A telecommunications module comprises a termination strip (1) having two rows of contacts (13) along a first side (9) of the strip and two rows of contacts along an opposed second side (10) of the strip, and a mounting mechanism (15) at each end of the strip by which the strip is removably-mounted on a carrier (3) with a selected one of the first and second sides (9, 10) accessible for making connections to contacts on that side. At least one of the mounting mechanisms (15) is engageable in an opening (11A, 46) in the carrier whereby the strip can be mounted on the carrier in one orientation only with the first side (9) accessible, and in only one orientation with the second side (10) accessible.