epsilon clock model ec31m

EPSILON CLOCK
MODEL EC31M
USER’S MANUAL
95 Methodist Hill Drive
Rochester, NY 14623
Phone: US +1.585.321.5800
Fax: US +1.585.321.5219
3 Avenue du Canada
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 170164-A1
Manual Revision A1
20 October 2008
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 GPS 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.
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
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
Table of Contents
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.7.1
1.7.2
1.8
1.9
1.10
1.10.1
1.10.2
1.10.3
1.11
2
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.3
2.3.1
2.3.2
2.3.3
2.4
2.5
2.6
3
3.1
3.2
3.3
3.3.1
3.3.2
3.4
INTRODUCTION ............................................................................................................. 1-1
Safety Precautions
1-1
Safety during Adjustments, Maintenance, and Repair
1-1
Inventory
1-2
Inspection
1-2
General Description
1-3
Integrated Remote Control Interface
1-4
Front and Rear Panels
1-5
EC31M Front Panel ......................................................................................................... 1-6
EC31M Back Panel.......................................................................................................... 1-7
Dimensions and Weight
1-8
Operating Environment
1-8
Power Supply
1-8
DC Power Supply Input ................................................................................................... 1-8
AC Power Supply Input ................................................................................................... 1-8
Redundancy...................................................................................................................... 1-8
Terminology
1-9
TECHNICAL FEATURES ................................................................................................ 2-1
Timing Reference Generation and Characteristics
2-1
GPS Reception ................................................................................................................. 2-1
1PPS External Synchronization Input.............................................................................. 2-1
Phase Lock-in at Power-up .............................................................................................. 2-2
10MHz output .................................................................................................................. 2-2
1PPS Output..................................................................................................................... 2-3
Auxilliary Connector Signals
2-4
NMEA.............................................................................................................................. 2-4
Event inputs ..................................................................................................................... 2-4
Event output ..................................................................................................................... 2-4
IRIG B Input .................................................................................................................... 2-4
IRIG B Output.................................................................................................................. 2-4
Network Connectivity
2-5
Ethernet Interface............................................................................................................. 2-5
IP Address Assignment.................................................................................................... 2-5
Protocols .......................................................................................................................... 2-5
Control PC for Web Interface
2-5
EMC
2-6
Safety
2-6
PUTTING THE EC31M INTO OPERATION .................................................................. 3-1
Preliminary Connections
3-1
Powering Up
3-1
Network Connection
3-2
Network with DHCP........................................................................................................ 3-2
Network without DHCP................................................................................................... 3-3
Configure the EPSILON CLOCK MODEL EC31M
3-3
User’s Manual
iii
EPSILON CLOCK MODEL EC31M
4
4.1
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
4.2.11
4.2.12
5
5.1
6
6.1
6.2
6.3
6.4
6.4.1
6.4.2
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
iv
Spectracom Corporation
OPERATION .................................................................................................................... 4-1
General Information
4-1
Control of operating functions ......................................................................................... 4-1
Network Configuration .................................................................................................... 4-1
Clock Generation ............................................................................................................. 4-1
Distribution Monitoring................................................................................................... 4-2
GPS Reception ................................................................................................................. 4-2
Equipment Start-up .......................................................................................................... 4-3
Web Pages
4-4
Welcome Page ................................................................................................................. 4-4
Upper task bar and page header ....................................................................................... 4-5
Clock Status page............................................................................................................. 4-6
Password page................................................................................................................ 4-12
Network Setup page ....................................................................................................... 4-13
SNMP Setup page .......................................................................................................... 4-14
Time & Synchronization Setup page ............................................................................. 4-16
GPS Setup page.............................................................................................................. 4-20
Events Logging .............................................................................................................. 4-21
Versions ......................................................................................................................... 4-22
Software Upgrade .......................................................................................................... 4-23
Reboot ............................................................................................................................ 4-24
SNMP CONTROL............................................................................................................. 5-1
SNMP TRAPS
5-1
MAINTENANCE............................................................................................................... 6-1
Periodic Verification and Calibration
6-1
Updating the Software Version
6-1
Spare Parts
6-1
Troubleshooting
6-1
Searching for Alarm Origin ............................................................................................. 6-1
Customer Support Information ........................................................................................ 6-2
APPENDIX....................................................................................................................... 7-1
DC Connector Pin-Out
7-1
Event Output Connector Pin-Out
7-2
Datation Message Output
7-3
NMEA IN Connector Pin-Out
7-4
NMEA Message Input
7-5
NMEA OUT Connector Pin-Out
7-6
NMEA Message Output
7-7
Terminal Control Connectors Pin-Out
7-8
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
1 Introduction
1.1 Safety Precautions
•
Before switching on the unit, ensure that it is compatible with the local mains supply.
(Refer to Setting the EC31M 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.
1.2 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).
The unit must be disconnected from all power sources before carrying out any adjustments,
replacements, maintenance, or repair.
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.
For special hot plugging removal, please follow the instructions Maintenance.
WHENEVER IT IS LIKELY THAT PROTECTION HAS BEEN IMPAIRED, THE APPARATUS
MUST BE SWITCHED OFF, DISCONNECTED, AND SECURED AGAINST ANY
UNINTENDED OPERATION.
User’s Manual
1-1
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
1.3 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 web site, see “Support” page.
CAUTION:
Electronic equipment is sensitive to Electrostatic
Discharge (ESD). Observe all applicable ESD
precautions and safeguards when handling the
Spectracom equipment.
NOTE: If equipment is returned 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 EC31M Base Unit
•
One DC line cord
•
User’s Manual
1.4 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 web site, see “Support” page.
1-2
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
1.5 General Description
The EPSILON CLOCK MODEL EC31M is a GPS Clock, providing the best cost-effective
solution for reliable, and 24-hour-a-day, uninterrupted applications. The EC31M is particularly
well-suited for defence applications as well as network infrastructures requiring high quality,
reliability and availability.
The EPSILON CLOCK MODEL EC31M provides accurate time and frequency synchronisation.
Key parameters are:
•
High performance OCXO or Rubidium oscillator disciplined by GPS through Epsiltime©
smart predictive slaving algorithm
•
High performance holdover stability (2.10-10/day)
•
AC and DC power supply redundancy
•
2 independent Ethernet ports.
•
2 x 1 PPS outputs
•
2 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 management by SNMP/HTTP, through Ethernet port
The quality of the internally generated reference Clock is related to the oscillator performance
and the high performance tracking algorithm:
User’s Manual
1-3
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
1.6 Integrated Remote Control Interface
The EC31M contains an Ethernet IP interface so that it can be fully controlled from a remote
location.
The EC31M includes its own HTTP web server so that a simple navigator is sufficient to
configure and retrieve status from the equipment. Application and system software release is
also possible through this interface.
Moreover, network supervision can be achieved with SNMP protocol, especially traps sent to a
programmable IP address.
1-4
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
1.7 Front and Rear Panels
User’s Manual
1-5
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
1.7.1 EC31M Front Panel
1.7.1.1
Front Panel LEDs
LOCKED
Indicator of power supplies connections.
No exploitable source available or currently used synchronization source not
Yellow
available.
Blinking
EC31M is in tracking mode.
Green
Green
EC31M is locked to a source.
POWER/INIT
Indicates the current status of the reference source.
Red
EC31M is stopped after three attempts to start (Hard or Soft).
Blinking
Red
Green
EC31M is in initialising state.
EC31M is running.
PPS
Indicates the current status of the distributed 1PPS and 10MHz.
Red
At least one of the PPS signals not present on outputs ( output may be shorted ).
GREEN
Both PPS signals present on outputs.
On normal operation, all LEDs should be green. Only available reference input sources
should be enabled.
1.7.1.2
Front Panel Connectors
NMEA - TIME message input
SUBD-9 RS232 for Time message input.
1PPS External input
BNC
External input for a 1PPS reference.
IRIG B input
BNC
External input for an IRIG B reference.
1-6
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
1.7.2 EC31M Back Panel
AC POWER
Schaffner AC power entry with integrated fuse.
DC POWER
POWER
DC power supply input.
SUB-D
10MHz (2)
BNC
Distributed sinus frequency outputs.
1PPS (2)
BNC
Distributed One Pulse Per Second outputs.
IRIG B
BNC
IRIG B002 Output.
Ethernet 10/100 BaseT (NTP-SZ and NTP-NSZ)
RJ45
Network connectivity.
Terminal Console (TC-SZ and TC-NSZ)
RJ45
RS232 for Terminal control.
GPS Antenna
TNC
Antenna inputs for GPS receiver and remote active antenna 5VDC supply.
NMEA - TIME message Output
SUBD-9 RS232 for Time message output.
Dating Inputs (Ev-1 to EV-4)
BNC
Inputs for the Datation module.
Dating Output (EV-OUT)
SUBD-9 RS232 for Datation message output.
GROUND
Casing grounding.
User’s Manual
1-7
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
1.8 Dimensions and Weight
Width:
19" (483 mm)
Height:
2 U (88 mm).
Depth:
385 mm.
Weight:
<4.7 kg.
Compatibility:
19” rack
The EC31M 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.
Environment
1.9 Operating Envir
onment
-
-
Operating temperature:
With OCXO:
-5 to 60°C
With Rubidium:
-5 to 50°C
Storage temperature:
-40 to 85°C
Relative humidity: 95 % non-condensing
1.10 Power Supply
1.10.1 DC Power Supply Input
-
Nominal DC input voltage conditions:
Maximum Total Power consumption:
18 to 36 Volts DC (Option 36 to 72 Volts DC)
< 60 W
-
Protection against polarity reversal
DC input wires are not ground referenced
Protected by a PolySwitch fuse (automatically rearmed)
1.10.2 AC Power Supply Input
-
Nominal AC input voltage: 90 to 264 Volts AC / 48 to 63 Hz
On switch: 2 fuses: D1TD 2A 5x20
1.10.3 Redundancy
Power supply redundancy: between AC and DC converters.
If the AC Input power supply is present, DC input is internally disconnected. If AC input fails, DC
input switches over to supply the equipment.
1-8
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
1.11 Terminology
DHCP
GPS
OCXO
Rb
S/A
SFN
TRAIM
UTC
1PPS
1 PPS driver
Holdover
Reliability
Frequency driver
Reference input
IERS
MAC
MIB
NTP
IP
SNMP
NMEA
IRIG
User’s Manual
Dynamic Host Configuration Protocol.
Global Positioning System.
Oven Controlled XTAL (Crystal) Oscillator.
Rubidium oscillator.
Selective Availability.
Single Frequency Network.
Time Receiver Autonomous Integrity Monitoring.
Universal Time Coordinated.
One Pulse Per Second.
Pulse signal obtained through division of the frequency driver
If the reference input signal is lost, the EPSILON CLOCK® maintains the
generation of information and of time and frequency signals.
Concerns the positioning mode of the antenna. In automatic mode, the
EPSILON CLOCK® calculates the position of the antenna and, after
testing the result, imposes the reliable position on the internal GPS
receiver. The receiver therefore functions in GPS 0D reception mode. The
EPSILON CLOCK® is synchronized by following at least one satellite.
Frequency signal generated by the built-in oscillator.
Time and frequency source used by the EPSILON CLOCK®.
International Earth Rotation Service.
Medium Access Control.
Management Information Base.
Network Time Protocol.
Internet Protocol.
Simple Network Management Protocol.
National marine Electronics Association.
Inter Range Instrumentation Group.
1-9
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
2 Technical Features
2.1 Timing Reference Generation and Characteristics
The following characteristics are minimum values. Enhanced performance options are available.
2.1.1 GPS Reception
-
Connector:
2 x L1 GPS C/A code
Power supply to active antenna:
Fold Back protection:
Antenna female 50 Ω (type TNC)
5V/80 mA max
The power supply is cut in the event of a shortcircuit in the antenna input
2.1.2 1PPS External Synchronization Input
-
TTL level
Input impedance: 50Ω
50Ω BNC connector
Active rise edge (high level duration 100µs minimum)
Minimal Accuracy to UTC: ±50ns (1σ)
CAUTION:
User’s Manual
If the External Synchronization Input do not have the
required minimum characteristics, the global performance
of the EPSILON CLOCK MODEL EC31M will decrease
dramatically.
2-1
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
2.1.3 Phase Lock-in at Power-up
2.1.3.1
-
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
2.1.3.2
-
Lock-in Time with GPS signal
Output wander compatible with EN 300 462-4-1 (4.1) fig. 1 in:
600 s max after warming-up
Optimum stabilization after 2 hours
Total locking time after power-up: < 30 minutes if not a first time power-up
-
2.1.4 10MHz output
-
Number of outputs:
Port type:
Level:
Type:
2.1.4.1
2
50Ω BNC coaxial.
12±2dBm, with a 50Ω load.
Sinewave signal, -35dBc harmonic distortion.
Phase Noise
Typical, static conditions:
With OCXO:
10Hz
100Hz
1kHz
10kHz
100kHz
-120dBc/Hz
-135dBc/Hz
-145dBc/Hz
-150dBc/Hz
-150dBc/Hz
With Rubidium oscillator:
10Hz
100Hz
1kHz
10kHz
100kHz
2.1.4.2
-
2-2
-110dBc/Hz
-130dBc/Hz
-140dBc/Hz
-155dBc/Hz
-155dBc/Hz
Holdover Mode
According to §9 EN 300 462-4-1 (9.2) (Transmission and Multiplexing ™ - Generic
requirements for synchronization networks).
Stability < ± 2x10-10/day with OCXO.
< ± 5x10-11/day with Rubidium oscillator.
User’s Manual
Spectracom Corporation
2.1.4.3
EPSILON CLOCK MODEL EC31M
Short Term Stability (Allan Variance)
With OCXO:
- 1s: 1x10-11
- 10s: 3x10-11
- 100s: 3x10-11
With Rubidium oscillator:
- 1s: 3x10-11
- 10s: 1x10-11
- 100s: 3x10-12
2.1.4.4
-
Temperature Stability
With OCXO:
Peak to peak, from 0 to 60°C:
With Rubidium Oscillator:
Peak to peak, from 0 to 50°C:
1x10 -9
1x10 -10
2.1.5 1PPS Output
-
Number of outputs:
2
Port type:
50Ω BNC coaxial.
Level:
TTL/3.3V, with a 50Ω load.
Pulse Length
300µs.
Accuracy to UTC, GPS locked: ± 25ns (1σ).
Accuracy to UTC instantaneous (phase locked): ±35ns max.
With OCXO:
Holdover (constant temperature, 24 hours GPS locked)
after 4 hours
after 1 day
0.8 µs
10 µs
With Rubidium:
Holdover (constant temperature, 24 hours GPS locked)
after 4 hours
after 1 day
0.3 µs
2 µs
User’s Manual
2-3
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
2.2 Auxilliary Connector Signals
2.2.1 NMEA
RS232 output for Time of Day (TOD) information.
-
NMEA mode:
Port type:
asynchronous RS232C, 9600 bauds, 8 bits, 1 stop bit, no parity.
9-pin female SUB-D
2.2.2 Event inputs
-
Number of inputs: 4
Port type:
BNC coaxial.
Level:
TTL
2.2.3 Event output
RS232 output for events information.
-
Format:
Port type:
asynchronous RS232C, 9600 bauds, 8 bits, 1 stop bit, no parity.
9-pin female SUB-D
2.2.4 IRIG B Input
-
Input: TTL level
50Ω BNC connector
Format: IRIG-B002
2.2.5 IRIG B Output
-
2-4
Output: TTL level
BNC connector
Format: IRIG-B002
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
2.3 Network Connectivity
2.3.1 Ethernet Interface
-
Port type: RJ45 connector
Interface: 10/100 BaseT signal
2.3.2 IP Address Assignment
-
DHCP automatic assignment
Or fixed IP address
2.3.3 Protocols
-
Transfer Control Protocol and Internet Protocol (TCP/IP).
IP address setting:
DHCP protocol.
The EC31M includes a web pages server with HTTP protocol for configuration and status.
Configuration and status parameters are manageable through SNMP protocol. The MIB
includes a sub-set of configuration and status parameters. SNMP traps are sent to the network
on event trigger.
Control
2.4 Con
trol PC for Web Interface
-
OS:
Internet Browser:
User’s Manual
Windows or Linux
Tested with Firefox 1.5 and Microsoft IE6.
2-5
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
2.5 EMC
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 61000-6-2: ed 2005,
EN 61000-6-3: ed 2007:
Generic standards – Immunity for residential, commercial and light-industrial
environments.
EN 55022 ed 2006:
Information technology equipment. Radio disturbance characteristics. Limits and
methods of measurement.
2.6 Safety
-
2-6
EN 60950:
Safety of Information Technology Equipment.
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
3 Putting the EC31M into Operation
The EC31M can be installed in a rack or used as-is.
3.1 Preliminary Connections
Before starting the EPSILON CLOCK MODEL EC31M, perform the following tasks:
•
Leave free space of a few centimeters under the unit, in order to facilitate natural
air flow from bottom to top of the EPSILON CLOCK MODEL EC31M.
•
Connecting cables for signals and power supply should be secured to locks provided for
this purpose.
•
Connect the GPS antenna (refer to GPS Antenna Installation).
•
Connect a ground lead from the earth pin on the EC31M back panel to the frame of the
rack.
Powering
3.2 Powe
ring Up
The EC31M can be powered from an AC source, from a DC source, or from both.
For full redundancy, connect DC power cables to the DC connector and AC power cable to the
AC connector. Checks the polarity of the power signal before connecting it (refer herein and to
back panel labels for the pin-out).
Power-up is immediate when connecting DC power with the cable, while AC power must be
switched on.
•
During power-up, check the initialization sequence process on the LED.
For a standard configuration (GPS reference), after the system initialization sequence, the GPS
receiver locks to the satellites (Locked LED switches from yellow to blinking green), the internal
oscillator warms-up, and the oscillator tracking operation gets locked. The whole process may
take about 15 minutes.
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3.3 Network Connection
Factory setting for the network is dynamic address (DHCP configuration).
Connect the 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 (e.g. 192.168.0.101).
On the PC, open a web browser page at the EC31M IP address. Click to enter the web
interface. Go to "System Setup">"Network Setup" web page. Enter password (factory set at:
"pwd").
If the EC31M is already DHCP configured and if no DHCP server is available, you cannot
connect a control PC to access EC31M network configuration pages. It is then possible to reset
the IP address and mode to the factory setting using the TC interface.
Connect a serial cable from EC31M (TC-SZ and TC-NSZ connectors) to a control PC.
With serial software (like Putty or Hyperterminal), configure serial parameter: 9600-N-81.
Press Enter to show Menu:
3.3.1 Network with DHCP
If your network uses DHCP, you can use the current IP address of product with your
Web-browser.
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3.3.2 Network without DHCP
If your network doesn’t use DHCP, or you want specify an IP address manually, enter
‘1’ on command line.
Enter ‘no’ to disable DHCP configuration Mode.
Enter ‘2’ on command line to modify the IP address:
Enter ‘8’ on command line to Reboot system and apply modification.
3.4 Configure the EPSILON CLOCK MODEL EC31M
The EC31M is configured through an Ethernet network with a web browser.
After boot sequence, open a browser at the EC31M IP address and enter the setup parameters.
Enable GPS or External Synchronization source as a minimum.
During installation, you may check the quality of the GPS reception on the Clock Status web
page. The GPS status tables show the number and quality of received satellites. The minimum
number of received satellites should be four (out of 12).
For a standard configuration, if no external reference is available, disable the External
Synchronization in the "Time and Synchronization Setup" page with priority level setting to
"Disabled".
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4 Operation
General
4.1 Ge
neral Information
4.1.1 Control of operating functions
The EC31M may be controlled through a web interface (Ethernet/RJ45) with a remote PC.
4.1.2 Network Configuration
The IP address of the EC31M can be assigned through DHCP protocol or manually. The
assignment mode is programmable through the web interface and reset with the Terminal
Control interface.
The assignment mode is saved when switching off.
4.1.2.1
DHCP IP Assignment
If DHCP mode is selected, the address is assigned only by a DHCP server on the network.
If there is no DHCP server on the network, the IP address can be reset to the 192.168.0.100
fixed factory setting with the Terminal Control in order to connect a control PC that is set
accordingly.
4.1.2.2
Web Interface IP Assignment
When the unit is connected to a PC, configuration is made in the corresponding "System
Setup>NetworkSetup" web page. If DHCP is chosen, the address is assigned at start-up by a
DHCP server on the network. If no DHCP is chosen, the address is entered manually in the IP
address field.
4.1.3 Clock Generation
4.1.3.1
Reference Sources and Selection
Reference sources for oscillator tracking include 1PPS from the integrated GPS receiver and
External 1PPS reference from BNC input.
Automatic selection of the source is made according to Enable, Source Forcing, Priority
Configuration Parameters, and Reference Source Alarm status.
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4.1.3.2
Spectracom Corporation
Tracking algorithm
The algorithm is a phase/frequency locked loop-type tracking algorithm. The phase
measurement filter uses Kalman computation.
The tracking process involves several states:
•
Warm-up period after power-up during which the oscillator control is stationary.
•
Fast tracking for coarse oscillator control adjustment on tracking algorithm start-up.
•
Accurate tracking with long-time constant filtering when the reference signal is present. The
oscillator is locked on the reference ("Distribution" LED switches to green).
•
Holdover when reference signal is absent (e.g., GPS loss of satellites, during input
switchover). Oscillator control remains steady on the last valid value.
•
Degraded state: Hidden state in which tracking was accurate and lost its reference input.
Before declaring urgent alarm on the EC31M, a delay of a few minutes (factory
programmable) is used to confirm the loss of the reference source and the switch to the
holdover state with alarm triggering.
4.1.4 Distribution Monitoring
All channels are monitored so that a drop of signal at the output is detected and an alarm
(Outputs Frequency and 1PPS) is generated.
4.1.5 GPS Reception
An integrated module takes care of the GPS reception. All related configuration parameters and
reception status are available through the web interface.
The operator may choose among three operating modes:
•
Manual or fixed: The operator sets manually the accurate coordinates for the receiver. The
receiver can then start immediately in an accurate timing reception mode. This mode needs
only one satellite.
•
Automatic: The receiver starts computing its polar coordinates and after 1 hour switches to
the accurate timing mode. The first step requires the reception of 4 satellites to compute the
coordinates.
•
Mobile: The receiver expects the antenna to move permanently and evaluates coordinates
continuously. It is not then able to switch to the most accurate timing mode.
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4.1.6 Equipment Start-up
At start-up, after initialization, the software retrieves the last configuration and starts
programmable hardware. Distributed signals are generated with a degraded performance first
and with required performance after oscillator locking.
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4.2 Web Pages
4.2.1 Welcome Page
Click to enter the web site. The first displayed page is the Clock Status page.
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4.2.2 Upper task bar and page header
This menu bar gives access to the following menus:
•
•
System Setup:
- Network setup:
Network connection parameters (protected by password).
- Traps Setup:
SNMP parameters and traps enable (protected by
password).
- Logout:
Logout from the web site.
Clock Setup:
- Time and Synchronization Setup:
Setting the time and
(protected by password).
- GPS Setup:
synchronization
parameters
GPS reception parameters (protected by password)
•
Clock Status:
- Summary of status and alarms of the EC31M
•
Tools
- Events Logging:
Display of events history.
- Software Version:
Display of current version of software parts.
- Software Upgrade:
Upgrading software
- Reboot:
Per module hardware reset
Header time information is provided by the EC31M. A letter is displayed near the time message,
according to the setting of the display mode and source reception (GPS) availability:
- U:
UTC time reference
- G:
GPS time reference
- L:
UTC time corrected by programmed offset
- N:
No time reference (no GPS information since start-up)
- M:
Manual reference (time has been set manually in "Time
and Reference Setup menu")
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4.2.3 Clock Status page
This page is automatically refreshed every 5 seconds.
The "Alarm" label indicates an urgent alarm during which the distributed signal does not comply
with its specifications for some reason: no signal, tracking not locked, no reference source.
"Warning" means that the detected problem does not affect the distributed signal quality but the
operator should take action to solve the problem.
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Global Status
• EC31M Status:
Global working status of EC31M:
•
- Ok:
All functions run as expected, no alarm in EC31M.
- Warning:
EC31M distributes valid signals referenced to a valid input
(GPS or External), but alarms remain. Maintenance is
required.
- Alarm:
EC31M does not distribute a valid signal (GPS input loss,
any other important failure).
SFN Status:
Indicates when unit is in SFN mode or not:
•
- On:
EC31M is in SFN mode; means that the 10MHz frequency
signal is cycle locked to the 1PPS signal (10 000 000
cycles from the 10 MHz equals 1PPS period) and provides
a frequency accuracy better than 1X10-8 and a phase
accuracy better than 1µs.
- Off:
EC31M is not in SFN mode.
Synchronization Source:
Selected synchronization source for the module:
•
- GPS:
1PPS signal of the GPS receiver.
- External:
External 1PPS signal (BNC rear panel input).
- None:
EC31M in Holdover or Forced Holdover mode.
Oscillator Control voltage:
Control voltage of the internal oscillator (in volts)
Ranges from 0V to 8V.
Generates an Internal Oscillator alarm when the value
reaches 0V or 8V, meaning that the EC31M is no longer
able to drive the Internal Oscillator.
•
Tracking Status:
Slaving algorithm status:
•
Warming up:
The EC31M internal oscillator is warming up.
Tracking search:
The EC31M receiver is searching best slaving conditions.
Locked:
The EC31M receiver has reached the best slaving
conditions.
Holdover:
The slaving has been suspended because of loss of
synchronization conditions.
Forced Holdover:
The slaving has been suspended on user request.
Synchronisation Time:
Time during EC31M is synchronized to a valid source.
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Alarms
GPS Alarms
• GPS Locked:
Performance of the 1PPS signal of the GPS receiver:
•
- OK:
1PPS signal of the GPS receiver can be used as 1PPS
reference signal for slaving operation.
- Alarm:
1PPS signal of the GPS receiver can’t be used as 1PPS
reference signal for slaving operation.
Antenna Status:
State of the connection to the GPS antenna
•
- Unpowered:
GPS antenna is disconnected or incorrectly powered. Use
of an antenna splitter produces this message. No alarm
generated for this reason.
- Powered:
GPS antenna is connected and correctly powered.
- Shorted:
GPS antenna is in short-circuit.
GPS Module Status:
Working state of the GPS receiver:
•
- OK:
The GPS receiver is working well.
- Alarm:
Problem with the GPS receiver. Communication
breakdown with the GPS receiver or 1PPS signal not
delivered by the GPS receiver.
Internals Alarms
Internal Oscillator:
Monitored status of the 10MHz generated by internal
oscillator:
•
- OK:
Frequency driver operational.
- Alarm:
Frequency driver failure.
Internal 1PPS:
Monitored status of internal 1PPS generated from oscillator
frequency:
4-8
- OK:
1PPS driver operational
- Alarm:
1PPS driver failure
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EPSILON CLOCK MODEL EC31M
Synchronization Sources Alarms
•
External 1PPS Locked:
Status of the external 1PPS synchronization source
•
- OK:
Synchronization source is available.
- Alarm:
Synchronization source is not available.
- Disabled:
Synchronization source not allowed by operator (Clock
setup page).
IRIG B Locked:
Status of the external IRIG B synchronization source
•
OK:
Synchronization source is available.
Alarm:
Synchronization source is not available.
Disabled:
Synchronization source not allowed by operator (Clock
setup page).
Synchronization Alarms
Phase Accuracy:
Estimated phase accuracy has crossed the limit (see Clock
setup page) during a holdover sequence:
•
- OK:
Phase limit not exceeded.
- Alarm:
Phase limit exceeded.
Frequency Accuracy:
Estimated frequency accuracy has crossed the limit (see
Clock setup page) during a holdover sequence
- OK:
Frequency limit not exceeded.
- Alarm:
Frequency limit exceeded.
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Distribution Alarms
• 10 MHz Outputs:
Monitoring of the frequency output signals delivered by the
EC31M:
•
- OK:
The signal is delivered at all outputs.
- Alarm:
The signal is not delivered at one of the outputs.
1PPS Outputs:
Monitoring of the 1PPS output signals delivered by the
EC31M
•
- OK:
The signal is delivered at all the outputs.
- Alarm:
The signal is not delivered at one of the outputs.
IRIG B Output:
Monitoring of the IRIG B output signal delivered by the
EC31M
4-10
- OK:
The signal is delivered at the output.
- Alarm:
The signal is not delivered at the output.
- Disabled:
The signal is not delivered at the output. (Clock setup
page)
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EPSILON CLOCK MODEL EC31M
GPS Status
• GPS Longitude:
Current longitude of the GPS antenna.
•
GPS Latitude:
Current latitude of the GPS antenna.
•
GPS Altitude:
Current altitude of the GPS antenna.
•
Self Survey:
Not applicable in ‘Manual’ and ‘Mobile’ modes. In
‘Automatic’ mode, the self survey phase allows the GPS
receiver to average continuously the geographical position
of the GPS antenna for a period of one hour to get a
precise GPS antenna position. The following values are
then possible:
•
- Pending:
The calculation of precise GPS antenna position is not
done.
- In progress:
The calculation of precise GPS antenna position is in
progress.
- Done:
The calculation of precise GPS antenna position is done.
Visible Satellites:
Number of locked GPS channels (out of a maximum of 12)
•
ID / SNR:
Satellite number and SNR (Signal over Noise Ratio) of the
8 best satellites channels tracked by the GPS receiver.
NMEA Status
• NMEA Longitude:
Current longitude of the NMEA input.
•
NMEA Latitude:
Current latitude of the NMEA input.
•
NMEA Altitude:
Current altitude of the NMEA input.
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4.2.4 Password page
A password is necessary to access the setup pages. The default password is “pwd”. It can be
modified in the Network Setup page.
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4.2.5 Network Setup page
This page allows the user to modify the Network connection parameters.
When set in Use DHCP mode, if the EC31M starts without network connection, the IP address
is not set. After the network connection is restored, a 1 or 2 minute delay occurs before the IP
address is assigned.
•
Host name:
Unique name of the EC31M in the network. This
functionality depends on the DNS server type.
•
Use DHCP:
Dynamic Host Configuration Protocol:
- Yes:
The Dynamic Host Configuration Protocol function is
available. In this case, the IP address of the EC31M is
automatically allocated by the network DHCP server
according to the EC31M MAC address. Following fields do
not apply.
- No:
The Dynamic Host Configuration Protocol function isn’t
available. A static IP address is used. In this case, the
operator must fill in the fields that follow.
•
IP Address, Sub-network mask, Sub-network address, Broadcast address, Default
Gateway:
Fields allowing configuration of the network access when
the DHCP is set to No
•
Change password:
Field for password modification. This password is required
when accessing setup pages. (default password : pwd)
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4.2.6 SNMP Setup page
In this page, the operator can enable the SNMP traps generation and program RO and RW
community names. The SNMP traps report an event (alarm or configuration modification) by
sending a trap message to a destination.
•
SNMP RO Community:
SNMP parameter for get request.
•
SNMP RW Community:
SNMP parameter for set request. RO and RW
communities will become effective after a software reboot
of unit (Tools menu).
•
Trap Community Name:
SNMP parameter is sent in trap messages and helps
identify the managed equipment family, public by default.
•
IP Address Traps destination 1:
Primary SNMP manager address where traps are sent.
Clear field to deactivate.
•
IP Address Traps destination 2:
Secondary SNMP manager address where traps are sent.
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•
Global Traps Enable:
- Yes
- No
•
General Hardware Fault:
- Yes:
- No:
•
GPS fault:
- Yes:
- No:
•
External 1PPS Fault:
- Yes:
- No:
•
Internal oscillator Fault:
- Yes:
- No:
•
Internal 1PPS Fault:
- Yes:
- No:
•
Phase Accuracy Fault:
- Yes:
- No:
•
Frequency Accuracy Fault:
- Yes:
- No:
•
No trap generated.
Generates a trap when the EC31M goes on default
(according to "Global Status").
No trap generated.
Generates a trap when the gps receiver fails or unlocks
(according to "GPS Locked").
No trap generated.
Generates a trap when the External 1PPS is lost (while
enabled)
No trap generated.
Generates a trap when the frequency driver goes on alarm
(generally the oscillator goes on default).
no trap generated.
Generates a trap when the 1PPS driver goes on alarm.
No trap generated.
Generates a trap when estimated phase of the output
signal exceeds the phase limit.
No trap generated.
Generates a trap when estimated frequency of the output
signal exceeds the phase limit.
No trap generated.
No trap generated.
Entering Holdover Mode Alarm:
- Yes:
Generates a trap when the product goes in holdover mode.
- No:
•
Traps are sent according to individual enabling.
Synchronization Source Change Alarm:
- Yes:
Generates a trap when the source of synchronization
changes.
- No:
•
EPSILON CLOCK MODEL EC31M
No trap generated.
Download MIB:
Link for downloading zipped MIB text file.
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4.2.7 Time & Synchronization Setup page
This page is used for setting time computation and display parameters, synchronization source
parameters, and Distribution parameters.
Time parameters
• Date and Time, Set Manual Time button:
Time manual setting allowed only when the EC31M is in
forced holdover mode or when the EC31M has not yet
been synchronized on a GPS reference source.
•
Manual Time Adjust:
Adjust the time by 1 second when the EC31M is in forced
holdover mode or when the EC31M is not yet synchronized
on a reference source. Helpful for fine adjusting manually
set time.
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•
EPSILON CLOCK MODEL EC31M
Date format:
Selection of display format:
•
- DD/MM/AAAA:
day / month / year
- MM/DD/AAAA:
month / day / year
- DD/AAAA:
day of the year / year
Time reference:
Choice of reference time scale:
- UTC:
Universal time scale
- GPS:
Time given by GPS (almost equivalent to UTC)
- Local:
UTC time corrected by a programmable offset
An information letter is displayed after the time message on the header of the web page (see
Upper Task Bar and Page Header description).
•
Offset for Local Time:
Allows computation of local time from UTC time.
•
Leap Second:
Programs in advance the leap second correction, hence
ensuring it will be applied even in case of GPS loss.
Direction of the application:
•
- 0:
Non leap second pending
- –1:
Positive leap second pending
- +1:
Negative leap second pending
Leap Second Date:
Programs in advance the leap second correction, hence
ensuring it will be applied even in case of GPS loss. Date
of application:
•
- 31/03:
31/03
- 30/06:
30/06
- 30/09:
30/09
- 31/12:
31/12
1PPS phase offset:
Phase shift implemented on 1PPS output, from –500ms to
+500ms, entered in ns.
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Synchronisation parameters
• Force holdover:
Keep the oscillator control voltage at a fixed value even if a
synchronization reference is available:
•
- On:
Force holdover
- Off:
Normal slaving mode
Priority level: GPS:
Programs the priority of the GPS reference source.
•
- Priority 1:
Highest priority
- Priority 2:
Medium priority
- Priority 3:
Lowest priority
- Disable:
Disable the source; this source is not supervised; no
corresponding alarm
Priority level: External 1PPS:
Programs the priority of the External 1PPS reference
source:
•
- Priority 1:
Highest priority
- Priority 2:
Medium priority
- Priority 3:
Lowest priority
- Disable:
Disable the source; this source is not supervised; no
corresponding alarm
Priority level: IRIB B:
Programs the priority of the External IRIG B reference
source.
•
- Priority 1:
Highest priority
- Priority 2:
Medium priority
- Priority 3:
Lowest priority
- Disable:
Disable the source; this source is not supervised; no
corresponding alarm
Force a source as input:
Force the EC31M to be synchronized on a reference source even if other sources
with a highest priority are available, for debug purposes:
- None
- GPS
- External 1PPS
- IRIG B
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•
EPSILON CLOCK MODEL EC31M
External 1PPS requires NMEA:
External source use NMEA input to datecode the 1PPS:
- Yes
- No
•
Alarm Phase Threshold:
Programs the limit value in nanoseconds of the accuracy
after which the 1PPS signal output is deemed invalid.
•
Alarm Frequency Threshold:
Programs the limit value in 10-9 hertz of the accuracy after
which the 10MHz signal output is deemed invalid.
Distribution parameters
• IRIG B Output:
Activate or desactivate the IRIG B Output.
- Enabled
- Disabled
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4.2.8 GPS Setup page
On this page, the operator set the GPS receiver parameters.
•
Antenna Delay:
Time shift compensating the propagation delay of the GPS
signal in the antenna cable (in nanosecond). To be
computed according to type and length of cable.
•
GPS Mode:
Defines the receiver operating mode regarding the position
processing:
•
Automatic:
The GPS receiver averages during 1 hour the antenna
position supplied by the receiver in order to make it
reliable. After this period and providing that a minimum of 4
satellites are detected, the position is set. This 1 hour
position reliability process is initialised every time the board
is switched on and is hold as long as a minimum of 4
satellites is continuously detected. The EC31M must be
fixed.
Manual:
The GPS receiver can provide reference information with
only 3 satellites available. The user is required to precisely
enter the geographic position of the antenna into
corresponding fields.
Mobile:
The GPS receiver computes its position continuously so
that the EC31M (with GPS antenna) can be moved.
Latitude, Longitude, Altitude:
Data defining the geographic position of the GPS antenna
applied in time processing while in manual mode.
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4.2.9 Events Logging
This page displays the recording of events (alarms, warning, information) detected inside the
EC31M.
Alarm and warning refer to status displayed on the Clock Status web page. Information relates
to configuration or state change.
•
"<>" Button:
Navigation through the whole content.
•
"Clear Logs" Button:
Clear the log buffer
•
Module:
Origin of event. EC31M origin relates to general event.
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4.2.10 Versions
This page displays the version number of key elements of EC31M software and firmware.
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4.2.11 Software Upgrade
Software upgrade is performed with this "Upgrade Application" page.
Two steps are necessary: First Upload a New Release from the web client to the EC31M, and
then Activate New Release.
Before starting the upload of a new version, select the file to be downloaded (usually a .tgz file
provided by the manufacturer). Click on the "Upload" button to proceed.
•
Upload File:
First step of upgrade. A tgz compressed file is sent to the
EC31M and stored. Last uploaded release is shown in the
‘New Version’ field.
•
Install New version:
Second step of upgrade. ‘New version’ is the last
downloaded version for upgrade. Current version is the
running version.
When clicking on "Install new version" button, upgrading
module is restarted. Distributed is not impacted.
•
Delete:
This function allows removing uploaded versions.
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4.2.12 Reboot
If the unit malfunction occurs, the operator can order a soft or hard reboot. If the unit is not
reachable, the requested reboot will not be processed.
Select type of reset.
Click on Yes to confirm the reboot.
WARNING: Hard reset stops signals distribution. Take care about your choice.
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5 SNMP Control
5.1 SNMP TRAPS
Traps are generated on events related to alarm and warning activation and deactivation, as well
as configuration modification. The two trap destinations are programmable and traps are
individually enabled in the SNMP Setup web page.
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6 Maintenance
6.1 Periodic Verification and Calibration
The EC31M is fully automatic functioning and self-calibrated. It does not require
maintenance for a period of 10 years.
6.2 Updating the Software Version
See corresponding web pages to perform the upgrade.
6.3 Spare Parts
Fuses 5x20 1A D1TD: Manufacturer CEHESS/SHURTER, manufacturer part number
7040.3120
6.4 Troubleshooting
Symptoms can be diagnosed from front panel LEDs and using information from the web
interface.
6.4.1 Searching for Alarm Origin
6.4.1.1
LED Indicators
Locked alarm:
Shows the validity of the reference source and state of the
tracking algorithm.
1PPS alarm:
6.4.1.2
6.4.1.2.1
Shows the state of outputs.
Web Interface status analysis
Method
The purpose of the method is to determine what object has failed: Input reference
source or hardware failure. Then, in case of hardware failure, the user must determine
if the failure comes from component in the EC31M.
The Web interface status windows give some information on the input reference
sources, on the distributed output signals, on the frequency generation, on the signal
distribution.
6.4.1.2.2
EC31M Status
The EC31M status page can tell if the tracking algorithm is locked and if a signal is
sent to the distribution. Any abnormal detected function leads to the unit replacement.
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Spectracom Corporation
GPS Status
The GPS receiver is an autonomous module connected to the unit.
The GPS should be able to decode at least 4 satellites to be used as a timing
reference. Possible situations could be a low received level on the antenna input, a
disconnected antenna, a shorted antenna, no PPS generation inside the GPS
receiver, and no management link between the unit and the GPS receiver.
After checking the antenna installation, if the receiver is still in a failure status, the unit
should be replaced.
6.4.2 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).
6-2
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
7 Appendix
Pin7.1 DC Connector Pin
-Out
Type of connector:
POWER SUB-D
A1
Pin
A3
A2
A1
Signal
+DC
0V
CASEGND
A2
A3
Description
DC power supply
Power supply return
Case grounding
The above view is the rear panel view as seen by the operator.
User’s Manual
7-1
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
Pin7.2 Event Output Connector Pin
-Out
Type of connector:
SUB-D9 Female
The pin-out of the connector is described in the following table:
1 NC
6 NC
2 TX_EV
7 NC
3 NC
8 NC
4 NC
9 NC
5 GND
The inputs/outputs of the SUB-D connector are defined in the following table:
NC
GND
TX_EV
7-2
Not Connected
Ground
Transmit line output of the Datation Event message.
RS232 compatible level
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
7.3 Datation Message Output
Data and port parameters:
ASCII, 19200 bps, 8 bits, 1 stop bit, no parity.
Protocol:
<Message> <CR> <LF>
For each detected event the equipments send on the dating output the message corresponding
to the following ASCII sentences.
Format:
<F><space><S><space><DD/MM/YY<space><HH><h>MM><m><SS><s><space><MMM><ms><space><UUU><us><space><CCCC><CRLF>
e.g: F 1 24/02/07 12h00m00s 123ms 456us 084d
o space = ASCII space character ( x20 )
o F = Front, R for rising edge and F for falling edge
o S = Event input source number 1, 2, 3 or 4
o DD/MM/YY = Day month year
o HH = Hour
o MM = minutes
o SS = Seconds
o MMM = Milliseconds
o UUU = Microseconds
o CCCC = Checksum (binary sum of all characters) calculated on 16 bits on all characters
send before the checksum, including the <space> located after the <us> string and the
checksum.
CRLF = ASCII carriage return and line feed characters
User’s Manual
7-3
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
Pin7.4 NMEA IN Connector Pin
-Out
Type of connector:
SUB-D9 Female
The pin-out of the connector is described in the following table:
1 NC
6 NC
2 NMEA_IN
7 NC
3 NC
8 NC
4 NC
9 NC
5 GND
The inputs/outputs of the SUB-D connector are defined in the following table:
NC
GND
NMEA_IN
7-4
Not Connected
Ground
Receive line input of the NMEA message.
RS232 compatible level
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
7.5 NMEA Message Input
Connector:
connector SUB-D9
Input signal characteristic required:
Data and port parameters:
ASCII, 9600 bps, 8 bits, 1 stop bit, no parity.
Protocol:
<Message> <CR> <LF>
Format: $GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh
o
o
RMC =
hhmmss.ss =
Recommended Minimum Specific GPS/TRANSIT Data
UTC of emitter position fix. Must be date the last EXT_1PPS
o
o
o
o
o
o
o
o
o
o
o
A=
status of the emitter (A = OK, V=warning).
llll.ll =
Latitude of emitter, not used by the EPSILON CLOCK MODEL EC31M
a = N or S (North or South) of emitter, not used by the EPSILON CLOCK MODEL EC31M
yyyyy.yy =
Longitude of emitter, not used by the EPSILON CLOCK MODEL EC31M
a = E or W (East or West) of emitter, not used by the EPSILON CLOCK MODEL EC31M
x.x =
not used by the EPSILON CLOCK MODEL EC31M
x.x =
not used by the EPSILON CLOCK MODEL EC31M
ddmmyy =
UTC date
x.x =
not used by the EPSILON CLOCK MODEL EC31M
a=
not used by the EPSILON CLOCK MODEL EC31M
*hh =
Checksum
NOTE: When the status sent is V and /or the checksum sent is incorrect, the NMEA message
is not used by the EPSILON CLOCK MODEL EC31M.
User’s Manual
7-5
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
Pin7.6 NMEA OUT Connector Pin
-Out
Type of connector:
SUB-D9 Female
The pin-out of the connector is described in the following table:
1 NC
6 NC
2 NMEA_OUT
7 NC
3 NC
8 NC
4 NC
9 NC
5 GND
The inputs/outputs of the SUB-D connector are defined in the following table:
NC
GND
NMEA_OUT
7-6
Not Connected
Ground
Transmit line output of the NMEA message.
RS232 compatible level
User’s Manual
Spectracom Corporation
EPSILON CLOCK MODEL EC31M
7.7 NMEA Message Output
Data and port parameters:
ASCII, 9600 bps, 8 bits, 1 stop bit, no parity.
Protocol:
<Message> <CR> <LF>
Format: $GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh
o
o
RMC = Recommended Minimum Specific GPS/TRANSIT Data
hhmmss.ss = UTC of position fix
o
o
o
o
o
o
o
o
o
o
o
A = status of the EPSILON CLOCK MODEL EC31M (A = OK, V=warning)
llll.ll =
Latitude of fix
a = N or S (North or South)
yyyyy.yy = Longitude of fix
a=
E or W (East or West)
x.x =
not used, set to 0
x.x =
not used, set to 0
ddmmyy = UTC date
x.x =
not used, Set to 0
a=
Set to E
*hh =
Checksum
User’s Manual
7-7
EPSILON CLOCK MODEL EC31M
Spectracom Corporation
Connectorss Pin
Pin7.8 Terminal Control Connector
-Out
Type of connector:
SUB-D9 Female
The pin-out of the connector is described in the following table:
1 NC
6 NC
2 TX_TC
7 NC
3 RX_TC
8 NC
4 NC
9 NC
5 GND
The inputs/outputs of the SUB-D connector are defined in the following table:
NC
GND
TX_TC
RX_TC
7-8
Not Connected
Ground
Transmit line output of the terminal console.
RS232 compatible level
Receive line input of the terminal console.
RS232 compatible level
User’s Manual
REVISION HISTORY
Revision
Level
ECN
Number
Description
A0
30/09/08
A1
20/10/08
First Release
Update of Pictures
Spectracom Corporation
95 Methodist Hill Drive
Rochester, NY 14623
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

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