The cable management device of a coupling assembly includes a first cable management arm, a second cable management arm, a first component, and a second component. The second cable management arm can be moved with respect to the first cable management arm. The first component is pivotally connected with respect to the first cable management arm. The second component can be displaced to either one of a first position and a second position with respect to the first component. The second component and the first component define a first length when the second component is at the first position. The second component and the first component define a second length different from the first length when the second component is at the second position.