Abstract
A Picturephone® network will take maximum advantage of existing telephone equipment. To provide service, a new videotelephone set will be added to a Touch-Tone® telephone installation. Video access lines (loops) to the serving central office will be provided using additional regular wire pairs, appropriately equalized. Arrangements are being provided for extending PBX and key telephone customer switching arrangements to have a Picturephone capability. Central office switching will be accomplished by auxiliary video switches under the control of ordinary switching machines. Short-haul trunks will be provided on ordinary trunk cables equipped with equalizers as for loops. Long-haul trunks will make use of existing and planned systems, with additional equipment needed only at the terminals. The network was designed primarily for face-to-face communications, but two additional services are being offered at the outset: data communications at 460.8 kb/s and interfacing arrangements for access to a customer's computer. Other new services are in the offing.
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