The optical links, the Front End Controller board that carries their support electronics, the Clocking and Control Unit module receiving the signals over the high-speed link and fanning them out to the front- ends have recently become available. In order to establish reliable, noise-free communication with the outside world the control chain has been designed to operate over a ribbon of optical fibers. The CMS Tracker uses complex, programmable embedded electronics for the readout of the Silicon sensors, for the control of the working point of the optical transmitters, for the phase adjustment of the 40 MHz LHC clock and for the monitoring of the voltages, currents and temperatures. The control system for the CMS tracker front-endĭrouhin, F Ljuslin, C Maazouzi, C Marchiero, A Marinelli, N Paillard, C Siegrist, P Tsirou, A L Verdini, P G Walsham, P Zghiche, A