of the connector through an opening in the lower backshell fig2 5 illustrate cable terminating connector 12 in greater detail as shown in fig2 and 3 lower backshell 42 includes a pair of identical slots 51 extending thereinto from substantially opposite sides of the top side face 52 thereof as shown in fig2 slots 51 have a generally t shaped configuration when viewed from the top side and include an enlarged first slot portion 54 and a second slot portion 56 of reduced size slot portion 54 is both wider and deeper than slot portion 56 as shown in fig3 and slot portion 56 extends from slot portion 54 to the front end face 57 of lower backshell 42 when viewed from the front end 57 as shown in fig3 the slot portions 54 and 56 are of generally rectangular shape the side walls of the slot portions 54 and 56 however include first upper side wall portions 54a and 56a respectively which are tapered inwardly from top surface 52 and second lower side wall portions 54b and 56b respectively which are substantially parallel each slot 51 is adapted to receive a key 61 as illustrated in fig5 key 61 includes a body section 62 and a keying section 63 body section 62 is adapted to extend into and be received within a slot 51 and includes an enlarged first body portion 62a and a second body portion 62b of reduced size keying section 63 is of generally.