Circuit arrangement for a small PABX with a switching matrix tha

Details Circuit arrangement for a small PABX with a switching matrix tha Circuit arrangement for a small PABX with a switching matrix tha

1984-03-19

1987-01-20

Brown, Thomas W.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379284, 379292, H04M 714, H04Q 352

Patent

active

046381236

ABSTRACT:
In a small PABX with a switching matrix that has electronic crosspoints, integrated selector components comprising multiplexers or demultiplexers in C-MOS technology are used for the switching matrix. By means of individual dialing connection points, which are determined by an appropriate control address supplied by a control computer unit, the individual subscriber lines are to be connected together in internal traffic, and the subscriber lines are to be connected with an exchange line in external traffic. The switching matrix is electrically separated from other operating units by repeating coils in the subscriber lines and in the exchange lines. Central units (tone receiver, tone generator) are connected through free dialing connection points of the multiplexers.

REFERENCES:
patent: 3832495 (1974-08-01), Hovagimyan et al.
patent: 3904831 (1975-09-01), Pommerening et al.
patent: 3993873 (1976-11-01), Bogda et al.
patent: 3993978 (1976-11-01), Hollis
patent: 4113989 (1978-09-01), Schneider
patent: 4236049 (1980-11-01), Tanihata et al.
patent: 4539564 (1985-09-01), Smithson
Article, "Stored Program Controlled PABX, ASB 20", by L. Nyberg, in Ericson Review, vol. 58, (1981), No. 1, pp. 30 to 37.

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