SECURITY-DATA.NET

Note: Two critical components are the Service Units and the SpeakerPhone Control units. About half of the electronics required to operate the PicturePhones are in these two boxes. These two boxes were normally hidden in some nearby closet. All components that did not have to be in the Display Unit were placed in the Service and Control units. This was done to reduce the size of the the Display Unit and the amount of heat that the display units gives off... Most PicturePhone Display Units available today were rescued from trash when the service was discontinued. People did not realize that the display units would not work without the Service or the Control units and they were rarely taken or saved. They were packed separately and most people did not know about these units. There are a number of Display Units out there but very few are complete operational systems with full documentation... The Line Balance unit is required to balance the video lines over great distances (i.e. Chicago..