A communications card provides an electronic interface between a host computer and a transmission media line. The communications card includes a releasable adaptor which interconnects an electrical connector of the transmission media line to the communications card when in use. The adaptor also integrates into the overall configuration of the communication card in a storage position to present a configuration that conforms with PCMCIA communication card architecture. The adaptor releasably attaches to the communication card when in the storage position. The releasable connection between the communication card and the adaptor allows replacement of the adaptor when worn or damages, without replacing the entire communications card. And the integral storage position of the adaptor allows a user to internally carry the adaptor with the communications card within the host computer.