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Elements and Performance Criteria

1. Prepare to diagnose and rectify digital transmission circuits and system faults
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are obtained and applied
2. WHS/OHS risk control measures and workplace procedures are followed in preparation for digital transmission circuits and system work
3. Safety hazards which have not previously been identified are risk assessed, documented and risk control measures devised and implemented in consultation with appropriate person/s
4. Extent of faults is determined from reports, documentation and discussions with appropriate person/s
5. Appropriate person/s is consulted to ensure digital transmission circuits and system work is coordinated effectively with others involved on the worksite
6. Tools, equipment and testing devices needed to diagnose faults are obtained in accordance with workplace procedures and checked for correct operation and safety
7. Diagnose and rectify digital transmission circuits and system faults
   • WHS/OHS risk control measures and workplace procedures for carrying out digital transmission circuits and system work are followed
8. Need to test and measure live work is determined in accordance with WHS/OHS requirements and, as required, conducted in accordance with workplace safety procedures
9. Circuits/machines/plant are checked and isolated in accordance with WHS/OHS requirements and workplace procedures
10. Logical diagnostic methods are applied to diagnose digital transmission apparatus faults using measurements of circuit operating parameters in accordance with apparatus operating specifications
11. Suspected fault scenarios are tested as being the source of digital transmission circuit system problem
12. Faults in the electronic components of the digital transmission apparatus are rectified to circuit and system operation standard
13. Circuits are inspected and tested to verify that digital transmission circuit apparatus operates as intended and to specified requirements
14. Unplanned situations are responded to in accordance with workplace procedures, discussions with appropriate person/s and consistent with job specifications and requirements in a manner that minimises risk to personnel and equipment
15. Diagnosis and rectification activities are carried out efficiently without waste of materials or damage to apparatus, the surrounding environment or services using sustainable energy practices
16. Complete and report fault diagnosis and rectification activities
    • WHS/OHS work completion risk control measures and workplace procedures are followed
17. Worksite is made safe in accordance with workplace safety procedures
18. Rectification of digital transmission circuit and system faults is documented in accordance with workplace procedures
19. Appropriate person/s is notified in accordance with workplace procedures that apparatus faults have been rectified

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Diagnosing and rectifying faults in digital transmission circuits and systems must include at least the following:	two circuit faults in two different types of digital transmission systems

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least one occasion and include:

applying logical diagnostic methods using fault scenarios to test the source of circuit faults identifying the cause faults using logical diagnostic methods rectifying faults effectively verifying that the apparatus operates correctly documenting fault rectification dealing with unplanned events applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, workplace procedures and practices, including using risk control measures applying sustainable energy principles and practices.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

digital television transmission faults, advanced digital television principles, digital television transmission towers and equipment, applying safe working practices and relevant standards, codes and regulations, including: audio component encompassing: audio encoding audio masking audio sub-band encoding Dolby AC-3 MPEG-2 system layer encompassing: PES packet construction time stamps programme clock reference (PCR) transport packet header programme specific information (PSI) channel encoding: forward error correction (FEC) bit error rate (BER) puncturing interleaving modulation: phase shift keying (PSK) quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) coded orthogonal frequency division multiplexing (COFDM) hierarchical modulation: terrestrial channel encoder satellite channel encoder carrier to noise ratio (C/N) single frequency networks: guard interval mega-frames the requirements of digital television terrestrial broadcast (DTTB) program input and monitoring equipment encompassing: basic system arrangement: a central router connected to a number of control rooms terminologies: vertical, multi-level; tie-line routing and cross point typical signal types processed by a router the purpose of redundant central processing units (CPUs) and power supply units common control protocols used in routers typical analogue audio and video output voltage levels present at the router typical specifications for digital data signals present at the router function of various test equipment used in DTTB measurements the operating characteristics of a DTTB transmitter encompassing: typical DTTB digital transmission system safety precautions required when working with high power radio frequency (RF) transmitters operating characteristics of a typical MPEG encoder operation of a COFDM modulator arrangement of sub-system components in a DTTB transmitter purpose of an up converter in a DTTB transmitter typical characteristics of a DTTB power amplifier advantages and disadvantages of air and liquid cooling systems used in transmitters typical DTTB transmitter measurements techniques the performance requirements of the DTTB combiner and antenna systems encompassing: minimum channel separation required between digital and analogue television channels typical specifications of an antenna combiner system the need for combiner systems in DTTB systems typical system faults in combiners and antenna system the requirements of remote monitoring and measurement equipment encompassing: purpose of control panel indicators and controls process by which the system manages a critical failure: power supplies and CPUs different system alarm signals periodic equipment self-tests and diagnostic routines on DTTB systems DTTB systems fault diagnostic and rectification techniques function of the basic components of a DTTB system typical units of a DTTB telemetry system relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures.

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