Functional Structure of the Fiber-Optic Passive Double Star System

Kiyomi KUMOZAKI  Kenji OKADA  

IEICE TRANSACTIONS on Communications   Vol.E75-B   No.9   pp.832-840
Publication Date: 1992/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Fiber-Optic Subscriber Loop)
point to multipoint access,  layered structure,  passive splitter,  activation and deactivation control,  network termination,  

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The essential functions of the passive double star (PDS) system are clarified by comparing them to the functions of the single star (SS) and the active double star (ADS) system. A layered structure describing the functional characteristics of the PDS system is proposed for flexible transport capability. The functions of the optical network unit (ONU) on the customer premises are systematically partitioned into four layers. The functions of the optical subscriber unit (OSU) in the central office are described using five layers. Call by call activation and deactivation techniques are described on the basis of a layered architecture. The reduction of ONU power consumption by adopting activation and deactivation control is also discussed.