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A terabit electro-optical Clos switch architecture

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1 Author(s)
Liotopoulos, F.K. ; Comput.. Technol. Inst., Athens, Greece

The continuously growing user demands for fast and reliable switching of multi-services calls for the development of high-capacity, scalable core switch architectures. Multi-terabit (Tbps) switches can be effectively developed by combining electrical and optical components and technologies. Switches based on three-stage Clos (1953) networks are very attractive due to their modularity, scalability and fault-tolerance. We present and analyze a modular, multi-Tbps, three-stage Clos switch architecture, based on a two-level hierarchy of optical cross-connects, which can be implemented with arrayed waveguide filters (AWGFs) and optical delay fibers (ODFs). More “intelligent” switch logic, such as resource management functions, call-admission control, congestion and traffic control, routing, cell-header processing, etc. can be more efficiently done in electronics. The capacity of the proposed switch can scale up to 32 Tbps with 8×8 AWGFs and up to half a Pbps with 16×16 AWGFs. The internal cell blocking of the switch, its throughput latency and latency distribution is evaluated by simulation

Published in:

High Performance Switching and Routing, 2001 IEEE Workshop on

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