An opto-electrical transceiver module comprising: a first printed circuit board carrying: - at least one light source with driver circuitry configured to convert incoming electrical signals to optical signals, - at least one optical receiver component with amplifier circuitry configured to convert optical signals to electrical signals, - a single optical coupling unit configured to optically couple waveguides of an optical cable to the at least one light source as well as to the at least one optical receiver component, and - a plurality of first electrical contact pads disposed along a contact edge of the first printed circuit board, the first electrical contact pads being configured to connect to a host device; characterized in that the opto-electrical transceiver module further comprises: a second printed circuit board having a plurality of second electrical contact pads disposed along an edge of the second printed circuit board, the second electrical contact pads being configured to connect to the host device, and a flexible board that connects the at least one second electrical contact pad of the second printed circuit board with the driver circuitry or amplifier circuitry, wherein a conductive path extends from at least one second electrical contact pad on the second printed circuit board to and terminates at one of the driver circuitry and the amplifier circuitry on the first printed circuit board wherein the flexible board is folded to align the first and second printed circuit boards (16, 17), wherein the first and second printed circuit boards' (16, 17) respective contact edges (21, 22) are parallel to each other so as to contact corresponding connections of the host device. a first printed circuit board carrying: - at least one light source with driver circuitry configured to convert incoming electrical signals to optical signals, - at least one optical receiver component with amplifier circuitry configured to convert optical signals to electrical signals, - a single optical coupling unit configured to optically couple waveguides of an optical cable to the at least one light source as well as to the at least one optical receiver component, and - a plurality of first electrical contact pads disposed along a contact edge of the first printed circuit board, the first electrical contact pads being configured to connect to a host device; - at least one light source with driver circuitry configured to convert incoming electrical signals to optical signals, - at least one optical receiver component with amplifier circuitry configured to convert optical signals to electrical signals, - a single optical coupling unit configured to optically couple waveguides of an optical cable to the at least one light source as well as to the at least one optical receiver component, and - a plurality of first electrical contact pads disposed along a contact edge of the first printed circuit board, the first electrical contact pads being configured to connect to a host device; characterized in that the opto-electrical transceiver module further comprises: a second printed circuit board having a plurality of second electrical contact pads disposed along an edge of the second printed circuit board, the second electrical contact pads being configured to connect to the host device, and a flexible board that connects the at least one second electrical contact pad of the second printed circuit board with the driver circuitry or amplifier circuitry, a second printed circuit board having a plurality of second electrical contact pads disposed along an edge of the second printed circuit board, the second electrical contact pads being configured to connect to the host device, and a flexible board that connects the at least one second electrical contact pad of the second printed circuit board with the driver circuitry or amplifier circuitry, wherein a conductive path extends from at least one second electrical contact pad on the second printed circuit board to and terminates at one of the driver circuitry and the amplifier circuitry on the first printed circuit board wherein the flexible board is folded to align the first and second printed circuit boards (16, 17), wherein the first and second printed circuit boards' (16, 17) respective contact edges (21, 22) are parallel to each other so as to contact corresponding connections of the host device.