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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Prepare for routine maintenance of broadband cable network
   • Obtain relevant legislation, codes, regulations and standards for given work
   • Determine HFC network elements requiring maintenance and obtain maintenance details from various HFC manufacturer equipment manuals
   • Plan detailed routine maintenance schedule and discuss with all relevant personnel
   • Notify network operations centre (NOC) of proposed maintenance details and maintenance schedule
   • Assess potential impact of proposed maintenance on clients and network, and plan for minimal possible outage or deferral of maintenance
   • Obtain necessary tools and resources, and test equipment to undertake maintenance
   • Ascertain and record recent network stability and network performance
2. Undertake routine HFC network maintenance tasks
   • Conduct routine maintenance tasks according to documented enterprise instructions, following work health and safety (WHS) and environmental requirements, and record results
   • Protect network from excessive interference or degradation of service during maintenance routines
   • Monitor relevant alarms during running of maintenance tasks and report incidences to NOC
   • Escalate unresolved faults according to established enterprise procedure
   • Conduct performance measurements following routine maintenance schedule
3. Analyse results and initiate corrective action
   • Assess outcomes of performance measurements and maintenance routines to ensure they are according to specification
   • Analyse identified problems for likely impact and repair within capability, and initiate or escalate repair action where repair is beyond capability
   • Undertake outage if required in conjunction with NOC and according to prescribed enterprise outage plan
   • Record problems and incidences in maintenance log for future action as required by maintenance agreement
   • Verify alarms to ensure maintenance routines did not generate further problems

Performance Evidence

Evidence of the ability to:

determine the performance of and maintenance requirements for the hybrid fibre coaxial (HFC) broadband cable

prepare a maintenance schedule and planned activities, and arrange resources

carry out maintenance activities following appropriate procedures and techniques

perform radio frequency (RF) and optical measurements and analyse results

administer corrective measures where required, and verify and document actions

comply with site risk control, work health and safety (WHS), environmental, quality and communication requirements.

Note: If a specific volume or frequency is not stated, then evidence must be provided at least once.

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Knowledge Evidence

To complete the unit requirements safely and effectively, the individual must:

define the following terms: 16 QAM, 64 QAM, 256 QAM

explain the relevance of alternating current (AC) and direct current (DC) electrical equipment in HFC broadband cable network

define forward error correction (FEC) and Reed-Solomon Code

explain bit error ratio (BER) and acceptable values

interpret constellation diagrams

describe digital modulation techniques

summarise Data Over Cable Service Interface Specification (DOCSIS) cable modem characteristics

discuss future broadband cable network (BCN) and migration to all-optical cable networks

outline HFC broadband cable network principles, architecture and associated equipment

outline the minimum standards allowable in the return path for ingress

summarise optical fibre characteristics

explain quadrature phase shift keying (QPSK)

summarise the services carried on the HFC broadband cable network

discuss spectrum utilisation of the return path showing location of telephony and data channels, and signalling and test frequencies

explain video stream transport formats including:

digital video broadcasting (DVB) - asynchronous serial interface (ASI)

high definition serial digital interface (HD-SDI)

motion picture experts group 2 (MPEG-2)

standard definition serial digital interface (SD-SDI)

modulation error ratio (MER) and acceptable values

describe the types of amplifier and placement in a HFC broadband cable network

summarise bi-directional RF amplifier and unidirectional RF amplifier

explain eye diagram interpretation

explain frequency spectrum and RF frequency plan HFC broadband cable network

describe the use of passive devices including filter, attenuator, power inserter, coaxial splitter, coupler, multitap and equaliser

outline the calculation of overall gain or loss when given signal levels in dBmv

summarise coaxial transmission line characteristics including cable tilt or slope

summarise forward path from head end to subscriber showing expected signal levels at key points

outline power supply requirements in a HFC broadband cable network

outline the return path from subscriber to head end showing expected signal levels at key points

discuss RF amplifier characteristics including gain and tilt adjustment, equalisation and overload

outline forms of ingress and where they may fall in the return path

describe the set up, operation and interpretation of test equipment for complex tests including:

optical time domain reflectometer (OTDR)

optical power meter

digital signal level meter

RF sweep equipment

spectrum analyser

identify the hand and power tools required to assemble and disassemble equipment in pits and in elevated work situations.

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