An enclosure for housing and fastening a length of optical cable, the optical cable having an outer sheath and a flexible strength member, includes a fixing element and a retention assembly, the fixing element being adapted for engaging a portion of the outer sheath and the retention assembly being adapted for fastening the flexible strength member. The fixing element and the retention assembly are independent from each other. The retention assembly includes a reel and a reel seat. The reel is adapted to receive at least one turn of the flexible strength member wound thereon and to be inserted without rotation into the reel seat. The reel seat is adapted for housing the reel. The reel seat is shaped at least partially mating the shape of the reel.