Customer switching systems furnish service to Bell System customers in every business category.
Pulse code modulation (PCM) is used for processing of analog signals for digital transmission.
DEVOTED TO T H E SCIENTIFIC AND ENGINEERING ASPECTS OF ELECTRICAL COMMUNICATION February 1971 1971, American Telephone and Telegraph The Picturephone® System Foreword The first public demonstration
A key telephone system (KTS) is a customer-controlled switching system which permits use of a station set for.
The wideband nature of the facilities for Picturephone service introduces a new degree of complexity in the methods used to maintain lines and trunks.
® Maintenance planning for Picturephone service has proceeded concurrently with the overall planning of equipment and service arrangements.
The introduction of intercity Picturephone service will stimulate growth in the amount of digital information requiring transmission over long distances.
1.1 General1-8 The No.
Service Standards By T. V. C R A T E R (Manuscript received September 25, 1970) We describe in this paper the fundamental requirements of a visual telephone service.
The Picturephone station set1 is one of the most sophisticated items of station equipment ever provided a Bell System customer for switched two-way communications.
