Abstract: The receiver processing circuitry performs the steps of an iterative process and in each step derives from a received signal Iin a threshold value related to a characteristic of the signal. This value is stored via an analog-to-digital convertor AD in a memory MEM. The characteristic of the signal Iin is then compared in a comparator consisting of two comparator circuits C1 and C2 and a switch S, with a threshold value stored previously for the substation which sent Iin. This value is prior to receipt of Iin, i.e. during a previous timeslot, applied to, e.g., C1 via a digital-to-analog convertor DA1. During this comparison a threshold stored for the substation which is next to transmit a signal is retrieved from MEM via a digital-to-analog convertor DA2. The result of the comparison is via S generated at Dout and represents the digital conversion of Iin. The power of the transmitted signals is controlled by a circuit included in the transmitters of the system.

Abstract: A structure for optically coupling at least one optical conductor to an optical input or output of an optical device includes a carrier, having the optical conductor embedded therein such that the optical conductor has at least one locally bent portion reaching an outer surface of the carrier and forming there at least one optical contact point to which the optical input or output of the device may be coupled. Conductor positioning structure is provided disposed in the carrier, for accurately positioning the conductor in the carrier. Cooperating positioning structure, disposed on the carrier at the surface reached by the bent portion of the conductor, co-operates with corresponding complimentary positioning structure of the optical device.

Abstract: A circuit board assembly includes a circuit board with an optical fiber embedded in a flexible layer of the board. The flexible layer is detachable whereby it may be bent out of the board via an opening in an upper layer thereof to allow coupling of the fiber with an input/output device, e.g., another fiber. In an alternative embodiment the flexible layer extends beyond the edges of the board.