Wireless .sensor networks ( WSN.sJ are being increasingly used in applications where low energy consumption and low cost are the overriding considerations. With increased use, their reliability, availability and serviceability need to be addressed from the outset. Conventional schemes uj' adding redundant nodes and incorporating reliability in control protocols can efectively improve only the reliabiliry of the overall WSN. The availabiliry and serviceability of WSN nodes can be addrevsed by providing the remote testing and repair infrastructure for the individual sensor nodes that is well matched with existing on-board test infrastructure, including standard .JTAG chains. In this paper, we propose and evaluate scalable architectures of WSN nodes for increased availabiliry as well as implement the proposed solutions using COTS components.
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