Abstract: In a circuit assembly of two connectors and a printed circuit board positioned between them, a parasitic reactive coupling is created by the connectors. In the circuitry of the circuit board, a compensating reactive coupling is provided. This is at least partly formed by lengths of conductor path in the board, which lengths are spaced apart with a specific gap over a certain distance along the lengths to give a desired inductive compensating coupling. If required, the compensating reactive coupling also includes capacitors provided by capacitor plates forming parts of different conductor paths on opposite sides of the board.

Abstract: An unshielded telecommunications cable with a nominal characteristic impedance of 100 ohms and a core with a maximum of six pairs of individually insulating conductor wires. The wire insulation is a flame retardant polyolefin base compound and the conductors of each pair are twisted together with a maximum twist lay of 2.3 inches. The core is surrounded by a flame retardant jacket.