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Dual-hop LANs using a wavelength routing cross...
Journal article

Dual-hop LANs using a wavelength routing cross connect

Abstract

The use of wavelength-division-multiplexing (WDM) may dramatically increase the traffic capacity in future local and metropolitan area networks. However, because of device limitations, the number of available wavelengths may initially be less than desired. As a result, spatial reuse may be required in order to obtain designs which will support a reasonable number of stations. There are several ways in which this may be accomplished (Matsumoto, 1993; Janoska and Todd, 1994; Kannan et al., 1994).In (Matsumoto, 1993), a LAN design was considered where media access is performed across a spatial wavelength cross connect. Although the traffic capacity may be much higher than in conventional LANs, many operational aspects in this type of system are much more complex. In this paper, we investigate the use of a dual-hop architecture as a way of simplifying the operation of such a system. The network consists of two stages. In the first, the wavelength agility of the user stations is used to route packets from a given local optical network (LON) to a destination LON. When packets arrive at a destination LON, they are buffered and transmitted onto the required destination wavelength. There are a number of advantages to this design including the elimination of protocols which would require both dynamic station transmitter and receiver tunability. This design also takes advantage of increasingly available commercial ATM buffer/switch components. Several hybrid electro-optic options are considered. In addition to the electronic buffering versions, we also show that the LON buffering stage could be implemented using the almost all-optical approaches discussed in (Haas, 1993; Tsukada et al., 1994; Hunter et al., 1994; Thompson and Giordano, 1987; Gabriagues et al., 1994). Simplified control strategies are proposed and wavelength sharing is used to decrease the number of required buffers. The performance of the system is compared with others using various traffic models.

Authors

Ahmadvand N; Todd TD

Journal

Computer networks and ISDN systems, Vol. 29, No. 16, pp. 1901–1917

Publisher

Elsevier

Publication Date

December 15, 1997

DOI

10.1016/s0169-7552(97)00106-2

ISSN

0169-7552
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