User Manual - IRT Communications
Contents
1. Page 14 of 14 21 01 20092. as Name Address and Location are set via an RS232 interface a D9 connector on the rear of the frame below the mains inlet A software terminal emulator such as Tera Term or HyperTerminal is used for setting and reading the parameters of the frame IRT modules that are SNMP compatible need a plug in SMU 4000 module with a program relevant to the module that it is plugged into Depending on the module besides the module identification parameters such as alarm states inputs and controls etc are communicated to the CDM xxxx agent via a data bus on the rear of the frame Thus the CDM xxxx collects information on what is loaded within the frame what positions they occupy and their current status for communication to the NMS when the NMS sends a request for information In the event of a major alarm from any of the SNMP compatible modules or power supplies a trap is automatically sent by the CDM xxxx agent to the NMS without any prompting by the NMS This alerts the operator to any fault conditions that may exist that need immediate attention Ld D FRU 4000 110 240 V 50 60 Hz FRAME 0 7 A max _ Ir RS232 Ethernet AS3260 approval no CS6346N Ass no 804692 O O IRT SNMP Connections IRT modules fitted DM with SMU 4000 e eii mr IRT SNMP Frame Ethernet Cable Ethernet Cable IRT modules fitted DM with SMU 4000 Moos IRT SNMP Frame E
3. burst errors by redistributing the error burst over multiple packets Since the RS decoder can only correct up to 8 bytes per packet this increases the likelihood of all the errors being corrected If a packet has more than 8 errored bytes an RS decoder will be unable to correct that packet Scrambling or energy dispersal on the other hand helps maintain DC balance on the transmission line and allows equiprobable detection threshold to be used Front Panel Indicators Input loss alarm This LED lights when no ASI input is detected INPUT 188 sYNC 204 Sync loss alarm R S scram This LED lights when there are 8B 10B errors in the input stream rs 188 byte indicator This LED lights when a valid MPEG 2 TS with 188 byte packet length is input 204 byte indicator This LED lights when a valid MPEG 2 TS with 204 byte packet length is input Scrambling presence indicator This 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 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 4570 considers any data content other than all 0 s or all FF s during the 16 dummy bytes to be RS correction bytes R S Reed Solomon Error indica
4. section UP DECODE CENTRE OFF In most instances the MDC 4570 would be set to all encode or all decode DOWN SENCODE 4570 mdc ib rev0 doc Page 10 of 14 21 01 2009 SNMP Functions With the MDC 4570 installed in an IRT frame with SNMP capability the unit can be interrogated by an SNMP Network Management System NMS The following SNMP functions are capable of being monitored and controlled by an NMS NOTE Alarms The current state of the Urgent Major and Non Urgent Minor Alarms Switch Status An indication of the Scramble SCRAM front panel switch setting An indication of the REED SOLOMON front panel switch setting An indication of the INTERLEAVE front panel switch setting An indication of the 188 to 204 Byte conversion DIP switch setting SW4 1 An indication of the 204 to 188 Byte conversion DIP switch setting SW4 2 Input Status An indication that an input signal is present An indication of the input signal packet size 188 or 204 Byte An indication of the approximate input data rate An indication of if the input signal has energy dispersal scrambling added An indication of if the input signal has Reed Solomon bytes RS Error Monitoring Enables Reed Solomon error monitoring An indication of the accumulated number of correctable Reed Solomon errors An indication of the accumulated number of uncorrectable Reed Solomon errors An indication of the number of sync loss periods Allows naming
5. IR T Electronics Pty Ltd A B N 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 94393744 Fax 02 9439 7439 International 61 2 9439 3744 61 2 9439 7439 Email sales irtelectronics com Web _ www irtelectronics com IRT Eurocard Type MDC 4570 ASI to ASI Network Interface Adapter Designed and manufactured in Australia IRT can be found on the Internet at http www irtelectronics com 4570 mdc ib rev0 doc Page 1 of 14 21 01 2009 IRT Eurocard Type MDC 4570 ASI to ASI Network Interface Adapter Instruction Book Table of Contents Section Page Operational Safety 2 General Description 3 Technical Specifications 4 Technical Description 5 Configuration 6 Installation 7 Front and rear layouts 8 Operation 9 Front Panel Indicators 9 Processing controls 10 SNMP Functions 11 SNMP What Is It 12 Maintenance amp Storage 14 Warranty amp Service 14 Equipment return 14 This instruction book applies to units later than S N 0901001 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 adju
6. ations of encoding and 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 CENTER position do not affect encoding or decoding switches in the UP position apply to decoding and switches in the DOWN position apply to encoding 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 Interleaving De Interleaving Reed Solomon encoding or Reed Solomon Decoding can be applied The MDC 4570 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 In most encoding applications the switches would typically be in the center or down position Whilst in most decoding applications the switches would typically be in the center or up position It would be unusual to use switch combinations where one or more switches are in the up position whilst one or more switches are in the down position 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
7. e Other information relating to the device is also stored information such as alarm states controllable settings etc The MIB tree is organised in such a way that there will be no two MIB files with conflicting placements Normally an NMS polls an agent for information relating to the MIB in a managed device to be sent back to the NMS When certain conditions are met within the MIB such as major alarm conditions for example the agent automatically sends what is known as a trap to the NMS without any prompting from the NMS This allows automatic notification of a predetermined event SNMP Block Diagram SNMP Agent Protocol Engine _ gt SNMP Agent SNMP Agent Protocol Engine _ gt SNMP Agent SNMP Agent Protocol Engine SNMP Agent 4570 mdc ib rev0 doc Page 12 of 14 21 01 2009 SNMP with IRT Products IRT Electronics currently employs SNMPv1 with its SNMP capable frames The frame acts as an agent when fitted with a CDM xxxx module This module has its own designated slot next to the power supply so as to not affect the number of modules that the frame will take Communication between the NMS the frame and its loaded modules are via this CDM xxxx module Note that the NMS software is third party and not supplied by IRT Electronics Ethernet connection for SNMP operation is via an RJ45 connector on the rear of the frame below the mains inlet Ethernet rate runs at either 10 baseT or 100 baseT Frame parameters such
8. efore 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 equipment is within the warranty period or not Contact IRT for current hourly rate OY A WIS 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 direct as follows Equipment Service IRT Electronics Pty Ltd 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA Phone 61 2 9439 3744 Fax 61 29439 7439 Email service irtelectronics com 4570 mdc ib rev0 doc
9. f switch settings and signal parameters when used in an IRT frame fitted with SNMP capability The MDC 4570 is designed to fit IRT s standard Eurocard frames and may be used alongside any other of IRT s analogue or digital Eurocards Standard features 4570 mdc ib rev0 doc ASI to ASI conversion Reed Solomon encoding amp decoding Interleaving or de interleaving Scrambling or de scrambling Packet length indication 188 to 204 amp 204 to 188 byte conversion where appropriate SNMP capable Page 3 of 14 21 01 2009 Input Type ASI Rate Outputs Type Alarms Major Minor Power Requirements Power consumption Connectors Other Temperature range Mechanical Finish Front escutcheon Rear assembly Dimensions Standard accessories Technical Specifications IRT Eurocard module Type s MDC 4570 1 x ASI 75Q BNC connector or 2 Mb s to 213 Mb s 2 x ASI C 75Q 800 mVp p BNC connector Relay goes open circuit on loss of Sync or power loss Relay goes open circuit when an uncorrectable error occurs or a correctable error if switch SW4 5 is ON or power loss 28 Vac CT 14 0 14 or 16 Vdc 2 5 VA 0 50 C ambient 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 U x 220 mm IRT Eurocard Rear connector assembly including matching connector for alarm output Due to ou
10. ity Reed Solomon Interleaving CAUTION Do not have both switches SW4 1 and SW4 2 ON at the same time TEI b7 of byte after sync byte If set indicates current packet contains uncorrectable RS errors This bit is set by the MDC 4570 if SW4 4 is ON the RS decoder is operating and the current packet has uncorrectible RS errors 4570 mdc ib rev0 doc Page 6 of 14 21 01 2009 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 se
11. m BNC connector Alarm relays Major Alarm Loss of ASI sync and Minor Alarm Uncorrectable Error or Correctable Error with switch SW4 5 ON relay contacts are available on PL8 of the rear assembly Relays go open circuit on alarm condition Both Major and Minor alarms switch to open circuit on power failure 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 4570 mdc ib rev0 doc Page 5 of 14 21 01 2009 Switch settings Configuration The only user settings on the MDC 4570 is on the DIP switch SW4 as shown below SW4 1 ON SW4 1 OFF SW4 2 ON SW4 2 OFF SW4 3 SW4 4 ON SW4 4 OFF SW4 5 ON SW4 5 OFF SW4 6 ON SW4 6 OFF SW4 7 SW4 8 ON SW4 8 OFF 188 to 204 byte conversion enabled 188 to 204 byte conversion disabled 204 to 188 byte conversion enabled 204 to 188 byte conversion disabled Factory use only TEI bit Transport Error Indicator set in outgoing stream if an uncorrectible error is detected TEI bit Transport Error Indicator in outgoing stream is unchanged R S led shows both correctible and uncorrectible errors R S led shows uncorrectible errors only not used not used Factory use only Output SNMP alarms non operational for use with older FRU 4000 frame Output SNMP alarms operational Note that for a 188 byte input signal SW4 1 must be ON for full encoding functional
12. naged devices An NMS is the console through which the network administrator performs network management functions such as monitoring status e g alarm states and remote controlling of a set of managed devices One or more NMSs must exist on any managed network Generally the NMS is a computer running third party SNMP control software There are a number of third party SNMP software applications currently available on the market An NMS polls or communicates with an agent An agent is a network management software module that resides in a managed device An agent has local knowledge of management information and translates that information into a form compatible with SNMP The agent therefore acts as an interface between the NMS and the managed devices The NMS sends a request message and control commands for the managed devices to the agent which in turn sends a response message containing information about the managed devices back to the NMS A managed device contains an SNMP agent and resides on a managed network Managed devices collect and store management information and make this information available to NMSs using SNMP Managed device agent variables are organised in a tree structure known as a Management Information Base MIB Within the MIB are parameters pertaining to the managed device An Object Identifier OID number within the MIB defines the managed device type This is a unique number specific to the model of managed devic
13. of a 15 byte maximum Alias for the input signal An indication of the firmware version of the main FPGA An indication of the software version of the main FPGA Unit Reset Trap Generation Allows enabling of a Trap to be sent when the input is first present or first lost Allows enabling of a Trap to be sent when an RS uncorrectable errored period occurs Allows enabling of a Trap to be sent when an RS correctable errored period occurs Error counters use 31 bit counters Q s 1 A Sync Loss period is a 250ms interval This means that a sync loss or multiple sync losses has occurred in a 250ms time frame To reset counters re enable Reed Solomon error monitoring 4570 mdc ib rev0 doc Page 11 of 14 21 01 2009 SNMP What Is It SNMP stands for Simple Network Management Protocol It is an application layer protocol for managing IP Internet Protocol based systems SNMP enables system administrators to manage system performance and to find and solve system problems SNMP runs over UDP User Datagram Protocol which in turn runs over IP Three types of SNMP exist SNMP version 1 SNMPv1 SNMP version 2 SNMPv2 and SNMP version 3 SNMPv3 It is not the intention here to discuss the differences between various versions only to bring attention to the fact that IRT Electronics modules fitted with SNMP capability use SNMPv1 An SNMP managed network consists of three key components Network Management Systems NMS agents and ma
14. parate manual for selected frame type Input Output amp alarm connections ASI input and ASI outputs are by 75Q BNC connectors on the rear assembly Alarm outputs are by a 4 pin Phoenix style screw connector on the rear assembly Alarms are by FET relay contacts Relays go open circuit on alarm condition Both Major and Minor alarms switch to open circuit on power failure o GND GND MAJOR ALARM MINOR ALARM RUNN The Major Alarm condition is Loss of ASI sync The Minor Alarm condition is Uncorrectable Errors or Correctable Errors with switch SW4 5 set to ON NOTE In order for Minor Alarm to operate need RS decoding ON 4570 mdc ib rev0 doc Page 7 of 14 21 01 2009 Front amp rear panel connector diagrams The following front panel and rear assembly drawings are not to scale and are intended to show connection order and approximate layout only Q MDC 4570 ALARM O P IRT ALARM INPUT INPUT 188 sync 204 SK Spy INS R S SCRAM ASI I P R S SCRAM REED SOLOMON SK 3g OUTS yai ASI O P 1 C LEAVE UP DECODE as ASI O P 2 CENTRE OFF DOWN ENCODE NOT USED DC NOT USED N140 4570 mdc ib rev0 doc Page 8 of 14 21 01 2009 Operation The MDC 4570 primarily operates in either encode or decode mode The three front panel switches determine the coding or decoding operations performed Both outputs contain the same coded information Not all combin
15. r policy of continuing development these specifications are subject to change without notice 4570 mdc ib rev0 doc Page 4 of 14 21 01 2009 Technical Description The MDC 4570 processes an ASI input and outputs two processed ASI C at the input data rate This module is capable of performing scrambling de scrambling RS encoding RS decoding interleaving and de interleaving It can encode as well as decode different MPEG TS formats The module is normally set up as either a decoder or an encoder Certain combinations of functions are inhibited e g de interleaving of a 188 byte transport stream with or without 188 204 conversion enabled The processing functions are selected using three switches interleaving RS coding and scrambling on the front panel Each switch has three positions up centre or down A switch set to the UP position applies processing to the decoding section A switch set to the DOWN position applies processing to the encoding section A switch set to the CENTRE position bypasses the decoding and encoding sections Applying a function to both the decoder and encoder section simultaneously is prevented mechanically by the switch Applying an encoding function on one switch with a decoding function on another switch is an invalid operation Non sensible output may result in this situation ASI Output ASI operates at 270 Mbit s and uses 8B 10B coding with K28 5 stuffing bytes Two ASI cable outputs each use a 75 Oh
16. stments 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 4570 mdc ib rev0 doc Page 2 of 14 21 01 2009 Input 270 Mb s coax ASI C Outputs 270 Mb s coax ASI C ASI C al IRT Eurocard Type MDC 4570 ASI to ASI Network Interface Adapter General Description MDC 4570 Alarms amp Indications 188 BYTE BLOCK 204 BYTE BLOCK SCRAMBLED RS PRESENT INPUT LOSS RS ERROR SYNC ERRORS De Scrambling RS Encode CT The MDC 4570 is an ASI to ASI data transcoder for converting between the commonly used MPEG2 Transport Stream formats in the broadcast industry for video distribution The MDC 4570 can operate at ASI rates from 2 Mb s to the full 213 Mb s rate When set up for encoding it can perform 188 to 204 byte conversion scrambling RS encoding and interleaving When set up for decoding it can perform de interleaving RS correction descrambling and 204 to 188 byte conversion All functionality is switch selectable The MDC 4570 finds particular use in protecting ASI streams when interfacing through various types of links such as microwaves satellite or Telco G 703 links SNMP Simple Network Management Protocol is available for monitoring o
17. thernet Cable IRT SNMP Setup 4570 mdc ib rev0 doc Page 13 of 14 21 01 2009 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 amp Service Equipment is covered by a limited warranty period of three years from date 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 B
18. tor Red This LED lights for 2 seconds when un correctable RS packets are detected These correspond to packets with more than 8 bytes in error This LED will also light up if correctable RS packets are present and SW4 S is set to ON 4570 mdc ib rev0 doc Page 9 of 14 21 01 2009 Processing controls This module is capable of performing scrambling de scrambling RS encoding RS decoding interleaving 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 For a description of the processes involved see Application examples Cable Systems and Technical specifications Characteristics of signal types MPEG 2 transport layer coding The module is normally set up as either a decoder or an encoder Combinations of both functions simultaneously should be avoided The processing functions are selected using three switches interleaving RS coding and scrambling on the front panel Each switch has three positions up centre or scram down SOLOMON A switch set to the UP position applies processing to the decoding section a switch set to the DOWN position applies processing to the encoding section and O INTER a switch set to the CENTRE position does not perform that function to either the LEAVE decoding or encoding
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