Connection box for glass fiber cables

The invention relates to a connection box (1) for glass fiber cables, comprising an at least two-part housing having a lower part (3) and a cover (2), wherein at least one receptacle (20) for a coupling (30) for accommodating glass fiber connectors is arranged inside the housing, wherein the receptacle (20) is designed as a double frame, which comprises two first vertical bars (21) and two second vertical bars (22), wherein the second bars (22) are arranged closer to a front side (5, 40) of the cover (2) and of the lower part (3), wherein the coupling (30) can be locked either on the first or the second bars (21, 22).