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ITS Telecom 1700264, Руководство по эксплуатации

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MITS Janus Time Engine              

Page 19 of 39 

Copyright© Instrumentation Technology Systems 2020 

 

 

 

20200929 

 

When DCLS is selected any IRIG B12X signal physically connected to 
the MJTE will be ignored.  DCLS is an IRIG B00x TTL time code 
stream.   
There are several choices to make when using DCLS.  The input 
selection may be either single-ended TTL (

TTL

) or differential RS485 

(

DIFF

).  Once more, these choices are mutually exclusive.  That is, if 

TTL is chosen any differential input will be ignored and vice versa.  
It is also possible to invert the TLL or Differential signal if necessary, to normalize the DCLS 
time code stream.   
These selections are instantaneous, are saved to MJTE flash, and become the new defaults.  
An IRIG reference can never be used as a transfer standard when the MJTE is used as a PTP 
Master Clock.  PTP must report UTC time, IRIG time is generally reported at local time.  

3.4.5

 

IRIG Delay Compensation 

The IRIG Delay Compensation is an offset to the IRIG B12x received as a time reference by the 
MJTE.  This setting adds 125 nS to the received time for 
each integer value entered (#x125 ns).  For example, 
entering a value   of 10 adds 1.25 microseconds to the 
received IRIG B12x time.  The offset value is not entered 
until the 

Change

 button is clicked.  This value will also be 

saved to MJTE flash and will survive a power cycle. 

3.4.6

 

1PPS Reference 

The 1PPS reference is a clock input having a frequency of 1 pulse per 
second.  It is presumed that this reference is clock is precisely at one tick 
per second and can be used as a precision time reference.   There are two 
inputs that may be chosen mutually exclusively, single-ended 

TTL

 or 

differential (

DIFF

).  By selecting the 

Invert

 check box, this input will 

invert the phase of the signal used by the MJTE.  
These values are instantaneous, are saved to MJTE flash, and become the 
defaults. 

3.4.7

 

GPS Reference 

The GPS is an optional reference and must be included at the time of order.  
This is not a field upgrade.  If present, one may select the 

Dynamics Mode

 

by which the GPS Kalman filter evaluates a position and time solution.  
Stationary is the tightest tolerance and yields a circular error position of 
approximately 3 meters.  Each other selection indicates greater and higher 
acceleration motion.  For the GPS to provide a sustainable lock condition, 
the tolerance of error must be increased (the dynamics mode) to accommodate the anticipated 
motion vectors.   
Any value selected is instantaneous, will be saved to MJTE flash and becomes the new default. 

Содержание 1700264

Страница 1: ...September 29 2020 MITS JANUS TIME ENGINE PART NUMBER 1700264 OPERATION MANUAL...

Страница 2: ...I O Interface 10 1 2 PHOTO SONICS INTERFACE PSI O 11 1 2 1 Time code and frequency output ports 11 1 3 IRIG B TIME CODE GENERATOR 12 1 3 1 An IRIG B127 output buffer 12 1 3 2 An IRIG B007 output buffe...

Страница 3: ...20 3 5 3 Time Frame 21 3 5 4 Leap Second Adjust 21 3 6 NETWORK REFERENCE SETTINGS PAGE 22 3 6 1 PTP Frame 22 3 6 2 Timers Frame 22 3 7 PTP MASTER SLAVE MODE BEHAVIOR 23 4 0 ASCII COMMAND SET 24 5 0 P...

Страница 4: ...20 Modified commands per Engineering inputs added return responses to queries 6 25 2020 Production Release 9 25 2020 Updated the PTP Master commands Y x two places as PTP mode and PTP Master settings...

Страница 5: ...control and receive status from the MJTE Similarly it provides the control and status for the embedded webserver functions A block diagram of the aggregate MJTE is shown below 1 1 Janus Time Engine Ma...

Страница 6: ...h the priority list continues in a rotating fashion until a valid reference is found and the MJTE can be synchronized to it Should none be available time will continue to be generated driven by the NC...

Страница 7: ...all other inputs to the system A modulated input signal of 3 Vp p to 10 Vp p having a 2 1 to3 1 encoding modulation is required for proper synchronization The IRIG B00x input has an impedance 1K The i...

Страница 8: ...Master Controller There is no separate PTP Ethernet port Photo Sonics Interface PSI O As the PTP Master Clock or PTP Best Master Clock the JTEMC will synchronize its internal master clock to a refere...

Страница 9: ...fset When locked to GPS option NTP or PTP a time zone off set function is provided to localize the time reported if desired The time zone offset adds or subtracts 12 hours 15 minute corrections to the...

Страница 10: ...ut edge alignment 8 Preferred Time Reference 9 Propagation delay offsets for IRIG and NTP inputs 10 PTP terminal device or master clock setting 11 Static IP Address Port Gateway and subnet Mask 12 Tim...

Страница 11: ...where a set of pins is TTL and the other is differential Both outputs are active Clock A 10 TTL buffered output capable of driving 10 TTL loads Short circuit protected SE output termination 50 Frequen...

Страница 12: ...e polarity of these outputs independently 1 4 Programmable Frequency Generators Two programmable frequency generators are synchronized and phase locked to the time master such that a leading edge of e...

Страница 13: ...aster such that there is a fixed number of counts between one second intervals and the zero rollover aligns with the PTP 1 second rollover This method avoids jam sync jumps in the fractional seconds W...

Страница 14: ...right After login the home page on the right appears If login is required MJTE status time reference IP address and mode will not be revealed until successfully logged in When active the home pages p...

Страница 15: ...er TTL or differential Upper case indicates locked and lower case indicates it is unlocked 5 G or g The reference is the optional internal GPS receiver Upper case indicates locked and lower case indic...

Страница 16: ...activity that occurs equal to or greater than this setting will cause the webserver to automatically log out A new login will be required When restoring to factory defaults the username and password p...

Страница 17: ...leared from MJTE flash memory and will not be shown on the page 3 4 2 TCP IP Frame The TCP IP frame provides the ability to set the Janus TCG to receive addresses from a DHCP server factory default on...

Страница 18: ...to the PTP radio button the IP address of the desired NTP server must be entered in the ADRESS text box of the NTP Server frame A missing or invalid address will disable the ability of the MJTE to cre...

Страница 19: ...ds to the received IRIG B12x time The offset value is not entered until the Change button is clicked This value will also be saved to MJTE flash and will survive a power cycle 3 4 6 1PPS Reference The...

Страница 20: ...alue of 30 3 V p p Neither of these values become effective until the Change button is clicked When clicked these values are also saved to flash so that they will survive a power cycle 3 5 2 Clocks Fr...

Страница 21: ...click the Now button before the next real time second ticks When synchronized to 1PPS the 1 second rollover will be synchronized to the 1PPS tick If the MJTE becomes synchronized to an IRIG B signal t...

Страница 22: ...ed by the GPS receiver 3 6 Network Reference Settings page The network page is used to set the MJTE as either a PTP master clock or a PTP terminal device slave 3 6 1 PTP Frame MASTER SLAVE or SLAVE ON...

Страница 23: ...be the network PTP master clock In this instance the MJTE will cease transmission of Announce and Sync messages and listen for such from the BMCA winner The MJTE will not revert to PTP slave mode whil...

Страница 24: ...1 PPS IN YPMx x 0 1 where 0 TTL 1 DIFFERENTIAL YPM Return 19h PM 32h value CR as ASCII Value 1 or 0 1PPS Invert 1 PPS IN YPIx x 0 1 where 0 is in phase with 1 sec tick 1 inverted phase YPI Queries th...

Страница 25: ...ries current value Return 19h CB 32h value CR Value 1Hz 1000Hz Example 19h CB 101Hz CR Clocks Invert Clock A out YCIx x 0 is in phase with 1 sec tick 1 is inverted phase YCI Queries current value Retu...

Страница 26: ...current value Return 19h ICA 32h valuens CR as ASCII Value is 0 to 2000 Example 19h ICA 32h 2000ns CR IRIG IRIG IN Source YISx x 0 1 where 0 AM 1 DCLS YIS Queries current value Return 19h IS 32h valu...

Страница 27: ...of hour SS ssss seconds fractional seconds Misc JTE versions YVQ Returns the firmware version GPS version and MJTE serial number The string format is 19h VQ 32h S N Main GPS _EXT 32h CORE 32h CR The l...

Страница 28: ...ss sss sss subnet mask values ppppp port address 23 is telnet Factory default 192 168 150 90 192 168 150 100 255 255 255 000 0023 Any valid IP address YNS Queries the current network values Returns ne...

Страница 29: ...alue log 2 nn where nn All negative values are for x S only 6 64 sec x A only 5 1 32 5 32 sec x A only 4 1 16 4 16 sec x Aonly 3 1 8 3 8 sec 2 1 4 2 4 sec 1 1 2 1 2 sec 0 1 sec Up to 10 subscribers ma...

Страница 30: ...g 1PPS as a transfer reference in PTP Master Clock mode set UTC time if an IRIG reference is applied that does not include the year the YYYY value will be that read from the TOD until overridden by co...

Страница 31: ...t to right punctuation characters are jumped over and error checking is done on a character by character basis Invalid entries are not accepted If there is an error in the entered value press the ESC...

Страница 32: ...MITS Janus Time Engine Page 32 of 39 Copyright Instrumentation Technology Systems 2020 20200929...

Страница 33: ...CHARACTERISTICS The MJTE is a two board set preassembled into a PC104 style assembly The mounting hole placement board size and connector locations comply with the specifications of PC104 as shown PS...

Страница 34: ...5 1 1 J3 Differential Inputs PS I O board I O Connector Type Where Mate AM IRIG in IRIG DCLS in CLOCK in BNC 3 JTE Master Controller GPS optional SMA PTP NTP RJ45 1PPS out SI IRIG DCLS out SI IRIG AM...

Страница 35: ...entation Technology Systems 2020 20200929 5 1 2 J4 Differential Outputs PS I O board 5 1 3 J9 Power Connector PS I O board DIFFERENTIAL OUPUTS J4 1 1PPS_OUT 2 n 1PPS_OUT 3 GROUND 4 GROUND 5 DCLS_OUT 6...

Страница 36: ...s to default use static IP address Press at power up to actuate S3 Use DHCP IP value Press at power up to actuate S4 Enter System Test mode as start Press at power up to actuate S5 press hold at any t...

Страница 37: ...iseconds Depends on the physical location of the server LAN or WAN and how many nodes exist between it and the MJTE Locked to PTP Factory default 125 50 nanoseconds This specification presumes that al...

Страница 38: ...synchronize to the rising or falling edge of the time markers 1PPS Input This input shall be a TLL pulse per second stream where the pulse width shall be not less than 10 sec and no more than 500 sec...

Страница 39: ...Drives up to 10 TTL loads up to 100 meters over 50 coax The output is independently configurable to deliver pulses with the rising or falling edge coincident with the time master one second rollover...

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