
13.10.3 EVENTS LOG FILTERING
The events log can be filtered and displayed according to the gravity criterion by the mean of the Display Filter.
Display Filter
Max lines
To select the filtering criteria to be applied to the events log.
To define the number of events per page to be displayed.
”<”,”<<”,”>", “>>” Press these buttons to navigate through the whole events log.
“Update List” Press this button to refresh the display of the events log.
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13.10.4 CLEAR EVENTS LOG
Click on the ‘Clear events log’ button to clear the events log buffer.
13.10.5 DOWNLOAD EVENTS LOG
Right click on the ‘Download events log’ link to download the events log. A left click only displays the whole events log.
13.11 SOFTWARE VERSION
This page displays the version number of key software and firmware components.
85. MOTHER BOARD SOFTWARE COMPONENTS VERSION
Archive version: Version of the EC20S software.
System version: Version of the EC20S system.
Firmware version: Version of the firmware of the EC20S FPGA.
86. GNSS FIRMWARE VERSION
Firmware version of the built-in GNSS receiver.
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13.12 SOFTWARE UPGRADE
This page allows to upgrade the EC20S software.
Spectracom Corporation
WARNING
Extracted configuration archive file (see 13.13.3) shall not be
uploaded.
These files only aim at providing trouble-shooting support data.
To upgrade the EC20S software, follow these steps:
-
Select the software archive to upload (usually a .tgz file provided by the manufacturer) with the browser button.
-
Click on the ‘Upload File’ button to start the uploading.
-
Uploading is complete when the below screen is displayed:
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Then start the next software installation on the EC20S target while clicking on the ‘Install’ button.
Once the new software is installed, the EC20S automatically reboots.
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13.13 ADMIN PAGE
Spectracom Corporation
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13.13.1 SYSTEM RESET
To reinitialize the EC20S operational settings, two ways are possible:
87. RESET TO DEFAULT SETUP
Click on the ‘Activate’ button to reset the EC20S current settings to the factory settings.
Note that the network settings are not reset.
WARNING
ALL the setup parameters (except the network parameters)
are reset to their factory setting.
Resetting to default setup may disturb the 1PPS and 10MHz
distribution !
Reset to default setup + Clear events log:
Click on the ‘Activate’ button to reset the EC20S current settings to the factory settings and clear the events log.
Note that the network settings are not reset.
13.13.2 PASSWORD CHANGE
To change the Admin password, the password that is required to access the setup pages.
88. NEW PASSWORD
To enter a new password.
89. CONFIRM NEW PASSWORD
To enter the password a second time to check the user input.
Click on the ‘Save configuration’ button to save the new password. Password change closes the session.
13.13.3 CONFIGURATION EXTRACTION
To extract the EC20S settings in a configuration archive file.
Click on the ‘Extract’ button to copy the EC20S settings in the configuration archive file
Ec20s_configuration_archive_file.tgz.
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Right click on the ‘Download Configuration Archive File’ button to download the configuration archive file Ec20s_configuration_archive_file.tgz from the EC20S device.
WARNING
Extracted configuration archive file aims at providing trouble-shooting support data.
It doesn't aim at restoring an EC20S configuration.
Extracted configuration archive files shall not be uploaded from the
Software Upgrade web page (13.12).
13.14 REBOOT
If the unit can’t be accessed via a network service (web pages, SNMP, NTP) any more, the operator can order a ‘Network’ reboot to restart the network services (telnet, FTP, SNMP, NTP).
If the unit seems to be out of order, despite a ‘Network’ reboot, the operator can order a ‘Software’ or a ‘Hardware’ reboot.
A ‘Hardware’ reboot:
- erases the memory components,
- restarts the EC20S software,
-
stops the signals distribution (1PPS, 10MHz)
.
WARNING
Hardware reboot stops signals distribution.
Take care about your choice.
A ‘Software’ reboot:
- restarts the EC20S software,
-
doesn’t stop the signals distribution (1PPS, 10MHz)
.
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To order a reboot, select the type of reboot and click on ‘Yes’ to confirm the reboot.
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14. SNMP INTERFACE
Spectracom Corporation
To access the EC20S SNMP interface, connect a Personal Computer (PC) to the EC20S Ethernet port and launch a SNMP browser with the EC20S IP address.
The PC Operating System can be Windows or Linux.
14.1 MIB DESCRIPTION
The MIB description file defines the SNMP objects through which the EC20S device can be remotely monitored using the SNMP protocol. The MIB description file can be downloaded in the “SNMP & Traps
setup” web page (see 13.6). The EC20S implements the v2c release of the SNMP protocol. The MIB
includes the following SNMP objects:
14.1.1 SNMP STATUS PARAMETE RS
Status parameters can only be read (using the GET method). These parameters have a read-only access authenticated by the read-only community (which is defaulted to ‘public’).
Refer to the MIB Description file to get detailed information about each parameter (unity, values definition, values range) under the ‘DESCRIPTION’ section.
CLOCK STATUS OID
ec20s-STA-HARDWARE-OK ec20s-STA-DATETIME ec20s-STA-TIMEREF ec20s-STA-SYNCSOURCE ec20s-STA-SYNCTIME ec20s-STA-1PPSOUT
ec20s-STA-1PPSOUT-FAILURE
ec20s-STA-10MHZOUT
ec20s-STA-10MHZOUT-FAILURE
ec20s-STA-FREQ-ERROR ec20s-STA-FREQ-ALARM
Description (Ref.)
Obsolete
Obsolete
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ec20s-STA-OPT-IRIG-OUT ec20s-STA-OPT-STANAG-OUT ec20s-STA—OPT-2MHZ-OUT
ec20s-STA—SFN ec20s-STA-TYPE-OSCILLATEUR
EPSILON CLOCK MODEL EC20S
Obsolete
Obsolete
Obsolete
90. PHASE ERROR
Phase error estimated by the Kalman filter (kdt) implemented by the disciplining algorithm.
91. FREQUENCY ERROR
Frequency error estimated by the Kalman filter (kdf) implemented by the disciplining algorithm.
GPS STATUS OID
ec20s-GPS-LOCKED
ec20s-GPS-SAT-LOCKED ec20s-GPS-SAT-ID1 ec20s-GPS-SAT-SNR1 ec20s-GPS-SAT-ID2 ec20s-GPS-SAT-SNR2 ec20s-GPS-SAT-ID3 ec20s-GPS-SAT-SNR3
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Description (Ref.)
Deprecated
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EPSILON CLOCK MODEL EC20S ec20s-GPS-SAT-ID4 ec20s-GPS-SAT-SNR4 ec20s-GPS-SAT-ID5 ec20s-GPS-SAT-SNR5 ec20s-GPS-SAT-ID6 ec20s-GPS-SAT-SNR6 ec20s-GPS-SAT-ID7 ec20s-GPS-SAT-SNR7 ec20s-GPS-SAT-ID8 ec20s-GPS-SAT-SNR8 ec20s-GPS-SAT-ANTENNA-MODE ec20s-GPS-RECEPTION-MODE ec20s-GPS-ANTENNA-STATUS ec20s-GPS-LATITUDE ec20s-GPS-LONGITUDE ec20s-GPS-ALTITUDE
Spectracom Corporation
92. GNSS RECEPTION MODE
Reception mode (or Tacking mode) of the GNSS receiver:
-
0D: The GNSS receiver tracks only one satellite channel. This is the mode in which the GNSS receiver transits once it has computed the accurate position of the GNSS antenna (in
‘Automatic’ GNSS mode, see 78), or once the user has input the accurate position of the
GNSS antenna (in ‘Stationary’ GNSS mode, see 78).
-
2D: The GNSS receiver tracks three satellite channels (in ‘Mobile’ GNSS mode, see 78).
-
3D: The GNSS receiver tracks at least four satellite channels (in ‘Mobile’ GNSS mode, see
NTP STATUS OID
ec20s-NTP-MAC-ADDRESS
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Description (Ref.)
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93. EC20S MAC ADDRESS
MAC address of the EC20S.
94. NTP STRATUM LEVEL
Stratum level got from the NTP service of the EC20S.
EPSILON CLOCK MODEL EC20S
GNSS STATUS OID
ec20s-GNSS-STA-MODEL ec20s-GNSS-FW-VERSION ec20s-GNSS-STA-SAT-USED-ALL ec20s-GNSS-STA-SAT-USED-GPS ec20s-GNSS-STA-SAT-USED-GLONASS ec20s-GNSS-STA-SAT-USED-GALILEO
Description (Ref.)
14.1.2 SNMP CONFIGURATION P ARAMETERS
Configuration parameters can be read (using the GET method) and modified (using the SET method).
These parameters have a read-write access authenticated by the read-write community (which is defaulted to ‘private’).
Refer to the MIB Description file to get detailed information about each parameter (unity, values definition, values range, factory setting) under the ‘DESCRIPTION’ section.
TRAPS CONFIGURATION OID
ec20s-TRAPS-DESTINATION-1 ec20s-TRAPS-DESTINATION-2 ec20s-TRAPS-COMMUNITY ec20s-TRAPS-ENABLE
Description (Ref.)
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EC20S CONFIGURATION OID
ec20s-CFG-FREQ-ALARM-LIMIT ec20s-CFG-PHASE-ALARM-LIMIT ec20s-CFG-DATE-FORMAT ec20s-CFG-1PPS-MUTE-AUTO ec20s-CFG-10MHZ-MUTE-AUTO ec20s-CFG-MUTE-LOST-SOURCES-TIME ec20s-CFG-MUTE-POWER-ON-TIME ec20s-CFG-MUTE-ACQ-SOURCE-TIME ec20s-CFG-RESTART-INETD ec20s-CFG-RESTART-NTP ec20s-CFG-RESTART-WEB ec20s-CFG-RESTART-EC20S
Spectracom Corporation
95. RESTART INETD
1: the EC20S restarts the inetd network services (telnet, FTP, uptime).
96. RESTART NTP
1: the EC20S restarts the NTP network service.
97. RESTART WEB
1: the EC20S restarts the web pages network service (HTTP).
98. RESTART EC20S
1: the EC20S unit restarts.
Description (Ref.)
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GNSS CONFIGURATION OID
ec20s-GNSS-CFG-ANTENNA-MODE ec20s-GNSS-CFG-ANTENNA-LATITUDE ec20s-GNSS-CFG-ANTENNA-LONGITUDE ec20s-GNSS-CFG-ANTENNA-ALTITUDE ec20s-GNSS-CFG-GPS-CONSTELLATION-MODE ec20s-GNSS-CFG-GLONASS-CONSTELLATION-MODE ec20s-GNSS-CFG-GALILEO-CONSTELLATION-MODE
EPSILON CLOCK MODEL EC20S
Description (Ref.)
14.1.3 SNMP TRAPS
Trap events are asynchronous SNMP messages sent by the EC20S upon changes of some configuration parameters or when an alarm is raised or cancelled. These parameters have an accessible-for-notify access authenticated by the Trap community (which is defaulted to ‘public’).
Traps are sent by the EC20S to destination addresses which can be set via the “SNMP Setup” web page
or via the SNMP protocol (see 14.1.2 TRAPS CONFIGURATION or 14.1.2 SNMP CONFIGURATION
PARAMETERS).
Traps are sent by the EC20S if the Traps transmission is enabled. The Traps transmission can be enabled/disabled via the “SNMP Setup” web page. Each trap event can also be enabled/disabled via the same web page.
Refer to the MIB Description file to get detailed information about each trap (values definition, values range) under the ‘DESCRIPTION’ section.
TRAP OID
ec20sGeneralHardwareFault ec20sGpsFault ec20sExternalPpsFault ec20sNmeaFault
Description (Ref.)
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EPSILON CLOCK MODEL EC20S ec20sInternalOscFault ec20sInternalppsFault ec20sPhaseAccuracyFault ec20sFreqAccuracyFault ec20sSyncSourceChangeAlarm ec20sEnteringHoldoverModeAlarm ec20sPowerFault
ec20sOptionIrig ec20sOptionStanag ec20sOption2MHz
ec20sOutputPPSFault ec20sOutput10MHzFault
99. HOLDOVER MODE TRANSITIONS
0: the EC20S exits the ‘Holdover’ mode.
1: the EC20S enters the ‘Holdover’ mode.
Obsolete
Obsolete
Obsolete
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15. COMMAND LINE INTERFACE (CLI)
EPSILON CLOCK MODEL EC20S
Some commands are available using a Command Line Interface accessible by the connector
‘ALARMS’
of the rear panel.
Open a RS232 serial session with the following settings:
-
Speed : 9600
-
Parity : None
-
Data size : 8 bits
-
Stop bit : 1
Type ‘Return’ and the following menu is displayed:
15.1 NETWORK SETTINGS
NOTA: Network addresses and network masks shall be input using the format: xxx.yyy.zzz.www (xxx: decimal value in range [0,255] ; yyy: decimal value in range [0,255] ; zzz: decimal value in range [0,255] ; www: decimal value in range [0,255]).
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Menu description:
1 – Use of DHCP
DHCP service can be disabled (n = No) or enabled (y = Yes).
2 – Static IP address
To set the static IP address of the EC20S.
3 – Sub-network mask
To set the sub-network mask of the EC20S.
4 – Sub-network address
To set the sub-network address of the EC20S.
5 – Broadcast address
To set the broadcast address of the EC20S.
6 – Default gateway address
To set the broadcast address of the EC20S.
9 – Default network setup
To reset the network settings to the default settings:
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NOTA: To validate the network settings, the EC20S shall be restarted using the menu:
0 – Reboot system
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15.2 SNMP SETTINGS
EPSILON CLOCK MODEL EC20S
NOTA: Network addresses and network masks shall be input using the format: xxx.yyy.zzz.www (xxx: decimal value in range [0,255] ; yyy: decimal value in range [0,255] ; zzz: decimal value in range [0,255] ; www: decimal value in range [0,255]).
Menu description:
7 – Trap destination address (1)
First IP address where the SNMP traps shall be transmitted.
8 – Trap destination address (2)
Second IP address where the SNMP traps shall be transmitted.
15.3 EC20S RESTART
The EC20S can be restarted using the menu:
0 – Reboot system
16. LEAP SECOND APPLICATION
The EC20S can apply a leap second to its UTC timescale as follows:
-
In ‘Operator’ mode. The operator defines the leap second direction and the application date
using the web interface (cf. 61 and 62).
-
In ‘Automatic’ mode. The EC20S gets the leap second direction and the application date from the GNSS receiver.
Once a leap second is defined (in ‘Operator’ mode or in ‘Automatic’ mode), the NTP server updates its
In case of a positive leap second, at the time the leap second shall be applied, the time distributed by the Time Of Day messages on the ‘NMEA’ output has the following sequence:
… 23:59:58 …
… 23:59:59 …
… 23:59:60 …
… 00:00:00 …
… 00:00:01 …
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In case of a negative leap second, at the time the leap second shall be applied, the time distributed by the Time Of Day messages on the ‘NMEA’ output has the following sequence:
… 23:59:57 …
… 23:59:58 …
… 00:00:00 …
… 00:00:01 …
17. TECHNICAL FEATURES
The following technical features are minimum performance values. Enhanced performance options are available.
17.1 PHASE LOCK-IN AT POWER-UP
17.1.1 WARMING-UP
- Warm-up time for the local oscillator before tracking search : 5 minutes
- A subsequent fast tracking search brings the oscillator frequency close to the reference input signal frequency
17.1.2 LOCK-IN TIME WITH GNSS SIGNAL
- Output wander compatible with EN 300 462-4-1 (4.1) fig. 1 within 600 seconds after the ‘Warming-
up’ step
- Optimum stabilization after 2 hours
- Total locking time after power-up : < 30 minutes if it is not the first power-up
17.1.3 PHASE NOISE
- Typical, static conditions:
Frequency
10Hz
OXCO
-120dBc/Hz
Rubidium oscillator
-110dBc/Hz
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100Hz
1kHz
10kHz
100kHz
-135dBc/Hz
-145dBc/Hz
-150dBc/Hz
-150dBc/Hz
EPSILON CLOCK MODEL EC20S
-130dBc/Hz
-140dBc/Hz
-145dBc/Hz
-145dBc/Hz
17.1.4 HOLDOVER MODE
If all the enabled synchronization sources are unavailable, the EC20S transits into the ‘Holdover’ mode in which it maintains the generation of the Time of Day messages and the synchronization output signals
(1PPS, 10MHz).
- According to EN 300462 – 4 – 1 (§9.2) (Transmission and Multiplexing (TM) - Generic requirements for synchronization networks).
- Stability
With an OCXO
With a Rubidium oscillator
: < ± 2x10
: < ± 5x10
-10
-11
/day
/day
17.1.5 SHORT TERM STABILITY (ALLAN VARIANCE)
Time interval
1 second
10 seconds
100 seconds
OXCO
1x10
-11
3x10
-11
3x10
-11
17.2 TEMPERATURE STABILITY
- With an OCXO
Peak to peak, from 0 to 60°C : 1x10
-9
89
Rubidium oscillator
3x10
-11
1x10
-11
3x10
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- With a Rubidium Oscillator
Peak to peak, from 0 to 50°C : 1x10
-10
17.3 ELECTROMAGNETIC COMPATIBILITY
Spectracom Corporation
Complies with the requirements of the standards:
- EN 300386 V1.3.1 ed 2001:
Electromagnetic compatibility and radio spectrum matters (ERM) – telecommunication network equipment - electromagnetic compatibility (EMC) requirements.
- EN 61000-6-1: ed 2001:
Generic standards - Immunity for residential, commercial and light-industrial environments.
- EN 55022 ed 1998+ A2 ed 2003 Class A:
Information technology equipment. Radio disturbance characteristics. Limits and methods of measurement.
17.4 SAFETY
- EN 60950-1 : 04/2006 / A11 : 2009 / A1 : 2010 / A12 : 2011 CEI 60950-1 : 2005 / A1 : 2009 - Safety of Information Technology Equipment.
18. MAINTENANCE
18.1 PERIODIC VERIFICATION AND CALIBRATION
The EC20S operates and calibrates itself fully automatically. It does not require maintenance for a period of 10 years.
18.2 UPDATING THE SOFTWARE VERSION
See corresponding web pages to perform EC20S upgrades.
18.3 SPARE PARTS
Fuses 5x20 1A D1TD/HA20
7030.3320
DC connector kit
(female plug).
: Manufacturer CEHESS/SHURTER, manufacturer part number
: Manufacturer NEUTRIK, manufacturer part number NC3FXY
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18.4 TROUBLESHOOTING
EPSILON CLOCK MODEL EC20S
Some EC20S faults and anomalies can be diagnosed from:
-
the visual signaling provided by the front panel LEDs (see 11.1),
-
the ALARMS signaling provided by the alarm signals (see 11.2),
-
status information available on the web interface (see 11),
-
the events log available on the “Events Logging” web page (see 13.10),
-
status information available from the SNMP interface (see 14).
18.5 CUSTOMER SUPPORT INFORMATION
In case of failures, 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.spectracomcorp.com
, For France: www.spectracom.fr
) and refer to the “Support” page.
To speed up the diagnosis of EC20S faults, please send us the current EC20S configuration
(see 13.13.3) and the events log (see 13.10.5). Thank you for your cooperation.
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19. APPENDIX
19.1 NMEA CONNECTOR
19.1.1 PIN-OUT
Type of connector: SUB-D9 Female
Spectracom Corporation
The pin-out of the connector is described in the following table:
1 NC
6 NMEA_RS485_A
2 NMEA_OUT
7 NMEA_RS485_B
3 NMEA_IN
8 OTHER_RS485_A
4 GND
9 OTHER_RS485_B
5 GND
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The inputs/outputs of the SUB-D connector are defined in the following table:
NC
Not Connected
GND
NMEA_IN
Ground
Receive line input of the NMEA message.
RS232 compatible level
NMEA_OUT
NMEA_RS485_A
NMEA_RS485_B
Transmit line output of the NMEA message.
RS232 compatible level
Transmit line output of the NMEA message.
RS485 compatible level
OTHER_RS485_A
OTHER_RS485_B
Receive line input of the NMEA message.
RS485 compatible level
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19.1.2 NMEA MESSAGE INPUT
Connector: connector SUB-D9
Input signal characteristic required:
Data and port parameters : ASCII characters, 9600 bauds, 8 bits, 1 stop bit, no parity.
Protocol : <Message> <CR> <LF>
Format : $GPRMC,hhmmss.ss,S,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh o RMC =
Recommended Minimum Specific GNSS/TRANSIT Data o hhmmss.ss =
UTC of emitter position fix. Must be date the last EXT_1PPS o S = o llll.ll = status of the emitter (A = OK, V=warning).
Latitude of emitter, not used by the EPSILON CLOCK MODEL EC20S o a = N or S (North or South) of emitter, not used by the EPSILON CLOCK MODEL EC20S o yyyyy.yy =
Longitude of emitter, not used by the EPSILON CLOCK MODEL EC20S o a = E or W (East or West) of emitter, not used by the EPSILON CLOCK MODEL EC20S o x.x = not used by the EPSILON CLOCK MODEL EC20S o x.x = o ddmmyy = o x.x = o a = o *hh = not used by the EPSILON CLOCK MODEL EC20S
UTC date not used by the EPSILON CLOCK MODEL EC20S not used by the EPSILON CLOCK MODEL EC20S
Checksum
NOTA: When the status sent is V and /or the checksum sent is incorrect, the NMEA message is not used by the EPSILON CLOCK MODEL EC20S.
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19.1.3 NMEA MESSAGE OUTPUT
Data and port parameters:
Protocol:
ASCII, 9600 bps, 8 bits, 1 stop bit, no parity.
<Message> <CR> <LF>
Format: $GPRMC,hhmmss.ss,S,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh o RMC = Recommended Minimum Specific GNSS/TRANSIT Data o hhmmss.ss = UTC of position fix o S = status of the EPSILON CLOCK MODEL EC20S (A = OK, V=warning)
IF the datation source is not valid THEN S=’V’
ELSE (the datation source is valid) THEN
IF the EC20S is in ‘Forced Holdover’ mode (Ref. 65) THEN S=’A’
ELSE (the EC20S is NOT in ‘Forced Holdover’ mode)
IF the EC2OS Status (Ref. 3) is in ‘OK’ or ‘Warning’ state THEN S=’A’
ELSE (the EC2OS Status is in ‘Alarm’ state) S=’V’ o llll.ll =
Latitude of fix o a = N or S (North or South) o yyyyy.yy = Longitude of fix o a =
E or W (East or West) o x.x = o x.x = not used, set to 0 not used, set to 0 o ddmmyy = UTC date o x.x = not used, Set to 0 o a = o *hh =
Set to E
Checksum
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19.2 ALARM & RS232 SERIAL PORT CONNECTOR
Type of Connector: SUB-D9 Female
The pin-out of the connector is described in the following table:
1
RL_URG_C
6
RL_URG_T
2
CTRL OUT
7
RL_URG_R
3
CTRL IN
8
RL_NON-URG_R
4
RL_NON-URG_C
9
RL_NON-URG_T
5
GND
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The inputs/outputs of the SUB-D connector are defined in the following table:
GND
Ground
CTRL IN & OUT
Can be used to connect a Serial Terminal port to manage Network configuration without Network RJ45 port.
Urgent Alarm – Common contact
RL_URG_C
RL_URG_T
Urgent Alarm – Active opened contact
Urgent Alarm – Active closed contact
RL_URG_R
RL_NON-URG_C
RL_NON-URG_T
Non-Urgent Alarm – Common contact
Non-Urgent Alarm – Active opened contact
RL_NON-URG_R
Non-Urgent Alarm – Active closed contact
To get a closed contact when an Urgent Alarm (see 11.2.1) is raised, 1 and 7 pins shall be used.
To get a closed contact when a Non-Urgent Alarm (see 11.2.2) is raised, 4 and 8 pins shall be used.
To get an opened contact when an Urgent Alarm (see 11.2.1) is raised, 1 and 6 pins shall be used.
To get an opened contact when a Non-Urgent Alarm (see 11.2.2) is raised, 4 and 9 pins shall be used.
Additional RS232 Serial port function: Accepts commands to locally configure the IP network parameters for initial connectivity - Character structure: ASCII, 9600 baud, 1 start, 8 data, 1 stop, no parity. Please, use only a dedicated cable with Pin 2,3 and 5 to use this feature independently – separated from Alarm contacts.
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19.3 DC CONNECTOR
Type of Connector : XLR Male
Use a XLR Female connector to supply the product.
1 Positive Pin
2 Negative Pin
3 GROUND
2
3
This DC input is isolated, so a positive or negative power supply can be used.
Positive Case
EPSILON CLOCK MODEL EC20S
Negative Case
1
Pin 1
Pin 2
Pin 3
+24V
0V
GROUND
0V
-48V
GROUND
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REVISION HISTORY
Revision Level
A0
A1
A2
Rev1
Rev2
Rev3
Rev4
Rev 5
Rev 6
Date Description
08/10/08 First Release
09/12/08
Web Page Updated
09/09/09 Mute Mode, Events logging, Configuration Save added
07/01/13 NTP and DC Connector
12/02/14 Multi-GNSS source
25/09/14 Information of the type of embedded oscillator + NTP Stratum
Management
06/03/2015 NTP Stratum values modified
20/03/2015 Mute “Disable” mode has changed
Additional RS232 port description
11/06/2015 Mute modes description –Leap Second management indication
Spectracom Corporation
1565 Jefferson Road
– Suite 460
Rochester, NY 14623 - USA www.spectracomcorp.com
Phone: US +1.585.321.5800
Fax: US +1.585.321.5219
3 Avenue du Canada
91974 Les Ulis, France www.spectracom.fr
Phone: +33(0)1.64.53.39.80
Fax: +33(0)1.64.53.39.81
6A Beechwood Chineham park
Basingstoke Hants
– RG24 8WA - UK www.spectracomcorp.com
Phone: +44 (0)1256 303630
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