MDR-3670 User Manual (Revision 05)
Contents
1. _ swi RS ERR Reed Solomon 204 to 188 NEALE De I ASI gt A Decode eScrambie Conversion Sl Output SI sw2 sw3 Swa4 2 Compatible Mode The MDR 3670 is part of a family of data transcoders for converting between the commonly used MPEG2 Transport Stream formats in the broadcast industry for video distribution The MDR 3670 operates with either an E3 34 368 Mb s or DS3 44 736 Mb s G 703 rates There are several industry modes of encoding that can be decoded by the MDR 3670 They are loosely classified as follows Standard IRT MDT 3570 DDC 3480 Upstream Similar to above Downstream Packet stuffed Compatible Legacy Framing firmware version MDR3670i1B 9 bit decoding IRT MFC 3485 firmware versions MDR3670i1C amp MDR3670i1D This range covers most other manufacturer s equipment Front panel switches allow Reed Solomon correction and or the removal of interleaving and scrambling energy dispersal On board switches allow 204 to 188 conversion after decoding The MDR 3670 is fabricated in IRT s standard Eurocard format and may be housed in a variety of IRT s frames Standard features Wide Range of G 703 to ASI conversions E3 or DS3 operation with automatic DS3 De framing Reed Solomon correction De interleaving De scrambling Packet length indication IRT Electronics Pty Ltd www irtelectronics com Page 4 of 13 Revision 05 TECHNICAL SPECIFIC2. 2 to be N O or N C to ground LK5 gt GND 1 A N C e ___ _O Relay 1 energised B N O MAJOR 2 a o LK6 MINOR 3 Relay 2 A N C O N1 4 energised B A N O O N2 5 The Major Alarm condition is Loss of Sync The Minor Alarm condition is RS Errors N1 not connected N2 not connected IRT Electronics Pty Ltd www irtelectronics com Page 8 of 13 Revision 05 MDR 3670 Front amp rear panel connector diagrams Q MDR 3670 IRT INPUT E INPUT 188 3 q y e SYNC 204 R S 0 SCRAM FRAMES R S y ASI OUTPUT SCRAM SOLOMON INTER DS UP DECODE 6 703 DOWN OFF OUTPUT Dc O BD MD A 94V 0 E225430 KB 04 IRT Electronics Pty Ltd www irtelectronics com Page 9 of 13 Revision 05 MDR 3670 OPERATION The MDR 3670 operates in a G 703 to ASI decode mode The three front panel switches determine the decoding operations performed Not all combinations of decoding are valid or optimal for use with MPEG2 transport streams The user must be aware of the intended application and the Transport Stream format used Switches in the UP position apply decoding and switches in the DOWN position bypass decoding The application of certain processing functions is automatically blocked if the incoming stream is not in a suitable format e g if the incoming Transport Stream contains 188 Byte packets then neither De Interleaving nor Reed Solomon Decoding
3. SW4 30N Payload data is evenly distributed continuous in ASI output f w version MDR3670i1B SW4 3 OFF Payload data in each packet is contiguous burst in ASI output f w version MDR3670i1B SW4 3 not used firmware version MDR3670i1C SW4 30N Payload data is evenly distributed continuous in ASI output f w version MDR3670i1D SW4 3 OFF Payload data in each packet is contiguous burst in ASI output f w version MDR3670i1D SW4 40N TEI bit Transport Error Indicator set in outgoing stream if an uncorrectible error is detected SW4 4 OFF TEI bit Transport Error Indicator in outgoing stream is unchanged SW4 50N _ R Sled shows both correctible and uncorrectible errors SW4 5 OFF R S led shows uncorrectible errors only SW4 6 not used SW4 7 not used firmware versions MDR3670i1B MDR3670i1C SW4 7ON ASI output continues for several hundredths of a ms after loss of G 703 input firmware version MDR3670i1D SW4 7 OFF Normal ASI output behaviour on loss of G 703 input firmware version MDR3670i1D SW4 80N Receiver equaliser G 703 disabled SW4 8 OFF Receiver equaliser G 703 enabled NOTE 1 ASI output payload data is only contiguous burst with firmware version MDR3670i1C 2 TEI b7 of byte after sync byte 3 This ensures that a downstream DDA 3310 will see a loss of ASI and switch even for rates down to 1 2Mb s firmware version MDR3670i1D IRT Electronics Pty Ltd www ir
4. and de interleaving Certain combinations of functions are inhibited e g de interleaving of a 188 byte transport stream The processing functions are selected using three switches de scrambling RS decoding and de interleaving on the front panel Each switch has two positions up or down A switch set to the UP position enables the decoding section A switch set to the DOWN position bypasses the decoding section ASI Output ASI operates at 270 Mb s and uses 8B 10B coding with K28 5 stuffing bytes The ASI cable output uses a 75 Ohm BNC connector An ASI optical link can be used to transport the ASI C signal via fibre optic cable See IRT Fibre link brochures or manuals for further information Alarm relays Major Alarm Loss of Sync and Minor Alarm RS Errors relay contacts are available on PL4 of the rear assembly N O or N C contacts to ground are selected by link settings LK5 and LK6 LED indicators LED indicators 188 TS Byte length 204 TS Byte length RS error Scram present RS present are blanked during Input loss or sync loss IRT Electronics Pty Ltd www irtelectronics com Page 6 of 13 Revision 05 MDR 3670 CONFIGURATION Link settings Warning Links may be changed without disconnecting power However when any link is changed normal decoding of the MPEG TS will be disturbed The time taken before normal decoding resumes is dependent on the decoder in use and may be up to five seconds LK1 IN
5. equipment is within the warranty period or not Contact IRT for current hourly rate NODWN Please note that all freight charges are the responsibility of the customer The equipment should be returned to the agent who originally supplied the equipment or where this is not possible to IRT directly Details of IRT s direct address can be found at IRT Electronics website Web address www irtelectronics com Email sales irtelectronics com IRT Electronics Pty Ltd www irtelectronics com Page 12 of 13 Revision 05 MDR 3670 APPENDIX A CHARACTERISTICS OF SIGNAL TYPES Coding characteristics G 703 The HDB3 High Density Bi polar of order 3 code as defined in G 703 for 34 368 kb s is as follows Binary 1 bits are represented by alternate positive and negative pulses and binary O bits by spaces Exceptions are made when strings of successive O bits occur in the binary signal Each block of 4 successive zeros is replaced by OOOV or BOOV where B is an inserted pulse of the correct polarity and V is an inserted pulse violating the polarity rule The choice of OOOV or BOOV is made so that the number of B pulses between consecutive V pulses is odd so that successive V pulses are of alternate polarity and so no DC component is introduced The B3ZS Bipolar with Three Zero Substitution also designated HDB2 High Density Bi polar of order 2 code as defined in G 703 for 44 736 kb s is as follows Binary 1 bits are represented by a
6. of first delivery unless contrary conditions apply under a particular contract of supply For situations when No Fault Found for repairs a minimum charge of 1 hour s labour at IRT s current labour charge rate will apply whether the equipment is within the warranty period or not Equipment warranty is limited to faults attributable to defects in original design or manufacture Warranty on components shall be extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced and not in associated equipment If possible confirm this by substitution Before returning equipment contact should be made with IRT or your local agent to determine whether the equipment can be serviced in the field or should be returned for repair The equipment should be properly packed for return observing antistatic procedures The following information should accompany the unit to be returned A fault report should be included indicating the nature of the fault The operating conditions under which the fault initially occurred Any additional information which may be of assistance in fault location and remedy A contact name and telephone and fax numbers Details of payment method for items not covered by warranty Full return address For situations when No Fault Found for repairs a minimum charge of 1 hour s labour will apply whether the
7. ATIONS Inputs Type G 703 Rate Outputs Type Mode Alarms Major Minor Power Requirements Voltage Power consumption Other Temperature range Mechanical Finish Front panel Rear assembly Dimensions Supplied accessories MDR 3670 1xG 703 750 BNC connector E3 34 368 Mb s or DS3 44 736 Mb s link selectable 1 x ASI C 750 800 mVp p BNC connector Continuous or Burst DIP switch settable firmware versions MDR3670i1B MDR3670i1D Burst firmware version MDR3670i1C Relay NO NC link selectable Relay energised when Input Sync is obtained Relay NO NC link selectable Relay energised when there are no Reed Solomon Errors 28 Vac CT 14 0 14 or 16 Vdc lt 5 5 VA 0 50 C ambient Suitable for mounting in IRT 19 rack chassis with input output and power connections on the rear panel Grey background black lettering amp red IRT logo Detachable silk screened PCB with direct mount connectors to Eurocard and external signals 6 HP x 3 Ux 220 mm IRT Eurocard Rear connector assembly including matching connector for alarm output Due to our policy of continuing development these specifications are subject to change without notice IRT Electronics Pty Ltd www irtelectronics com Page 5 of 13 Revision 05 MDR 3670 TECHNICAL DESCRIPTION The MDR 3670 converts an appropriate G 703 input to an ASI C signal This module is capable of performing de scrambling RS decoding
8. SUS MDR 3670 Thee ELECTRONICS User Manual IRT Electronics Pty Ltd www irtelectronics com Revision 05 G 703 TO ASI NETWORK INTERFACE ADAPTER Revision History MDR 3670 Revision Date By Change Description Applicable to 00 19 11 2004 AL Original Issue Firmware version gt MDR3670i1B 22 11 2004 01 05 11 2009 AL Special Rate dropped now compatible with older MFC 3485 Firmware version gt MDR3670i1C 11 12 2009 02 14 07 2010 AL Rev O and Rev 1 handbooks combined to reflect differences in firmware versions ASI output mode burst or continuous added Firmware versions MDR3670i1B 22 11 2004 or MDR3670i1C 11 12 2009 03 11 10 2010 AL Firmware version MDR3670i1D DIP switch settings SW4 3 and SW4 7 added Firmware versions MDR3670i1B 22 11 2004 MDR3670i1C 11 12 2009 or MDR3670i1D 15 09 2010 04 24 01 2012 AL SW4 3 DIP switch setting corrected for firmware 1D version Firmware versions MDR3670i1B 22 11 2004 MDR3670i1C 11 12 2009 or MDR3670i1D 15 09 2010 05 24 05 2012 AL Reformatted layout Firmware versions MDR3670i1B 22 11 2004 MDR3670i1C 11 12 2009 or MDR3670i1D 15 09 2010 IRT Electronics Pty Ltd www irtelectronics com Page 2 of 13 Revision 05 MDR 3670 USER MANUAL Table of Contents Section Page Revision History 2 Operational Safety 3 Gener
9. al Description 4 Technical Specifications 5 Technical Description 6 Configuration 7 Installation 8 Front and rear layouts 9 Operation 10 Front panel indicators 10 Processing controls 11 Maintenance amp Storage 12 Warranty amp Service 12 Equipment return 12 Characteristics of Signal Types 13 Coding characteristics 13 G 703 13 This instruction book applies to units programmed with firmware version MDR3670i1B MDR3670i1C or MDR3670i1D OPERATIONAL SAFETY WARNING Operation of electronic equipment involves the use of voltages and currents that may be dangerous to human life Note that under certain conditions dangerous potentials may exist in some circuits when power controls are in the OFF position Maintenance personnel should observe all safety regulations Do not make any adjustments inside equipment with power ON unless proper precautions are observed All internal adjustments should only be made by suitably qualified personnel All operational adjustments are available externally without the need for removing covers or use of extender cards IRT Electronics Pty Ltd www irtelectronics com Page 3 of 13 Revision 05 MDR 3670 GENERAL DESCRIPTION BLOCK DIAGRAM MDR 3670 SIGNAL PATH SYNC LK1 E a 204 INPUT El COMP SCRAM Present DS3 v RS Present 4 Discard Clock Auto 4 e p gt TH De Interleave G 703 J Data Recovery Deframe E O _ _
10. can be applied The MDR 3670 provides a visual indication of the incoming Transport Stream format e g Packet size 188 204 Scrambling or RS coding These indicators help the user decide which processing functions are required TS Transmission Formats The application of scrambling interleaving and RS encoding is required prior to satellite or terrestrial modulators e g QPSK modulation for satellite Interleaving and RS coding are almost always used together Interleaving reduces the impact of burst errors by redistributing the error burst over multiple packets Since the RS decoder can only correct up to 8 bytes per packet interleaving increases the likelihood of all the errors being corrected If a packet has more than 8 error bytes an RS decoder will be unable to correct that packet Scrambling or energy dispersal on the other hand eliminates long strings of 1 s or O s and hence helps maintain the DC balance of the transmitted signal Front Panel Indicators Input loss alarm This LED lights when G 703 loss of signal is detected INPUT O 138 sync O 204 Sync loss alarm R S O scram This LED lights when a valid MPEG 2 TS is absent but G 703 signal is present FRAME rs 188 byte indicator This LED lights when a valid MPEG 2 TS with 188 byte packet length is decoded 204 byte indicator This LED lights when a valid MPEG 2 TS with 204 byte packet length is decoded Scrambling presence indicator After decoding t
11. his LED lights when a valid MPEG 2 TS stream containing a byte sequence that corresponds to scrambling A scrambling byte sequence uses an inverted 47H sync byte B8H every eighth sync to signify the start of the scrambling sequence R S Reed Solomon presence indicator Green After decoding this LED lights when Reed Solomon error correction bytes are present in place of the 16 dummy bytes of a 204 Byte MPEG 2 TS The MDC 3470 considers any data content other than all 0 s during the 16 dummy bytes to be RS correction bytes R S Reed Solomon Error indicator Red Depending on the position of switch SW4E this LED lights for at least 300 ms when only un correctable R S packets are detected SW4E OFF or either uncorrectable and correctable RS packets are detected SW4E ON Uncorrectable errors correspond to packets with more than 8 bytes in error Frame indicator Green This LED lights when the input G 703 signal is of a framed format DS3 only IRT Electronics Pty Ltd www irtelectronics com Page 10 of 13 Revision 05 MDR 3670 Processing controls This module is capable of performing de scrambling RS decoding and de interleaving In this context the word scrambling refers to the process of randomisation for the purpose of energy dispersal of the signal It does not refer to the encryption applied to Pay TV signals to control access to particular channels or programs The processing functions are selected using three swi
12. lternate positive and negative pulses and binary O bits by spaces Exceptions are made when strings of successive O bits occur in the binary signal Each block of 3 successive zeros is replaced by OOV or BOV The choice of OOV or BOV is made so that the number of B pulses between consecutive V pulses is odd so that successive V pulses are of alternate polarity and so no DC component is introduced IRT Electronics Pty Ltd www irtelectronics com Page 13 of 13 Revision 05
13. selects E3 operation 34 368 Mb s OUT selects DS3 operation 44 736 Mb s LK2 IN selects compatible mode of operation for compatibility with some other manufacturer s older style of encoding firmware version MDR3670i1B OUT selects standard mode of operation firmware version MDR3670i1B LK2 IN selects 9 bit compatible mode of operation for compatibility with IRT s MFC 3485 firmware versions MDR3670i1C amp MDR3670i1D OUT selects standard mode of operation firmware versions MDR3670i1C amp MDR3670i1D LK3 not used LK4 not installed LK5 with link in position A then Major Alarm relay output is configured to be normally closed with link in position B then Major Alarm relay output is configured to be normally open LK6 with link in position A then Minor Alarm relay output is configured to be normally closed with link in position B then Minor Alarm relay output is configured to be normally open LK7 not installed Note normally open indicates with the relay energised the output looks like an open circuit to ground With no power to the board or with relay non energized the relay output is short circuit to ground Major Alarm relay energised when Input Sync obtained Minor Alarm relay energised when there are no RS errors Switch settings SW4 1 not used SW4 20N 204 to 188 byte conversion enabled SW4 2 OFF 204 to 188 byte conversion disabled
14. tches de scrambling RS decoding and de interleaving on the front panel Each switch has two positions SCRAM A switch set to the UP position applies processing to the decoding section O SOLOMON a switch set to the DOWN position does not perform that function INTER LEAVE UP DECODE DOWN OFF NOTE When being used in the 9 bit compatible mode with an MFC 3485 encoder all front panel switches must be set to the OFF position applicable to firmware versions MDR3670i1C amp MDR3670i1D IRT Electronics Pty Ltd www irtelectronics com Page 11 of 13 Revision 05 MDR 3670 MAINTENANCE amp STORAGE Maintenance No regular maintenance is required Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind This is especially important in fibre optic equipment where cleanliness of optical connections is critical to performance Storage If the equipment is not to be used for an extended period it is recommended the whole unit be placed in a sealed plastic bag to prevent dust contamination In areas of high humidity a suitably sized bag of silica gel should be included to deter corrosion Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these bags WARRANTY 8 SERVICE Equipment is covered by a limited warranty period of three years from date
15. telectronics com Page 7 of 13 Revision 05 MDR 3670 INSTALLATION Pre installation Handling This equipment may contain or be connected to static sensitive devices and proper static free handling precautions should be observed Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these bags Power AC mains supply Ensure that operating voltage of unit and local supply voltage match and that correct rating fuse is installed for local supply DC supply Ensure that the correct polarity is observed and that DC supply voltage is maintained within the operating range specified Earthing The earth path is dependent on the type of frame selected In every case particular care should be taken to ensure that the frame is connected to earth for safety reasons See frame manual for details Signal earth For safety reasons a connection is made between signal earth and chassis earth No attempt should be made to break this connection Installation in frame or chassis See details in separate manual for selected frame type Input Output amp alarm connections G 703 input and ASI output are by 750 BNC connectors on the rear assembly Alarm outputs are by a 5 pin Phoenix style screw connector on the rear assembly Alarms are by relay contacts Links LK5 and LK6 set the Major Alarm Relay 1 and the Minor Alarm Relay
Download Pdf Manuals
Related Search