Patent ID: 7039265

Claim:
An apparatus, comprising: a first circuit board removably inserted within a first receptor of a backplane, the first circuit board having a first, second, and third light receivers affixed to its bottom surface, the first light receiver to communicate using a first frequency through air with a first light transmitter disposed on a second circuit board, the first and the second circuit boards being disposed in a backplane; a second circuit board removably inserted within a second receptor of the backplane, the second circuit board having a first and second light transmitters affixed to its top surface, the second circuit board having an aperture therein, and having a fourth and fifth light receivers affixed to its bottom surface, the second transmitter on the second circuit board to communicate using a second frequency through air with the second light receiver disposed on the first circuit board, the first light receiver to reject the second frequency, the second light receiver to reject the first frequency; and a third circuit board removably inserted within a third receptor of the backplane, the third circuit board having a third, fourth, and fifth light transmitters affixed to its top surface, wherein a detected change in transmission intensity of a faulted data signal automatically initiates an orderly shutdown and rerouting of the faulted data signal.