Private automatic branch exchange having two exchange units

Details Private automatic branch exchange having two exchange units Private automatic branch exchange having two exchange units

1977-04-18

1979-01-23

Cooper, William C.

179 18AH, H04M 700

Patent

active

041362640

ABSTRACT:
A private automatic branch exchange (PABX) system having first and second exchange units each including a marker and a switch frame wherein the connection between a central office called trunk belonging to the first exchange unit and a subscriber belonging to the first exchange unit is made through the switch frame of the first exchange unit by activating only the marker of the first exchange unit from a position circuit, and the connection between the central office called trunk and a subscriber belonging to the second exchange unit is made through the switch frame of the first exchange unit, an interunit trunk and the switch frame of the second exchange unit by sequentially activating the marker of the first exchange unit and the marker of the second exchange unit from the position circuit.

REFERENCES:
patent: 3264415 (1966-08-01), Burns et al.

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