Installation & Operation Manual Version: 1.
Installation & Operation Manual GM-TTT Page 1 CONTENTS A1 REVISION HISTORY A2 COPYRIGHT A3 WARRANTY A4 UNPACKING/SHIPPING/REPACKAGING INFORMATION A5 SAFETY INSTRUCTIONS A6 CERTIFICATIONS & COMPLIANCES 1 INTRODUCTION TO THE GM-TTT 10 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.
Installation & Operation Manual GM-TTT Page 2 3.5 VITC 3.6 STATUS 3.7 TEST 3.8 REFERENCE 3.8.1 MODE 1: Automatic Setting and DST Mode of the Internal Clock 3.8.2 MODE 2: Time for Automatic Setting of the Internal Clock 3.8.3 1 ... 6: Status Data of the Reference Time 3.9 SERIAL 3.9.1 FORMAT: Select the Baud Rate and Format of the Serial Interface 3.9.2 PROTOCOL: Select the Remote Control Protocol 3.10 LTC IN 3.10.1 MODE: Settings for the Operation Mode Using External LTC 3.10.
Installation & Operation Manual GM-TTT Page 3 7.4 REFERENCE TIME INPUT VIA EXTERNAL LTC 7.4.1 General 7.4.2 Accepting Time, Date and Status Information of the External LTC 7.4.3 Examples 7.5 SECONDS AND MINUTES PULSE OUTPUT 7.
Installation & Operation Manual GM-TTT Page 4 A1 Revision History No. Date Subject 0.x 1.0 1.1 September 10, 2002 October 31, 2002 November 04, 2002 Preliminary IBC-2002 document, supplementary data may be published soon. 1.2 March 18, 2003 1.3 1.4 1.5 1.6 March 28, 2003 May 07, 2003 June 10, 2003 June 30, 2003 1.7 1.8 July 08, 2003 August 22, 2003 1.9 November 20, 2003 1.A 1.B 1.C December 08, 2003 February 05, 2004 November 23, 2004 A2 Headlines 3.12.1 and 3.12.2 exchanged.
Installation & Operation Manual GM-TTT Page 5 A3 Warranty Alpermann+Velte warrants that their products will be free from defects in materials and workmanship for a period of two years from the date of shipment. If this product proves defective during the warranty period, Alpermann+Velte, at its option, will repair or replace the defective product without charge, provided this product are returned to Alpermann+Velte freight prepaid.
Installation & Operation Manual GM-TTT Page 6 A4 Unpacking/Shipping/Repackaging Information This product has been carefully inspected, tested and calibrated before shipment to ensure years of stable and trouble-free service. The shipping carton and pads provide protection for the product during transit. Retain the shipping cartons in case subsequent shipment becomes necessary. Carefully unpack the product from its transit material and carefully check the product for signs of damage.
Installation & Operation Manual GM-TTT Page 7 A5 Safety Instructions The general safety information in this part is for both operating and service personnel. Alpermann+Velte products are only to be used as directed. Specific warnings and cautions will be found throughout the manual where they apply. Review the following safety instructions to avoid injury and prevent damage to this product or any products connected to it. • • • • Read these instructions. Keep these instructions. Heed all warnings.
Installation & Operation Manual GM-TTT Page 8 OBSERVE EMC REGULATIONS The EMC regulations are observed only under the following condition: use high quality shielded cables at data inputs and outputs. SUSPECTED FAILURES Whenever it is likely that safe operation is impaired, the apparatus must be made inoperative and secured against unintended operation. The appropriate service authority must then be informed. Do not operate with suspected failures.
Installation & Operation Manual GM-TTT Page 9 Electro Static Discharge (ESD) Precautions All semiconductor devices are sensitive to ESD. To prevent any damage or degradation on components of the product caused by ESD, observe these precautions when directed to do so (installing, removing sensitive components): 1. Use a Ground Strap. Wear a grounded anti-static wrist or heel strap to discharge the static voltage from your body. 2. Use a Safe Work Area.
Installation & Operation Manual GM-TTT Page 10 1 Introduction to the GM-TTT 1.1 Overview The GMGM-TTT generates linear time code (LTC) and can also optionally generate a vertical interval time code (VITC). The frames/second can be selected from most widely used formats including 24, 25, 30 and 30 drop frame. The unit generates time code according to the SMPTE standard ANSI/SMPTE 12M-1995 (revision of ANSI/SMPTE 12M-1986) for the television systems 625/50 (PAL) and 525/60 (NTSC).
Installation & Operation Manual GM-TTT Page 11 1.2 Optional Modules The following options are available: V: VITC generator • VITC contains the same time and binary groups information as the LTC. C: Colour lock for the 625/50 (PAL) television system • 4-field and 8-field, 8-field using the white flag of line 7 of a black-burst input.
Installation & Operation Manual GM-TTT Page 12 1.
Installation & Operation Manual GM-TTT Page 13 1.4 Connections at the Rear and Technical Data DSUB9F XLR4M XLR3M XLR3F DSUB9F DSUB9M 2 x BNC 2 x BNC 1 1 1 1 off 1 MTD 4 2 1 2 2 1 off 3 3 DC IN Dimensions: Weight: Operating temperature: Relative humidity: LTC OUT 3 LTC IN GPI REF. DATA IN 2 2 OPTION VIDEO/BB 214.5 (W) x 43.5 (H) x 140 (D) mm (½ 19“, 1U) 1.5 kg approx.
Installation & Operation Manual GM-TTT Page 14 GPI Option G: Relay points Switcher COM1-NC1 (Normally Closed) and COM1-NO1 (Normally Open). • Max. switchable power: 5 W. • Max. switchable voltage: 175 V. • Max. switching current: 0.25 A • Max. transportable current: 1 A Option P: Pulse outputs TTL level pulses Option A: Power supply and data telegram to drive analogue clocks.
Installation & Operation Manual GM-TTT Page 15 VIDEO/BB Input + loop-through of a CVBS or black-burst signal. Set 75 Ω termination switch to “on” position if the loop-through should be left open. With option V (VITC generator) the video input level should have 1Vpp ±15 mV. Using this input only for video genlock the sync amplitude should have 300 mV ± 6 dB.
Installation & Operation Manual GM-TTT Page 16 1.5 Functions of Buttons, Overview BUTTON FUNCTION menu Switching on/off the menu lines. ↑↓→ Buttons to operate in the menu, see detailed menu description. enter Button to operate in the menu, see detailed menu description. Pressed if menu is switched off: status display, the display shows type of the unit, configuration and software revision in same steps as after power-on.
Installation & Operation Manual GM-TTT Page 17 1.6 Status Indication by LED’s, Overview LED FUNCTION time/user On: the display shows the time information of the time code (provided the menu has been switched off). Off: the display shows the binary groups information of the time code (provided the menu has been switched off). On: Key Lock enabled. Off: Key Lock disabled. On: genlock to internal reference selected.
Installation & Operation Manual GM-TTT Page 18 free Indicates the status of the reference time input: On: the serial data input indicates a free running mode, for example a GPS or DCF77 receiver has not locked to the antenna signal. Off: the reference time source has locked to the antenna signal. Only with option GPS IN: a flashing LED indicates the number of satellites found by the receiver. mod. LED flashes every time that serial data of a reference time input has been received.
Installation & Operation Manual GM-TTT Page 19 1.7 The Menu Structure, Overview SET TIMER LTC SET START Enter a start value of the time code generator. SET USER Enter user defined data for the binary groups of the time code. SET TIME Set the time of the internal clock. SET DATE Set the date of the internal clock. USER MOD. Select what kind of information should appear in the binary groups. LOCK Select the genlock and the colour lock mode. F-RATE Select frame rate and television system.
Installation & Operation Manual GM-TTT Page 20 TEST REFER SERIAL 6 (data) Display error counter: disturbances at the genlock signal. 7 (data) Display internal register for test purposes. 8 (data) Display internal register for test purposes. (data) Display delay between internal and external genlock signal. (data) Display period of the external genlock signal. (data) Display delay between second pulse and video or black-burst genlock signal.
Installation & Operation Manual GM-TTT Page 21 1.8 After Power-On After switching on the unit the data of the non-volatile memory will be tested. If the test fails the display shows “RESET” and the factory values will be stored. If the test passes the unit will be set into same state as before switching off. After this test the display shows status messages in three steps. At same time all LED’s illuminate for test purposes.
Installation & Operation Manual GM-TTT Page 22 Step 3, display shows e.g.: Digit 8 Digit 7 Digit 6 F Digit 5 E Digit 4 D Digit 3 Digit 2 Digit 1 C B A The time zone parameters of the MTD timer A ... F has been checked. The display shows the result: an “o” means ok, “n” means parameter check failed, this time zone has been reset to standard values. Digit 1 refers to time A etc. The internal clock is set to time = 00:00:00 and date = 01.01.2002.
Installation & Operation Manual GM-TTT Page 23 2 Main Operating Modes 2.1 Fundamental Principles GM-TTT can be used in different applications, as there are: • generating a stable master LTC and VITC, • real time, local time, time zone applications, • converter LTC-to-LTC and/or LTC-to-VITC, • central unit of a timer system, • and more. GM-TTT is able to handle some of these applications simultaneously. To use the unit most effective and perfect, it is important to understand, how the unit works.
Installation & Operation Manual GM-TTT Page 24 2.2 Time Operating Mode Select this operating mode for a real time or local time application. Please notice chapter “Operating with a Real Time Reference” for installation hints. LTC output frequency • 1st preference: If the unit works within a television system, choose genlock to a black-burst or video signal (select genlock = bb at menu SET - ... - LOCK and press genlock button).
Installation & Operation Manual GM-TTT Page 25 2.3 Timer Operating Mode This operating mode enables to manipulate the time addresses of the LTC output by using an operational unit of the MTD system. LTC output frequency • 1st preference: If the unit works within a television system, choose genlock to a black-burst or video signal (select genlock = bb at menu SET - ... - LOCK and press genlock button). • 2nd preference: Press intern button to select the internal reference.
Installation & Operation Manual GM-TTT Page 26 2.4 TC Operating Mode Select this operating mode for a Jam-Sync application like refreshing, regenerating, synchronisation etc. The LTC generator accepts data from the LTC input after the LTC has passed three tests: ‘forward’ direction must be detected, it must contain a valid time and the time addresses of two consecutive frames must be in ascending and continuous order. Submenu LTC IN provides all adjustments regarding the Jam-Sync operating mode.
Installation & Operation Manual GM-TTT Page 27 MOD, for example the date (different formats) or the time and date of the LTC(MTD) format for use in the MTD system. Time code information: time address • The time addresses depends on the mode selected at menu LTC IN - MODE: if no transfer of time data is selected (only binary groups data transfer), the time addresses will be counted as a free-running counter, just counting on from the values present before switching on the tc operating mode.
Installation & Operation Manual GM-TTT Page 28 2.5 Start Operating Mode Free-running counter operating mode: when this mode is initiated by the start button, the unit simply switches to a free-running counter mode internally. Pressing this button during start operating mode and having the START function enabled (at submenu SET - ...
Installation & Operation Manual GM-TTT Page 29 3 Detailed Menu Description 3.1 General Description The menu lets you adjust parameters or pre-set values, or it shows test and status data. The menu button switches on or off the menu. With ↑ and ↓ buttons you will go to the various submenus, with the → button you reach all the items present at this submenu. Chapter 1.7 gives an overview of the menu structure. The enter button executes functions, starts set modes or stores settings.
Installation & Operation Manual GM-TTT Page 30 3.2.2 SET USER: Enter User Defined Data for the Binary Groups Press the enter button to enable the pre-set of user defined data for the binary groups of the time code. The last pre-set value appears at the display. The value of the flashing digit can be changed using the ↑ or ↓ button, the next digit can be selected using the → button. The allowed range will be 0-9 and A-F, i.e. a hexadecimal value.
Installation & Operation Manual GM-TTT Page 31 3.2.5 USER MOD.: Data Content of the Binary Groups Press the enter button to define the data content of the binary groups. The current selection appears at the display. Use the ↑ or ↓ button to step through the different items. Press the enter button to confirm your choice and to quit the menu. Please notice: in the tc operating mode the data content of the binary groups will be overwritten, if the Jam-Sync mode includes a transfer of the binary groups.
Installation & Operation Manual GM-TTT Page 32 4 BBC All binary groups are used for the date, with a special format according to EBU Technical Information I29-1995 (BBC format).
Installation & Operation Manual GM-TTT Page 33 Having “b OFF“ at menu USER MOD. selected, use → button to change the offset. Use enter button to store a new offset. Offset nn Description In Automatic setting of the offset such that the result of adding the offset to the time information gives the reference time, i.e.
Installation & Operation Manual GM-TTT Page 34 3.2.6 LOCK: Genlock and Colour Lock Mode Press the enter button to display or select the genlock mode of the LTC output. The flashing field can be changed using the ↑ or ↓ button, the next field can be selected using the → button. Press the enter button to confirm your choice and to quit the menu.
Installation & Operation Manual GM-TTT Page 35 30 Frame rate = 30 frames per second. 30 frames exactly give one second of real time (at genlock to internal reference). The LED 30 flashes slowly. With this frame rate the unit sets internal parameters according to the 525/60 television system, concerning the VITC generator, the video/black-burst genlock and some time code flag bits. 30dr Frame rate = 30 frames with drop-frame compensation, used in a 525/60 television system. The LED 30 lights up.
Installation & Operation Manual GM-TTT Page 36 3.3 TIMER This submenu handles some features in the case that the GM-TTT works as a central unit of the Alpermann+Velte MTD Time-Timer-Time Code system. Alpermann+Velte developed the Multiple Time Display System (MTD). This system supplies the video studio with time information as local time, date, time code, VTR time code, stop timers etc. A MTD system consists of a central generator, digital displays and/or index clocks as well as operational units.
Installation & Operation Manual GM-TTT Page 37 Select mode: This installation selects between two kinds of handling the time of an down-counting timer. It influences the time addresses only, not the data of the LTC(MTD). 6 6-digits operating mode: the time addresses of the LTC output will be prepared for a LTC reader display, which only displays hours/minutes/seconds. It is supposed, that the LTC reader adds one frame to compensate for delay as it is a recommended practice.
Installation & Operation Manual GM-TTT Page 38 3.3.2 U STORE / U LOAD / U RESET “U” denotes a user area. It is a non-volatile memory, in which a whole set-up of GM-TTT can be stored separately. See chapter “Factory Settings” for more details.
Installation & Operation Manual GM-TTT Page 39 3.4 LTC LTC 3.4.1 OUT Select the LTC output level. POLARITY Select the use of the polarity bit. 1 (data) Display the six time code flag bits of the LTC generator. OUT: LTC Output Level Press the enter button to display or select the LTC output amplitude. Use the ↑ or ↓ button to change, press the enter button to confirm your choice and to quit the menu. Digit 8 Digit 7 35 ... 2983 3.4.
Installation & Operation Manual GM-TTT Page 40 3.4.3 1: Display the LTC Flag Bits The display immediately indicates the flag bits of the LTC output. Each flag bit may have the value 0 or 1.
Installation & Operation Manual GM-TTT Page 41 3.5 VITC When the VITC module is installed, the settings of the VITC generator may be displayed and modified by using the enter button. The flashing field can be changed using the ↑ or ↓ button, the next field can be selected using the → button. Press the enter button to confirm your choice and to quit the menu.
Installation & Operation Manual GM-TTT Page 42 3.6 STATUS This display indicates some internal status information: 1 Internal registers: Digit 8 Digit 7 Digit 6 Digit 5 ARCNTR1 2 Digit 3 AWCNTR2 Digit 2 Digit 1 AWCNTR1 Hardware signals and CPU efficiency: Digit 8 Digit 7 Digit 6 Digit 5 EFFICIENCY 3 Digit 4 Digit 4 Digit 3 PORTB Digit 2 Digit 1 PORTA Current programming of the internal crystal oscillator reference.
Installation & Operation Manual GM-TTT Page 43 3.7 TEST This display permits to indicate some measurement results: 1 Time difference between the internal and external sync signals. The digits 8 and 7 specify the milliseconds, the example below indicates the value 39.999812 ms. It is accurate to ±125ns. Digit 8 Digit 7 Digit 6 Digit 5 Digit 4 Digit 3 Digit 2 Digit 1 = 39.999812 ms 2 Period of the external sync signal: Video or Black-Burst, respectively, or LTC signal.
Installation & Operation Manual GM-TTT Page 44 3.8 REFERENCE This submenu refers to operation using a reference time. MODE 1 and MODE 2 permit to define the essential parameters which are relevant for the automatic setting of the internal clock and for time zone operation. The remaining functions selected with the → button show the status data. REFER MODE 1 Automatic setting and DST mode of the internal clock. MODE 2 Time for automatic setting of the internal clock.
Installation & Operation Manual GM-TTT Page 45 Auto: Automatic setting of the internal clock during normal operation 0 1 2 3 4 5 No automatic setting - except those selected in the Mode setting. Every second. Once per day at the selected hour (see MODE 2). Once per week at the selected hour (see MODE 2). Once per month at the selected hour (see MODE 2). Once per year at the selected hour (see MODE 2). For selection 2 ... 5, the additional “lock“ condition has to be observed (see MODE 2).
Installation & Operation Manual GM-TTT Page 46 3.8.2 MODE 2: Time for Automatic Setting of the Internal Clock The internal clock can be automatically set in periodical intervals. As soon as the reference time ± the current offset has reached the programmed time, the internal clock is set to this time. Therefore the local time zone should be respected, when selecting the moment of time. Press the enter button to display or change the current parameters.
Installation & Operation Manual GM-TTT Page 47 3.8.3 1 ... 6: Status Data of the Reference Time The → button permits to switch different status messages referring to the reference time to the display for test purposes. 1 Reference time ± current offset. This permits to check e.g. the data communication. If the display remains empty, no valid data are received. 2 Date of the reference time (the current offset is taken into account), e.g. for testing the data communication.
Installation & Operation Manual GM-TTT Page 48 Ant. Antenna signal: -: the GPS/DCF77 receiver has received a signal. n: the GPS/DCF77 receiver is not receiving a signal. Lock “Lock“ status: -: the reference time is in-sync. F: the reference time is in free-run. Zone Time zone of the reference time: -: CET. S: CEST. U: UTC. aDST Announcement of a time switchover of the reference time: A: a DST switchover is announced during the hour before the switchover.
Installation & Operation Manual GM-TTT Page 49 3.9 SERIAL The settings of this submenu are provided for an optional remote control of the GM-TTT. The standard unit is equipped with a RS485 serial interface with fixed format and protocol. FORMAT SERIAL PROTOCOL 3.9.1 Select the baud rate and format of the serial interface (option). Select the remote control protocol (option).
Installation & Operation Manual GM-TTT Page 50 3.10 LTC IN Option L must be installed. This submenu permits to make the settings for the tc operating mode (Jam-Sync applications) and for the VTR LTC (if LTC(MTD) is generated). The data of the readout LTC may be switched to the display for test purposes. LTC IN MODE Settings for the operation mode using external LTC. OFFSET Offset programming for the time information. 1 (data) Indication of the readout LTC time.
Installation & Operation Manual GM-TTT Page 51 Standby: Behaviour of the LTC output during stop (tc operating mode) S no standby, i.e. a LTC with permanently identical data is generated during stop. Standby, i.e. the LTC output is muted during stop. Offset: Time information of the read-out LTC with offset addition o no offset, i.e. this function is not active. The offset is activated, i.e. the pre-set offset is added before adopting the read-out time.
Installation & Operation Manual GM-TTT Page 52 3.11 GPI Option G must be installed. The settings of this submenu are used for operation with a relay which may be triggered at a programmed time. A “GPI“ (General Purpose Interface) is a switching relay. The contacts between COM1and NO1 are normally open, or closed when triggered, and normally closed between COM1and NC1, or open when triggered, respectively. Switching is performed pulse-like after triggering. The pulse, i.e.
Installation & Operation Manual GM-TTT Page 53 3.12 ZONE The local time zone of the internal clock is defined by the following parameters: Time offset with respect to the reference time during normal time or Daylight Saving Time, and moments of time of the switchover from normal time to DST and vice versa. ZONE OFFS 1 Time zone offset during normal time. OFFS 2 Time zone offset during Daylight Saving Time (DST). DST on Program the beginning of the DST. DST off Program the end of the DST.
Installation & Operation Manual GM-TTT Page 54 3.12.1 OFFS 1: Time Zone Offset During Normal Time Digit 8 Digit 7 Digit 6 Digit 5 Digit 4 minutes hours Digit 3 Digit 2 Digit 1 P(+) / - Hours, minutes and the sign may be pre-set for the offset. The entry range is between -14:59 and +14:59. The sign is indicated by P (+) or -. During normal time (no Daylight Saving Time), the value of offset 1 is added to or subtracted from the reference time.
Installation & Operation Manual GM-TTT Page 55 3.12.3 DST on: Program the Beginning of the Daylight Saving Time Press the enter button to display or change the current programming. The flashing field can be changed using the ↑ or ↓ button, the next field can be selected using the → button. Press the enter button to confirm your choice and to quit the menu. Digit 8 Digit 7 week Digit 6 Digit 5 day of week Digit 4 Digit 3 month Digit 2 Digit 1 hours hours Hour of switchover, entry range 01 - 24.
Installation & Operation Manual GM-TTT Page 56 3.12.5 DST Period: Indicate Beginning and End of DST of the Current Year This display indicates the calculated date of the switchover times of the current year. It permits to check the settings after programming the start and end of Daylight Saving Time. Digit 8 Digit 7 Digit 6 day/month beginning Digit 5 Digit 4 Digit 3 Digit 2 Digit 1 day/month end In this example: DST starts on March 25, DST ends on October 28. 3.12.
Installation & Operation Manual GM-TTT Page 57 4 Genlock 4.1 Genlock to a Black-Burst or Video Signal • Connect a black-burst or CVBS video signal to BNC VIDEO/BB. • At menu SET - ... - LOCK select bb and press enter button. • Press genlock button. The LED genlock lights up if genlock is operating normally. The LED flashes if the genlock signal is disturbed and the internal reference is currently selected. If the genlock signal returns to be ok the LED will light up again.
Installation & Operation Manual GM-TTT Page 58 4.2 Genlock to a LTC Source • Connect a LTC signal to XLR3F LTC IN. • At menu SET - ... - LOCK select LTC and press enter button. • Press genlock button. The LED genlock lights up if genlock is operating normally. The LED flashes if the genlock signal is disturbed and the internal reference is currently selected. If the genlock signal returns to be ok the LED will light up again.
Installation & Operation Manual GM-TTT Page 59 4.3 Genlock to a 1pps Signal • Connect a 1pps signal to pin 1 of DSUB9M REF. DATA IN. • At menu SET - ... - LOCK select SEC and press enter button. • Press genlock button. This genlocking mode should only be used in the time operating mode. It must be provided that a real time reference delivers serial data (time and date) as well as a 1pps signal.
Installation & Operation Manual GM-TTT Page 60 5 Operation with a Real Time Reference 5.1 Connection of an External Reference The standard GM-TTT version uses an external reference, for example with a DCF77 or GPS receiver. At REF.DATA IN, GM-TTT expects to receive a serial data protocol with time, date and status data, as well as a seconds pulse (1pps signal). The data string has to be automatically sent every second.
Installation & Operation Manual GM-TTT Page 61 5.2 DCF IN Option: Installation of a DCF77 Receiver If a DCF77 receiver is installed in the GM-TTT, only the antenna remains to be connected at the OPTION 1 connector of the rear panel (BNC 50Ω). The DCF77 receiver is equipped with an autonomous, battery-buffered clock which continues to count the time during power failure or in free-run mode - when no signal is received - with an accuracy of about 10-5.
Installation & Operation Manual GM-TTT Page 62 5.3 GPS IN Option: Installation of a GPS Receiver If a GPS receiver is installed in the GM-TTT, only the antenna remains to be connected at the OPTION 1 connector of the rear panel. The GPS Module: X1 2 1 2500-1001-01 Battery on S1 1 2 3 4 5 6 78 (LED green) (LED red) The GPS receiver is equipped with an autonomous, battery-buffered clock which continues to count the time during power failure or in free-run mode - when no signal is received.
Installation & Operation Manual GM-TTT Page 63 GPS Status: Two LED’s at the front side of the GM-TTT are directly controlled by the GPS receiver and provide the following information: LED free Continuously lighting Reception status No synchronisation was performed since power-on. No synchronisation was performed since power-on. Lighting, but shortly interrupted every five seconds. Off, but shortly flashing every Real-time information was five seconds. received, but no reception possible at present.
Installation & Operation Manual GM-TTT Page 64 5.4 Option T: Battery-Buffered Clock Module This option can be installed instead of using an external reference time input or any other built-in solution. The clock module has a real time clock with a battery backup, counting time and date even if the GM-TTT has been switched off. So the GM-TTT is able to start with a valid real time after power-on. The clock module counts UTC, i.e. a time zone without Daylight Saving Times.
Installation & Operation Manual GM-TTT Page 65 5.5 Time Transfer During Normal Operation and Time Jumps In the time operating mode, the GM-TTT generates a “real-time“ time code and receives data from a reference clock. Which of the systems is the "master" and how “wrong“ or “real“ time jumps are treated, is explained as follows. “Wrong“ Time Jupms: Generally, only a reasonable time and a reasonable date are accepted by the reference clock.
Installation & Operation Manual GM-TTT Page 66 After a setting has occured, the amount of time code deviation with respect to "real time" depends upon the accuracy of the crystal (of the GM-TTT or the sync-generator): Deviation by frames: with an accuracy of 10-8 10-7 10-6 after one day 0,02 0,2 2 after 30 days 0,65 6,5 65 To achieve target 3, the GM-TTT should be synchronised either to a stable seconds pulse of the receiver clock or - if the time code has to be generated in-sync with the video signal -
Installation & Operation Manual GM-TTT Page 67 5.6 Internal Clock, Automatic DST mode, Binary Groups with Date and Status The GM-TTT has an internal clock which counts time and date. The start value after power-on is 00:00:00:00 and 01.01.2002. The clock is set manually (SET - ... - TIME, SET - ... - DATE) or by a reference. The time zone of the internal clock is either normal time or DST.
Installation & Operation Manual GM-TTT Page 68 5.7 Real Time Coupling of Time Code and Video The safest method to generate a real time coupled time code which is in sync with the video signal is to synchronise the video sync generator (SPG) to real time. Some DCF77 or GPS systems offer a stable 10MHz output, and some SPG's may also be coupled by using these 10MHz. Furthermore, a stable seconds pulse is used, which is output from the DCF77 or GPS receiver.
Installation & Operation Manual GM-TTT Page 69 The following diagrams illustrate the behaviour of real time and time code: Real time LTC of the video system 625/50 1. Perfect synchronisation = V1 + color burst locked to P_Sec, LTC with colorframing Sec. = 00 P_Sec Video CF 6 59:24 LTC CF 8 5 4 00:02 00:01 2 1 3 01:00 00:24 7 6 00:03 8 1 00:04 2 3 4 5 00:06 00:05 5 4 6 01:02 01:01 8 7 1 01:03 3 2 01:04 4 6 5 01:05 7 01:06 Sec.
Installation & Operation Manual GM-TTT Page 70 6 Further Details 6.1 Factory Settings At first delivery or having carried out the function FACTORY RESET the standard unit will have the following settings: Basically all is set to zero or switched off, except: Frame rate LTC output level VITC parameters Genlock mode User mode Display Key lock LTC generator operating mode 25 1.5 Vpp Lines 18 and 20 Video/black-burst 1 = TTT, i.e.
Installation & Operation Manual GM-TTT Page 71 These data may be altogether written into different storage areas. These storage areas are organised as follows: Area “F”: factory settings of GM-TTT; these non-erasable data are stored in a ROM. Area “S”: backup memory, which stores all changes made during current operation. These data are stored in an EEPROM and are hence available after power-on. Area “U”: user area, which permits to store a complete system setting separately.
Installation & Operation Manual GM-TTT Page 72 6.2 Maintenance Placement of fuse, modules, SW1 and pots for adjustments SW1: LTC output floating yes/no: In position 1 (factory setting) = not floating: Pin 1 of the LTC Out connector is GND, the signals at pin 2 and 3 are inverted against each other and each of them is symmetrical to pin 1. The output level between 1-2 and 1-3 is set according to the menu. Neither pin 2 nor pin 3 shall be externally connected to GND.
Installation & Operation Manual GM-TTT Page 73 7 Optional Modules and Functions 7.1 Colour Lock Option C: To use this function, the corresponding hardware module must be installed. When displaying the equipment status (after power-on or when pressing the enter button with the deactivated menu) it is possible to check, if the module was detected. Colour framing is performed by using the signal at the VIDEO/BB BNC connector; this signal is also used for video synchronisation.
Installation & Operation Manual GM-TTT Page 74 7.2 VITC Generator Option V: To use this function, the corresponding hardware module must be installed. When displaying the equipment status (after power-on or pressing the enter button with deactivated menu), it is possible to check, if the module was detected. VITC is inserted into the signal at the VIDEO/BB BNC connector and output at the OPTION 2 BNC connector. The VITC data are identical with the LTC data. Genlock = bb must be switched on: In the SET - ..
Installation & Operation Manual GM-TTT Page 75 7.3 Serial Remote Control Interface 7.3.1 General In this option, the standard RS485 module is replaced by a RS232 module (option 2) or a RS422 module (option 4). With that GM-TTT can no longer work as a central unit of the MTD system, because now the communication interface to the control units of this system is missing. The GM-TTT may be partially remote-controlled via the serial RS232 or RS422 interface. The current time code data may be requested.
Installation & Operation Manual GM-TTT Page 76 7.3.
Installation & Operation Manual GM-TTT Page 77 *1 DATA 1: Bit 7 = 1 Bit 6 = 0 Bit 5 = 1 Bits 7..
Installation & Operation Manual GM-TTT Page 78 7.4 Reference Time Input via External LTC 7.4.1 General This function requires a special firmware and a hardware module (option L). When displaying the equipment status (after power-on or pressing the enter button with deactivated menu), the presence of this special feature will be indicated during the second step of the status messages: digit 5 shows a “3”. Basically this special feature is only a different way of a reference time input.
Installation & Operation Manual GM-TTT Page 79 2, 4 - 9, The LTC input carries a date as described for the corresponding numbers at subA, b menu SET - ... - USER MOD (2 = 2 DATE, 4 = 4 BBC, etc.). Selection b = b OFF works same way as selection 4 = 4 BBC, i.e. no offset will be calculated. RT-LTC can be selected independent from a selection at USER MOD. There is no status available from the LTC input, so the status is set as described for RT-LTC selection 0 or 1.
Installation & Operation Manual GM-TTT Page 80 Example 3: Input = output = CET/CEST The LTC input carries a time (e.g. CET/CEST) with Daylight Saving Time (DST) switching, and a date and status information. The LTC input conforms to the specification of GM-TTT USER MOD = 3 STATUS. The LTC output should have the same time zone. • At sub-menu REFER - MODE 1: Mode (Digit 6) = o or A, RT-LTC (Digit 4) = 3.
Installation & Operation Manual GM-TTT Page 81 7.5 Seconds and Minutes Pulse Output Option P: this option requires an additional hardware. When displaying the equipment status (after power-on or pressing the enter button with deactivated menu), it is possible to check, if this option is present: • At first step of status display digit 1 shows an “o“. • At second step of status display digits 2 and 1 show the identification “03“.
Installation & Operation Manual GM-TTT Page 82 7.6 Analogue Master Output Option A: this option requires an additional hardware. This option can be installed together with option DCF IN or GPS IN. With this option a distribution amplifier supplies the analogue clocks of the Alpermann+Velte MTD system with power as well as with time data. The time data forms a telegram similar to the German radio time telegram DCF77. The data bits are transmitted every second except at seconds = 59.
