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Advanced Customer Connections, an Evolutionary System Strategy

Objective

The main objective of the ACCESS project is to define cost effective solutions for a fibre based customer access connection (CAC), mainly for residential customers. This should compete with copper solutions on the basis of services used today, and serve as platform for a subsequent development to serve business customers and evolution towards IBC.
The main objective of the ACCESS project is to define cost effective solutions for a fibre based customer access connection (CAC), mainly for residential customers. This should compete with copper solutions on the basis of services used today, and serve as platform for a subsequent development to serve business customers and evolution towards integrated broadband communications (IBC).
CAC for 622 Mbits{-1} services has resulted in the definition of a flexible CAC able to support services in a future IBC for residential and business customers, definition of an overall demonstrator configuration with the design and evaluation of key optoelectronic components and modules and overall systems evaluations including cost evaluations.
CAC for residential customers has resulted in the definition of a CAC for residential customers based on television (TV) services and telecommunications services transmission technique for TC is amplitude modulat/vestigial siderband (AM/VSB) with the 2 services are transmitted on separate fibres, specification and design of terminal units for TV and telecommunications system, and erbium doped fibre amplifiers (EDFA) for analogue systems and finally technical/economical evaluations.
Technical Approach

The first three years of the project were devoted to definition of a CAC based on digital transmission, capable of carrying 622 Mbit/s services. The main effort during '91 and '92 is devoted to definition and design of a CAC for residential customers with near term service requirements. This is to be based on subcarrier multiplexing (SCM) technique.

The technical approach for the work during 1991 and 1992 is:

- Definition of a low cost CAC for residential customers taking into account performance and cost of components, installation and life cycle cost. Specification, development and evaluation of key components.
- Design of laboratory demonstrators of terminal equipment and EDFAs.
- System evaluations including results from demonstrator design, cost estimations, operation and maintenance requirements, reliability, security and safety issues. Evaluation of upgrading possibilities to IBC.
- Redefinition of the low cost CAC taking into account evaluation results.
- Contribution to standardisation activities.

The work is organised as four sub-projects, ie: consolidation of the technical work including performance, cost and system definitions / evaluations; development of a low cost transceiver for broadband application; system aspects and key technologies for a CAC based on fibre sharing; and evaluation of passive network structures with a shared topology.

Key Issues

- A passive optical network to be cost competitive with copper for residential subscribers demanding POTS and TV services.
- Evaluation of the potentials of using fibre amplifiers for increased sharing of network resources and lowering of cost.
- Evaluation of subcarrier multiplexing technology in comparison with TDM technology.
- Suitable components for passive optical network structures including cables, connectors and distribution boxes.
- Low cost upgradability to broadband services.

Achievements

CAC for 622 Mbit/s services:

- definition of a flexible CAC able to support services in a future IBC for residential and business customers
- definition of an overall demonstrator configuration. Design and evaluation of key opto-electronic components and modules
- overall system evaluations including cost evaluations. CAC for residential customers:
- definition of a CAC for residential customers based on TV services and Telecom services; transmission technique for TV is AM/VSB; the two services are transmitted on separate fibres
- specification and design of terminal units for TV and Telecom system, and EDFA for analogue systems
- technical/economical evaluations.
The work has resulted in 21 published papers so far.

Expected Impact

Opto-electronic components designed by the project are expected to be used in CAC, STM1 and STM4 products. Information gained from development of SDH multiplexers will be applied in commercial products. Connectors and re-enterable mechanical splices started commercial production, during 1991. EDFA modules will be commercially available during 1992.

Results from the work on subcarrier multiplexing has been used in commercial CATV systems introduced in 1991. System design information has been used as input to the specification of local network elements.

Project expertise in mass fusion splicing and wavelength division multiplexing will be used in future developments. A field trial demonstrating the projects concepts will be performed during RACE II.

Coordinator

NKT ELEKTRONIK
Address
Nkt Allee 85
2605 Broendby
Denmark

Participants (11)

AEG Kabel AG
Germany
ANT Nachrichtentechnik GmbH
Germany
Address

71520 Backnang
BRITISH TELECOM PLC (BT)
United Kingdom
France Télécom
France
Address
38-40 Rue Du Général Leclerc
92131 Issy-les-moulineaux
SGS Thomson Microelectronics SA
France
Société Anonyme de Télécommunications (SAT)
France
Souriau et Cie SA
France
TELEFONICA DE ESPANA S.A
Spain
Telefonaktiebolaget L M Ericsson
Sweden
Televerket (Swedish Telecommunications Administration)
Sweden
Thomson Hybrides et Microondes SA
France