Design of communication networks with survivability constraints

Article Abstract:

A new design model for communication networks that addresses the survivability of such networks was developed. Earlier survivable network design models only indirectly facilitated survivability through a connectivity constraint, which requires a preset number of paths between every pair of nodes int he network. In the new design model, survivability was directly addressed in terms of a survivability constraint which indicates the permissible level of lost traffic during a network failure under certain conditions. This analysis demonstrated that a connectivity model is a special type of a survivability model. Moreover, different levels of survivability can be employed for alternative networks that meet the same connectivity constraints. This means that the survivability network design models can incorporate a more varied pool of alternative network topologies than the connectivity models.

Communications Equipment, Telecommunications Equipment, Communications Equipment Manufacturing, Telecommunications systems, Design and construction, Telecommunication systems

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Speeding up the fiber-optic highway

Article Abstract:

Researchers, using microelectricalmechechanical systems, or MEMS, are developing optical switches for fiber optic communications networks. Presently, fiber optic networks use electronic switches, a process that requires the conversion of the signal. Optical switches would increase the network's speed and capacity. Lucent's Bell Labs is developing switches using microscopic mirrors. Corning's switch uses liquid crystal. The Nanovation technology uses microscopically channeled wafers that guide the photons that make up the signal. Industry observers forsee widespread implemention of optical switches over the next 5 years.

United States, Product development, Technology development, Corning Inc., GLW, Fiber optics industry, Fiber transmission equipment, Nanovation

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Into the light

Article Abstract:

Some of the major technology firms are looking into developing all-optical communications networks. Cisco Systems, Nortel Networks and Lucent Technologies Inc. are competing against each other in the field but industry experts suggest the outcome of the market is still unclear.

Laser & Infrared Sys ex Fiber Optic, Research, Computer network equipment industry, Network hardware industry, Cisco Systems Inc., Optical communications technologies, Nortel Networks (Simi Valley, California), Optical communications

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