slazhole wrote:I want to use cat5 port that's located in our office in the 4th floor.
Not clear from your post what that cat5 port is connected to. Do you have a central wiring closet with multiple cat5 cables home run to that wiring closet?
Do you also have a coax connection in the office? If so, you can use a MOCA bridge to get an ethernet connection in a room with a coax connection.