An apparatus including a socket forming at least one compartment together with a printed circuit board assembly. The compartment including a first side wall, a second side wall, a ceiling, and an opening for receiving one pluggable transceiver, such that when the pluggable transceiver is inserted into the opening, a transceiver contact of the pluggable transceiver is connected to a respective board contact of the printed circuit board assembly. A clamping means is arranged along at least one surface of: the first side wall, the second side wall and the ceiling, to exert a pressure on the pluggable transceiver towards a surface that is opposed the surface on which the clamping means is arranged. The opposed being one of: the second side wall, the first side wall, and the printed circuit board assembly, when the pluggable transceiver is inserted into the opening.