Design of low-speed cell-based ATM physical layer function

Hun Kang; Kisun Nam; Sungjoon Lim

doi:10.1117/12.201302

17 February 1995 Design of low-speed cell-based ATM physical layer function

Hun Kang, Kisun Nam, Sungjoon Lim

Proceedings Volume 2450, Broadband Networks: Strategies and Technologies; (1995) https://doi.org/10.1117/12.201302
Event: Advanced Networks and Services, 1995, Amsterdam, Netherlands

Abstract

In this paper, low-speed ATM cell-based physical layer function is designed. Unshielded Twisted Pair (UTP) is used for the transmission medium for this function. This is designed to be used in the B-NT2 system that is being developed at Electronics & Telecommunications Research Institute (ETRI) in Korea. Current standardization activities at ITU-T and ATM- Forum for the low-speed ATM transmission are described briefly. The designed function has four units: (1) ATM Cell Transmission Unit (ACTU), (2) Twisted-Pair TRansmission Unit (TPTU), (3) ATM Cell Receive Unit (ACRU), and (4) Twisted-Pair Receive Unit (TPRU). The ACTU receives ATM cells from the ATM Layer Block, generates HEC, idle pattern, sync pattern, and send the ATM cells to the TPTU for transmission. The TPTU receives ATM cells from the ACTU, performs scrambling, 4B/5B encoding, and parallel to serial conversion, and transmits the encoded data over the twisted-pair. The TPRU receives the data through the twisted-pair, recovers the clock, performs word delineation, serial-to-parallel conversion, 4B/5B decoding, and descrambling, and send the data to the ACRU. The ACRU delineates the cell boundary using the sync pattern, checks the HEC, and sends the ATM cells to the ATM Layer Block. When there is no cell to be transmitted, the idle patterns are generated and transmitted. One of the special bytes of the 4B/5B codes is used for the byte alignment and cell delineation. The block diagrams and their functional description are given in detail.

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Hun Kang, Kisun Nam, and Sungjoon Lim "Design of low-speed cell-based ATM physical layer function", Proc. SPIE 2450, Broadband Networks: Strategies and Technologies, (17 February 1995); https://doi.org/10.1117/12.201302

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KEYWORDS

Clocks

Data conversion

Interfaces

Binary data

Receivers

Computer programming

Optical fibers

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