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Question 2/15 - Optical systems for access networks

(Continuation of Question 2/15)

Background and justification

Recommendations G.983.1 and G.983.2, which were completed in the 1997-2000 study period have allowed telecommunications manufacturers to develop B-PON based, inter-operable access equipment. Practical experience with the design and network deployment of B-PON equipment will necessitate revision of these Recommendations. In particular, there is a need to enhance these Recommendations in order to accommodate a variety of services and Internet Protocol (IP) traffic in an efficient manner. This could include increases in capacity to extend into the Gigabit/s range.

The use of new technologies such as wavelength division multiplexers, arrayed wave-guide filters, optical amplifiers, or new system approaches such as hybrid fibre-radio (HFR) systems in the access network, will necessitate the development of new Recommendations in these areas.

Demand for fibre access will be driven by factors such as: the ability to carry interactive and broadcast services (residential video, HDTV), managed bandwidth to multiple ISPs, longer reach, higher quality of service. Solutions are required for a wide range of market segments and situations including: business, small-to-medium-enterprise, small-office-home-office, residential, green field, and rehabilitation.

Solutions should be related in a timely way to service requirements.


  • What enhancements to existing Recommendations are needed to enable legacy or other services on a B-PON access network; e.g. residential video or telephony?
  • What modifications to existing or new Recommendations need to be developed to allow higher levels of service capability; e.g. DWDM?
  • What new Recommendations need to be developed to allow systems to evolve to much higher split ratios physically and logically?
  • What enhancements or new Recommendations need to be developed to meet new capacity/bandwidth allocation requirements?
  • What enhancements or new Recommendations need to be developed to enable resilience requirements to be achieved in the fibre access network; e.g. dual cards, VP protection, switchover procedures, alternative paths or drop transmission media?
  • What enhancements to existing Recommendations need to be defined to improve interoperability?
  • What new Recommendations need to be developed to meet new fibre access or fibre-hybrid system requirements?
  • >
  • What new Recommendations are needed to meet new requirements for greater distances in the access network?

Study items

Study items to be considered include:

  • How to improve Recommendations to enable new vendor or operator specific requirements to be added; e.g. management systems support of Ethernet, IP, new alarms or additional attributes to existing managed entities
  • How to meet future requirements for capacity in optical access systems e.g. Gigabit/s capacity systems
  • Impact of new component technology on optical access networks
  • Increasing service capability
  • Improving protocol efficiency
  • Improved survivability

Specific tasks

Maintenance and enhancements of Recommendations in the G.983 series with regard to capacity, interoperability, new MAC/TC layers, management and control interfaces, survivability, spectral management, split ratios or other requirements (2002)


Other relevant Questions of SG 15 on optical systems and transmission equipment management

  • ITU-T SG 4 on management aspects
  • ITU-T SG 6 on hybrid fibre/copper networks
  • ITU-T SG 9 on television and sound transmission
  • ITU-T SG 13 on access network architecture and ATM layer characteristics
  • ITU-R SG 9 on radio-frequency transport over optical fibres on fixed wireless loop
  • IEC TC86 and its sub-committees on system test methods
  • ATM Forum
  • IETF
  • IEEE 802.3


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Updated : 2004-10-21