IRT MFC-3485 User Manual

Asi / g.703 network interface adaptors

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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

Types MFC-3485 & MFC-3465

ASI / G.703 Network Interface Adaptors

Designed and manufactured in Australia

IRT can be found on the Internet at:

http://www.irtelectronics.com

page 1 of 22

3465&3485-mfc.ib.rev4.doc

17/10/2007

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Page 1 +61 2 9439 7439 Email: sales@irtelectronics.com Web: www.irtelectronics.com IRT Eurocard Types MFC-3485 & MFC-3465 ASI / G.703 Network Interface Adaptors Designed and manufactured in Australia IRT can be found on the Internet at: http://www.irtelectronics.com page 1 of 22 3465&3485-mfc.ib.rev4.doc 17/10/2007...
Page 2: Table Of Contents
This instruction book applies to units later than S/N 9900000. Declaration of Conformity Both the MFC-3465 and MFC-3485 meet both C-Tick and CE standards and satisfies the essential requirements of directives 73/23/EEC and 89/336/EEC as modified by directives 93/68/EEC, 92/31/EEC and 93/97/EEC.
Page 3: General Description
General description The MFC-3485 and MFC-3465 are part of a family of data transcoders for converting between the commonly used MPEG2 Transport Stream formats in the broadcast industry for video distribution. Any ASI (Asynchronous Serial Interface) input with a payload data rate within the range of 1.5 to 39 Mb/s will be converted to a B3ZS encoded 44.736 Mb/s unformatted data stream by the MFC-3485/45.
Page 4: Block Diagram
Features: • Input rate stuffing to G.703 rates. • Modular format compatible with IRT fibre optic, distribution amplifier and switcher modules. • Suitable for Single Frequency Network (SFN) use Applications: • Conversion of variable rates of DVB ASI to G.703, and for transport via Telecom circuits.
Page 5: Technical Specifications
<5 VA. Other: Temperature range 0 - 50° C ambient. Mechanical Suitable for mounting in IRT 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 MFC-3485 and MFC-3465 form a system for encoding and decoding the data in an ASI data stream for transport in a G.703 stream. The MFC-3485 takes ASI data rates from 1.5 to 30 Mb/s and adds stuffing bytes to convert the signal to run on a 34 Mb/s (E-3) G.703 system (MFC-3485/34, 34 Mb/s version) or ASI data rates from...
Page 7 G.703 input and detects MPEG TS sync errors. G.703 Input The input G.703 signal, originally encoded by the MFC-3485, is applied to the rear panel connector and passes to the input transformer and integrated line receiver, U3. This receiver chip provides automatic line equalisation and derives ±...
Page 8: Configuration
Links: MFC-3485 LK 1: HDB3 output. Set IN for MFC-3485/34 (34 Mb/s) version only – factory set. B3ZS output. Set OUT for MFC-3485/45 (45 Mb/s) version only – factory set. LK 2: DS3 shaped output for <225 feet, MFC-3485/45 (45 Mb/s) version.
Page 9: Installation
Note: LK1 does not change unit from 34 Mb/s operation to 45 Mb/s operation or vice-versa. For the MFC-3485/45 a choice of shaped or unshaped output is available. This is set by link LK2 and should be set to correspond to the length of cable connected to the output. This is necessary only if a shaped characteristic is page 9 of 22 3465&3485-mfc.ib.rev4.doc...
Page 10: Mfc-3465
Where the connected equipment has automatic equalisation (such as IRT DA’s and converters) this is not required. LK2 IN DS3 shaped output for <225 feet, MFC-3485/45 OUT DS3 unshaped output for >225 feet, MFC-3485/45 Note: Leave out on MFC-3465/34 (34 Mb/s) version.
Page 11: Front & Rear Panel Connector Diagrams
Front & rear panel connector diagrams The following front panel and rear assembly drawings are not to scale and are intended to show relative positions of connectors, indicators and controls only. 3465 3485 MF C - 3 4 6 5 MF C - 3 4 8 5 SPI_OUT INPUT...
Page 12: Operation
Operation 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. Any change in signal will be indicated by the front panel LED’s and or alarm output as outlined below. Front indicators: Input loss alarm: INPUT...
Page 13: 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 14: 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 15: 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 16: 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 17 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 18: 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 19: 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 20: 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 21: 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 22: Drawing Index
MFC-3465 circuit schematic – G.703 to ASI converter 804382 MFC-3465 circuit schematic – G.703 to ASI converter 804384 MFC-3485 circuit schematic – ASI to SPI converter 804384 MFC-3485 circuit schematic – ASI to G.703 converter 804384 MFC-3485 circuit schematic – ASI to G.703 converter page 22 of 22 3465&3485-mfc.ib.rev4.doc...
Page 23 1 10/11/99 ECR1243 2 09/08/01...
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Page 25 1 10/6/1995 3 13/12/00 ecr1246 4 10/09/01...
Page 26 2 28/10/98 3 13/12/00 4 13/12/00...
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