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[b]NASA plans spacewalk to replace failed router[/b] NASA flight controllers and engineers are laying out a timeline for a contingency spacewalk required to replace a failed backup computer component on the outside of the International Space Station. No date for the spacewalk has been scheduled. Such a spacewalk is one of the so-called "Big 12" that station crews train to execute for the loss of a critical component on the complex. The component, called a multiplexer demultiplexer (MDM) is one of more than a dozen housed on the truss of the station that routes computer commands to various systems on the outpost. The failure Friday to a box called EXT-2, a backup box to a prime component in the S0 truss that measures 10.5 by 14.9 by 16.4 inches and weighs 50.8 pounds, occurred during a routine health check of the device. The prime multiplexer continues to operate flawlessly, and there has been no impact to station operations. The crew was informed of the problem and is in no danger, continuing its normal complement of research work and routine maintenance.
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