EPSILON CLOCK MODEL EC3S
Contents
1. 1 second or 1 second The V key allows the user to validate the capture The key allows the user to go back to the CORRECTIONS menu 6 14 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 5 9 Second Leap Menu This function allows the user to program a positive or negative leap second when the time reference is UTC Leap second Positive Negative No Day of year 001 Year 1992 Active keys lt gt T 4 C V and keypad The C key selects the application way of the leap second The keypad allows the capture of the date The V key allows the user to validate the capture The T key allows the user to go back to the SETUP menu 6 5 10 Menu Reset This allows the user to reset the clock Do you want to reset the clock now Yes No Active keys C and V EPSILON CLOCK User s Manual 6 15 EPSILON CLOCK MODEL EC3S 7 16 Spectracom Corporation EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 7 Remote Control Interface 7 1 General The remote control interface allows remote configuration and remote status reporting of the clock The RS232C connection operates at 9600 bps and is set to 8 bits 1 stop bit and odd parity 7 2 Protocol The protocol used is Master Host Slave EPSILON CLOCK with a systematic reply to all messages The following exceptions apply for which no reply is expected e The time code message sent periodically e The2. 6 3 1 Connecting Menus The connecting menus are access menus To select one of these menus use the keys The key J validates the choice The key 7 allows the user to go back to the previous menu 6 3 2 Consulting Menus These menus may have many pages You may use the scrolling mode page per page with the lt gt keys The key T allows the user to go back to the previous menu There is no circle cycle at the end of it 6 3 3 Capture Menus The user indicates a functioning parameter of the clock digital length or other proposed option The digital values are captured with the 0 to 9 keys The choice is done with the C key to select the character around the chosen option 6 3 4 Capture confirmation The capture is validated by using the V key if there were some modifications The user receives the following indications OK The capture is successful ERR The capture is not successful REM The Ulis inactive The clock runs in remote control mode REMOTE To exit the menu press the key offered 6 6 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 3 5 Menus Organization TEKELEC TEMEX Time message Time reference Leap Second Output Frequencies 6 4 Status Menu This allows access to the states consultation menu of the clock STATUS Global GPS Active keys lt gt J To select the menu use the keys lt gt The J key al
3. Alarms Menu 6 5 5 1pps delay Menu 6 5 6 Mode Menu 6 5 7 Date Menu 6 5 8 Corrections Menu 6 5 9 Second Leap Menu 6 5 10 Menu Reset 7 REMOTE CONTROL INTERFACE 7 1 General 7 2 Protocol 7 3 Time distribution on the remote control interface 7 4 Command and Request List 8 MAINTENANCE she set oie led hos aan tan Spectracom Corporation 6 6 6 6 6 6 6 7 6 7 6 8 6 8 6 9 6 9 6 10 6 11 6 11 6 12 6 12 6 13 6 13 6 13 6 15 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S Introduction The EPSILON CLOCK family of products provides solutions to a wide variety of users for applications involving time frequency and synchronization The Model EC3S clock is highly accurate stable frequency sources operating from GPS input The relative accuracy of clock frequency is 1 10 12 in relation to the international frequency definition Time setting is accurate to less than 100 ns in relation to UTC GPS time The initial configuration may be changed by the user through the local user interface or through the remote control interface described herein The clock has autonomous control of GPS system integrity features TRAIM and rejects defective satellites The time reference thus obtained is processed by efficient algorithms that control the built in oscillator which generates inner frequency and time signals The clock continues to distribute time and frequency signals even if the GPS input signal i
4. OCXO Accuracy lt 100 ns 10 lt 100 ns 10 Holdover Mode after 1 day lt 2us lt 7 us 1 Average over 24 hours when GPS locked after 3 months of continuous operation 2 Without GPS constant temperature after 3 months of continuous operation EPSILON CLOCK User s Manual 3 1 EPSILON CLOCK MODEL EC3S 3 2 Spectracom Corporation EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 4 Features 4 1 Frequency Output Connectors J6 J7 J8 J9 BNC Female Pin settings Core Sine wave signal Frequency 10 MHz Level gt 10 dBm load 50 Q typical 13 dBm Ground Electrical ground of the clock 4 2 IPPS Output Connector J5 BNC Female Pin settings Core Periodic pulse Period 1s Active edge Rising Pulse duration 100us 10us High level gt 2 4 V load 50Q Low level lt 0 8 V load 50Q Rising edge duration lt 20 ns load 50Q Ground Electrical and mechanical ground of the clock EPSILON CLOCK User s Manual 4 1 EPSILON CLOCK MODEL EC3S Spectracom Corporation 4 3 Remote Control Interface RS232C Serial port parameters 9600 bps 8 bits 1 stop bit odd parity Protocol syntax format of messages Refer to the remote control interface Data Binary two s complement Order of bytes emitted Most significant bytes first Connector J4 Mini Din 8 pins female Pin settings I 5 Setting Reserved Reserved Me
5. followed Sat SNR 050 042 045 046 049 045 040 042 Reception level for each satellite Active keys lt gt 7 To select the menu use the keys lt gt The T key allows the user to go back to the upper menu 6 8 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 4 3 Menu This menu gives information about the based configuration of the clock Software version 07 01 Series 3 Software Version Input opt GPS Output option STANAG gt Synchronization on GPS Output option lt Frequencies 5MHz Given Frequencies DC input 24V External DC power supply Pilot Rubidium high perf Kind of frequency pilot Alarm output Hardware or Software gt Alarm in case of Hardware or Software default Active keys lt gt To select the menu use the keys lt gt The T key allows the user to go back to the upper menu 6 5 Setup Menu This menu allows the user to access sub menu to configure the clock SETUP GPS Time reference TOD Alarms lt Option 1pps delay Mode Date lt Correction Leap second Reset Active keys lt gt 7 J To select the menu use the keys lt gt The J key allows the user to select the under menu The T key allows the user to go back to the upper menu For each menu the default configuration is the one written in different characters in the following chapter The Option menu may be selected if the G704 option is
6. in the clock EPSILON CLOCK User s Manual 6 9 EPSILON CLOCK MODEL EC3S Spectracom Corporation 6 5 1 GPS Menu This menu may be chosen if the SLAVED mode is selected This allows the user to set up the GPS receiver mode GPS receiver setup Tracking Position Date Select the sub menu with the keys gt lt et J Tracking Tracking mode Auto Fix Mobile GPS tracking mode Automatic Manual or Mobile Select the tracking mode Automatic Manual or mobile with the keys C and V to confirm the choices Position Lat 4841 33 827 N Hot 00196 00m Setup of the GPS Antenna Position Lon 00242 58 984 E The digital keys are used to set this with the key C and the keys lt and The position setup is necessary only in Fix mode Date Date 10 24 1997 mm dd yyyy Date amp time setup Time 12 33 46 hh mm ss The digital keys are used to set this with the key C and the keys lt and The date setup is necessary only in Fix mode 6 10 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 5 2 Time reference Menu This menu may be chosen if the SLAVED mode is selected This allows the user to select the time reference Time reference GPS UTC nu UTC Local time offset from UTC 00h00mn The offset time is active if the UTC reference is selected This function allows the user to select local time Active keys gt 7 C keypad and V
7. one satellite Frequency signal generated by the built in oscillator Time and frequency source used by the EPSILON CLOCK International Earth Rotation Service EPSILON CLOCK User s Manual 1 3 EPSILON CLOCK MODEL EC3S Spectracom Corporation 1 4 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 1 6 Front and Rear Panel LOCKED POWER pps Q O O er Q sPecrracom x s CLOCK es C LT gt Frs SR C Le li fa E FA FX CL D CE D 1 7 amp ANTENNA Ce ALARM D a c CT T T T T T 2 T TT T T T TT T T T tT T TT EPSILON CLOCK User s Manual 1 5 EPSILON CLOCK MODEL EC3S Spectracom Corporation 1 6 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 2 Installation 2 1 Preliminary Connections Before starting the EPSILON CLOCK perform the following tasks e Position the machine so that the upper and lower air vents are not obstructed e Position the GPS antenna outs
8. set to 0 or loss of synchronization and limit exceeded or synchronization period too short to provide the programmed frequency limit Programmed frequency or limit not exceeded the clock is synchronized during a period of time sufficient enough to provide the frequency inside the programmed limit or the loss of synchronization is not sufficiently long to exceed the programmed limit Optional output board failure Optional output board operational EPSILON cLock hardware failure EPSILON CLOCK hardware operational Antenna not connected Antenna connected Antenna short circuit alarm No antenna short circuit Reseved OO OE EPSILON CLOCK User s Manual 7 21 EPSILON CLOCK MODEL EC3S Spectracom Corporation fad Mall ae Settings Description 4 GPS reception mode OD The clock is synchronized using a single satellite Mode set to manual positioning of the GPS antenna or after reliability testing of the GPS antenna s coordinates in automatic positioning mode Status 37 4 GPS reception mode 2D The clock is synchronized using 3 satellites This mode can only operate if the antenna positioning mode is set to mobile or automatic before reliability testing and only if 3 satellites are tracked 3or7 GPS reception mode 3D The clock is synchronized using 4 to 8 satellites and the antenna positioning mode is set to mobile or automatic before reliability testing 5 to 20 Odd bytes 5 to 19 For each byte the number
9. to the other time references 5 13 Clock reset This command generates the re initialization of the clock EPSILON CLOCK User s Manual 5 3 EPSILON CLOCK MODEL EC3S 5 4 Spectracom Corporation EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 The Local Graphic User Interface 6 1 Functionalities The UI manages the keyboard and the screen of the clock It allows the following choices Sequenced menu Data consulting Data capture Controlling selection to execute Permanent display of some states of the system 6 2 Keyboard The UI keyboard consists of A keypad including the C and keys A set of 5 keys to move the cursor or to validate 6 2 1 Keypad The 0 to 9 keys are reserved for the capture of the digital fields The key C is used to select the data among a multiple choice The key is not used in this application 6 2 2 Function keys The key functions are as follows a Set the cursor on the next capture field or display the next page Set the cursor on the previous capture field or display the previous page Go back to the previous menu The current capture is not confirmed Go to the next menu Confirmed the capture of the current menu EPSILON CLOCK User s Manual 6 5 EPSILON CLOCK MODEL EC3S Spectracom Corporation 6 3 Menus Three kind of menus are provided Connecting menus Consulting menus Capture menus
10. www spectracomcorp com www spectracom fr Spectracom Corporation 6 1 6 2 6 2 1 Table of Contents INTRODUCTION ln ede ae aden eis ad ie ae Inventory Inspection Dimensions and Weight Basic Configuration Terminology Front and Rear Panel INSTALLATION oriei rearen oe eee lek ide oe ee od Preliminary Connections Connections Quality Starting the Clock Turning Off the Clock SPECIFICATIONS nieri ingee nee See ea ee FEATURES annee ge tal ae hae nt et is ce Frequency Output 1PPS Output Remote Control Interface RS232C TOD Output Alarm Mains Power Supply DC Power Supply GPS Antenna Input Operating Environment COMMANDS DESCRIPTION sn inansnnaeen GPS setup GPS position Date setup Time Reference Local hour TOD output setup Display TOD output transmission period Alarms Antenna Delay Correction Functioning mode Leap second Clock reset THE LOCAL GRAPHIC USER INTERFACE Functionalities Keyboard Keypad 6 2 2 Function keys 6 3 6 3 1 Menus Connecting Menus EPSILON CLOCK User s Manual EPSILON CLOCK MODEL EC3S 5 1 5 1 5 1 5 1 5 2 5 2 5 2 5 2 5 2 5 3 5 3 5 3 5 3 6 5 6 5 6 5 6 5 6 6 6 6 EPSILON CLOCK MODEL EC3S 6 3 2 Consulting Menus 6 3 3 Capture Menus 6 3 4 Capture confirmation 6 3 5 Menus Organization 6 4 Status Menu 6 4 1 Global Menu 6 4 2 GPS Menu 6 4 3 Menu 6 5 Setup Menu 6 5 1 GPS Menu 6 5 2 Time reference Menu 6 5 3 TOD Menu 6 5 4
11. CNT 8 DATA MJD integer part hour min sec source The Source byte holds an ASCII character which codes the time reference N No reference U UTC reference G GPS reference L Local time M Manual 7 18 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 7 4 Command and Request List RE EE AE ET HS CO e A SE AT a C Ensstimeemenn 2 es 4 Len dy Coresion 0 J e 4 RE S o G a o C oae o ee The tables that follow contain the format of the commands and the requests EPSILON CLOCK User s Manual 7 19 EPSILON CLOCK MODEL EC3S Spectracom Corporation 7 20 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S a Bytes Settings Description Query Command Status 37 0 bg 1 Clock is synchronized to the reference input GPS bg 0 Clock is not synchronized the clock is in hold over mode after the loss of the reference input signal b to b7 Reserved bits DO a input 1 PPS failure Reference input 1 PPS operational Frequency driver failure Frequency driver operational 1PPS driver failure 1PPS driver operational Failure in at least one standard frequency output All the standard frequency outputs are operational 1PPS output failure 1PPS output operational Phase limit alarm loss of synchronization programmed phase limit exceeded Phase limit not exceeded Frequency or limit alarm loss of synchronization if the programmed limit is
12. EPSILON CLOCK MODEL EC3S 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 4573 D0 Manual Revision DO 20 June 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 li
13. K MODEL EC3S Settings Description Version 67 10 6 b2 1 24V DC input voltage b2 0 48V DC input voltage Lou b3 1 b3 0 STANAG Input No output option Reserved STANAG 4430 Output G 704 Output Pulse rate output IRIG B Output Multiple of 2048 kHz frequency 1 MHz or 2048 kHz according to byte 6 b7 5 MHz or 4096 kHz 10 MHz or 8192 kHz Reserved High performance Rubidium frequency driver Standard performance Rubidium frequency driver High performance OCXO frequency driver Standard performance OCXO frequency driver Relay contact closed on hardware failure phase limit frequency limit Relay contact closed on hardware failure only Set date 68 4 RS PE ie a a ee z O 7 Oooo o Local time Correct antenna cable delay 1 31 Days Reserved o 1 31 Days Sets the GPS receiver date and time 1 8to9 0 1 1 tto12 Monthsy S po to 31992 2016 Years Pt Po 28 hours i G 5 0 59 minutes o 6 0 59 seconds J O o Oe 23 23 hours Difference in hours and minutes between local time and the clock s reference time 59 59 minutes 0 1 000 ns Programmed difference between the distributed 1PPS signal and the built in reference Leap second Leap second 1 No leap second Use leap second Leap second addition Leap second subtraction 2to3 366 Days Day of the year to be used 0 1 1 2 1 992 2127 Yea
14. LOCK Series 3S is equipped with 1 GPS antenna input 1 main power supply input 90 to 265V 48 to 63 Hz 1 DC power supply input 18 to 32 VDC 4x10 MHz outputs gt 10 dB 50 Q 11PPS output TTL 50 Q 1 time code output RS232C 1 alarm output relay contact 1 remote control interface RS 2320 1 2 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 1 5 Terminology GPS OCXO Rb S A TRAIM UTC 1PPS 1 PPS driver TOD Holdover Autonomy Reliability Frequency driver Reference input IERS Global Positioning System Oven Controlled XTAL Crystal Oscillator Rubidium oscillator Selective Availability Time Receiver Autonomous Integrity Monitoring Universal Time Coordinated One Pulse Per Second Pulse signal obtained through division of the frequency driver Time Of Day If the reference input signal is lost the EPSILON CLOCK maintains the generation of information and of time and frequency signals On user request the EPSILON CLOCK maintains the generation of time and frequency signals without using the reference input 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 OD reception mode The EPSILON CLOCK is synchronized by following at least
15. LOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S The two other colored indicators Locked and Power are used to report the status of the clock During start up procedures the colors of these two indicators may be interpreted as follows tected Power Notes Standard hardware Checks the basic features of the automatic test clock Optional hardware ENS Checks optional features test Period of Green Looking for signal emitted by GPS synchronization satellite Synchronization Green Green The distributed time is synchronized to UTC GPS In case of hardware failure or software failure if the corresponding factory setting is active the Alarm output J1 is activated closed relay contact The conditions for activating this output are as follows Faulty GPS receiver Faulty frequency driver Faulty frequency divider loop Faulty distribution of frequency or synchronization signals Faulty frequency or synchronization performances This can be selected via the remote control interface If the failure occurs after the start up sequence both the Locked and Power indicators will be red In this state the Time Of Day message is not distributed Connector J3 and the clock will not be synchronized to the GPS source If this happens contact Spectracom technical support for more information If none of the indicators are lighted the clock is not connected to the power supply Under normal operating c
16. SILON CLOCK User s Manual 7 17 EPSILON CLOCK MODEL EC3S Spectracom Corporation e The contents of sections lt ID gt and lt CNT gt are identical to those sent by the user e The content of the lt DATA gt section o ls identical to that sent by the user if the message was a Command o Contains the information supplied by the clock if the message was a Query The acknowledgement to a Command is an exact copy of the message sent The reply to a Query is the copy of the Query message with the lt DATA gt section completed by the EPSILON CLOCK In a query the lt DATAs field is not taken into account by the EPSILON CLOCK command interpreter An Error message is generated by the clock if one of the following errors occurs e The message contains an unknown ID e The number of bytes in the lt DATA gt section does not correspond to the lt CNT gt value e An overflow is detected in a parameter within the lt DATA gt section 7 3 Time distribution on the remote control interface The time message is transmitted to the remote control interface The format and the output TOD are selected by the display function The transmission is synchronous with the 1pps Format 1 ID 193 CNT 8 DATA day month year hour min sec source Format 2 ID 194 CNT 8 DATA day month year hour min sec source Format 3 ID 195 CNT 8 DATA Day of Year year hour min sec source Format 4 ID 196 CNT 9 DATA MJD source Format 5 ID 197
17. The selection is done with the C key The offset time is selected with the keypad The V key allows the user to validate the capture The T key allows the user to go back to the upper menu 6 5 3 TOD Menu This menu allows the user to set up the time format of the TOD output TOD SETUP Date format Serial line Select the under menu with the keys lt and J Date format Date format Day Month Year Distribution amp display format of the time message Serial line TOD output period The Factory message may be used only by Spectracom in Debug mode TOD output period 000001s Output message TOD Factory message Active keys gt T C keypad and V The selection is done with the C key The TOD output period is selected with the keypad The V key allows the user to validate the capture EPSILON CLOCK User s Manual 6 11 EPSILON CLOCK MODEL EC3S Spectracom Corporation The T key allows the user to go back to the upper menu 6 5 4 Alarms Menu This allows the user to setup activating values of the phase and frequency alarms ALARM SETUP Thresholds Output frequencies Select the under menu with the keys lt and J Thresholds Phase alarm limit 0000001 us Phase alarm threshold Frequency alarm limit 00100e 9 Frequency alarm threshold Phase alarm at 0 let it in active The frequency alarm at 0 let it active just after the GPS reception loss Output frequencies Out freq squelch o
18. V T J and keypad The selection is done with the C key The V key allows the user to validate the capture The T key allows the user to go back to the upper menu 6 5 8 Corrections Menu This menu is optional and may be chosen if the OFF LINE mode is selected Frequency and 1PPS corrections are optional This allows the user to access to the correction sub menu CORRECTIONS Frequency 1PPS second Active keys lt gt 7 J To select the menu use the keys gt EPSILON CLOCK User s Manual 6 13 EPSILON CLOCK MODEL EC3S Spectracom Corporation The J key allows the user to select the under menu The T key allows the user to go back to the SETUP menu Frequency The frequency correction of the pilot The capture corresponds to Af f and is independent from the pilot frequency Frequency correction 00000e 12 Active keys V T and keypad The V key allows the user to validate the capture The T key allows the user to go back to the CORRECTIONS menu 1 PPS Phase correction of the 1pps 1pps correction 000000 0 us Active keys C V T and keypad The selection is done with the C key The V key allows the user to validate the capture The T key allows the user to go back to the CORRECTIONS menu Second Displays the current time and allows the user to correct it 1 second 11 01 1997 10 30 00 UTC second correction 1 sec 1 sec Active keys C V and The C key selects
19. c It requires no field service for a period of 10 years 1 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 EPSILON CLOCK Users Manual 1 1 EPSILON CLOCK MODEL EC3S Spectracom Corporation 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 lf equipment is returned to Spectracom it must be shipped in its original packing material Save all packaging material for this purpose 1 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 web site see Support page 1 3 Dimensions and Weight Height 2U 89mm Width 19 483mm Depth 340mm Weight lt 7kg 1 4 Basic Configuration This document is applicable to the EPSILON CLOCK Model EC3S equipped with OCXO or Rubidium oscillators In its basic configuration the EPSILON C
20. command also allows the user to define which time reference is used The two possibilities are as follows e The Universal Time Coordinated e The GPS Atomic Time The difference between these two time references is equal to a whole number of seconds which changes with every leap second insertion in the UTC reference The GPS Atomic Time reference is recommended when the user s application requires a perfectly continuous time reference In effect the GPS Atomic Time is not subject to leap second insertion EPSILON CLOCK User s Manual 5 1 EPSILON CLOCK MODEL EC3S Spectracom Corporation 5 5 Local hour Using this command the user may shift the hour transmitted by the GPS clock This shift corresponds to a whole number of hours and minutes such as a correction for DST 5 6 TOD output setup This command allows the user to modify the contents of the periodical messages transmitted by the clock on the TOD output In standard mode the default message transmitted contains the current date and hour according to the codes provided herein In diagnostic mode the message transmitted contains information regarding the disciplining of the frequency driver to the GPS reference This mode is used by the manufacturer during the good working verification phases 5 7 Display This command defines the format of the hour transmitted by the TOD message and displayed on the front panel display screen if this option was chosen The five f
21. e correction 50000 50000 10 12 18 85 21 1 0 1 Correction 1s correction 0 Correction 1s Error 2 0 X Invalid message ID ID 64 ee Incorrect number of useful bytes a ie Aa 2 EPSILON CLOCK MODEL EC3S Remote control not active Front panel user interface active Remote control active Front panel user interface not active Settings Frequency correction from 5 to 5 10 8 active function on off line mode Unknown message ID Unauthorized parameter in lt DATA gt section 7 25 EPSILON CLOCK MODEL EC3S Spectracom Corporation 7 26 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S amp Maintenance The EPSILON CLOCK is fully automatic and is not field serviceable It requires no maintenance for a period of 10 years The only potential maintenance operation on the first level is the main power fuse replacement Fuse EPSILON CLOCK User s Manual 8 1 EPSILON CLOCK MODEL EC3S 8 2 Spectracom Corporation EPSILON CLOCK User s Manual REVISION HISTORY Revision ECN Description Level Number 22 06 98 Creation First iteration of this Spectracom documentation converted from 04 08 Temex Sync documentation Suppression of all references to EC3T correction of OCXO ep dais performances 20 06 08 Modification of Front and Rear Panel sheet 1 5 Spectracom Corpora
22. efective 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 fir
23. ff Failure to do may cause damage that voids your Spectracom warranty 2 2 Connections Quality Great care must be taken in setting up the GPS Antenna and its connections Remember that your GPS antenna must have an unobstructed view of the sky The type of cable connecting the antenna to the clock and the length of the cable influence greatly the quality of the signal reception Cable type and length must conform to the rules described herein Connections to the antenna the accessories surge protection in line amplifier and the cable must be weatherproofed An improper installation could result in problems ranging from random intermittent loss of signal to complete loss of GPS reference The most common outcome is the inability to discipline the GPS reference correctly 2 3 Starting the Clock Verify that the preliminary connections have been made If the machine is connected to the main power supply place the ON OFF switch in the 1 position NOTE The ON OFF switch does not act on the DC power supply J2 About 10 seconds after the power is switched on the 1PPS indicator will start flashing once per second This indicates the normal generation of the 1PPS signal by the built in oscillator CAUTION The POWER Led will indicate red until the end of the oscillator warm up time 15 minutes for OCXO 1 hour for Rb For 10 seconds after clock start up the TOD and the Remote Control cannot be used 2 2 EPSILON C
24. ghtning 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 in factory 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 d
25. ide with an unobstructed view of the sky over 360 degrees on top of a mast for example CAUTION The EPSILON CLOCK is designed to be used with the supplied GPS antenna ONLY Using another antenna may cause significant damage to the unit and will void your Spectracom warranty e Connect the antenna cable to the MCX GPS connector of the GPS receiver To ensure the correct reception of the GPS signal the overall system of antenna cable protection requires accurate gain matching Example GPS Signals NS GPS antenna placed in direct view of the sky G1 40 dB 50 m of KX13 cable 30 dB 100 m G2 15 dB EC3S Lightening protection G3 1 dB G1 G2 G3 40 dB 15 dB 1 dB 24 dB Thus Xmin dB lt G1 G2 G3 24 dB lt Xmax dB Xmin and Xmax are defined in last updated revision of application note TF2 e Connect the clock to the main power supply or connect the DC power supply 24V for the 3S to the DC Power connector J2 EPSILON CLOCK User s Manual 2 1 EPSILON CLOCK MODEL EC3S Spectracom Corporation e The main outlet and every associated extension must provide a protective path to earth ground The protection must not be defeated by an extension cord lacking an earth conductor WARNING If the protective conductor s path to ground is broken or defeated the danger of electrical shock to the operator may be present Before disconnecting the unit from the main power supply always switch it o
26. itch Input voltage 90 to 265 V 48 to 63 Hz Fuses 2 x 250 V 1A TD Time Delay Consumption OCXO type oscillator lt 25 W typical Rb type oscillator lt 60 W typical 4 7 DC Power Supply Input power VDC Series 3S 18 to 32V Consumption lt 60 W typical Protection against polarity inversion Protection against short circuit polyswitch ensures the isolation of the clock in relation to the DC power supply in the event of a short circuit of the clock s power supply EPSILON CLOCK User s Manual 4 3 EPSILON CLOCK MODEL EC3S Spectracom Corporation Connector J2 Min Din 7 pins Female Pin settings vu 5 Setting VDC VDC VDC VDC Electrical Ground Electrical Ground Electrical Ground D sa 4 8 GPS Antenna Input Connector Antenna TNC Female 50Q Core GPS Signal Input L1 Output power supply of the active antenna 5V Voltage Current 75 mA max Fold Back protection The power supply is cut in the event of a short circuit in the antenna input Ground Electrical and mechanical ground of the clock 4 9 Operating Environment Operating temperature 0 to 50 Storage temperature 40 to 85 Relative humidity 90 without condensation EMC In accordance with EN50081 and EN50082 4 4 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 5 Commands Description 5 1 GPS setup This command defines the clock functioning mode with regards to the GPS sig
27. lows the user to select the under menu The T key allows the user to go back to the upper menu EPSILON CLOCK User s Manual 6 7 EPSILON CLOCK MODEL EC3S Spectracom Corporation 6 4 1 Global Menu This menu gives global information about the functioning of the clock The sub menus are the following Reference input GPS of the material of the synchronization and of the internal frequency state Reference input OK Hardware OK Synchronization OK Internal Freq OK lt Internal 1pps OK Output 1pps OK Internal 1pps frequency outputs and option Output freq OK Option output OK gt output state lt Phase alarm OK Display of the phase alarms and frequency alarm Frequency alarm OK gt lt Clock control Local Functioning mode of the UI Local keyboard Remote Remote control Active keys lt gt 7 To select the menu use the keys lt gt The T key allows the user to go back to the upper menu 6 4 2 GPS Menu This menu gives information about the GPS reception The sub menus are the following Receiver status OK Mode 3D GPS receiver status of the clock Antenna connected gt lt Lat 4841 33 827 N Hgt 00196 00m Calculated Position by the GPS antenna Lon 00242 58 984 E gt lt Position hold No Reliability state of the position hold Sigma 00050 ns Estimated error on the GPS 1 PPS precision lt Sat Id 03 12 23 31 04 19 31 45 N of the GPS satellites
28. n alarm Yes No The user may cut off the frequency outputs in case of alarms squelch Active keys gt 7 C keypad and V The selection is done with the C key The alarm threshold is selected with the keypad The V key allows the user to validate the capture The T key allows the user to go back to the upper menu 6 5 5 1pps delay Menu This menu may be chosen if the SLAVED mode is selected The 1PPS delay is the delay due to the GPS antenna cable 1PPS delay 000000 ns Active keys lt lt gt 7 C keypad and V The delay is selected with the keypad The V key allows the user to validate the capture The T key allows the user to go back to the upper menu 6 12 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 6 5 6 Mode Menu The user may select the functioning mode of the clock slaved on GPS or off line non slaved Slaving on GPS input yes no Active keys C V and T If the Yes is selected with the C key and followed by the V key the slaving on GPS is validated If the No is selected and followed by the V key the slaving is in off line mode The T key allows the user to go back to the upper menu 6 5 7 Date Menu This menu may be chosen if the OFF LINE mode is selected This allows the manual time setup of the clock The time capture format is the same as the time given Date 11 09 1997 dd mm yyyy Time 16 23 00 Active keys lt gt C
29. nals received Three modes are available Automatic Manual or Mobile The Automatic mode is the default mode during the clock initialization In this mode the clock averages during 24 hours the antenna position supplied by the receiver in order to make it reliable After this period and providing that a minimum of 4 satellites were received at all times the position is fixed and the clock requires only one satellite for time transfer This 24 hour reliability procedure of the position is initialized every time the clock is switched on and is maintained as long as a minimum of 4 satellites are not received continuously The manual mode allows the user to instantaneously force the GPS receiver to function in one satellite mode The user is required to enter the date and the geographic position of the antenna The Mobile mode is useful when the clock is moved while functioning This command prevents the GPS receiver from switching to the 1 satellite mode It is therefore necessary in this case to receive a minimum of 4 satellites continuously to ensure a good disciplining of the frequency source 5 2 GPS position This command allows the initialization of the antenna position This is necessary in Manual mode 5 3 Date setup This command initializes the date of the clock s GPS receiver This associated with the initialization of position when possible accelerates the tracking procedure of the GPS satellites 5 4 Time Reference This
30. of the satellite being tracked is set on bits bg to bg The locking to satellite indicator is given by bit b7 b7 0 locked Even bytes 6 to 20 SNR 0 to 255 of the followed satellites The even byte Oj gives the SNR of the satellite indicated by the byte O _ e g Og 140 80 HEX 12 decimal O4 120 Satellite 12 is locked and its SNR is 120 0 to 65535 ns the locking of at least two satellites by the clock If only a single satellite is locked this parameter is set to 65535 indicating that an estimation is impossible 23 to 26 324 000 000 324 000 000 Latitude of the GPS antenna ms 27 to 30 648 000 000 648 000 000 Longitude of the GPS antenna ms 180 W 180 E 31 to 34 100 000 1 800 000 Altitude of the GPS antenna cm 1 000 m to 1 800 m Status 37 35 1 GPS receiver failure 0 GPS receiver operational eae 26 Serial port TOD link 65 1 1 0 1 Clock diagnostic output configuration 0 TOD message output Period of TOD 2 4 0 100 000 Period of the emission of the TOD message in seconds message 0 100 000 sec emission 16 Sa 10 ar os ae 21 to 22 0 65535 Estimation of the standard deviation of the GPS 1PPS reference signal This estimation required aS cen Sra a fe 005s f 5 0 255 Update version number 6 Clock settings 1 serie 1 b0 to b1 2 serie 2 1 20r3 Series number 3 serie 3 7 22 EPSILON CLOCK User s Manual Spectracom Corporation oo EPSILON CLOC
31. onditions the EPSILON CLOCK will synchronize to GPS time about 3 minutes after start up When it is synchronized both the Locked indicator will be green and the 1PPS indicator will flash once per second The Power indicator will be red until the Rubidium oscillator has warmed up approximately 1 hour In this state the EPSILON CLOCK continuously provides with UTC GPS reference the following outputs e The 1PPS output J5 and the associated Time Of Day message output J3 e The four frequency outputs J6 to J9 EPSILON CLOCK User s Manual 2 3 EPSILON CLOCK MODEL EC3S Spectracom Corporation The Power led turns red in the following cases Faulty GPS receiver Faulty frequency driver Faulty frequency divider loop Faulty frequency or synchronization outputs or impedances not matched Faulty frequency or synchronization performances This can be selected via the remote control interface 2 4 Turning Off the Clock To turn off the EPSILON CLOCK place the main power switch to the 0 position and unplug the DC J2 power supply 2 4 EPSILON CLOCK User s Manual Spectracom Corporation 3 Specifications Frequency output 10 MHz EPSILON CLOCK MODEL EC3S Rubidium OCXO Accuracy lt 1 x 10 day typical lt 1 x 10 day typical Medium Term stability lt 3 x 107 month typical lt 1 x 107 day typical Time output 1PPS Rubidium
32. ormats available are as follows e Day Month Year Hour Minute Second e Month Day Year Hour Minute Second e Day of year Year Hour Minute Second e MJD Modified Julian Day e MJD integer part Hour Minute Second With this command the user defines whether the output of the hour is issued from the UTC or GPS time reference or from the local hour with the programmed shift 5 8 TOD output transmission period This command defines the transmission period to the TOD message on the corresponding special link This period is quantified in seconds the value O inhibits permanently the transmission of the message 5 9 Alarms If the GPS input signal is lost the clock s internal oscillator is no longer disciplined The frequency accuracy and the distributed synchronization start to degrade slowly according to the ageing of the oscillator Using the alarms limits commands the user may define the accuracy limits outside of which the output signals are deemed invalid These limit values are in the form of a time difference for the 1 PPS and in the form of a relative frequency difference for the frequency outputs When these limit values are reached a fault is generated and the contact relay is closed In addition the user may activate the squelch of the frequency outputs These outputs are disabled in the same way the alarm is activated 5 2 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S 5 10 An
33. r to be used as ae RS ee aH 72 4 73 6 ey a e 73 9 6 Set GPS 74 10 19 EPSILON CLOCK User s Manual 0 7 7 2 3 Antenna positioning mode Automatic Antenna positioning mode Manual Antenna positioning mode Mobile 7 23 EPSILON CLOCK MODEL EC3S Spectracom Corporation Looe Bytes Settings Description 90 S 90 N 180 W 180 E 1 000 m to 1 800 m 18 UTC time reference D Lo Po LE ren a RE Po ODay Month 7 Year format O PO Month Day Year format O SS SS SS MJD format_ Po MD format integer part hh mn sec oo O 5 Reserved S O e e e PE LE CS no phase alarm Z a S 0 alarm immediate if synchronization is lost No interruption of frequency output Frequency output interrupted if frequency limit is exceeded or in case of hardware failure Functioning mode disciplining authorised Functioning mode off aa Sena 12 month EE 2 3 EZA 2127 year O 0 23 hours 0 59 minutes 0 59 seconds 1 Remote control not active Front panel user interface active Control 0 Remote control active Front panel user interface not active 7 24 EPSILON CLOCK User s Manual Spectracom Corporation i eg Remote 82 18 1 0 Control Frequency 84 20 4 0to3 correction EPSILON CLOCK User s Manual 0 to 3 0 2500000 2500000 Phase correction of the 1pps from 250 to 250 active function on off line mod
34. reset clock command All messages start with the STX character and end with the ETX character e g lt STX gt lt Message gt lt ETX gt The characters STX ETX or DLE to be sent within a message should be escaped prefixed by the DLE character Each message contains four distinct sections The message ID this identifies the type of message being sent The count of the number of data bytes in the message CNT The data bytes DATA of the message The checksum calculated by performing an exclusive OR on all the consecutive characters in the message ID CNT DATA e g lt Message gt lt ID gt lt CNT gt lt DATA gt lt CS gt Number of bytes 1 1 N 1 The encoding format of the DATA is based on MOTOROLA big Endian type integer long float and double data must be sent or received with the MSB first NOTE The maximum length of the lt DATA gt section is 255 bytes Messages belong to one of three categories e Queries requests for information from the EPSILON CLOCK e Commands functions that initialize or configure the EPSILON CLOCK e Error Messages returned by the clock if errors are detected in the Queries or Commands sent by the user When a user sends a message to the EPSILON CLOCK it replies within the current second This reply or acknowledgement is formatted as follows e The format of the message is identical to the message sent by the user EP
35. s lost Furthermore learning from its behavior in different situations effects attributed to aging and to temperature variations while the GPS reference signal is present the frequency driver improves on the accuracy of time and frequency distribution when the GPS signal is lost Most of the EPSILON CLOCK s functions are software controlled At start up the clock carries out a series of automatic tests including hardware tests and verification of the built in oscillator s stability before making an initial coarse adjustment to the distributed frequency After half an hour the frequency accuracy approaches 5 10 11 and the time setting is accurate to within 1us of UTC time The standard EPSILON CLOCK MODEL EC3S clock is used to generate maintain and provide the following e A synchronized UTC GPS time reference The clock distributes a 1PPS signal and a time code message corresponding to this signal e A frequency reference four 10 MHz outputs The clock is powered by AC or DC power supplies A remote control interface provides information on clock status and allows the user to send initialization and configuration commands The working status of the clock is reported locally using the three LED indicators on the front panel of the machine The relay contact output of the machine is closed in the event of hardware failure the closure on hardware or software failure is a factory setting The EPSILON CLOCK is fully automati
36. ssage Output RS 232C Electrical and mechanical ground Message Input RS232C NC NC Reserved PR ee ne il 4 4 TOD Output Time Of Day message output Output ASCII 9600 bps 8 bits 1 stop bit odd parity Protocole lt Message gt CR LF Format Day Month Year Hour Minute Second Source e g 20 03 1996_21 02 05U Format Month Day Year Hour Minute Second Source e g 11 12 1996_18 14 38L Format Day of Year Year Hour Minute Second Source e g 317 1996_ 18 16 20 L Format MJD Integer part Hour Minute Second Source eg 50399 18 20 50_U Format MJD Source Gee oe 50399 762130_L The Source byte holds one ASCII character which codes the reference of the time chosen No reference UTC reference GPS reference Local time Manual Maximum output period 1 message per second Output synchronization sent at 200 ms 100 ms after the 1PPS signal TOCZ Programmable through the remote control interface 4 2 EPSILON CLOCK User s Manual Spectracom Corporation EPSILON CLOCK MODEL EC3S Modified Julian Day Connectors J3 Mini Din 6 pins Female Pin settings Pin Setting 1 Reserved 2 NC 3 Electrical and mechanical ground 4 Electrical and mechanical ground 5 Message Output RS232C 6 NC 4 5 Alarm Connector J1 BR2 Female Resistive Contact Rating 30 VA 250 V Ground Mechanical ground of the clock 4 6 Mains Power Supply Mains power connector CCE22 with ON OFF sw
37. st 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
38. tenna Delay Correction The cable between the antenna and the clock generates a propagation delay of the GPS signal This delay corresponds to a time shift of the synchronizing signal This time shift can be compensated for using this command The correction is entered in nanoseconds and the value corresponding to the delay is linked to the type of cable and its length As a general rule of thumb the value for the delay of a coaxial cable is 5 to 6 nanoseconds per meter 5 11 Functioning mode The initial functioning mode of the clock is always synchronized on the GPS reception However the user could configure the clock in off line mode This stops the disciplining of the driver frequency and of the 1PPS In the off line mode the user has the manual setup function available 5 12 Leap second The UTC time reference maintained by the GPS clock is subject to leap second corrections the purpose of which is to maintain the difference between the atomic time represented by UTC and the astronomic time These corrections decided by the IERS are published in Bulletin C and D If the time reference used by the clock is UTC these corrections are automatically made in real time provided the GPS signal is received correctly This command allows the clock to maintain a reliable time reference by programming in advance the leap second correction ensuring it will be applied even in the case of loss of GPS signal input This command does not apply
39. tion 95 Methodist Hill Drive 3 Avenue du Canada Rochester NY 14623 91974 Les Ulis France www spectracomcorp com www spectracom fr Phone US 1 585 321 5800 Phone 33 0 1 64 53 39 80 Fax US 1 585 321 5219 Fax 33 0 1 64 53 39 81
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