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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 9439 3744
+61 2 9439 7439
Email: sales@irtelectronics.com
Web:
www.irtelectronics.com
IRT Eurocard
Type DDC-3471
SPI to SPI, ASI
MPEG Transport Stream Adapter
Designed and manufactured in Australia
IRT can be found on the Internet at:
http://www.irtelectronics.com
page 1 of 20
3471-ddc.ib.rev2.doc
17/10/2007
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Summary of Contents for IRT DDC-3471
- Page 1 +61 2 9439 7439 Email: sales@irtelectronics.com Web: www.irtelectronics.com IRT Eurocard Type DDC-3471 SPI to SPI, ASI MPEG Transport Stream Adapter Designed and manufactured in Australia IRT can be found on the Internet at: http://www.irtelectronics.com page 1 of 20 3471-ddc.ib.rev2.doc 17/10/2007...
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Page 2: Table Of Contents
IRT Eurocard Type DDC-3471 SPI to SPI, ASI MPEG Transport Stream Adapter Instruction Book Table of Contents Section Page General description Application Block diagram Technical specifications Technical description Configuration Links & options Installation Operational safety Pre-installation Installation in frame or chassis: Connections: Front &... -
Page 3: General Description
The 34XX series find particular application in CATV Headends where equipment from different manufacturers uses different formats. They may also be used for monitoring connections to test equipment. In addition, the DDC-3471 provides facilities for changing certain coding features of the MPEG transport stream to ensure compatibility between signals. -
Page 4: Application
Baseband interfacing and sync This unit adapts the data structure to the format of the signal source. This may be a DDC-3460 or simply the input interface of the DDC-3471. The framing structure is in accordance with MPEG-2 transport layer including sync Bytes. -
Page 5: Technical Specifications
Other: Temperature range 0 - 50° C ambient Mechanical Mounts in IRT FRU-1030 1 RU 19" rack chassis with input, output and power connections on the rear panel. Finish: Front panel Grey enamel, silk-screened black lettering & red IRT logo. -
Page 6: Technical Description
In most instances the DDC-3471 would be set to decoder mode with the de-interleaver and RS decoder functions enabled. To generate a FOXTEL compliant TS stream from a Rohde & Schwarz DVG, the DDC-3471 would be set with the interleaver and RS encoder enabled. -
Page 7: Configuration
Configuration Links & options: Warning: Some of the following links are for factory use only during set-up and should not be changed. 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. -
Page 8: Installation
Installation 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. -
Page 9: Connections
Connections: SPI connectors: The SPI uses 25 pin 'D' connectors. Cable connectors are male and equipment connectors are female. Interconnecting cables and connectors must be shielded. Logic levels are LVDS. Signal line Signal line Clock A Clock B System Gnd System Gnd Data 7 A(MSB) Data 7 B... -
Page 10: Operation
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 DDC-3471 considers any data content other than all 0’s during the 16 dummy bytes to be RS correction bytes. -
Page 11: Maintenance & Storage
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. -
Page 12: Characteristics Of Signal Types
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 Kbits/s is as follows: Binary 1 bits are represented by alternate positive and negative pulses and binary 0 bits by spaces. Exceptions are made when strings of successive 0 bits occur in the binary signal. -
Page 13: Asynchronous Serial Interface
Asynchronous Serial Interface (ASI) The Asynchronous Serial Interface (ASI) provides a system for serial encoded transmission of different data rates with a constant transmission rate of 270 Mbit/s. The ASI standard supports coaxial cable and multi-mode fibre-optic cable (using LED emitters). ASI Protocol Architecture Description The ASI protocol is divided into three architectural layers: Layer-0, Layer-1 and Layer-2. -
Page 14: Mpeg-2 Transport Layer Coding
MPEG-2 transport layer coding The MPEG-2 Transport Layer is defined in ISO/IEC DIS 13818-1 [1]. The Transport Layer for MPEG-2 data is comprised of packets having 188 Bytes, with one Byte for synchronisation purposes, three Bytes of header containing service identification, scrambling and control information, followed by 184 Bytes of MPEG-2 or auxiliary data. - Page 15 Convolutional interleaving Convolutional interleaving with depth I = 12 is applied to the error protected packets (see figure 2c). This results in an interleaved frame. The convolutional interleaving process is based on the Forney approach which is compatible with the Ramsey type III approach, with I = 12.
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Page 16: Electrical Characteristics
Electrical characteristics: Electrical characteristics CCITT G.703 2048 Kb/s: Pair each direction One coaxial pair. 75 Ω resistive. Test load impedance Signal level 2.37 V. Nominal pulse width 244 ns. Code conversion HDB3. Pulse shape Fig. 15/G.703. Jitter at input port §... -
Page 17: Spi
Electrical characteristics SPI: Line Driver Characteristics (Source) 100 Ω maximum Output impedance Common mode voltage 1.125 V to 1.375 V Signal amplitude 247 mV to 454 mV < T/7, measured between the 20% and 80% amplitude points, with a 100 Ω Rise and fall times resistive load. -
Page 18: References
References ANSI Standard X3T1 1/ Levels FC-1 and FC-0. DVB-PI-232 TM1449 Interfaces for CATV/SMATV Headends & similar Professional Equipment. ETS 300 421. Digital broadcasting systems for Television, sound and data services; framing structure, channel coding for 11/12 GHz satellite services. ETS 300 429. -
Page 19: Glossary Of Terms
Glossary of terms 8B/10B Eight to Ten Bit Conversion. Asynchronous Serial Interface. ASI-C ASI Coaxial cable. ASI-O ASI Fibre optic cable. B3ZS Bipolar with Three Zero Substitution. Baseband. Bit Error Rate. CCIR Comite Consultatif International des Radiocommunications. CCITT Comite Consultatif International Telephonique et Telegraphique. CPLD Custom Programmable Logic Device. -
Page 20: Drawing Index
Drawing index Drawing # Sheet # Description 804489 DDC-3471 circuit schematic 804489 DDC-3471 circuit schematic 804489 DDC-3471 circuit schematic page 20 of 20 3471-ddc.ib.rev2.doc 17/10/2007...
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