User`s Manual Messenger Digital Transmitter-D (MDT-D)
Contents
1. 25 100 M0068X2A 3 of 25 www cobham com gms 1 0 Acronyms This section lists and describes the various acronyms used in this document Name 16 QAM 64 QAM AES ABS ASI COFDM CVBS Y D C DDR DVB T DDPC FEC GUI HS TS I O Kbaud Kbps Mbps LVDS LVTTL MDL MDR MDT D MER MPEG MSR NTSC PAL QPSK RF RX SDI SDML SDMT S N THD TX VDC 100 M0068X2A Meaning 16 state Quadrature Amplitude Modulation 64 state Quadrature Amplitude Modulation Audio Video Advanced Encryption System 32 bit Messenger Basic Scrambling 8 bit Asynchronous Serial Interface Coded Orthogonal Frequency Division Multiplexing Composite video Luminance with S video Chroma video Down Converter Digital Diversity Receiver Digital Video Broadcasting Terrestrial Digital Data Processor Card Forward Error Correction Graphical User Interface High Speed Transport Stream Input Output Kilobaud per second Kilobits per second Megabits per second Low Voltage Differential Signaling Low Voltage TTL Messenger Digital Link Messenger Digital Receiver Messenger Digital Transmitter Modulation Error Rate Moving Picture Experts Group Messenger Smart Receiver National Television System Committee Phase Alternation Line Quadrature Phase Shift Keying Radio Frequency Receiver Serial Digital Interface Standard Definition Messenger Link Sta2. 1 1 DATA TX RED 2 WHT 3 8 DATA BLK 9 4 nIc 5 6 H NIC 7 HK NIC 8 9 10 1 NIC 12 13 BLK 14 11 15VDC RED 15 16 USB RESET RED 17 USB DATA MHT ose BLK JK gt DC 19 USB GND 8LK RED 20 DATA ORG WHT 21 DATA WHT ORG 4 USB A 22 23 DATA 5 24 LVTTL DATA 25 NIC 26 gee A 27 LVTTL CLOCK 28 NIC 29 NIC 30 L 31 CTRL TX 32 CTRL A 33 34 NIC 35 H CLK GRN WHT 4 SHIELD wa EET WHT GRN 38 fA NOT USED WHT BLU BLU WHT Aa Q BLU WHT 1 s A HIGH SPEED 39 WHT ORG DIGITAL DATA 40 GND D oRG WHTi3 J T LVDS oro W 42 y U O GRN WHT 431 NIC 44 N C 1 FIGURE 1 30 o 16 CABLE WIRING TOLERANCES at 44 31 DIAGRAM RJE COBHAM CABLE MDT D EXTERNAL BREAKOUT FOR DO NOT SCALE DRAWING GMS Products HIGH SPEED DIGITAL DATA VERSION LINEAR ENG SIZE DATE DWG NO REV XXX 0 125 100 M0068X2A 25 OF 25
3. 10Vdc 3 GND Power ground 2 4 9 NC Not Connected 100 M0068X2A 23 of 25 www cobham com gms 9 0 Cable Losses 91 Coax Cable Cable losses must be taken into consideration if the D C is located a great distance from the receiver As mentioned above long cable runs can contribute to more resistance in the lines and also can contribute to signal attenuation because of the additional capacitance Even when using a good coax cable such as RG59 U the attenuation of the signal can be significant For example RG59 U coax will drop approximately 2dB per 100 feet at 50 MHz and 8 dB per 100 feet at 900 MHz The intermediate frequency IF in this system can fall between 49 MHz to 850 MHz An inline amplifier matching the cable losses should be considered if losses exceed 6 dB 100 M0068X2A 24 of 25 www cobham com gms APPENDIX A CABLE MDT D EXTERNAL BREAKOUT NOTES REVISIONS 1 REFERENCE BOM 780 C0269X2 FOR REFERENCE DESIGNATIONS SHOWN AS ON DRAWING AND PART DESCRIPTIONS ECO REV DESCRIPTION DATE APPROVED LABEL FINAL CABLE ASSEMBLY WITH PART NUMBER 780 C0269X2 USING BEST COMMERCIAL METHOD oss X1 INITIAL RELEASE 02122106 A LABEL CONNECTOR WITH REFERENCE DESIGNATOR AND DESCRIPTION AS SHOWN USING BEST COMMERCIAL METHOD LABEL exe X2 WIRING MODIFICATIONS FOR TTL oe TO BE WITHIN 3 0 OF CONNECTOR REFERENCE MANUFACTURING INSTRUCTION 100 10112
4. 00 in 8 26 cm x 11 43cm x 2 54cm Weight 10 69 oz 303 1 grams 7 8 Environmental Operational Temperature 10 to 70 C Humidity Up to 10076 non condensing 79 MDT D Special Features Security Option The MDT D can optionally be provided with an Advanced Encryption System AES for protecting the data in sensitive applications 100 M0068X2A 21 of 25 www cobham com gms 8 0 8 1 8 2 The D C Down Converter IF frequencies explained IF Frequencies e GMS MDRs Messenger Digital Receivers and MSRs Messenger Smart Receivers are capable of receiving direct frequencies in the range of approximately 49MHz to 86 1MHz If the transmitter is not in this range then a down converter is used to convert the frequency to this range The frequency from the down converter is called the IF intermediate frequency which is fed to the receiver Down converters have a LO local oscillator which is mixed with the transmitter frequency MDT D and converts it to the IF frequency MDRs need to know the LO local oscillator of the down converter and is factory programmed with this information MSRs also need the LO information but is not factory programmed with this information The receiver then automatically calculates the IF frequency once the RF transmitter frequency is entered Thus as the desired RF frequency is dialed in on the MDR or MSR the IF is taken care of automatically For example if the transmitter frequency
5. CLR operation and 5 perform a Query operation As a result of the Query operation the fields on the screen should all update to those values that were written during the Update operation Store All Setup Pages Button Clicking on this button will store all setup pages even if they are not shown 5 3 2 Field Definitions There are several different fields that can be configured by the MDT D Configurator The fields located in the main screen of Figure 2 and their associated values are defined in Table 2 below Also noted in the table is whether the field is read write able or both Table 2 MDT D Field Definitions Field R W Description Unit Name R W Allows the user to assign a unique unit name to the MDT Unit Number R W Allows the user to assign a unique unit number to the MDT RF Freq RF output frequency Desired frequency is entered MHz R W in MHz i e 1 296GHz would be entered as 1296 Default frequency step size is 500KHz For S2 band it s 250KHz 100 M0068X2A 11 of 25 www cobham com gms Field R W Description Modulation Modulation mode Desired modulation mode is Mode R W selected from the following values CCOFDM default Off shuts off modulation or CAL ON puts unit in calibration mode COFDM R W COFDM transmit bandwidth Desired bandwidth is Bandwidth selected from the following values 6 7 or 8 MHz COFDM Mode COFDM modulation type D
6. to section 5 3 3 2 under Configuration Special Setup Others The most significant switch SW100 represents 1000 MHz 0 9 units the second switch SW101 represents 100 MHz 0 9 units the third switch SW102 represents 10 MHz 0 9 units and the fourth switch SW103 represents 1 MHz 0 9 units Hence the highest switch selection can be 9999 MHz and the lowest is 0000 MHz For example with the switches in the following positions the frequency will read 2014 MHz Note the following If the switches are selected for a frequency outside the range of the frequency band of the MDT D the transmitter will default to the high side of the frequency band If the switches are set for a frequency higher than the transmitter frequency band It will default to the low side of the frequency band if the switches are set for a frequency lower than the transmitter frequency band 100 M0068X2A 8 of 25 www cobham com gms 5 0 Software Overview Configuration control and monitoring of the MDT D unit is accomplished by using GMS optional sold separately MS Windows based MDT D Configurator software program This Graphical User Interface GUI program provides the end user with a straightforward way to interface with the MDT D During normal operation once a MDT D link is established the MDT D Configurator GUI does not need to be active and can be disconnected from the MDT D 5 1 System Requirements The MDT D Configurator progra
7. MDT D is set for 2000MHz then the MDR can be set for 2000MHz it automatically calculates the IF frequency based on pre programmed LO information of the down converter The IF frequency changes as the RF frequency changes the LO remains constant On non GMS commercial digital receiver it may be necessary to program the receiver with the IF frequency directly The user may have to do the simple math to arrive at the IF frequency so that it can be entered into the receiver The down converter LO must be known The math involve is as follows RF transmitter frequency LO local oscillator IF frequency For example it the transmitter is set for 2000 MHz and the LO of the down converter is 2800 MHz then the IF frequency is 800 MHz 2000 2800MHz 800 The receiver will need to be set to 800 MHz to receive the transmitter frequency of 2000 MHz Each time the transmitter frequency is changed the IF must be re calculated and entered into the receiver It must also be mentioned as you may have noticed a negative LO may indicate the receiver wants the signal to be inverted See section 5 3 3 2 for inverting the signal Local and Remote Power Customers may have the option of using remote or local power to power up a down converter depending on the receiver used GMS MDRs Messenger Digital Receiver and MSRs Messenger Smart Receiver can provide DC 12 volts to power the D C remotely through the RF cables Refer to GMS MDRs or MSRs
8. Rate Guide This selection pulls up a table which displays the relationship between the Modulation mode Modulation Guard Interval and FEC mode in which the channel rate Mbps is derived Table values will change depending on which COFDM Bandwidth is selected See figure 8 Also keep in mind that all values may not be available they are MDT D configuration type dependant gt FW version This selection pulls up a window that displays the MDT D Software Version date the FPGA Version and Serial Number See Figure 9 gt About This selection pulls up a window that displays the Version Number of the GMS MDT D Configurator program 015 Modulation Guard 1 32 1 16 1 8 144 Mode QPSK QPSK QPSK 0481 8 782 8 2941 7 464 9 757 74647 10 245 QPSK 053 7 QPSK 6 16 11 7093 11 0588 9 9520 16QAM 5 4 16QAM 2 16QAM 20 1069 19 5155 18 4313 16 5882 16QAM 64QAM 64QAM 64QAM 64QAM 56 30 1604 29 2733 27 647 24 8823 9764 6352 4647 2941 10 5561 7088 9529 9294 5882 4176 9294 9058 3941 5 6 3 3 64QAM Figure 8 Channel Rate Guide 100 M0068X2A 17 of 25 www cobham com gms x Software Version 17 FPGA Version Figure 9 FW Version 6 0 Getting Started The standard MDT D kit includes the following items gt MDT D unit example GMS p n MDT DCBAONXXX gt MDT D full breakout cable GMS p n 780 C0269 Power Data Control interfaces NO
9. TE Based on customer application GMS may deliver additional cables and antennas Contact GMS for further information The MDT D is pre configured by GMS prior to shipment based on customer requirements thus is ready to work right out of the box 6 1 Initial Checkout Prior to installing a MDT D unit into the desired target environment an initial checkout should be performed to ensure proper operation of the unit The initial checkout consists of configuring a basic MDL Messenger Digital Link Figure 12A shows a basic interconnection configuration to establish a wireless MDL link NOTE Receivers down converters D C units and their associated hardware are sold separately MDT D stand alone units require the use of GMS breakout cable to provide power and the necessary interfacing to communicate to the transmitter The steps necessary to set up the configuration shown in Figure 10A are shown below 100 M0068X2A 18 of 25 www cobham com gms ANTENNA ANTENNA POWER SUPPLY BDC RECEIVER TRANSMITTER MSR Ol e gt DATA 2 7 chock 5 gt DATA 20 Chock DB9 CONNECTOR SLOT 1 RD EP DB9 MEI DATA 4 FROM DOP CLOCK 3 CLOCK 2 1 LVDS CONNECTIONS Figure 10A Basic SDML Setup 1 Install omni directional antennas onto the MDT D RF output port and Down Conv
10. User s Manual The most important thing we build is trust Messenger Digital Transmitter D MDT D Cobham Surveillance GMS Products 1916 Palomar Oaks Way Ste 100 Carlsbad CA 92008 100 M0068X2A T 760 496 0055 04 16 10 F 760 496 0057 Table of Contents 10 ACRONYMS c ae 4 20 5 2 1 Key Syst m FedtHl8s oaconfioni pos quieren iins Rn nae rate bem t Nate arrive 5 THEORY OFOPERA TION 5 HARDWARE OVERVIEW a dap 6 MDD onas a a en 6 MDT D or eroe M EUER 6 aA NINE dero i RR 6 TO cr treme 6 41 2 Frequency Select Switches esses 8 SOFTWARE OVERVIEW 9 System rua 9 eos 9 As 5 dieat ios 9 rcd inodo i 11 5 3 2 Field Definitions NR SEE EORR 11 53 3 Pull Dow
11. cal information related to the overall system Also refer to model identifier on line document 100 MNIOO41 at GMS website www cobham com gms for available frequency and power configurations along with available options 2 1 Key System Features e Coded Orthogonal Frequency Division Multiplexed COFDM Modulation e Output Frequency 360 MHz to 6 GHz In Bands e Low Power Consumption e Local and Remote Control Interfaces e Rugged and Compact Portable Design 3 0 Theory of Operation The MDT D transmitter with high speed digital data option accepts LVTTL or LVDS digital data which is clocked out via a programmable clock from the transmitter This continuous clock can be set to use LVTTL or LDVS output interface The transmitter automatically encapsulates the generic data into a DVB compliant MPEG 2 Transport Streams TSs along with time tags that are used to recover both the data and the input data timing This system is not sensitive to data structure The stream can be scrambled with an AES scrambling algorithm option sold separately to provide protection in sensitive applications prior to the final step of DVB T compliant FEC coding and COFDM Modulation Data rates from 100 Kbps to 30 Mbps can be supported However the system is optimized for high rate transmission above 5 Mbps The transmitter is compatible with GMS MSR receiver which outputs the recovered MEG2 stream to its optional Digital Data Processing Card DDPC The DDPC acc
12. component 11 Blue component when used with Component Video 12 GND GND for Pb component 13 GND GND 14 11 15Vdc Input power to unit 15 Not connected 16 USB power Reset 15V 17 USBData 18 USB Data 19 USB Gnd 20 Digital Data High speed digital data differential 21 Digital Data High speed digital data differential or LVTTL output 22 30 Not connected 31 RS232 Control Tx 32 5232 Control Rx 33 RS232 GND 34 Not connected 35 Digital Clock High speed digital data clock differential 36 Digital Clock High speed digital data clock differential or LVTTL output 37 Audio right 38 Audio right 39 Audio right line opt Pin 39 is connected to pin 38 for audio right channel input impedance of 600 ohms balance in mic or line level 40 Audio right GND 41 Audio left 42 Audio left 43 Audio left line opt Pin 43 is connected to pin 42 for audio left channel 100 M0068X2A 7 of 25 www cobham com gms input impedance of 600 ohms balance in mic or line level 44 Audio left GND 4 1 2 Frequency Select Switches There are four external rotary switches mounted into the chassis of the MDT D see Figure 1 amp 2 They are used to control RF frequency selection manually Frequency selection can also be controlled through GMS control software see section 5 The rotary switches can be disable or enable using GMS control software refer
13. e MDT D Configurator program provides the user access to many different configuration control and monitoring options When the MDT D Configurator program is launched the screen shown in Figure 4 is displayed The user should first select the serial port their computer is connected to via the Serial Port Selector and Status region If the selected serial port is valid the gray colored status box will show Ready To configure a MDT D select the MDT D box in the Device Selector region Once the MDT D box is selected the screen shown in Figure 3 is displayed The MDT D Configurator program contains function buttons and all the configurable settings available on a MDT D The following sections explain in detail the various options 100 M0068X2A 9 of 25 www cobham com gms Amor configurations File AGMS_MDT D P N 630 SWO035X1 Oj x File Configuration Help Unit Name M ams HDMT 00001 GRAS Unit Number V 040001 CLOGAL MC IOWAVE SYSTEMS Ary RF Freq MHz 1800 HS Clock Polarity Jv Falling edge Modulation Mode COFDM HS Clock Delay Gan 1000 30000000 8000000 COFDM Mode v Modu Guard Interval v A Modulation FEC Channel Rate Mbps 7088 Enable All Query Update CLA d Store All Setup Pages Figure 3 MDT D Configurator Main Screen 100 M0068X2A 10 of 25 www cobham com gms 5 3 1 Funct
14. em allows the frequency to be changed when the switches are moved Factory default enables the switches Keep in mind that you must click on the Store All Setup Pages button for any new selection to take place Ctrl Port Baud Rate The control port baud rate menu allows different baud rates to be selected when attached to the PC RS232 port 115200 baud rate is the default value Some computers may need the baud rate adjusted for optimal communications gt Factory Setup reserved for factory use and is password protected Transmitter Scrambling Setup x Scenbing Mode Query Apply Exit Status 100 M0068X2A Figure 4A Scambling Mode Setup 14 of 25 www cobham com gms 5 Transmitter Scrambling Setup or OFF AES NEVER Store the key in the Tx AES Store the key in the Tx sws Figure 4B Scambling Mode Setup 5 Transmitter Scrambling Key Setup SE ae __tosdKeyfomFie _ SavePah m Figure 5 Scambling Mode Key Setup 100 M0068X2A 15 of 25 www cobham com gms 0 Setup Update Figure 6 HS TS SETUP 0 Special Setup Figure 7 Others 100 M0068X2A 16 of 25 www cobham com gms 5 3 3 3 Help This pull down menu contains information about the MDT D firmware and the MDT D Configurator software This information is outlined below gt Channel
15. epts the MPEG2 stream from the MSR and performs the de scrambling operation if optionally purchased recovers the generic digital data and outputs it via a data clock output interface The Rx system can also support LVTTL or LVDS interfaces as a user settable option The system provides automatic timing synchronization with the input rate into the MDT D The transmitter is microprocessor controlled Normally the transmitter is controlled either through an RS 232 or USB interface via either GMS MS Windows control SW or a simple command line interface Local Frequency control is also available via rotary switches on the side of the housing 100 M0068X2A 5 of 25 www cobham com gms 4 0 Hardware Overview The hardware for the MTD D configuration is shown below 41 MDT D OUT SMA Connector Frequency DB 44 Connector Select Switches I O and Power Figure 1 MDT D Connectors 411 MDT D Connectors 4 1 1 1 4 1 1 2 100 M0068X2A RF Output The MDT D uses a female SMA bulkhead connector for its RF Output port Note Transmitters should not be powered on without a load Doing so could cause the output PA to stop working A proper heat sink is also required 1 0 The T O connector is a male high density DB 44 It is used to provide the interface for external power digital data USB and RS 232 signals The MDT D has a separate RS232 channel labeled Control on the external breakout cable for control and monito
16. erter D C RF input port Note Transmitters should not be powered on without a load Doing so could cause the output PA to stop working A proper heat sink is also required Attach the breakout cable DB 44 end to the MDT D unit Attach an RF cable from the D C IF output port to RF in port of the receiver To prepare to power the MDT D unit attach the red and black wires from the breakout cable to 12V terminal and ground of power supply respectively NOTE The power supply for the transmitter needs to be able to provide at least 1 Amp of current at a nominal 12VDC input Apply power to the MDT D and the receiver unit Also ensure the down converter is powered 12 Vdc to pin 1 GND to pin 3 of the DB 9 pin connector located on the bottom side of the D C If the down converter is installed in an enclosure it will have a power switch on the side of the unit Ensure the switch is turned to the position The BDC can be optionally powered thru the coax cable from the MSR receiver See the MSR manual 100 0061 5 After approximately 10 seconds the link should be established Using the MSR Control software monitor the appropriate RF channel If the link is established the MSR will display the locked condition See the MSR manual 100 M0061 for Setup The initial checkout described above is simply to check the basic operation of the MDT D unit For further details on monitoring and controlling the MDT D using GMS optional MS Wind
17. esired COFDM R W modulation type is selected from the following values QPSK 16 QAM or 64 OAM Mod Guard Modulation guard interval size Desired modulation Interval R W guard interval size is selected from the following values 1 32 1 16 1 8 or Modulation Modulation FEC Forward Error Correction rate FEC R W Desired modulation FEC rate is selected from the following values gt 2 3 74 5 6 7 8 Channel Rate Channel rate is displayed based on parameters Mbps R selected such as COFDM mode FEC and Guard Interval HS Clock Choice between sampling the data on the rising or Polarity R W falling edge of the clock HS Clock R W Delay from clock edge to actual data sample Delay HS Serial Bit R W Digital data rate in Mbits Sec Data rates are from Rate 100Kbits Sec to 30Mbits Sec 5 3 3 Pull Down Menu Definitions There are several different pull down menus that are included in the MDT D Configurator program Each of these pull down menus contains further user configurable options or commands The following sections describe these menus in detail 5 3 3 1 File This pull down menu offers to exit the MDT D Configurator program Alternatively the X box in the upper right hand corner of the window can be used to exit the program The Store All Setup Pages button on the main menu will save all parameters 5 3 3 2 Configuration This pull down menu contains several different configuration options These are outl
18. est pattern to be to be transmitted instead of the digital data supplied at the transmitters input Use the pull down menu and select enable then press update for this feature to be turned on The DDPC at the MSR must also be enabled See DDPC manual 100 0070 The pattern will be seen at the output of the DDPC card The pattern will be a re cycling 8 bit counter o Others This menu displays the following see Figure 7 RF Output Attenuation 0 5 dB The RF output can be attenuated in 1 dB increments up to 5 dB COFDM Spectrum Inversion choices include normal or inverted The transmitter is configured with the receiver it ships with and the inversion mode shouldn t have to be changed However if a different receiver is used the inversion mode may have to be changed Some receivers will accept either inversion mode Check the parameters of the receivers to ensure the correct inversion mode is selected Sleep Mode Can be used to put transmitter in a sleep mode a low power mode where the encoder functions and many of the power regulators are shut down enabling a saving in current approx 40 when transmitter is not active Frequency switch Choices offered are enabled or disabled These are the four frequency select switches discussed under section 5 1 2 If disabled the switches will not respond to changes frequency changes could still be accomplish by changing the RF FREQ MHZ field in the GMS MDT D control software Enabling th
19. ined below gt Special Setup o Scrambling Mode Option This pull down menu displays the following see Figure 4A amp 4B OFF Scrambling Encryption turned off disabled AES Never Store the key the TX Scrambling is turned on Enabled When scrambling is turned on a key code a series of 32 Hex characters must be entered Entering the key 100 M0068X2A 12 of 25 www cobham com gms 100 M0068X2A code is discussed in the following section Scrambling Key In this mode the key code is not stored in the transmitters memory When power is removed the key code will be lost and must be re entered when power is re applied The same key code must be entered in the DDPC of the MSR See DDPC manual 100 M0070 AES Store the key in the Tx Scrambling is turned on Enabled In this mode the key is stored in the transmitters memory When power is removed the key code will not be lost Query Clicking this button performs a read operation which will read back the current scrambling mode configuration Apply Clicking this button will perform a write operation of the selected mode NOTE When the Scrambling Mode is changed a popup window will appear informing you that the transmitter will be rebooted Exit Exit the scrambling mode o Scrambling Key Option This menu displays the following see Figure 5 Enter Scrambling Key from Keyboard The 32 character key code can be manually entered f
20. ion Buttons e Enable All Button Clicking on this button enables all the check boxes on the screen This operation is done to prepare all the fields to be written to or read from Alternatively the end user can individually select a given field by using the mouse and clicking its corresponding check box e Disable All Button Clicking on this button disables all the check boxes on the screen This operation is done to inhibit all the fields to be written to or read from Alternatively the end user can individually deselect a given field by using the mouse and clicking its corresponding check box e Query Button Clicking on this button performs a read operation on all the fields that have their check box enabled Once clicked all the selected fields will be read back reflecting their current configuration e Update Button Clicking on this button performs a write operation on all the fields that have their check box enabled Once clicked all the selected fields will be written to with the value denoted in their respective field CLR Button Clicking on this button clears out all fields on the screen regardless of whether the fields check boxes are selected or not This button proves useful when the end user wants to verify that a write operation has been correctly performed An example scenario would be to 1 enable all fields 2 change desired field s 3 perform a Update write operation 4 perform a
21. le In addition a Data RS232 channel under development will be dedicated for low rate data to be transmitted along with the audio and video 73 COFDM RF Output Output Frequency 0 36 to 6 GHz In Bands Frequency step size is 500 KHz for all bands except S2 1999 2500 MHz which is 250 KHz Bandwidth Selectable 6 7 or 8 MHz Output Power Up to100 mW programmable 200 mW on some models 20 of 25 100 M0068X2A www cobham com gms Connector SMA F Note Transmitters should not be powered on without a load Doing so could cause the output PA to stop working A proper heat sink is also required 74 Modulation Modulation Type COFDM w OPSK 16 QAM FEC gt 2 3 34 7 8 Guard Intervals 1 32 1 16 1 8 4 Spurious 50dBc Number of C OFDM Carriers 2k C OFDM MER gt 45dB Standard DVB T compliant 75 Data Port Interface Serial Data Clock Interface Continuous Interface Type LVTTL or LVDS Programmable Clock Output from Tx Programmable Clock Range 100 KHz to 30 MHz Clock Resolution 1 Hz Clock Accuracy 10 ppm Data Sampling On rising or falling edge of the clock Programmable Connector p o DB 44 female 76 Power MDT D Frequency 0 36 to 6GHz In Bands DC Input Voltage Range 9 to 15 VDC Power Consumption 8 5 Watts to 10 8watts MDT D configuration type dependent 7 Physical Dimensions without mating connectors MDT D Frequency 0 36 to 6GHz In Bands MDT D unit Size 325 W x 4 5 in D x 1
22. m has been developed and tested on Windows 2000 Windows XP and Windows NT Although the MDT D Configurator program may work properly on other operating systems only the Windows 2000 Windows XP and Windows NT environments have been used at GMS and no support or assistance can be provided concerning other operating systems 52 Installation The following instructions outline the installation process for the MDT D Configurator program 1 Insert provided CD ROM into computer 2 Click on setup exe file This will launch the GMS_MDT D Configurator Setup program and several initial setup files will begin to be copied onto the computer 3 After the initial setup files are copied over the GMS_MDT D Configurator Setup program will prompt the user to close any applications that are running Once all other programs are exited click on the OK button 4 The GMS MDT D Setup program will prompt the user to click on the computer icon button to begin installation If desired the user can change the destination directory from the default Click on the computer icon button 5 The GMS_MDT D Setup program will then prompt the user to Choose Program Group If desired the user can change the program group from the default Click on the Continue button 6 After installing the MDT D Configurator program it will display a window indicating that setup was completed successfully Click OK 53 MDT D Configurator Functions Th
23. n Menu aseo eii NUES ENGINE DH EUR RUNE eae 12 e a a e a Crm 12 Sod umi fure dun aei D AUR ree Y 12 SUN f HH 17 GETTING STARTED E 18 Bu mitad SECEOUE 18 SPEEIHIEATIONS 20 T4 Transport SiS 20 L2 RS 232 a tat 20 COFDMRF UU 20 7 4 UD GERI eg aera eat ian 21 a Data emei EA 21 EL em 2 7 7 Physical Dimensions without mating connectors 21 78 uiam oad 21 L9 Special iP na ime nd cit d diuidit it 21 8 0 THE D C DOWN CONVERTER IF FREQUENCIES EXPLAINED 22 B IF ase 22 a OE CD OL Be ETC On 22 8 2 Local and Remote nri dst e odisti onini aid 22 SU CABLEDOSSES eta em ee usu a CEA e aU CUR eM RE qu 23 ONES Or cepe 23 100 M0068X2A 2 of 25 www cobham com gms List of Tables Table 1 I O DB 44 C
24. ndard Definition Messenger Transmitter Signal to Noise Ratio Total Harmonic Distortion Transmitter Volts Direct Current 4 of 25 www cobham com gms 2 0 Introduction GMS Messenger Digital Transmitter MDT D with high speed digital data option is one of the smallest and lowest power consumption DVD T Digital Video Broadcasting Terrestrial compliant COFDM Coded Orthogonal Frequency Division Multiplexed transmitters available The MDT D will transmit any digital data stream through a COFDM link The input interface can be LVTTL Low Voltage TTL or LVDS Low Voltage Differential Signaling Additionally GMS offers a wide variety of companion products required to form a complete link A Messenger Digital Link MDL is formed when the MDT D model is combined with one of GMS Messenger Digital Receivers MSR with a Digital Data Processor Card DDPC installed one or more external Down Converters and antennas The MDT D accepts high speed digital data The data is presented at the output of the MSR via the DDPC at the same rate and sequence as was received by the transmitter The MDL uses COFDM digital modulation which is very robust provides frequency diversity and powerful Forward Error Correction FEC algorithms The MDL provides a robust wireless link that is effective against the multi path interference experienced by analog systems This manual provides information on how to operate the MDT D model as well as pertinent techni
25. onnector Pin ccsssessssssssssssssussssecsssescsscsssscssssssusessscasssessuessssessssessusssssssessssscesssenseess 7 Table 2 MDT D Field Definitions ecsesscsseccsccsscsssscccssscsssseccssccersssecsssescsssessuscessuscessueessssccerseecssscessaseessuecssneseesees 11 Table 3 DB 9 Connector Pin Out for the D C eccesssssssccsssccssscccsssssssesscsuscessucecssscsersecsssseessseessucecsuseessssessneceesees 23 List of Figures Figure eripiat rein rio iiin sertum neret cob dv oar 6 Figure 2 MDT D Configurator Main Screen 10 Figure 3 MDT D Configurator Main 5 10 Figure Scambling 5 PRIM ERR 14 Figure 4B Scambling Mode Sebtipisuineaneaistedisiimatuna avais 15 Figure 5 Scambling Mode Key 15 Figure 6 HS IS 16 RS i 16 Figure amp Charinel Rate niae tiom amidaste ai da trepidos lus br breite di inito t ien 17 Figure 9 FW oa aite Dritte f ctn retra Ub feed a epe enn 18 Figure 10A Basic SDML y mre 19 Figure Basic SDML Setup w Hi Power Transmitter 20 Figure BDC CODDIBEDDES ssa iri d idit bidon utar us cd n aina dd a d 23 Appendix Appendix A Cable MDT D External
26. operating instructions for turning on the DC power for the D C when using remote power If the D C is located relatively close to the receiver then using remote power makes sense However if the D C is located at great distances away from the receiver there may be excessive DC voltage drop in the coax cable due to cable resistances If this is the case then local DC power should be considered as discussed below If unsure of the DC voltage drop measure the DC voltage present using a DMM at the end of the coax cable run The D C normal operating voltage is approximately 12Vdc but can operate down to 10 Vdc Local power is provided by applying 12 Vdc to pin 1 GND to pin 3 of the DB 9 connector located on the bottom of the D C The 12 Volt power supply must be able to source at least 500mA The power switch located on the side of the D C enables the user to control the ON OFF positions for local 100 M0068X2A 22 of 25 power If using local power then ensure the remote power if the receivers have this capability is turned off See figure 11 Power Switch E for local 1 emp 7a lt gt RF N type connector BNC connector IF frequency DB 9 connector for local Figure 11 BDC Connectors Table 3 DB 9 Connector Pin Out for the D C Pin Signal Notes 1 412Vdc Power supply must be able to source at least 500mA Voltage should not drop below
27. ows based MDT D Configurator software program see Section 6 0 Figure 10B shows a diagram of an MDL link using a High power transmitter 100 M0068X2A 19 of 25 www cobham com gms INITIAL RELEASE ANTENNA ANTENNA 1 RECEIVER MSR TRANSMITTER HI POWER 0 fo DATA TIL e gt CLOCK TTL 4 mia DATA LVDS 2 clock Lvps DB9 CONNECTOR DB9 Ts SLOT 1 DDP 780 CO219X1 CARD DATA From pop DATA CARD CLOCK CLOCK GND 780 00217 2 DATA CONTROL POWER IN USB RS232 12 OR 28 VDC LVDS CONNECTIONS m 780 0264 2 DATA 2 SPEED DATA x DB9 GND 1 DATA 2 3 CLOCK 4 aoc 5 LVDS OR 5422 780 C0264X2 CONNECTIONS EE HI SPEED DATA SYSTEM Figure 10 Basic SDML Setup w Hi Power Transmitter 7 0 Specifications The following sections outline the overall specifications for the MDT D unit 7 1 Transport Stream Standard per ISO IEC 13818 1 Packet Size 188 byte Bit Rate Automatically set from active service settings 7 2 RS 232 Interfaces RCU USB Control Port 3 wire interface Tx Rx Gnd USB 1 0 RCU A remote portable control unit is also availab
28. ring the unit GMS MDT D Configurator software program as explained in section 5 makes use of the RS232 control lines The RS 232 channel utilizes a 3 wire configuration The pin out for the I O connector is shown in Table 1 NOTE An additional RS232 channel labeled USER DATA is currently provided with the external breakout cable for future update capabilities which are currently under development The USER Data RS232 channel will be dedicated for low rate data to be transmitted along with the audio and video The USB connector is an alternate method of interfacing to the PC if DB 9 connectors are not available 6 of 25 www cobham com gms Table 1 I O DB 44 Connector Pin Out Pin Signal Notes 1 RS232 USER Data Tx Under development 2 RS232 USER Data Rx Under development 3 RS232 GND Under development 4 Not connected 5 SDA 72 C bus 6 SCL 72 C bus 7 CVBS Y Dual use input 1 Composite video in 2 Luminance in when used with S or Component Video Must be selected with GMS Control Software or through the front panel of the in line camera mount box 8 GND GND for composite video 9 C Pr Dual use input 1 Chroma video when used with S video 2 Pr red component when used with Component Video Must be selected with GMS Control Software or through the front panel of the in line camera mount box 10 GND GND for Chroma video Pr
29. rom the keyboard The characters must be Hex numbers When the numbers have been typed use the Apply button to enter the code Load Scrambling from a file The key code can be selected from a file The browser button can be used to search thru the Directory for a file containing the key code Once a path has been established it can be saved using the Save Path button The Load Key from File is used to retrieve a key code from a file as specified by the path Use the Exit key to close this window o HSTS Setup This menu displays the following see Figure 6 HS TS Data PID This is the program ID for the data packet applied to the MPEG2 transport stream This a hex value The range of values is 0x000 The corresponding Data PID of DDPC card in the MSR must match this setting See DDPC manual 100 M0070 HS TS PCR PID This is the program ID for the PCR packet applied to thru MPEG2 transport stream This a hex value range of values is from 0x000 Ox TFFF The corresponding PCR PID of the DDPC card in the MSR must match this setting See DDPC manual 100 M0070 HS TS PCR Insert Rate This is the rate at which the Program Clock Reference PCR is sent to the receiver via MPEG2 in PCRs per second The PCR is used to synchronize the digital data transfer between the transmitter and receiver HS TS Pattern Generator The transmitter can generate a 13 of 25 www cobham com gms built in fixed digital t
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