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IRT DDC-3480, Instruction Book

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IRT DDC-3480 Instruction Book Download Page 2

3480-ddc.ib.rev8.doc 

page 2 of 20

 17/10/2007 

 

IRT Eurocard 

Type DDC-3480 

MPEG Transport Stream Adapter 

 

Instruction Book

 

 

Table of Contents 

Section Page 

 

General description 

3

 

Block diagram 

4

 

Technical specifications 

5

 

Technical description 

6

 

Internal adjustments 

7

 

Configuration 7

 

Links & options 

7

 

Installation 8

 

Operational safety 

8

 

Pre-installation 8

 

Installation in frame or chassis: 

8

 

Connections: 9

 

Front & rear panel connector diagrams 

9

 

Operation 10

 

Basic operation 

10

 

Front indicators 

10

 

Maintenance & storage 

11

 

Warranty & service 

11

 

Equipment return 

11

 

Characteristics of signal types 

12

 

Coding characteristics 

12

 

G.703 12

 

Synchronous Parallel Interface 

12

 

Asynchronous Serial Interface 

13

 

MPEG-2 transport layer coding 

14

 

Electrical characteristics 

16

 

G.703 16

 

SPI 17

 

ASI 17

 

References 18

 

Glossary of terms 

19

 

Drawing index 

20

 

 

This instruction book applies to units later than S/N 9900000. 

IRT 

Communications 

www.irtcommunications.com

Summary of Contents for DDC-3480

Page 1: ...e Internet at http www irtelectronics com I R T Electronics Pty Ltd A B N 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 9439 3744 Fax 02 9439 7439 International 61 2...

Page 2: ...Connections 9 Front rear panel connector diagrams 9 Operation 10 Basic operation 10 Front indicators 10 Maintenance storage 11 Warranty service 11 Equipment return 11 Characteristics of signal types 1...

Page 3: ...lower processing speed requirements The ASI O interface is of limited usefulness due to the specification of multimode fibre with only a short haul capability Optical transport of ASI can be better ac...

Page 4: ...MPEG2 TS formats Interleaving or de interleaving Reed Solomon insertion correction Spectrum dispersion correction Signal monitoring for remote alarm indications DDC 3470 only Block diagram DDC 3480 8B...

Page 5: ...ink 2 pin 0 1 IDC male connector Power Requirements 28 Vac CT 14 0 14 or 16 Vdc Power consumption 5 VA Other Temperature range 0 50 C ambient Mechanical Mounts in IRT FRU 1030 1 RU 19 rack chassis wit...

Page 6: ...t The G 703 output is the processed TS format The G 703 output is disabled during loss of ASI input Input Loss Alarms The Input Loss Alarm will be asserted in the absence of a valid ASI input Input TS...

Page 7: ...ry to convert from one rate to another involve changing firmware crystals and other components in addition to setting links detailed below After making these changes the whole module must be tested fo...

Page 8: ...etween signal earth and chassis earth No attempt should be made to break this connection Installation in frame or chassis The 3400 series of modules may only be mounted in IRT s FRU 1030 type 1 RU cha...

Page 9: ...t is available This is set by link LK 5 and should be set to correspond to the length of cable connected to the output This is necessary only if a shaped characteristic is required for short cable len...

Page 10: ...cted at the input for a given time MPEG 2 TS always contain a sync byte every 204 or 188 bytes irrespective of data content Therefore if 2040 or more consecutive 1 s or 0 s are been detected then the...

Page 11: ...inable 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 substitutio...

Page 12: ...ta transfer is synchronised to the Byte clock of the MPEG transport stream The data to be transmitted are MPEG 2 transport packets The data signals are synchronised to the clock depending on the trans...

Page 13: ...rial data stream The disparity characteristics of the code maintain DC balance Special characters are defined as extra code points beyond the need to encode a Byte of data One in particular is used to...

Page 14: ...e PRBS registers is initiated at the start of every eight transport packets To provide an initialisation signal for the de scrambler the MPEG 2 sync Byte of the first transport packet in a group of ei...

Page 15: ...Byte stream by the input switch Each branch is a First In First Out FIFO shift register with depth Mj cells where M 17 N I N 204 error protected frame length I 12 interleaving depth branch index The c...

Page 16: ...dB Electrical characteristics CCITT G 703 34368 Kb s Cable type Coaxial Impedance 75 Signal level 1 0 V Nominal pulse width 14 55 ns Code conversion HDB3 Pulse shape Fig 17 G 703 Jitter at input port...

Page 17: ...simplifying system design Note that the ASI signal is polarity sensitive Although most 270 Mb s SDI DA s and switchers will pass ASI signals the line drivers used usually have both inverted and non i...

Page 18: ...11 12 GHz satellite services ETS 300 429 Digital broadcasting systems for Television sound and data services framing structure channel coding and modulation for cable systems ETS 300 473 Digital broad...

Page 19: ...U CCITT recommendation G 703 HDB3 High Density Bi polar of order 3 IF Intermediate Frequency IRD Integrated Receiver Decoder ITU International Telecommunications Union LSB Least Significant Bit LVDS L...

Page 20: ...17 10 2007 Drawing index Drawing Sheet Description 804154 1 DDC 3480 45 ASI to G 703 circuit schematic 804154 2 DDC 3480 8 ASI to G 703 circuit schematic I R T C o m m u n i c a t i o n s w w w i r t...

Page 21: ...5 58 60 64 85 18 41 28 38 101 79 44 45 46 47 87 89 97 94 169 167 83 39 30 25 17 EPF10K10QC208 DDC 3480 TO G703 CONVERTER 34 or 45 9 1 2 3 4 5 6 10 1 3 4 2 8 7 5 EPC1441 DCLK ConfDone nConf nStatus DAT...

Page 22: ...0 TO G703 CONVERTER 9 1 2 3 4 5 6 10 1 3 4 2 8 7 5 EPC1441 DCLK ConfDone nConf nStatus DATA0 mSel0 mSel1 nCE 2 B1 155 105 52 156 U9 PART J7 U11 B1 108 107 154 RNEG RCLK 15 17 16 8 U17A 1 2 3 U17A 5 4...

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