A No. 4 Electronic Switching System was installed in Chicago to provide toll service between metropolitan Chicago and selected area codes in the United States.
System Objectives and Organization By A. E. RITCHIE and L. S. TUOMENOKSA (Manuscript received February 8, 1977) This article is an introduction to a series of articles that describe the No.
System Power By H. J. LUER and R. OSTAPIAK (Manuscript received July 26, 1976) The No. 4 ESS system is powered from a 140-volt battery plant.
The selection of a digital format for the No. 4 ESS switch represents a significant step in the continuing evolution of the intertoll network in the United States.
The nature of No. 4 ESS, together with evolving equipment concepts, has resulted in a streamlined switching/transmission interface with 1057 Fig. 1--Transmission/switching interface system.
The No. 1 ESS master control center (MCC) serves as the interface between the switching system and operating telephone company personnel.
The switching network is a major functional unit in a telephone central office, representing in many cases 50 per cent or more of the equipment in the office.
This article presents the topology, traffic properties and control of the switching network for No. 1 ESS.
l.i General The continuing expansion of present-day services, the demand for additional types of service, and the anticipation of new service offerings in the future all indicate a need for a new g
A comparison of X-ray photoemission from Ag and Pd clusters grown on amorphous carbon substrates highlights the importance of the unfilled 4d band in Pd clusters.
