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EPSILON CLOCK MODEL EC20S

Spectracom

73

User’s Manual

then transits to 0D reception mode. That means that the GNSS
receiver tracks only one satellite channel and then improves the
accuracy of the time.

- Stationary

The GNSS antenna is stationary and its accurate position is input
by the user. The accurate position so input is then set in the
GNSS receiver which then transits to 0D reception mode. That
means that the GNSS receiver tracks only one satellite channel
and then improves the accuracy of the time.

- Mobile

The  GNSS  antenna  is  not  stationary.  The  GNSS  receiver
computes  and  delivers  the  antenna  position  every  second  so
that the EC20S (with  the GNSS  antenna)  can be moved.  In this
case,  the  GNSS  receiver

doesn’t

transit to the 0D reception

mode.

79.

GNSS LATITUDE, GNSS LONGITUDE, GNSS ALTITUDE

Geographical coordinates of the stationary GNSS antenna position that is applied in the
GNSS Stationary mode (see above GNSS Mode).

Unity: Latitude and Longitude in degrees-minutes-seconds-milliseconds (for the web
interface) and milliseconds only (for the SNMP interface). Altitude in meters (for both web
and SNMP interface).

80.

GPS CONSTELLATION

Defines whether the GPS satellites constellation is part of the GNSS synchronization source
or not:

- Yes

The GPS satellites constellation is part of the GNSS
synchronization source.

- No

The GPS satellites constellation is not part of the GNSS
synchronization source.

81.

GLONASS CONSTELLATION

Defines whether the GLONASS satellites constellation is part of the GNSS synchronization
source or not.

- Yes

The GLONASS satellites constellation is part of the GNSS
synchronization source.

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Содержание Spectracom EC20S

Страница 1: ...EPSILON CLOCK MODEL EC20S User s Manual spectracom com Ref Number 170142 Revision Rev7 26th of February 2018...

Страница 2: ...s document at any time and without notice Any software that may be provided with the product described in this document is furnished under a license agreement or nondisclosure agreement The software m...

Страница 3: ...TION 15 4 1 Inventory 15 4 2 Inspection 15 5 FRONT AND REAR PANELS DESCRIPTION 16 5 1 Front Panel Description 16 5 2 Back Panel Description 17 6 PUTTING THE EC20S INTO OPERATION 18 6 1 Preliminary Con...

Страница 4: ...2 External 1PPS Synchronization Source 26 9 3 External NMEA Datation Source 28 9 4 Synchronization Sources Monitoring 28 10 OPERATIONAL TASKS 28 10 1 Selection of the Synchronization Source 28 10 2 Di...

Страница 5: ...13 3 4 GNSS Status 52 13 4 Administrator Password page 55 13 5 Network Setup page 56 13 6 SNMP Traps Setup page 58 13 7 Time Synchronization Source Setup page 63 13 7 1 User defined datation 64 13 7...

Страница 6: ...US PARAMETERS 86 14 1 2 SNMP CONFIGURATION PARAMETERS 89 14 1 3 SNMP TRAPS 92 15 COMMAND LINE INTERFACE CLI 94 15 1 Network settings 94 15 2 SNMP settings 96 15 3 EC20S restart 96 16 LEAP SECOND APPLI...

Страница 7: ...on 100 18 2 Updating the Software Version 100 18 3 Spare Parts 100 18 4 Troubleshooting 100 18 5 Customer Support Information 101 19 APPENDIX 102 19 1 NMEA Connector 102 19 1 1 Pin Out 102 19 1 2 NMEA...

Страница 8: ...Satellite System GPS Global Positioning System US HTTP HyperText Transfer Protocol ICMP Internet Control Message Protocol IERS International Earth Rotation Service IRIG Inter Range Instrumentation Gr...

Страница 9: ...lications using SFN Single Frequency Network mode The EC20S gives the high reliability required at any step of the network from SFN adapters to high and medium power transmitters and gap fillers The E...

Страница 10: ...14 SNMP Interface Stratum 1 time stamp over Ethernet 10 100 Base T RJ45 port Local monitoring via signalling interfaces 11 1 Visual Signalling 11 2 ALARMS Signalling 2 2 DIMENSIONS AND WEIGHT Width 19...

Страница 11: ...C20S 11 User s Manual 2 3 OPERATING ENVIRONMENT Operating temperature With OCXO 5 to 60 C With Rubidium Oscillator 5 to 50 C Storage temperature 40 to 85 C Relative humidity 95 non condensing Altitude...

Страница 12: ...serted 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 p...

Страница 13: ...any other equipment that has a connection to the earthing conductor of the same AC or DC supply circuit earthing conductor and also the point of earthing of the AC or DC system The AC or DC system sha...

Страница 14: ...el power switch will not remove all power sources Remove all power sources by removing both the AC and DC power cords connected to the equipment DC power Cord connector must be unlock before removing...

Страница 15: ...ge ESD Observe all applicable ESD precautions and safeguards when handling the Spectracom equipment NOTA If the EC20S equipment is returned back to Spectracom it must be shipped in its original packin...

Страница 16: ...ent status of the enabled synchronization source GNSS External 1PPS NMEA synchronization source For details see 11 1 DST LED DISTRIBUTION LED Indicates the current status of the distributed 1PPS and 1...

Страница 17: ...uts 10MHz J2n 50 BNC Distributed sinus frequency outputs EXT External 1PPS 50 BNC External input for a 1PPS Synchronization source Ethernet 10 100 BaseT 50 BNC Network connectivity GPS Antenna 50 N An...

Страница 18: ...ble refer to 8 into the Ethernet input RJ45 input Connect the multi GNSS antenna into the GPS antenna input to acquire the multi GNSS synchronization source refer to 9 1 and refer to the document Outd...

Страница 19: ...System Setup Network Setup web page Enter the administrator password factory defaulted to pwd Input the IP address allocation mode static or DHCP and the EC20S static address if necessary In case of...

Страница 20: ...S NMEA synchronization source 6 5 START UP SEQUENCE For a standard configuration implementing the multi GNSS synchronization source after the system initialization sequence the GNSS receiver locks to...

Страница 21: ...8 Volts DC Maximum Total Power consumption 55 W Protection against polarity reversal 48V and 0V DC input wires are not ground referenced Protected by a PolySwitch fuse automatically rearmed Threshold...

Страница 22: ...accessible on the network o Static assignment Use DHCP Off This mode is also automatically selected by the EC20S if the EC20S is not connected to the network or if no DHCP server is accessible The po...

Страница 23: ...MIB browser using the SNMP protocol The EC20S incorporates a SNMP server accessible through the port numbers 161 for the get set methods and 162 for the trap events For details about the SNMP interfac...

Страница 24: ...t and accessible through the port number 23 This service is only available for Spectracom software administrators 8 2 6 FTP SERVICE The EC20S can be upgraded using the web interface The uploading of n...

Страница 25: ...e 80 81 and 82 for the details GPS constellation only or GLONASS constellation only or GALILEO constellation only Both GPS and GLONASS constellations or Both GPS and GALILEO constellations CAUTION Usi...

Страница 26: ...ing parameters have been modified in order to provide more stable 1 pps and 10 MHz signals when using combined GPS and GLONASS satellites The best stability is still obtained however when using GPS on...

Страница 27: ...nt the EC20S switches from the main GNSS synchronization source to this synchronization source the SFN conditions are lost until the new synchronization source is Locked And so the distribution of the...

Страница 28: ...When this datation source is not used it is strongly recommended to disable it this is the factory setting See 13 7 3 NMEA Datation for External 1PPS 9 4 SYNCHRONIZATION SOURCES MONITORING The validi...

Страница 29: ...arch Fast oscillator disciplining with coarse adjustment of the oscillator command The EC20S is searching best disciplining conditions Locked Accurate oscillator disciplining with long time constant f...

Страница 30: ...the Holdover status But if a synchronization source is selected before the end of the latency delay the oscillator disciplining resumes no alarm will be raised The SFN conditions are defined by the S...

Страница 31: ...aragraphs In Automatic mode the synchronization signals 1PPS 10MHz are delivered once the initialization of the EC20S is complete only if the EC20S meets the SFN conditions i e when SFN Status is On s...

Страница 32: ...eption quality Tinit Initialization Time Start of EC20S software 2 minutes typical Twarm Warm Up Time 5 minutes typical depending on the oscillator Tts Tracking Search Time Depending on the synchroniz...

Страница 33: ...loss of the GNSS synchronization source 120 seconds TgnssAcq GNSS Source Acquisition Time Latency upon acquisition of the synchronization source 15 seconds Holdover Locked on the GNSS source On On On...

Страница 34: ...gnssLoss GNSS Source Loss Time Latency upon loss of the GNSS synchronization source 120 seconds Locked on the GNSS source On On On OK External 1PPS NMEA Ref Locked Tracking Search Locked on the Extern...

Страница 35: ...synchronization source 120 seconds Thold Holdover Time Time before phase or frequency alarms occur Depending on the synchronization setup Holdover Locked on the GNSS source On Off On Off On Phase or F...

Страница 36: ...Indicates the status of the AC and DC power supplies Red Blinking Indicates Initialisation of product Red Indicates general fail of product Yellow Indicates the missing of one power supply Green Indi...

Страница 37: ...onization source NOTA In operational step all the LEDs are Green Only available synchronization sources should be enabled see 9 2 and 9 3 Only available AC DC power alarms should be enabled see 7 2 11...

Страница 38: ...lator fault Internal 1PPS fault The ECS0S doesn t meet the SFN conditions see 10 2 A 1PPS output signals is in fault A 10MHz output signal is in fault 11 2 2 NON URGENT ALARMS Non Urgent Alarms GNSS M...

Страница 39: ...S pulse width 100 S Accuracy to UTC GNSS locked 25ns 1 Accuracy to UTC instantaneous phase locked 35ns max Holdover constant temperature 24 hours GNSS locked OXCO Rubidium oscillator after 4 hours 0 8...

Страница 40: ...m User s Manual 40 Port configuration Asynchronous RS232C 9600 bauds 8 bits 1 stop bit no parity TOD messages format GPRMC from NMEA 0183 V3 01 For detailed information about this output interface ref...

Страница 41: ...C to the EC20S Ethernet port and launch a HTTP navigator with the EC20S IP address The PC Operating System can be Windows or Linux The EC20S web interface has been tested with the following HTTP navig...

Страница 42: ...rameters protected by the administrator password ii GNSS Setup GNSS reception parameters protected by the administrator password iii Power Setup Enable of power supply monitoring alarm protected by th...

Страница 43: ...web pages header is defined by an alphabetic character as follows U UTC timescale either UTC USNO from GPS constellation or UTC SU from GLONASS constellation L Local Time UTC timescale programmed loc...

Страница 44: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 44 13 3 CLOCK STATUS PAGE...

Страница 45: ...The EC20S goes in this status when it is set in Force Holdover mode see 13 7 3 Alarm An urgent alarm is raised refer to 11 2 2 to know the list of the urgent alarms The distribution of the synchroniz...

Страница 46: ...LOCK MODEL EC20S Spectracom User s Manual 46 Range from 0V to 8V Generates an Internal Oscillator alarm when the value reaches 0V or 8V meaning that the EC20S is no longer able to drive the Internal O...

Страница 47: ...oscillator disciplining has been suspended upon user request see 13 7 3 Force Holdover 8 SYNCHRONIZATION TIME Time during which the EC20S is synchronized to a valid synchronization source Unity secon...

Страница 48: ...d see 13 7 3 13 FREQUENCY ACCURACY Status of the estimated frequency accuracy during a holdover period OK The frequency accuracy is below the Alarm Frequency Threshold see 13 7 3 Alarm The frequency a...

Страница 49: ...eceiver The communication with the GNSS receiver is interrupted or the 1PPS signal is not delivered by the GNSS receiver 13 3 2 5 EXTERNAL SOURCES 16 EXTERNAL 1PPS Status of the external 1PPS source O...

Страница 50: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 50 Status of AC power OK AC power is present Alarm AC power is missing Disabled AC power alarm is disabled by the user See 13 9 Power Setup...

Страница 51: ...oesn t deliver any signal shut off for frequency accuracy alarm see 13 7 3 or time conditions see 13 7 5 21 GLOBAL 1PPS OUTPUTS Monitoring of the 1PPS output signals delivered by the EC20S OK Every 1P...

Страница 52: ...of the GNSS antenna 26 SELF SURVEY Not applicable in Stationary and Mobile GNSS modes see 78 In Automatic GNSS mode the Self Survey status reports the progression of the period during which the accur...

Страница 53: ...MODEL EC20S Spectracom 53 User s Manual GPS Global Positioning System USA positioning system GLONASS GLObalnaya NAvigatsionnaya Sputnikovaya Sistema Russian positioning system GALILEO European positi...

Страница 54: ...e time and or the position 30 BEST SATELLITES ID SNR Satellite channel identifier and SNR Signal over Noise Ratio of the 8 best satellite channels tracked by the GNSS receiver 13 3 4 1 EXTERNAL NMEA D...

Страница 55: ...istrator password called Admin password is necessary to access the setup pages The default password is pwd It can be modified in the Admin page see 13 13 WARNING If the user doesn t remember the passw...

Страница 56: ...ervice is available In this case a dynamic IP address is automatically allocated to the EC20S by the DHCP server according to the EC20S MAC address The other input fields do not apply When the DHCP se...

Страница 57: ...rvice is not required Use DHCP No these input fields are applied to configure the network access NOTA The network configuration can be reset to factory settings at any time while pressing more than 2...

Страница 58: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 58 13 6 SNMP TRAPS SETUP PAGE...

Страница 59: ...nu 39 TRAP COMMUNITY Trap community for trap events Needed to easily identify a family of monitored devices Defaulted to public 40 IP ADDRESS TRAPS DESTINATION 1 Primary SNMP manager address where tra...

Страница 60: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 60 No No trap is generated...

Страница 61: ...rally the oscillator goes on default No No trap is generated 48 INTERNAL 1PPS FAULT Yes Generates a trap when the 1PPS driver goes on alarm No No trap is generated 49 PHASE ACCURACY FAULT Yes Generate...

Страница 62: ...urce alarm is detected No No trap is generated 54 1PPS OUTPUT FAULT Yes Generates a trap when one of the 1PPS output signal fails No No trap is generated 55 10 MHZ OUTPUT FAULT Yes Generates a trap wh...

Страница 63: ...ODEL EC20S Spectracom 63 User s Manual 13 7 TIME SYNCHRONIZATION SOURCE SETUP PAGE This page is used for setting time computation and display parameters synchronization source parameters and distribut...

Страница 64: ...me manually set by the user 13 7 2 DATATION SETUP 59 FORMAT OF THE DISPLAYED DATATION Format of the displayed Time of Day messages DD MM AAAA day month year MM DD AAAA month day year DD AAAA day of th...

Страница 65: ...EPSILON CLOCK MODEL EC20S Spectracom 65 User s Manual For ToD messages on the web pages see 13 2 Upper Task Bar and Page Header description...

Страница 66: ...case of GNSS loss Date when to apply the leap second 31 03 31 03 30 06 30 06 30 09 30 09 31 12 31 12 63 OFFSET FOR LOCAL TIME HH MM Time shift between the local time and the UTC time Unity hours and m...

Страница 67: ...EPSILON CLOCK MODEL EC20S Spectracom 67 User s Manual Off Normal disciplining mode the oscillator disciplining is in progress...

Страница 68: ...y 2 Medium priority Priority 3 Lowest priority Disabled Disable the source this source is no longer part of the synchronization sources no corresponding alarm 68 FORCE A SOURCE AS INPUT Force the EC20...

Страница 69: ...w the threshold or not the estimated frequency accuracy is above the threshold See 13 3 2 2 Unity None f f 10 9 Range 0 1000 10 9 Default is 1000 10 9 Specific value If the field is zeroed Frequency a...

Страница 70: ...Once the EC20S have met the SFN conditions for the first time the output 10MHz signals are always distributed whatever their quality is 13 7 5 DISTRIBUTION STATUS FOR ON TIME MUTE MODE When this mute...

Страница 71: ...76 ENABLE AFTER LOCK OF A SYNC SOURCE This delay starts upon the selection of a valid synchronization source if no synchronization source was selected before The synchronization signals 1PPS 10MHz are...

Страница 72: ...The GNSS antenna is stationary and its position is automatically computed by the EC20S The EC20S gets the current antenna position from the GNSS receiver every second for one hour A current position i...

Страница 73: ...ver doesn t transit to the 0D reception mode 79 GNSS LATITUDE GNSS LONGITUDE GNSS ALTITUDE Geographical coordinates of the stationary GNSS antenna position that is applied in the GNSS Stationary mode...

Страница 74: ...receivers 82 GALILEO CONSTELLATION Defines whether the GALILEO satellites constellation is part of the GNSS synchronization source or not Yes The GALILEO satellites constellation is part of the GNSS...

Страница 75: ...operator must set which power alarm AC or DC left and right should be enabled 83 AC POWER Check AC power supply Enable Generates an alarm if AC power supply is not available Disable No alarm generated...

Страница 76: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 76 13 10 EVENTS LOGGING This page displays the events log recorded by the EC20S in a chronological order...

Страница 77: ...dysfunction of a minor or redundant function and therefore doesn t affect the normal functioning of the EC20S Information The event reports the end of an alarm or a warning event or a user action Alar...

Страница 78: ...link to download the events log A left click only displays the whole events log Important note For version 16 04 and higher log file is now not generated automatically to avoid Watchdog reset A button...

Страница 79: ...ser s Manual Archive version Version of the EC20S software System version Version of the EC20S system Firmware version Version of the firmware of the EC20S FPGA 86 GNSS FIRMWARE VERSION Name and Firmw...

Страница 80: ...d configuration archive file see 13 13 3 shall not be uploaded These files only aim at providing trouble shooting support data To upgrade the EC20S software follow these steps Select the software arch...

Страница 81: ...1 User s Manual Uploading is complete when the below screen is displayed Then start the next software installation on the EC20S target while clicking on the Install button Once the new software is ins...

Страница 82: ...EPSILON CLOCK MODEL EC20S Spectracom User s Manual 82 13 13 ADMIN PAGE...

Страница 83: ...and 10MHz distribution Reset to default setup Clear events log Click on the Activate button to reset the EC20S current settings to the factory settings and clear the events log Note that the network...

Страница 84: ...m at restoring an EC20S configuration Extracted configuration archive files shall not be uploaded from the Software Upgrade web page 13 12 13 14 REBOOT If the unit can t be accessed via a network serv...

Страница 85: ...ftware version below 17 02 but it can deliver inaccurate 1PPS for short periods when restarting starting stops the signals distribution 1PPS 10MHz when using software version 17 02 and higher But it a...

Страница 86: ...lements the v2c release of the SNMP protocol The MIB includes the following SNMP objects 14 1 1 SNMP STATUS PARAMETERS Status parameters can only be read using the GET method These parameters have a r...

Страница 87: ...lete ec20s STA OPT STANAG OUT Obsolete ec20s STA OPT 2MHZ OUT Obsolete ec20s STA SFN 4 ec20s STA TYPE OSCILLATEUR 9 90 PHASE ERROR Phase error estimated by the Kalman filter kdt implemented by the dis...

Страница 88: ...30 ec20s GPS SAT ANTENNA MODE 78 ec20s GPS RECEPTION MODE 92 ec20s GPS ANTENNA STATUS 15 ec20s GPS LATITUDE 24 ec20s GPS LONGITUDE 23 ec20s GPS ALTITUDE 25 92 GNSS RECEPTION MODE Reception mode or Tac...

Страница 89: ...cription Ref ec20s GNSS STA MODEL 22 ec20s GNSS FW VERSION 86 ec20s GNSS STA SAT USED ALL 27 ec20s GNSS STA SAT USED GPS 29 ec20s GNSS STA SAT USED GLONASS 29 ec20s GNSS STA SAT USED GALILEO 29 14 1 2...

Страница 90: ...59 ec20s CFG 1PPS MUTE AUTO 72 ec20s CFG 10MHZ MUTE AUTO 73 ec20s CFG MUTE LOST SOURCES TIME 74 ec20s CFG MUTE POWER ON TIME 75 ec20s CFG MUTE ACQ SOURCE TIME 76 ec20s CFG RESTART INETD 95 ec20s CFG...

Страница 91: ...EPSILON CLOCK MODEL EC20S Spectracom 91 User s Manual 98 RESTART EC20S 1 the EC20S unit restarts...

Страница 92: ...rs have an accessible for notify access authenticated by the Trap community which is defaulted to public Traps are sent by the EC20S to destination addresses which can be set via the SNMP Setup web pa...

Страница 93: ...ult 49 ec20sFreqAccuracyFault 50 ec20sSyncSourceChangeAlarm 51 ec20sEnteringHoldoverModeAlarm 99 ec20sPowerFault 53 ec20sOptionIrig Obsolete ec20sOptionStanag Obsolete ec20sOption2MHz Obsolete ec20sOu...

Страница 94: ...pen a RS232 serial session with the following settings Speed 9600 Parity None Data size 8 bits Stop bit 1 Type Return and the following menu is displayed 15 1 NETWORK SETTINGS NOTA Network addresses a...

Страница 95: ...k To set the sub network mask of the EC20S 4 Sub network address To set the sub network address of the EC20S 5 Broadcast address To set the broadcast address of the EC20S 6 Default gateway address To...

Страница 96: ...EC20S can be restarted using the menu 0 Reboot system 16 LEAP SECOND APPLICATION The EC20S can apply a leap second to its UTC timescale as follows In Operator mode The operator defines the leap secon...

Страница 97: ...ced performance options are available 17 1 PHASE LOCK IN AT POWER UP 17 1 1 WARMING UP Warm up time for the local oscillator before tracking search 5 minutes A subsequent fast tracking search brings t...

Страница 98: ...available the EC20S transits into the Holdover mode in which it maintains the generation of the Time of Day messages and the synchronization output signals 1PPS 10MHz According to EN 300462 4 1 9 2 Tr...

Страница 99: ...ndustrial environments FCC Part 15 Edition 2008 Radio frequency devices Subpart B Unintentional Radiators Limits and methods of measurement of radio disturbance Characteristic of information technolog...

Страница 100: ...anufacturer part number NC3FXY female plug 18 4 TROUBLESHOOTING Some EC20S faults and anomalies can be diagnosed from the visual signaling provided by the front panel LEDs see 11 1 the ALARMS signalin...

Страница 101: ...rvice is available by telephone at 33 0 1 64 53 39 80 France or 1 585 321 5800 United States Updated contacts information are available on our web site www spectracom com and refer to the Support page...

Страница 102: ...l 102 19 APPENDIX 19 1 NMEA CONNECTOR 19 1 1 PIN OUT Type of connector SUB D9 Female The pin out of the connector is described in the following table 1 NC 6 NMEA_RS485_A 2 NMEA_OUT 7 NMEA_RS485_B 3 NM...

Страница 103: ...nnected GND Ground NMEA_IN Receive line input of the NMEA message RS232 compatible level NMEA_OUT Transmit line output of the NMEA message RS232 compatible level NMEA_RS485_A NMEA_RS485_B Transmit lin...

Страница 104: ...A OK V warning o llll ll Latitude of emitter not used by the EPSILON CLOCK MODEL EC20S o a N or S North or South of emitter not used by the EPSILON CLOCK MODEL EC20S o yyyyy yy Longitude of emitter no...

Страница 105: ...ILON CLOCK MODEL EC20S A OK V warning IF the datation source is not valid THEN S V ELSE the datation source is valid THEN IF the EC20S is in Forced Holdover mode Ref 65 THEN S A ELSE the EC20S is NOT...

Страница 106: ...al 106 19 2 ALARM RS232 SERIAL PORT CONNECTOR Type of Connector SUB D9 Female The pin out of the connector is described in the following table 1 RL_URG_C 6 RL_URG_T 2 CTRL OUT 7 RL_URG_R 3 CTRL IN 8 R...

Страница 107: ...losed contact To get a closed contact when an Urgent Alarm see 11 2 1 is raised 1 and 7 pins shall be used To get a closed contact when a Non Urgent Alarm see 11 2 2 is raised 4 and 8 pins shall be us...

Страница 108: ...Type of Connector XLR Male Use a XLR Female connector to supply the product This DC input is isolated so a positive or negative power supply can be used Positive Case Negative Case Pin 1 24V 0V Pin 2...

Страница 109: ...TP and DC Connector Rev2 12 02 14 Multi GNSS source Rev3 25 09 14 Information of the type of embedded oscillator NTP Stratum Management Rev4 06 03 2015 NTP Stratum values modified Rev 5 20 03 2015 Mut...

Страница 110: ...e 460 Rochester NY 14623 Lat 43 084300 Long 77 585600 Phone 1 585 321 5800 Fax 1 585 321 5219 Contact sales sales spectracom com Contact support https spectracom com support SPECTRACOM FRANCE Parc Tec...

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