Device for transmitting and receiving information signal in multimedia communication system

A device for receiving and transmitting information signal in a multimedia communication system including a transceiver unit for transmitting and receiving the information signal to and from the inside of a room, said device comprising:

• a base unit adapted to be mounted to a wall of the room to detachably support said transceiver unit, said base unit having a receptacle electrically connected to an information transmission line routed within the wall;
• said transceiver unit comprising circuit means for transmitting and receiving the information signal and a housing with a plug and hooks, said plug being electrically connected to said circuit means and projecting on a plug surface defined on said housing to be detachably connected to said receptacle for establishing a signal communication between said circuit means and said information transmission line, said hooks projecting on said plug surface to detachably engage into corresponding grooves formed in said base unit for supporting said transceiver unit to said base unit;
• wherein the present invention is characterized in that:
• said base unit has a receptacle surface in which said receptacle and said grooves exposed;
• a cylindrical wall projects on said receptacle surface to surround said receptacle and said grooves;
• a guide groove is formed in said receptacle surface inside said cylindrical wall and around said receptacle;
• said housing has a columnar stand on which said plug surface is defined, said columnar stand having a diameter slightly smaller than an inner diameter of said cylindrical wall so that said columnar stand can fit within said cylindrical wall when said transceiver unit is attached to said base;
• and that
• said columnar stand has a guide wall projecting on said plug surface in such a configuration that said guide wall is allowed to be inserted into said guide groove only when said guide wall opposes to said guide groove at a particular angular orientation where said plug comes to be connectable with said receptacle.