Title: Switching network and peripheral circuits for telecommunications system

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Abstract: Disclosed is a stored program, computer controlled telecommunications system including as its sole switching network an end-marked, multiple stage matrix network with a line side and a supervisory side. Almost all control functions including line scan and rotary dialed digit storage are included in the computer program, this procedure being possible due to the lack of need for any in-network controls. Certain peripheral circuits have appearances on both the line and supervisory side, these including an auxiliary loop usable as an overflow path providing added possibilities for completion of a path through the matrix network. The auxiliary loop is only called in on calls on which a speaking path has been established and on which the original path through the matrix network has been dropped during a change in the nature of a call. Additionally, other peripheral circuits, such as the Voice Frequency Receiver, Transfer Junctors and Attendant's loop, also have appearances on both sides of the matrix network to eliminate the need for additional auxiliary matrices and the need for added access ports. All circuits provided in high quantity, i.e., line circuits, trunks and junctors, have a minimum of access ports and minimal internal function. The network is designed for control of the end-marking from a fixed point on the one side to either a fixed or variable point on the supervisory side by a central processor or computer with the network path completion being directly responsive to the marking of the network ends without in-network controls.


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