Communication Service and Media Control Using ATM

Koso MURAKAMI  Kazuo HAJIKANO  Shunji ABE  Yuji KATO  

IEICE TRANSACTIONS on Communications   Vol.E74-B   No.4   pp.772-779
Publication Date: 1991/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on ATM)

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ATM's bandwidth flexibility and high switching speed advantages have made it the preeminent solution to the B-ISDN. However, networks based on ATM suffer from phenomena not encountered in the STM network, e.g., cell loss, and cell jitter. For ATM to support varied media, problems arising from these phenomena must be resolved. This paper discusses techniques which enable ATM to support CBR, VBR voice, VBR video, and connectionless services. We determine the problems to be resolved for each service and discuss solutions. We focus on dejittering and clock recovery for CBR service, on talk-spurt synchronization for VBR voice, and on video frame synchronization and lost-cell compensation for VBR video service. We show experimental results for a prototype HDTV codec and terminal adapter. For connectionless service, we show that connectionless service should be supplied by the B-ISDN itself using message handlers which support message routing and addressing, i.e., connectionless service functions (CLSF), as described by the CCITT. We propose a network topology of message handlers, which reduces the routing database and avoids transit message handler overload. We show an example of system configuration for connectionless service.