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IRT DDC-3480 Instruction Book

Mpeg transport stream adapter
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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-3480
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
3480-ddc.ib.rev8.doc
17/10/2007

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Summary of Contents for IRT DDC-3480

  • Page 1 +61 2 9439 3744 +61 2 9439 7439 Email: sales@irtelectronics.com Web: www.irtelectronics.com IRT Eurocard Type DDC-3480 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 3480-ddc.ib.rev8.doc 17/10/2007...

  • Page 2: Table Of Contents

    IRT Eurocard Type DDC-3480 MPEG Transport Stream Adapter Instruction Book Table of Contents Section Page General description Block diagram Technical specifications Technical description Internal adjustments Configuration Links & options Installation Operational safety Pre-installation Installation in frame or chassis: Connections: Front & rear panel connector diagrams...

  • Page 3: General Description

    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 achieved by the use of IRT’s DVT/DVR-3210 single mode SDI/ASI fibre optic link, which has a capability of transporting ASI signals more than 50 Km.

  • Page 4: Block Diagram

    • Reed Solomon insertion & correction. * • Spectrum dispersion correction. * • Signal monitoring for remote alarm indications. DDC-3470 only. Block diagram DDC-3480 Alarms & Indications 188 BYTE BLOCK 204 BYTE BLOCK SYNC ERROR INPUT LOSS Output Input G.703...

  • 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

    The ASI cable input is via a 75 Ohm BNC connector. ASI operates at 270 Mbit/s and uses 8B/10B coding with K28.5 stuffing bytes. The DDC-3480 removes the K28.5 stuffing bytes to return a signal at the encoding data rate.

  • Page 7: Internal Adjustments

    Note: The DDC-3480 is available for different G.703 rates. The changes necessary 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 for accuracy of the G.703 output.

  • Page 8: Installation

    Installation in frame or chassis: The 3400 series of modules may only be mounted in IRT’s FRU-1030 type 1 RU chassis/PSU. This chassis may house either one or two of the cards in the series.

  • Page 9: Connections

    For the DDC-3480/34 no other adjustments are required. For the DDC-3480/45 a choice of shaped or unshaped output 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 lengths.

  • Page 10: Operation

    Operation Basic Operation: Apart from the DDC-3470 (see below), there are no operational controls for these modules. Setting up consists only of connecting the input and selected output. Once this is done the front panel indicators should react and the output should present the correct format signal.

  • 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.

  • 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 804154 DDC-3480/45 ASI to G.703 circuit schematic 804154 DDC-3480/8 ASI to G.703 circuit schematic page 20 of 20 3480-ddc.ib.rev8.doc 17/10/2007...
  • Page 21 2 13/04/00 ECR1135 3 05/10/00 ECR1168 4 03/01/01 LLOOP DECODIS SW1 A RMS A2 RMS Q2 SW1 B RMS Q1 SW2 A RMS A1 SYS RST SW2 B Vbatt /ENN...
  • Page 22 LLOOP DECODIS SW1 A RMS A2 RMS Q2 SW1 B RMS Q1 SW2 A RMS A1 SYS RST SW2 B Vbatt /ENN...

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