An apparatus includes an array of electro-optical transducers, control circuitry, and a connector housing. The electro-optical transducers are configured to convert between electrical signals and respective optical signals conveyed over respective optical fibers. The control circuitry is configured, in response to a failure of a first electro-optical transducer in the array that is associated with a given optical fiber, to switch one or more of the electrical signals and the optical signals so as to replace the first electro-optical transducer with a second electro-optical transducer in the array in conveying an optical signal over the given optical fiber. The connector housing contains the array of the electro-optical transducers and the control circuitry.