Dee, the cables at the front of the bunk just keep that end from crashing down against people/the table/etc. should the latches holding it up in the stowed position ever release. They also help me in raising the bunk back to the stowed position whenever it has been used. With the legs stowed, I pull out on the bunk sharply, then push. The way the back supports are hinged, the back of the bunk moves out and then up when this is done.
Low Pressure, when the bunk is in the stowed position, the front supporting legs are not easily seen. They fold up along the sides of the bunk and are held in place there by Velcro.
When the legs are deployed to support the bunk in front, there is slack in the cables, so they play no part in supporting any occupant. Although, they would act as a "safety" catch should the legs fail for some reason.
- Jack