DocumentCode :
2026354
Title :
Performance evaluation of time switching in TDM wavelength routing networks
Author :
Sivakumar, Mahesh ; Subramahiam, S.
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng.,, Maryland Univ., Baltimore, MD, USA
fYear :
2004
fDate :
25-29 Oct. 2004
Firstpage :
212
Lastpage :
221
Abstract :
Advances in optical WDM technology have paved the way for high-capacity wavelength channels capable of carrying information at Gb/s rates. However, with current traffic streams requiring only a fraction of a wavelength´s bandwidth, it becomes necessary to groom these independent low rate traffic streams on to higher capacity wavelength channels. An all-optical approach to grooming is to allow many connections to time-share a wavelength. Accordingly, in a TDM wavelength routing network, the establishment of a connection requires the assignment of time slots in addition to routing and wavelength assignment. One of the primary challenges in such networks is the need for quick reconfiguration at the routing nodes. In this paper, we investigate the effects of switch reconfigurability, wavelength conversion and time slot interchangers (TSIs) on the blocking performance of connections with multiple rates. Heuristics for time slot assignment that consider constraints imposed by six different node architectures are proposed, and the blocking performance of the TDM wavelength routing network is evaluated through simulations. Results indicate that limited reconfigurability at the nodes is sufficient to attain the performance obtained with full reconfigurability, especially when connections occupy only a small fraction of the wavelength capacity. Furthermore, the blocking performance is not seen to benefit significantly with the introduction of wavelength converters and TSIs, thus signifying that the improvement in blocking is largely dependent on the switch reconfigurability at the nodes.
Keywords :
optical fibre networks; telecommunication channels; telecommunication network routing; time division multiplexing; wavelength division multiplexing; TDM wavelength routing network; high-capacity wavelength channel; time division multiplexing; time slot interchanger; time switching; wavelength assignment; wavelength converter; Bandwidth; Intelligent networks; Optical buffering; Optical fiber networks; Optical wavelength conversion; Switches; Telecommunication traffic; Time division multiplexing; Wavelength division multiplexing; Wavelength routing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Broadband Networks, 2004. BroadNets 2004. Proceedings. First International Conference on
Print_ISBN :
0-7695-2221-1
Type :
conf
DOI :
10.1109/BROADNETS.2004.9
Filename :
1363806
Link To Document :
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