Telephone connector
AssigneeJeumont-Schneider Corporation
InventorsRoger G. Velu, Jean A. Picandet, Francois M. Boullier
Life of this patent
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Abstract
A telephone junctor for interconnecting an electromechanical and an electronic automatic exchange, the latter using tone signaling and capable of operating in time-division-multiplex. The junctor permits direct inward dialing of a subscriber on the electromechanical exchange by a subscriber of the electronic exchange.
Claims17
Telephone junctor for the direct inward dialing of a subscriber connected to a first automatic exchange having public network line equipment and extension subscriber equipment by a further subscriber connected to a second, distant automatic exchange capable of transmitting three-frequency signalling towards the said junctor and of interpreting the changes of state of the latter, characterised in that it comprises:
- a generator of single-frequency signaling the signals of which are modulated by "on-off keying,"
- a first terminating set for two wire to four wire conversion connected at the two-wire side to the second exchange and connected at the four-wire side by its first pair of wires to a circuit for receiving three-frequency signaling the signals of which are transmitted by the second exchange, the said receiving circuit controlling relays through intermediary of logic elements, and to the first channel of the four-wire circuit of a second terminating set and, connected by its second pair of wires to the output of a two-input summing amplifier the first input of which is subjected to the single-frequency signaling and the second input of which is connected to the second channel of the four-wire circuit of the second terminating set the two-wire side of which is connected either to the extension subscriber equipment or to the public network line equipment of the first exchange, in accordance with the signaling transmitted by the second exchange,
- an off hook detecting circuit,
- an a.c. source supplying the ringing current, and
- a d.c. source feeding the public network line equipment of the first exchange.
A junctor enabling direct inward dialing to a first, electromechanical exchange, from a second tone signaling automatic exchange comprising:
- a. first and second terminating sets for connecting four-wire circuits to two-wire circuits, each having a first and a second pair of wires on the four wire side thereof,
- b. connecting means for establishing connections between said first and second terminating sets,
- c. said first terminating set receiving on its two-wire circuit an input from said tone signaling automatic exchange,
- d. frequency detecting means receiving tone signals from said first pair of wires of said first terminating set,
- e. logic means receiving signals from said frequency detecting means, and
- f. relay means responsive to said logic means for closing and opening circuit paths responsive to said tone signaling exchange, thereby providing alternative connection to said electromechanical exchange through extension subscriber equipment or through public network line equipment.
Dependencies are inferred from the claim text.