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Switch Matrix for Intraprimary Switch Connections

IP.com Disclosure Number: IPCOM000094638D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Fox, JE: AUTHOR

Abstract

A primary switch matrix of a four-wire crosspoint telephone switching system is shown. N lines in the primary switch connect to secondary switches, not shown, via 2N-1 links. The secondary switch provides connections to other primary switch matrices in the remainder of the system. For simplicity, each line drawn labeled S (send) or R (receive) actually represents two wires giving a total of four wires for each telephone line, i. e., two represented by S and two represented by R. To set up a telephone conversation between any two subscribers, the S wires of one subscriber must be connected to the R wires of the other and vice versa. Interprimary switch connections are set up in the usual manner.

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Switch Matrix for Intraprimary Switch Connections

A primary switch matrix of a four-wire crosspoint telephone switching system is shown. N lines in the primary switch connect to secondary switches, not shown, via 2N-1 links. The secondary switch provides connections to other primary switch matrices in the remainder of the system. For simplicity, each line drawn labeled S (send) or R (receive) actually represents two wires giving a total of four wires for each telephone line, i. e., two represented by S and two represented by R. To set up a telephone conversation between any two subscribers, the S wires of one subscriber must be connected to the R wires of the other and vice versa. Interprimary switch connections are set up in the usual manner. Intraprimary switch connections are established and the proper send- receive relationships are maintained between subscribers by utilizing N-1 paired links.

The connections between the paired links are established by closing a pair of crosspoints such as 14 and 15. For example, intraprimary switch connections between a subscriber assigned to line 2 and a subscriber assigned to line 4 are established by closing cross points 16 and 17, by closing crosspoints 14 and 15 between links 6 and 7, and finally by closing crosspoints 18 and 19. The heavy lines trace the path of the telephone conversation between lines 2 and 4 through these closed crosspoints. The proper send and receive relationships are maintained. The send wires of...