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GPS Network Time Server

TECHNICAL: 0118 965 6000

The "Source" byte contains 1 ASCII character for coding the distributed time reference:

N No

reference

U UTC
G GPS
L Local
M Manual

•

Transmission period: 1 s

•

Transmission synchronization:

transmission at 200 ms ( 100 ms after the 1PPS

signal transition
*Programmable from the remote control interface.

Connectors:

Item:

J3 ;

Type:

mini Din 6-contact female receptacle;

layout:

Pin Description Pin Description

Reserved

Electrical and mechanical ground

2 NC

5 Message

output

(RS232C)

Electrical and mechanical ground

Summary of Contents for EHNU9070

Page 1: ... Sever LEU9070 GPS Antenna 25dB LEU9071 Antenna Cable 25 metres EHNU9070 Configuration Cable EHNU9071 TECHNICAL SALES FAX ADDRESS WEB 0118 965 6000 0118 965 5100 0118 965 5001 464 Basingstoke Road Reading Berkshire RG2 0QN www blackbox co uk ...

Page 2: ...lackbox deutschland com Web Site www blackbox com br Switzerland Canada Datacom Black Box Services AG Black Box Canada Corp Tel 055 451 70 70 Tel 0416 736 8000 Fax 055 451 70 75 Fax 0416 736 7348 Web Site www black box ch Web Site www blackbox com Netherlands Mexico Black Box Datacom BV Black Box De Mexico S A de C V Tel 030 2417700 Tel 5 420 0100 Fax 030 2417777 Fax 5 420 0123 Web Site www blackb...

Page 3: ...oration Tel 01 45 60 67 00 Tel 724 746 5500 Fax 01 45 60 67 47 Fax 724 746 0746 Web Site www blackbox fr Web Site www blackbox com Spain Chile Black Box Comunicaciones S A Black Box Chile Tel 091 663 0200 Tel 6680 141 Fax 091 661 84 35 Fax 6680 140 Web Site www blackbox es Web Site www Blackbox cl ...

Page 4: ...on to the Network 11 Step 3 Connecting the antenna 11 Step 4 Positioning the antenna 11 Step 5 Using the software 11 Step 6 Enabling servers to use the GPS Network Time server over your network 12 Start Up 13 Preliminary connections 13 Connection quality 14 Starting the clock 14 Operating faults 16 Setting out of service 16 Operation 17 Adjusting to UTC time 17 Time keeping 17 NTP server operation...

Page 5: ...000 Input Output Characteristics 22 Power supplies 22 Antenna input 22 RS 232 output J4 23 1 pps output J5 23 FREQ Outputs J6 J7 J8 J9 24 IRIG output 25 AUI output 25 10BaseT output 25 ALARM output J1 26 TOD output J3 26 Terminology 28 Glossary 29 ...

Page 6: ... output relay contact Remote control interface RS232C Ethernet output 10 MHz AUI or 10BaseT IRIG output NFS 87 500 standard compliant The manual describes the device components on site installation commissioning operation in regular service troubleshooting information and user accessible maintenance A summary of performance and a description of the clock inputs outputs are also given for informati...

Page 7: ...otely via Ethernet network under IP or by IRIG signal over amplitude coded on symmetrical pair Distribution under IP is performed using the NTP protocol for which the GPS Network Time Server is a primary timeserver In case of GPS reception loss the clock maintains the time and frequency distribution from its internal pilot Also learning of the frequency pilot behaviour effects resulting from agein...

Page 8: ... both connected to provide full redundancy The user can access the clock status data via the remote control interface Sets of commands are also available to the user to initialise or set up the clock The synthetic status of the system operation is reported locally on the three front panel indicator lights In the event of a hardware failure a relay contact output closes The GPS Network Time Server ...

Page 9: ...9 GPS Network Time Server TECHNICAL 0118 965 6000 ...

Page 10: ...guration Take the configuration cable EHNU9071 and plug the 8 pin DIN connector into the port labelled RS232 on the back of the server Connect the 9 pin D type connector into a free comm port on your PC Now take the CD supplied with the GPS Network Time Server and insert it in to your CD drive Your PC will now automatically load the software and take you through to the welcome screen From here to ...

Page 11: ...tion cable to set the IP address and subnet mask Please see your network manager for a spare IP address Alternatively select the DHCP setting for the time server to obtain a dynamically assigned IP address at startup Networking parameters are set via the Setup and then the Network menu After configuring the IP parameters reboot the server from the Clock toolbar Step 3 Connecting the antenna Unpack...

Page 12: ...our to determine correct altitude The clock can then work with any number of satellites between one and eight As soon as all the status fields turn green the GPS Time Server will be fully synchronised and ready to provide a GPS time source to your network Step 6 Enabling servers to use to GPS Network Time server over your network To enable servers on your network to use the GPS Network Time Server...

Page 13: ...ectly over 360 degrees e g at the top of an antenna mast CAUTION The GPS Network Time Server is designed to operate exclusively with the recommended GPS antenna Connecting another antenna can turn the system inefficient or even damage it irreversibly Connect the antenna to the Antenna connector For the GPS signals to be received correctly the antenna cable lightening arrester assembly should have ...

Page 14: ...e not directly submitted to weather conditions rain snow ice etc An installation of poor quality will cause operating faults from random losses of reception to total inability to receive GPS signals Such faults prevent correct slaving of the clock to the GPS reference Starting the clock Note The On Off switch of the mains input does not act on the DC Power DC power supply connected to receptacle J...

Page 15: ...ontrol interface If the fault occurs during the start up sequence both LOCKED and POWER indicator go red Under such condition the time message is no longer distributed Time Of Day message connector J3 and the clock no longer synchronizes with the GPS source In such a case contact the Black Box technical support When all indicators are out the clock is not powered When the LOCKED indicator goes gre...

Page 16: ...sitioning fault Frequency pilot fault Frequency division circuit fault Fault or impedance mismatching of the frequency or synchronization outputs Synchronization or frequency performance fault The estimated phase shift is greater than 1 s or the estimated frequency deviation is greater than 110 9 Under such condition the clock no longer synchronizes with the GPS source In this case contact the Bla...

Page 17: ...tion fault or an unavailability of the GPS constellation The reception quality of signals transmitted by the GPS satellite constellation is directly conditioned by the antenna having an open view of the sky The time data is received from the receiver is analysed by the GPS Network Time Server When the data enables the timekeeper to acquire the UTC GPS time scale the system switches over to the con...

Page 18: ...ting its local network to other networks When the system maintains a UTC time acquired by synchronization on GPS the information broadcast over the network is identified as broadcast level 1 Such information is maintained as long as the clock is locked on information reception from GPS satellites A loss of locking is indicated by the LOCKED indicator going red the broadcast NTP level is 16 which i...

Page 19: ...the on off switch of the mains input FA B R IQ U EE NFR A N C EP A RT E K E L E C29A VD EL AB A L T M A IN S90V 265V48H z 63H z60V AM A X FU S 2X250V 1AT D U S E O N L Y W I T H 2 5 0 V F U S E S E M P L O Y E R U N I Q U E M E N T A V E C D E S F U S I B L E S D E 2 5 0 V Fuse access flap CAUTION Only the following fuses can be used 250V 1A TD 5 x 20mm To replace the fuses set the on off switch t...

Page 20: ...the U T C time reference source depends directly on the oscillator used i e the OCXO described in paragraph 4 2 However following locking for a sufficient period on GPS broadcasting the intrinsic stability of the oscillator is improved by the system internal algorithm Thus if locking on GPS lasted at least 48 hrs and that subsequent unlocking follows for 24 hrs the internal reference accuracy is b...

Page 21: ...NTP This performance depends on the message path over the interconnecting network s the load on the routing networks the setup and the operating system used by the client For an exchange over a local Ethernet network with less than 80 average load and with a client implemented on a SUN SPARC Classic workstation under Solaris 2 3 the accuracy of the data transmitted by the GPS Network Time Server a...

Page 22: ...ontact female receptacle Pin layout Pin Description Pin description 1 Vdc 5 Electrical ground 2 Vdc 6 Electrical ground 3 Vdc 7 Electrical ground 4 Vdc AC Source 110 220 Volts Input voltage 90 to 265 Volts Frequency 48 to 63 Hz input power 60 V A Input protection fuses 2 x 250 V 1A TD time delayed Connector Type CCE22 receptacle with built in on off switch Antenna input The GPS Network Time Server...

Page 23: ...acteristics Transmission mode asynchronous series links Transmission level RS232C V 24 Recommendation of UIT T Transmission rate 9600 bps Coding natural binary 8 bit words odd parity 1 stop bit Logic level 1 open voltage 3 V Logic level 0 closed voltage 3 V Connector Item J4 Type mini Din 8 contact female receptacle Pin layout Pin Description Pin description 1 reserved 5 Message input 2 reserved 6...

Page 24: ... J5 Type BNC female receptacle Core periodic pulse Braid clock electrical and mechanical ground FREQ Outputs J6 J7 J8 J9 The four frequency outputs each deliver a 10 MHz frequency sine wave signal matched to 50Ω Signal time characteristics Frequency 10 MHz Wave shape sine wave Signal electrical characteristics Minimum level 10 dBm loaded with 50 Typical level 13 dBm loaded with 50 Connectors Item ...

Page 25: ...t over this network the time reference in accordance with NTP V3 Recommendation Connecting this connector to the network prevents simultaneous connection to the 10BaseT connector The output connector is a DB15 male receptacle The connection complies with the connection standard for matching to the physical layer of an IEEE 802 3 network 10BaseT output The 10BaseT is used to connect the GPS Network...

Page 26: ...t J3 The GPS Network Time Server includes an RS232 line for broadcasting a time of day message programmable via the remote control link Time Of Day Message Coding ASCII 9600 bds 8 bits 1 stop bit odd Protocol Message CR LF Format Day Month Year Hour Minute SecondSource e g 20 03 1996_21 02 05U Format Day Month Year Hour Minute Second Source e g 11 12 1996_18 14 38L Format Days Years Hour Minute Se...

Page 27: ...Transmission period 1 s Transmission synchronization transmission at 200 ms 100 ms after the 1PPS signal transition Programmable from the remote control interface Connectors Item J3 Type mini Din 6 contact female receptacle Pin layout Pin Description Pin Description 1 Reserved 4 Electrical and mechanical ground 2 NC 5 Message output RS232C 3 Electrical and mechanical ground 6 NC ...

Page 28: ...nal delivered by the internal frequency pilot Time keeper Set of functions providing the generation of time of day information sequenced on the basis of the signal output by an oscillator the frequency characteristics of which provide a representation of the time circuit to be maintained Input reference Time frequency source to which the clock slaves its internal pilot and the phases of the signal...

Page 29: ...TAL Oscillator crystal oscillator in temperature controlled enclosure SA Selective Availability degradation of the performance on GPS satellite signals for civil users TRAIM Time Receiver Autonomous Integrity Monitoring algorithms used to check the integrity of data received by the receiver from GPS satellites UDP User Datagram Protocol protocol for data packet transfer without session setting up ...

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